SINGLE MODE OPTICAL FIBER OPTIMIZED TO OPERATE IN O AND E BAND, AND CORRESPONDING OPTICAL TRANSMISSION SYSTEM

Abstract

A single-mode optical fiber including a core having a refractive index n, wherein the core comprises a region in which the value of n decreases from a value n.sub.0, to a value n.sub.2; and a cladding having a first layer of cladding in which the refractive index is n.sub.2; and a second layer of cladding in which the refractive index is n.sub.3, lower than n.sub.2; a third layer of cladding in which the refractive index is n.sub.4, higher than n.sub.3;
in which the core radius r.sub.1 is comprised between 2.5 m and 5.5 m; and
in which a refractive-index difference n.sub.0=n.sub.0n.sub.4 is higher than 5.810.sup.3; and
in which a refractive-index difference n.sub.2=n.sub.2n.sub.4 is between 110.sup.3 and 2.510.sup.3; and in which
a refractive-index difference n.sub.3=n.sub.3n.sub.4 is lower than 0.

Claims

1. A single-mode optical fiber comprising: a core having a refractive index n, wherein the core comprises a region in which the value of n decreases from a value n.sub.0 at a radius r.sub.0, to a value n.sub.2 at a radius r.sub.1; and a cladding having a refractive index n, said cladding comprising: a first layer of cladding wherein the refractive index n is equal to n.sub.2; and a second layer of cladding wherein the refractive index n is equal to a value n.sub.3 lower than n.sub.2; a third layer of cladding wherein the refractive index n is equal to a value n.sub.4 higher than n.sub.3; wherein the core radius r.sub.1 is comprised between 2.5 m and 5.5 m; and wherein a refractive-index difference n.sub.0=n.sub.0n.sub.4 is higher than 5.810.sup.3; and wherein a refractive-index difference n.sub.2=n.sub.2n.sub.4 is between 110.sup.3 and 2.510.sup.3; and wherein a refractive-index difference n.sub.3=n.sub.3n.sub.4 is lower than 0; and wherein the refractive-index profile of the core and cladding is defined by the following profile parameters: $K_1=V_{11}-5.85V_{01}$ $K_2=V_{02}+0.65V_{01}$ $K_3=V_{03}-5K_2$ where V.sub.01 is a surface integral of the core; V.sub.11 is a volume integral of the core; V.sub.02 is a surface integral of the first layer of cladding; V.sub.03 is a surface integral of the second layer of cladding; and wherein said parameters respect the following inequalities: $-59<K_1<-47$ $18<K_2<24$ $-133<K_3<-118.$

2. The single-mode optical fiber according to claim 1, wherein the third layer of cladding is composed of silica.

3. The single-mode optical fiber according to claim 1, wherein the profile of the refractive index of the core is trapezoidal, with a ratio comprised between 0 and 1, and preferably between 0.05 and 0.95, wherein said ratio is equal to r.sub.0/r.sub.1.

4. The single-mode optical fiber according to claim 1, wherein the profile of the refractive index or the core presents rounded edges.

5. The single-mode optical fiber according to claim 1, wherein the profile of the refractive index of the core presents an inner central depressed zone, from the center of the core to the radius r.sub.0, wherein r.sub.0 is lower than r.sub.0, and wherein the refractive index n of the core, presents a minimum value at the center of the core equal to n.sub.0D, wherein n.sub.0D is lower than n.sub.0.

6. The single-mode optical fiber according to claim 1, wherein the region with decrease of refractive index is obtained by gradually changing a concentration of at least two dopants.

7. The single-mode optical fiber according to claim 1, wherein the at least two dopants are chosen among the following elements and/or molecules: germanium oxide (GeO.sub.2); fluorine (F); phosphorus oxide (P.sub.XO.sub.Y); boron oxide (B.sub.XO.sub.Y); 1 aluminum oxide (Al.sub.2O.sub.3).

8. The single-mode optical fiber according to claim 1, wherein said optical fiber has a Chromatic Dispersion comprised between 9 and +3 ps/(nm.Math.km) in the range of wavelength from 1268 to 1375 nm.

9. The single-mode optical fiber according to claim 1, wherein said optical fiber has a Mode Field Diameter (MFD) at a 1310 nm wavelength which is comprised between 8.6 and 9.2 m.

10. The single-mode optical fiber according to claim 1, wherein said optical fiber has a Cable cut-off wavelength comprised between 1170 nm and 1260 nm.

11. The single-mode optical fiber according to claim 1, wherein said optical fiber has a Zero Dispersion Wavelength comprised between 1340 and 1360 nm.

12. An optical fiber transmission system wherein it comprises at least one single-mode optical fiber according to claim 1.

13. The optical fiber transmission system according to claim 12, wherein said transmission system has a maximum Transmitter Dispersion Penalty of 1.5 dB.

Description

BRIEF DESCRIPTION OF THE FIGURES

[0039] The present disclosure can be better understood with reference to the following description and drawings, given by way of example and not limiting the scope of protection, and in which:

[0040] FIG. 1 depicts an optical fiber according to the invention;

[0041] FIG. 2 depicts a diagrammatic representation of the evolution of the refractive index (a) of the core and cladding of an optical fiber according to FIG. 1, according to a first example of invention, together with a sectional view (b) of such optical fiber;

[0042] FIG. 3 depicts a diagrammatic representation of the evolution of the refractive index of the core and cladding of an optical fiber according to FIG. 3, according to a second example of the invention, the refractive index profile of the core comprising rounded edges;

[0043] FIG. 4 depicts a diagrammatic representation of the evolution of the refractive index of the core and cladding of an optical fiber according to FIG. 3, according to a third example of the invention, the refractive index profile of the core comprising a depressed central zone;

[0044] FIG. 5 depicts a diagrammatic representation of the evolution of the refractive index of the core and cladding of an optical fiber according to FIG. 3, according to a fourth example of the invention, the refractive index profile of the core comprising a depressed central zone, and rounded edges;

[0045] FIG. 6 depicts a diagrammatic representation of a transmission system comprising an optical fiber according to the invention.

[0046] The components in the figures are not necessarily to scale, emphasis instead being placed upon illustrating the principles of the invention.

DETAILED DESCRIPTION

[0047] The general principle of the invention relies on a single-mode optical fiber configured to be implemented in optical transmission systems operating in a range of wavelengths comprised between 1260 nm and 1625 nm. More particularly, the invention relies on a single-mode optical fiber optimized to be used in the highest wavelengths of the O-band and even in the E-band (for example, around 1375 nm). Indeed, the specific characteristics of the single-mode optical fiber according to the invention allow to obtain a Chromatic Dispersion (CD) slightly shifted in comparison to the G.652 and G.657 fibers but presenting the same optical performances. More particularly, the single-mode optical fiber according to the invention presents a ZDW comprised between 1340 and 1360 nm, allowing to maintain the Chromatic Dispersion (CD) between 9 and +3 ps/(nm.Math.km) in the range from 1268 to 1375 nm. Such ZDW and all other optical parameters are obtained thanks to specific characteristics of the different elements composing the fiber. Furthermore, as for G.652 and G.657 fibers, the optical fiber according to the invention has a Mode Field Diameter (MFD) at a 1310 nm wavelength which is comprised between 8.6 and 9.2 m and preferably at 9 m. The optical fiber also has a Cable cut-off wavelength comprised between 1170 nm and 1260 nm. Thus, this optical fiber presents similar characteristics to the G.652 and G.657 fibers, but is further optimized for a use in the high O-band wavelengths.

[0048] As illustrated in [FIG. 1], the optical fiber 1 according to the invention comprises a core 10 which is the inner light-carrying member of the fiber, and a cladding 20 which serves to confine the light to the core. The cladding comprises three layers of cladding: a first layer of cladding 21 also referred to as an intermediate cladding, a second layer of cladding 22 also referred to as a trench, and a third layer of cladding 23 also referred to as external cladding.

[0049] The core 10 is defined by a radius r and a refractive index n varying with radius r, while the cladding is defined be a radius r and a refractive index n varying with radius r. More particularly, [FIG. 2] represents the index profile of an optical fiber on the above graph (a) and a sectional view of this optical fiber in the part below (b), according to the invention. In the part (a) of this figure is represented the evolution of the refractive index (n, n) of the core 10 and cladding 20 in function of the radius (r, r) from the center of the core 10.

[0050] According to the invention, the core 10 is defined with an external radius r.sub.1. The core 10 comprises a first region, from its center (r=0) to a radius r.sub.0. In the embodiment illustrated in [FIG. 2], the first region of the core presents a constant refractive index equal to no. The optical core 10 further comprises a second region, from radius r.sub.0 to radius r.sub.1, with a decreasing refractive index, and with a refractive index n.sub.2 at radius r.sub.1. In the embodiment illustrated in [FIG. 2], the index of the core in the second region decreases from no to n.sub.2. Furthermore, in the exemplary embodiment of [FIG. 2], the radiuses and indices of the core are defined as follow:

[00003]$0.180\mathrm{.Math.m}{r}_{0}3\mathrm{.Math.m}$$2.5\mathrm{.Math.m}{r}_{1}5.5\mathrm{.Math.m}$$r_0{r}_1$ [0051] n.sub.0>0.0058 with n.sub.0 being the refractive index difference between the first region of the core and the third layer of cladding: n.sub.0=n.sub.0n.sub.4 [0052] 110.sup.3n.sub.22.510.sup.3 with n.sub.2 being the difference between the index at r.sub.1 (in the outer part of the second region of the core) and the index of the third layer of cladding: n.sub.2=n.sub.2n.sub.4

[0053] More particularly, according to a particular embodiment of the invention, n.sub.0 is comprised between 0.0058 and 0.0085.

[0054] In addition, the radiuses parameters of the core 10 can further be defined as follows: 0r.sub.0r.sub.1 with the ratio between the radius of the first region and the second region of the cladding being defined as follows: ratio=r.sub.0/r.sub.1, with 0ratio1, and preferably, 0.05ratio0.95.

[0055] Thus, the core 10 also presents a radius equivalent r.sub.eq defined as follows:

r.sub.eq=r.sub.1(1+ratio)/2, with 1.5 mr.sub.eq3.5 m

[0056] Furthermore, the profile of the refractive index of the core 10 can be trapezoidal or rectangular, with edges which can be rounded or not.

[0057] The values of index and radius contribute to obtaining a single-mode optical fiber optimized for operating in the high wavelengths of the O-band. Indeed, the core radius of the single-mode optical fiber according to the invention is smaller than the prior art's ones, which allow to obtain a ZDW around 1350 nm.

[0058] The surface integral of the core 10 can be expressed by the following formula:

[00004]$V_{01}={}_0^{r_1}n\left(r\right).Math.\mathrm{dr}\frac{r_1}{2}.Math.\left[n_0.Math.\left(1+\mathrm{ratio}\right)+n_2.Math.\left(1-\mathrm{ratio}\right)\right]$

[0059] In this formula, the index deltas (n.sub.0, n.sub.2) are multiplied by 1000, the unit of r.sub.1 is the m, and therefore, the unit of V.sub.01 is the m.

[0060] In a particular embodiment of the invention: 16 mV.sub.0125 m.

[0061] And the volume integral of the core 10 can be expressed by the following formula:

[00005]$V_{11}=2.Math.{}_0^{r_1}n\left(r\right).Math.r.Math.\mathrm{dr}\frac{r_1^2}{3}.Math.\left[n_0.Math.\left(1+\mathrm{ratio}+{\mathrm{ratio}}^2\right)+n_2.Math.\left(2-\mathrm{ratio}-{\mathrm{ratio}}^2\right)\right]$

[0062] In this formula, the index deltas (n.sub.0, n.sub.2) are multiplied by 1000, the unit of r.sub.1 is the m, and therefore, the unit of V.sub.11 is the m.sup.2.

[0063] In a particular embodiment of the invention: 42 m.sup.2V.sub.1193 m.sup.2.

[0064] The first layer of cladding 21 or intermediate cladding is defined with a radius r.sub.2 and a constant refractive index equal to n.sub.2.

[0065] According to an embodiment of the invention, the radius of the first layer of cladding 21 is preferably defined as follows: 7.8 mr.sub.29 m.

[0066] The surface integral of the first layer of cladding 21 can be expressed by the following formula:

[00006]$V_{02}={}_{r_1}^{r_2}n\left(r\right).Math.\mathrm{dr}\left(r_2-r_1\right).Math.n_2$

[0067] In this formula, the index delta n.sub.2 is multiplied by 1000, the unit of r.sub.1 and r.sub.2 is the m, and therefore, the unit of V.sub.02 is the m.

[0068] In a particular embodiment of the invention: 3 mV.sub.0212 m.

[0069] The volume integral of the first layer of cladding 21 can be expressed by the following formula:

[00007]$V_{12}=2.Math.{}_{r_1}^{r_2}n\left(r\right).Math.r.Math.\mathrm{dr}\left(r_2^2-r_1^2\right).Math.n_2$

[0070] In this formula, the index delta n.sub.2 is multiplied by 1000, the unit of r.sub.1 and r.sub.2 is the m, and therefore, the unit of V.sub.12 is the m.sup.2.

[0071] In a particular embodiment of the invention: 50 m.sup.2V.sub.12130 m.sup.2.

[0072] The second layer of cladding 22 or trench is defined with a radius r.sub.3 and a constant refractive index n.sub.3, the index of the second layer of cladding being defined as follows: n.sub.30, with n.sub.3 being the refractive-index difference between the second layer of cladding 22 and the third layer of cladding 23: n.sub.3=n.sub.3n.sub.4 Furthermore, according to a particular embodiment of the invention, the radius of the second layer of cladding 22 is preferably defined as follows: 10.8 mr.sub.313.2 m.

[0073] The surface integral of the second layer of cladding 22 can be expressed by the following formula:

[00008]$V_{03}={}_{r_2}^{r_3}n\left(r\right).Math.\mathrm{dr}\left(r_3-r_2\right).Math.n_3$

[0074] In this formula, the index delta n.sub.3 is multiplied by 1000, the unit of r.sub.2 and r.sub.3 is the m, and therefore, the unit of V.sub.03 is the m.

[0075] In a particular embodiment of the invention: 30 mV.sub.0314 m.

[0076] The volume integral of the second layer of cladding 22 can be expressed by the following formula:

[00009]$V_{13}=2.Math.{}_{r_2}^{r_3}n\left(r\right).Math.r.Math.\mathrm{dr}\left(r_3^2-r_2^2\right).Math.n_3$

[0077] In this formula, the index delta n.sub.3 is multiplied by 1000, the unit of r.sub.2 and r.sub.3 is the m, and therefore, the unit of V.sub.13 is the m.sup.2.

[0078] In a particular embodiment of the invention: 653 m.sup.2V.sub.13272 m.sup.2.

[0079] Thus, the single-mode optical fiber 1 according to the invention requires a trench assisted design with a lower refractive index compared to the second layer of cladding, to reach the targeted performances, i.e. a ZDW comprised between 1340 and 1360 nm and a shifted CD and the same other parameters as G.652 and G.657 fibers.

[0080] Finally, the third layer of cladding 23 or external cladding is defined with a constant refractive index n.sub.4 which respects the following inequality: n.sub.4n.sub.3.

[0081] This third layer of cladding 23 participates in creating a trench in the second layer of cladding 22, and to protect the inner layers of cladding 20 and the core 10.

[0082] The third layer of cladding 23 is preferably composed of almost pure silica, and preferably pure silica.

[0083] Hereinafter are described specific embodiments of the invention. More particularly, the invention can present specific refractive-index profiles which are described in relation with [FIG. 2], [FIG. 3], [FIG. 4] and [FIG. 5], which are not limiting examples.

[0084] According to the invention, the refractive-index profile of the core 10 and the cladding 20 of the optical fiber 1 are described in relation with profile parameters (K.sub.1, K.sub.2, K.sub.3), which are defined as follows:

[00010]$K_1=V_{11}-5.85V_{01}$$K_2=V_{02}+0.65V_{01}$$K_3=V_{03}-5K_2$

[0085] In these formulas, the unit of V.sub.01, V.sub.02 and V.sub.03 is the m, while the unit of V.sub.11 is the m.sup.2. Therefore, the formula of K.sub.1 can also be expressed: K.sub.1=V.sub.115.85 (m)V.sub.01.

[0086] These profile parameters respect the following inequalities:

[00011]$-59<K_1<-47$$18<K_2<24$$-133<K_3<-118$

[0087] Thus, these profile parameters allow to better define the refractive-index profile of the optical fiber 1, and also allow to determine the limits of these profiles. Among the profiles defined by these profile parameters are angular profiles with a rectangular or trapezoidal shape, as illustrated by [FIG. 2], rounded profiles with a global rectangular or trapezoidal shape, as illustrated by [FIG. 3], and also profiles comprising a core with an inner central depressed zone 11 with either angular of rounded edges, as illustrated by [FIG. 4] and [FIG. 5].

[0088] Thus, as illustrated by [FIG. 3] the index profile of the core 10 can be rounded. In such a case, the first region of the core, with a radius r.sub.0, ends exactly at the beginning of the refractive-index decrease, i.e. before the rounded part of the profile.

[0089] The cladding 20 of the optical fiber 1 can also present a profile with rounded edged. Such embodiment is not represented in the figures.

[0090] FIG. 4 represents another embodiment of the invention, in which the index profile of the core 10 comprises an inner central depressed zone 11, in the first region of the core. This figure represents an angular profile.

[0091] More particularly, as illustrated in [FIG. 4], this inner central depressed zone 11 extends from the center of the core (r=0) to a radius r.sub.0, with r.sub.0<r.sub.0. In this inner central depressed zone 11, the refractive index n of the core, presents a minimum value at the center of the core equal to n.sub.0D, with n.sub.0D<n.sub.0, or in other words, n.sub.0D<n.sub.0 with n.sub.0D=n.sub.0Dn.sub.4.

[0092] FIG. 5 represents another embodiment of the invention, in which the index profile of the core (10) is rounded and comprises an inner central depressed zone (11). Thus, all the profile of the core (10), with the inner central depressed zone (11), can present rounded edges. In this case, the inner central depressed zone (11), with a radius r.sub.D, ends when the maximum value (n.sub.0, or n.sub.0) of the core refractive index (n) is reached. In the embodiment represented in [FIG. 5], r.sub.D=r.sub.0 because the maximum value of n or n (which is n.sub.0, or n.sub.0) is only met at a unique point on the graph.

[0093] In an embodiment of the invention, the second region of the core from radius r.sub.0 to radius r.sub.1, with decrease of refractive index can be obtained by gradually changing a concentration of at least two dopants, which can be chosen among the following elements and/or molecules: [0094] germanium oxide (GeO.sub.2); [0095] fluorine (F); [0096] phosphorus oxide (P.sub.XO.sub.Y); [0097] boron oxide (B.sub.XO.sub.Y); [0098] aluminum oxide (Al.sub.2O.sub.3).

[0099] The modification of the refractive index of the other elements of the optical fiber 1 (other parts of the core 10, and the cladding 20) can also be obtained via a change in concentration of dopants in these different elements. More particularly, in an embodiment of the invention, the core 10 and the cladding 20 of the optical fiber 1 are both composed of silica, and the change in refractive index is obtained via the change in dopant concentration.

[0100] In a preferred embodiment, the impact of the inner central depressed zone 11 on V.sub.11 should not induce a V.sub.11 reduction of more than 1103 m.sup.2, even more preferably 0.5103 m.sup.2. [Table 2] below presents examples for an inner central depressed zone 11 presenting a fixed n.sub.0D.

TABLE-US-00002 TABLE 2 r.sub.D = 1 m n.sub.0D n.sub.0 1 10.sup.3, and more preferably n.sub.0D n.sub.0 0.5 10.sup.3 r.sub.D = 0.5 m n.sub.0D n.sub.0 4 10.sup.3, and more preferably n.sub.0D n.sub.0 2 10.sup.3 r.sub.D = 0.25 m n.sub.0D n.sub.0 16 10.sup.3, and more preferably n.sub.0D n.sub.0 8 10.sup.3

[0101] The invention also relates to an optical fiber transmission system comprising an optical fiber 1 with the characteristics described previously. Preferentially, such system is a MDWDM system comprising a transmitter and a receiver, respectively comprising a multiplexer and a demultiplexer.

[0102] As an example, [FIG. 6] represents a MDWM system comprising an optical fiber 1, transmitters Tx, receivers

[0103] Rx, and optical multiplexers (OM) and demultiplexers (OD). The optical multiplexer and demultiplexer allow respectively to multiplex or concentrate several optical signals at one end of the system (.sub.1, . . . .sub.N and .sub.1, . . . .sub.M) and to demultiplex or separate these signals at the other end of the system, in one direction of in the other. Thus, the signal propagated in the single-mode optical fiber 1 of the invention is a multiplexed signal (a combination of several signals).

[0104] Optionally, such system can comprise repeaters (100-1, . . . , 100-n) if the system transmits over long distances. The repeaters can comprise one or more filters, and/or one or more amplifiers 101, and/or one or more dispersion compensating fibers 102, etc.

[0105] By using the optical fiber of the invention, the range of wavelength which can be used by the optical fiber transmission system is wider than the ones available for the optical communication system of the prior art. In fact, it can operate in the O- and E-wavelength bands (from 1268 to 1375 nm) using, for example, Metro Wave Division Multiplexing (MWDM) with a 25 Gb/s transceiver.

[0106] Furthermore, the Transmitter Dispersion Penalty of such an optical fiber transmission system is lower than 1.5 dB, or even lower than 0.5 dB.

[0107] Theoretical examples of parameters, which can be used for obtaining a single-mode optical fiber 1 according to the invention, are presented in the tables hereinafter. [Table 3] to [Table 14] present 94 examples of sets of parameters (Ex1 to Ex94).

[0108] More particularly, [Table 3] lists 30 examples (Ex1 to Ex30), each comprising different parameters of ratios (r.sub.0/r.sub.1), radiuses (r.sub.0, r.sub.1, r.sub.2, r.sub.3), and refractive-index differences with the third layer of cladding (n.sub.0, n.sub.2, n.sub.3).

TABLE-US-00003 TABLE 3 No Ratio r.sub.0 r.sub.1 r.sub.eq r.sub.2 r.sub.3 n.sub.0 n.sub.2 n.sub.3 (Units) (m) (m) (m) (m) (m) (1000) (1000) (1000) Ex1 0.05 0.185 3.7 1.9425 7.83 10.88 8.42 2.18 4.77 Ex2 0.2 0.730 3.65 2.19 7.83 10.88 7.58 2.18 4.77 Ex3 0.35 1.222 3.49 2.35575 7.83 10.88 7.04 2.2 4.77 Ex4 0.5 1.635 3.27 2.4525 7.83 10.88 6.73 2.23 4.77 Ex5 0.75 2.168 2.89 2.52875 7.83 10.88 6.49 2.25 4.77 Ex6 0.95 2.480 2.61 2.54475 7.83 10.88 6.43 2.26 4.77 Ex7 0.05 0.200 3.99 2.09475 8.27 10.88 8.18 1.94 6.27 Ex8 0.2 0.784 3.92 2.352 8.27 10.88 7.35 1.95 6.27 Ex9 0.35 1.309 3.74 2.5245 8.27 10.88 6.82 1.97 6.27 Ex10 0.5 1.745 3.49 2.6175 8.27 10.88 6.51 2 6.27 Ex11 0.75 2.303 3.07 2.68625 8.27 10.88 6.28 2.03 6.27 Ex12 0.95 2.632 2.77 2.70075 8.27 10.88 6.23 2.03 6.27 Ex13 0.05 0.212 4.24 2.226 8.7 10.88 8 1.72 8.39 Ex14 0.2 0.832 4.16 2.496 8.7 10.88 7.17 1.74 8.39 Ex15 0.35 1.383 3.95 2.66625 8.7 10.88 6.65 1.77 8.39 Ex16 0.5 1.840 3.68 2.76 8.7 10.88 6.35 1.81 8.39 Ex17 0.75 2.423 3.23 2.82625 8.7 10.88 6.13 1.83 8.39 Ex18 0.95 2.765 2.91 2.83725 8.7 10.88 6.07 1.84 8.39 Ex19 0.05 0.188 3.76 1.974 7.83 11.96 8.28 2.04 4.35 Ex20 0.2 0.740 3.7 2.22 7.83 11.96 7.44 2.05 4.35 Ex21 0.35 1.239 3.54 2.3895 7.83 11.96 6.91 2.07 4.35 Ex22 0.5 1.655 3.31 2.4825 7.83 11.96 6.59 2.09 4.35 Ex23 0.75 2.198 2.93 2.56375 7.83 11.96 6.34 2.11 4.35 Ex24 0.95 2.508 2.64 2.574 7.83 11.96 6.29 2.11 4.35 Ex25 0.05 0.201 4.01 2.10525 8.27 11.96 8.06 1.81 5.74 Ex26 0.2 0.788 3.94 2.364 8.27 11.96 7.23 1.82 5.74 Ex27 0.35 1.313 3.75 2.53125 8.27 11.96 6.7 1.85 5.74 Ex28 0.5 1.755 3.51 2.6325 8.27 11.96 6.4 1.87 5.74 Ex29 0.75 2.310 3.08 2.695 8.27 11.96 6.16 1.89 5.74 Ex30 0.95 2.641 2.78 2.7105 8.27 11.96 6.11 1.9 5.74

[0109] [Table 4] refers to the same 30 examples of [Table 3] and represents the subsequent surface integrals and volume integrals of the core and layers of cladding (V.sub.01, V.sub.11, V.sub.02, V.sub.12, V.sub.03, V.sub.13). The profile parameters K.sub.1, K.sub.2 and K.sub.3 are also listed in this table.

TABLE-US-00004 TABLE 4 No V.sub.01 V.sub.11 K.sub.1 V.sub.02 K.sub.2 V.sub.12 V.sub.03 V.sub.13 K.sub.3 (Units) (m) (m.sup.2) (m.sup.2) (m) (m) (m.sup.2) (m) (m.sup.2) (m) Ex1 20.2 59.8 58.3 9.0 22.1 103.8 14.5 272.2 125.2 Ex2 19.8 58.8 57.0 9.1 22.0 104.6 14.5 272.2 124.4 Ex3 19.1 55.7 55.9 9.5 21.9 108.1 14.5 272.2 124.3 Ex4 18.3 51.9 55.3 10.2 22.1 112.9 14.5 272.2 125.0 Ex5 17.2 46.1 54.7 11.1 22.3 119.2 14.5 272.2 126.1 Ex6 16.5 42.4 54.2 11.8 22.5 123.2 14.5 272.2 127.2 Ex7 20.8 65.7 56.0 8.3 21.8 101.8 16.4 313.4 125.5 Ex8 20.3 64.3 54.8 8.5 21.7 103.4 16.4 313.4 124.9 Ex9 19.6 60.9 53.9 8.9 21.7 107.2 16.4 313.4 124.7 Ex10 18.8 56.4 53.5 9.6 21.8 112.4 16.4 313.4 125.2 Ex11 17.6 50.0 53.2 10.6 22.0 119.7 16.4 313.4 126.5 Ex12 17.0 46.2 53.0 11.2 22.2 123.3 16.4 313.4 127.3 Ex13 21.3 70.5 53.9 7.7 21.5 99.3 18.3 358.1 125.8 Ex14 20.8 69.0 52.7 7.9 21.4 101.6 18.3 358.1 125.4 Ex15 20.0 65.0 52.0 8.4 21.4 106.4 18.3 358.1 125.3 Ex16 19.2 60.4 51.9 9.1 21.6 112.5 18.3 358.1 126.1 Ex17 18.1 53.7 52.0 10.0 21.8 119.4 18.3 358.1 127.0 Ex18 17.4 49.6 51.9 10.7 21.9 123.7 18.3 358.1 128.0 Ex19 20.0 59.8 57.1 8.3 21.3 96.2 18.0 355.5 124.4 Ex20 19.6 58.6 55.8 8.5 21.2 97.6 18.0 355.5 123.8 Ex21 18.9 55.7 54.8 8.9 21.2 101.0 18.0 355.5 123.8 Ex22 18.1 51.7 54.2 9.4 21.2 105.2 18.0 355.5 124.0 Ex23 17.0 46.1 53.5 10.3 21.4 111.2 18.0 355.5 125.0 Ex24 16.3 42.4 53.1 11.0 21.6 114.7 18.0 355.5 125.8 Ex25 20.4 64.4 55.1 7.7 21.0 94.7 21.2 428.5 126.1 Ex26 20.0 63.0 53.8 7.9 20.9 96.2 21.2 428.5 125.5 Ex27 19.2 59.5 52.9 8.4 20.9 100.5 21.2 428.5 125.4 Ex28 18.5 55.6 52.6 8.9 20.9 104.9 21.2 428.5 125.8 Ex29 17.3 49.2 52.2 9.8 21.1 111.3 21.2 428.5 126.5 Ex30 16.7 45.6 52.0 10.4 21.3 115.3 21.2 428.5 127.6

[0110] [Table 5] refers to the same 30 examples of [Table 3] and represents the corresponding Zero Dispersion Wavelength (ZDW), Zero Dispersion Shift (ZDS), Chromatic Dispersion (CD) at 1267.5 nm, at 1310 nm, and at 1374.5 nm, the Mode Filed Diameter (MFD) at 1310 nm and at 1550 nm, and the cable cutoff wavelength.

TABLE-US-00005 TABLE 5 CD CD CD MFD MFD Cable No ZDW ZDS 1267.5 1310 1374.5 1310 1550 Cutoff (Units) (nm) (ps/(nm.sup.2 .Math. km)) (ps/(nm .Math. km)) (ps/(nm .Math. km)) (ps/(nm .Math. km)) (m) (m) (nm) Ex1 1350 0.097 8.9 4.1 2.4 9.00 10.33 1212 Ex2 1350 0.096 8.9 4.1 2.4 9.00 10.33 1211 Ex3 1350 0.096 8.8 4.1 2.3 9.00 10.33 1211 Ex4 1350 0.096 8.8 4.1 2.4 9.00 10.34 1212 Ex5 1350 0.096 8.8 4.1 2.3 9.00 10.33 1214 Ex6 1350 0.096 8.7 4.1 2.4 9.00 10.34 1214 Ex7 1350 0.096 8.8 4.1 2.4 9.00 10.34 1209 Ex8 1350 0.096 8.8 4.1 2.3 9.00 10.34 1209 Ex9 1350 0.096 8.8 4.1 2.3 9.00 10.34 1209 Ex10 1350 0.095 8.7 4.1 2.3 9.00 10.35 1210 Ex11 1350 0.095 8.7 4 2.3 9.01 10.35 1210 Ex12 1350 0.095 8.7 4.1 2.3 9.00 10.35 1210 Ex13 1350 0.095 8.7 4.1 2.3 9.00 10.34 1209 Ex14 1350 0.095 8.7 4.1 2.3 9.00 10.34 1209 Ex15 1350 0.095 8.7 4 2.3 9.00 10.34 1209 Ex16 1350 0.095 8.6 4 2.3 9.01 10.35 1209 Ex17 1350 0.094 8.6 4 2.3 8.99 10.34 1209 Ex18 1350 0.094 8.6 4 2.3 9.00 10.35 1209 Ex19 1350 0.097 8.9 4.1 2.4 9.00 10.33 1210 Ex20 1350 0.097 8.8 4.1 2.4 9.00 10.34 1210 Ex21 1350 0.096 8.8 4.1 2.3 8.99 10.33 1210 Ex22 1350 0.096 8.8 4.1 2.4 9.00 10.34 1210 Ex23 1350 0.096 8.7 4 2.4 9.00 10.34 1208 Ex24 1350 0.096 8.8 4.1 2.3 9.00 10.34 1209 Ex25 1350 0.097 8.8 4.1 2.4 9.00 10.34 1213 Ex26 1350 0.096 8.8 4.1 2.4 9.00 10.34 1212 Ex27 1350 0.096 8.8 4.1 2.4 9.01 10.34 1213 Ex28 1350 0.096 8.7 4.1 2.3 9.00 10.33 1213 Ex29 1350 0.096 8.7 4.1 2.3 9.00 10.34 1212 Ex30 1350 0.095 8.7 4.1 2.3 9.00 10.34 1212

[0111] [Table 6] refers to the same 30 examples of [Table 3] and represents the corresponding bend losses (R7.5BL, R10BL and R15BL) for either 1 or 10 turns, measured at different wavelengths (1550 m and 1625 m), and for different radiuses (7.5 mm, 10 mm, and 15 mm).

TABLE-US-00006 TABLE 6 R15BL R10BL R7.5BL R15BL R10BL R7.5BL No at 1550 at 1550 at 1550 at 1625 at 1625 at 1625 (Units) (dB/10turn) (dB/turn) (dB/turn) (dB/10turn) (dB/turn) (dB/turn) BL Type Ex1 0.034 0.16 0.92 0.184 0.47 1.94 A1 Ex2 0.035 0.16 0.93 0.189 0.48 1.96 A1 Ex3 0.035 0.17 0.94 0.191 0.48 1.97 A1 Ex4 0.036 0.17 0.95 0.194 0.49 1.99 A1 Ex5 0.035 0.17 0.95 0.192 0.48 1.99 A1 Ex6 0.036 0.17 0.95 0.193 0.49 2 A1 Ex7 0.035 0.16 0.84 0.189 0.45 1.75 A1 Ex8 0.036 0.16 0.85 0.191 0.45 1.76 A1 Ex9 0.037 0.16 0.86 0.196 0.46 1.79 A1 Ex10 0.037 0.16 0.87 0.198 0.46 1.81 A1 Ex11 0.039 0.17 0.9 0.207 0.48 1.85 A1 Ex12 0.04 0.17 0.9 0.21 0.48 1.86 A1 Ex13 0.035 0.14 0.75 0.184 0.41 1.56 A1 Ex14 0.036 0.15 0.76 0.188 0.42 1.57 A1 Ex15 0.037 0.15 0.78 0.192 0.42 1.6 A1 Ex16 0.038 0.15 0.8 0.199 0.43 1.63 A1 Ex17 0.041 0.16 0.83 0.213 0.45 1.69 A1 Ex18 0.042 0.16 0.84 0.217 0.46 1.71 A1 Ex19 0.043 0.15 0.7 0.218 0.41 1.42 A1 Ex20 0.042 0.15 0.7 0.217 0.41 1.42 A1 Ex21 0.043 0.15 0.7 0.219 0.41 1.43 A1 Ex22 0.045 0.15 0.72 0.228 0.42 1.46 A1 Ex23 0.048 0.16 0.75 0.244 0.44 1.52 A1 Ex24 0.048 0.16 0.75 0.245 0.44 1.51 A1 Ex25 0.043 0.13 0.57 0.213 0.35 1.15 A1 Ex26 0.043 0.13 0.58 0.217 0.36 1.16 A1 Ex27 0.043 0.13 0.58 0.217 0.36 1.17 A1 Ex28 0.045 0.13 0.59 0.223 0.37 1.19 A1 Ex29 0.049 0.14 0.62 0.241 0.38 1.24 A1 Ex30 0.05 0.14 0.63 0.247 0.39 1.25 A1

[0112] [Table 7], [Table 8] and [Table 9] represent 30 more examples (Ex31 to Ex60), listing the same parameters as respectively [Table 3], [Table 4], [Table 5] and [Table 6].

TABLE-US-00007 TABLE 7 No r.sub.0 r.sub.1 r.sub.eq r.sub.2 r.sub.3 n.sub.0 n.sub.2 n.sub.3 (Units) Ratio (m) (m) (m) (m) (m) (1000) (1000) (1000) Ex31 0.05 0.212 4.24 2.226 8.7 11.96 7.89 1.59 7.58 Ex32 0.2 0.832 4.16 2.496 8.7 11.96 7.05 1.6 7.58 Ex33 0.35 1.383 3.95 2.66625 8.7 11.96 6.54 1.65 7.58 Ex34 0.5 1.840 3.68 2.76 8.7 11.96 6.24 1.68 7.58 Ex35 0.75 2.423 3.23 2.82625 8.7 11.96 6 1.7 7.58 Ex36 0.95 2.765 2.91 2.83725 8.7 11.96 5.95 1.7 7.58 Ex37 0.05 0.194 3.87 2.03175 7.83 13.05 8.11 1.9 3.95 Ex38 0.2 0.762 3.81 2.286 7.83 13.05 7.27 1.9 3.95 Ex39 0.35 1.274 3.64 2.457 7.83 13.05 6.76 1.94 3.95 Ex40 0.5 1.700 3.4 2.55 7.83 13.05 6.45 1.97 3.95 Ex41 0.75 2.250 3 2.625 7.83 13.05 6.21 1.98 3.95 Ex42 0.95 2.575 2.71 2.64225 7.83 13.05 6.15 1.99 3.95 Ex43 0.05 0.204 4.08 2.142 8.27 13.05 7.95 1.7 5.25 Ex44 0.2 0.804 4.02 2.412 8.27 13.05 7.12 1.71 5.25 Ex45 0.35 1.337 3.82 2.5785 8.27 13.05 6.6 1.74 5.25 Ex46 0.5 1.780 3.56 2.67 8.27 13.05 6.29 1.77 5.25 Ex47 0.75 2.348 3.13 2.73875 8.27 13.05 6.06 1.79 5.25 Ex48 0.95 2.689 2.83 2.75925 8.27 13.05 6 1.79 5.25 Ex49 0.05 0.215 4.3 2.2575 8.7 13.05 7.78 1.48 6.9 Ex50 0.2 0.844 4.22 2.532 8.7 13.05 6.95 1.5 6.9 Ex51 0.35 1.400 4 2.7 8.7 13.05 6.44 1.54 6.9 Ex52 0.5 1.860 3.72 2.79 8.7 13.05 6.14 1.57 6.9 Ex53 0.75 2.445 3.26 2.8525 8.7 13.05 5.91 1.6 6.9 Ex54 0.95 2.793 2.94 2.8665 8.7 13.05 5.86 1.61 6.9 Ex55 0.45 1.481 3.29 2.38525 8.27 13.05 6.54 1.95 5.25 Ex56 0.25 0.908 3.63 2.26875 8.27 13.05 7.18 1.86 5.25 Ex57 0.4 1.352 3.38 2.366 7.83 13.05 6.54 1.93 3.95 Ex58 0.7 2.072 2.96 2.516 7.83 11.96 6.55 2.28 4.35 Ex59 0.15 0.593 3.95 2.27125 8.27 10.88 7.73 2.05 6.27 Ex60 0.1 0.390 3.9 2.145 7.83 10.88 7.92 2.19 4.77

TABLE-US-00008 TABLE 8 No V.sub.01 V.sub.11 K.sub.1 V.sub.02 K.sub.2 V.sub.12 V.sub.03 V.sub.13 K.sub.3 (Units) (m) (m.sup.2) (m.sup.2) (m) (m) (m.sup.2) (m) (m.sup.2) (m) Ex31 20.8 68.3 53.2 7.1 20.6 91.8 24.7 510.5 127.7 Ex32 20.3 66.7 51.8 7.3 20.4 93.4 24.7 510.5 126.9 Ex33 19.6 63.2 51.2 7.8 20.5 99.1 24.7 510.5 127.5 Ex34 18.8 58.8 51.0 8.4 20.6 104.4 24.7 510.5 127.9 Ex35 17.6 52.3 50.9 9.3 20.8 110.9 24.7 510.5 128.5 Ex36 17.0 48.6 50.9 9.8 20.9 114.3 24.7 510.5 129.2 Ex37 20.0 61.1 55.7 7.5 20.5 88.0 20.6 430.5 123.1 Ex38 19.5 59.8 54.4 7.6 20.3 88.9 20.6 430.5 122.2 Ex39 18.9 57.1 53.5 8.1 20.4 93.2 20.6 430.5 122.7 Ex40 18.1 53.0 53.0 8.7 20.5 98.0 20.6 430.5 123.2 Ex41 17.0 47.2 52.5 9.6 20.6 103.6 20.6 430.5 123.8 Ex42 16.4 43.7 52.2 10.2 20.8 107.4 20.6 430.5 124.8 Ex43 20.3 64.8 54.1 7.1 20.3 88.0 25.1 535.0 126.8 Ex44 19.9 63.8 52.8 7.3 20.2 89.3 25.1 535.0 126.2 Ex45 19.2 60.2 52.0 7.7 20.2 93.6 25.1 535.0 126.1 Ex46 18.4 55.8 51.6 8.3 20.3 98.6 25.1 535.0 126.5 Ex47 17.3 49.8 51.4 9.2 20.4 104.9 25.1 535.0 127.3 Ex48 16.7 46.4 51.2 9.7 20.6 108.1 25.1 535.0 128.0 Ex49 20.6 68.2 52.2 6.5 19.9 84.7 30.0 652.8 129.5 Ex50 20.1 66.8 50.9 6.7 19.8 86.8 30.0 652.8 129.0 Ex51 19.4 63.1 50.3 7.2 19.8 91.9 30.0 652.8 129.2 Ex52 18.6 58.6 50.1 7.8 19.9 97.1 30.0 652.8 129.5 Ex53 17.5 52.3 50.1 8.7 20.1 104.1 30.0 652.8 130.4 Ex54 16.9 48.8 50.1 9.3 20.3 107.9 30.0 652.8 131.4 Ex55 17.4 48.5 53.1 9.7 21.0 112.3 25.1 535.0 130.1 Ex56 18.8 55.2 54.9 8.6 20.9 102.7 25.1 535.0 129.4 Ex57 17.4 49.4 52.5 8.6 19.9 96.3 20.6 430.5 120.2 Ex58 17.5 47.3 55.0 11.1 22.5 119.8 18.0 355.5 130.3 Ex59 21.0 66.6 56.2 8.9 22.5 108.2 16.4 313.4 128.9 Ex60 20.8 65.6 56.3 8.6 22.1 101.0 14.5 272.2 125.3

TABLE-US-00009 TABLE 9 CD CD CD MFD MFD Cable No ZDW ZDS 1267.5 1310 1374.5 1310 1550 Cutoff (Units) (nm) (ps/(nm.sup.2 .Math. km)) (ps/(nm .Math. km)) (ps/(nm .Math. km)) (ps/(nm .Math. km)) (m) (m) (nm) Ex31 1350 0.096 8.8 4.1 2.3 8.99 10.33 1216 Ex32 1350 0.096 8.7 4.1 2.3 9.00 10.33 1215 Ex33 1350 0.096 8.7 4 2.3 9.00 10.34 1219 Ex34 1350 0.095 8.6 4 2.3 9.00 10.34 1218 Ex35 1350 0.095 8.6 4 2.3 9.00 10.35 1215 Ex36 1350 0.095 8.6 4 2.3 9.00 10.34 1215 Ex37 1350 0.096 8.8 4.1 2.4 9.00 10.34 1214 Ex38 1350 0.096 8.8 4.1 2.4 9.00 10.34 1213 Ex39 1350 0.096 8.8 4.1 2.3 9.00 10.34 1218 Ex40 1350 0.096 8.7 4 2.4 9.00 10.35 1219 Ex41 1350 0.095 8.7 4 2.3 9.00 10.34 1217 Ex42 1350 0.095 8.7 4 2.4 9.00 10.35 1216 Ex43 1350 0.096 8.8 4.1 2.3 9.00 10.34 1214 Ex44 1350 0.096 8.8 4.1 2.3 9.00 10.34 1215 Ex45 1350 0.096 8.7 4.1 2.3 9.00 10.34 1218 Ex46 1350 0.095 8.7 4 2.3 9.01 10.35 1213 Ex47 1350 0.095 8.7 4 2.3 9.00 10.35 1214 Ex48 1350 0.095 8.6 4 2.3 9.00 10.34 1214 Ex49 1350 0.096 8.7 4.1 2.3 9.00 10.34 1205 Ex50 1350 0.096 8.7 4 2.3 9.00 10.34 1205 Ex51 1350 0.095 8.7 4 2.3 9.00 10.34 1207 Ex52 1350 0.095 8.6 4 2.3 9.00 10.34 1206 Ex53 1350 0.095 8.6 4 2.3 9.00 10.35 1206 Ex54 1350 0.095 8.6 4 2.3 9.00 10.35 1206 Ex55 1352 0.098 9.3 4.4 2.2 9.18 10.58 1221 Ex56 1356 0.097 9.5 4.7 1.8 9.03 10.43 1215 Ex57 1350 0.097 8.8 4.1 2.4 9.15 10.52 1186 Ex58 1350 0.096 8.8 4.1 2.4 9.01 10.35 1245 Ex59 1351 0.096 8.9 4.2 2.3 8.98 10.31 1237 Ex60 1345 0.096 8.3 3.6 2.8 9.04 10.33 1229

TABLE-US-00010 TABLE 10 R15BL R10BL R7.5BL R15BL R10BL R7.5BL No at 1550 at 1550 at 1550 at 1625 at 1625 at 1625 (Units) (dB/10turn) (dB/turn) (dB/turn) (dB/10turn) (dB/turn) (dB/turn) BL Type Ex31 0.04 0.11 0.46 0.197 0.29 0.91 A1 Ex32 0.041 0.11 0.46 0.203 0.3 0.93 A1 Ex33 0.039 0.11 0.46 0.194 0.29 0.92 A1 Ex34 0.043 0.11 0.48 0.21 0.31 0.95 A1 Ex35 0.048 0.12 0.5 0.232 0.33 1 A1 Ex36 0.049 0.12 0.51 0.236 0.33 1.01 A1 Ex37 0.046 0.12 0.51 0.224 0.33 1.02 A1 Ex38 0.047 0.12 0.51 0.229 0.33 1.03 A1 Ex39 0.043 0.12 0.5 0.213 0.32 1.01 A1 Ex40 0.044 0.12 0.51 0.219 0.33 1.02 A1 Ex41 0.048 0.13 0.52 0.236 0.34 1.05 A1 Ex42 0.049 0.13 0.53 0.241 0.35 1.07 A1 Ex43 0.036 0.09 0.34 0.177 0.24 0.69 A1 Ex44 0.036 0.09 0.34 0.177 0.24 0.69 A1 Ex45 0.037 0.09 0.35 0.18 0.24 0.7 A1 Ex46 0.04 0.09 0.36 0.192 0.25 0.72 A1 Ex47 0.042 0.1 0.37 0.202 0.26 0.74 A1 Ex48 0.043 0.1 0.37 0.206 0.26 0.74 A1 Ex49 0.031 0.07 0.24 0.151 0.18 0.48 A1 Ex50 0.031 0.07 0.24 0.151 0.18 0.48 A1 Ex51 0.032 0.07 0.24 0.152 0.18 0.49 A1 Ex52 0.034 0.07 0.25 0.163 0.19 0.51 A1 Ex53 0.037 0.07 0.26 0.173 0.19 0.52 A1 Ex54 0.037 0.07 0.26 0.176 0.19 0.52 A1 Ex55 0.071 0.13 0.48 0.310 0.34 0.92 A1 Ex56 0.052 0.11 0.42 0.241 0.29 0.82 A1 Ex57 0.150 0.24 0.83 0.636 0.59 1.57 A1 Ex58 0.018 0.09 0.51 0.101 0.27 1.09 A1 Ex59 0.015 0.09 0.60 0.089 0.28 1.31 A1 Ex60 0.018 0.11 0.71 0.106 0.33 1.55 A1

[0113] Finally, [Table 11], [Table 12], [Table 13] and [Table 14] represent 34 more examples (Ex61 to Ex94), listing the same parameters as respectively [Table 3], [Table 4], [Table 5] and [Table 6].

TABLE-US-00011 TABLE 11 No r.sub.0 r.sub.1 r.sub.eq r.sub.2 r.sub.3 n.sub.0 n.sub.2 n.sub.3 (Units) Ratio (m) (m) (m) (m) (m) (1000) (1000) (1000) Ex61 0.5 1.610 3.22 2.415 7.83 10.88 7.04 2.38 4.77 Ex62 0.3 1.062 3.54 2.301 8.27 11.96 7.04 2.09 5.74 Ex63 0.6 1.938 3.23 2.584 7.83 10.88 6.47 1.99 4.77 Ex64 0.3 1.236 4.12 2.678 8.27 10.88 6.9 1.76 6.27 Ex65 0.25 0.785 3.14 1.9625 7.83 10.88 7.66 2.33 4.77 Ex66 0.1 0.407 4.07 2.2385 7.83 10.88 7.72 2.05 4.77 Ex67 0.25 0.928 3.71 2.31875 7.83 10.88 7.25 2.39 4.77 Ex68 0.95 2.584 2.72 2.652 7.83 10.88 6.18 2.28 4.77 Ex69 0.7 2.289 3.27 2.7795 8.7 10.88 6.27 1.98 8.39 Ex70 0.7 2.156 3.08 2.618 7.83 13.05 6.58 2.16 3.95 Ex71 0.1 0.506 5.06 2.783 8.27 13.05 7.74 1.18 5.25 Ex72 0.2 0.828 4.14 2.484 7.83 11.96 7.43 1.94 4.35 Ex73 0.3 1.332 4.44 2.886 8.27 13.05 6.39 1.43 5.25 Ex74 0.1 0.441 4.41 2.4255 8.7 13.05 7.39 1.6 6.9 Ex75 0.4 1.652 4.13 2.891 8.7 13.05 6.48 1.21 6.9 Ex76 0.5 1.720 3.44 2.58 7.83 13.05 6.39 2.17 3.95 Ex77 0.1 0.480 4.8 2.64 8.27 10.88 7.86 1.66 6.27 Ex78 0.6 2.292 3.82 3.056 7.83 11.96 6.54 1.87 4.35 Ex79 0.9 2.763 3.07 2.9165 8.27 10.88 6.21 2.13 6.27 Ex80 0.4 1.612 4.03 2.821 8.27 11.96 6.44 1.82 5.74 Ex81 0.45 1.899 4.22 3.0595 8.27 13.05 6.17 1.4 5.25 Ex82 0.4 1.664 4.16 2.912 8.27 13.05 6.55 1.34 5.25 Ex83 0.3 1.305 4.35 2.8275 8.7 11.96 6.54 1.65 7.58 Ex84 0.6 2.394 3.99 3.192 8.7 11.96 6.15 1.44 7.58 Ex85 0.7 2.345 3.35 2.8475 8.7 11.96 6.42 1.6 7.58 Ex86 0.1 0.434 4.34 2.387 7.83 13.05 8.16 1.76 3.95 Ex87 0.85 2.992 3.52 3.256 8.7 13.05 5.99 1.23 6.9 Ex88 0.1 0.448 4.48 2.464 8.7 10.88 7.93 1.74 8.39 Ex89 0.25 1.150 4.6 2.875 8.27 10.88 7.11 1.74 6.27 Ex90 0.2 0.894 4.47 2.682 7.83 11.96 7.15 1.74 4.35 Ex91 0.45 1.733 3.85 2.79125 8.7 11.96 6.75 1.57 7.58 Ex92 0.9 2.790 3.1 2.945 8.27 13.05 6.09 1.69 5.25 Ex93 0.75 2.790 3.72 3.255 8.7 11.96 6.26 1.44 7.58 Ex94 0.25 1.070 4.28 2.675 7.83 10.88 7.53 2.04 4.77

TABLE-US-00012 TABLE 12 No V.sub.01 V.sub.11 K.sub.1 V.sub.02 K.sub.2 V.sub.12 V.sub.03 V.sub.13 K.sub.3 (Units) (m) (m.sup.2) (m.sup.2) (m) (m) (m.sup.2) (m) (m.sup.2) (m) Ex61 18.9 52.9 57.8 11.0 23.3 121.2 14.5 272.2 130.9 Ex62 18.8 54.9 55.0 9.9 22.1 116.8 21.2 428.5 131.7 Ex63 18.0 51.3 54.0 9.2 20.9 101.2 14.5 272.2 118.8 Ex64 21.0 70.3 52.6 7.3 21.0 90.5 16.4 313.4 121.2 Ex65 17.8 46.0 58.0 10.9 22.5 119.9 14.5 272.2 127.0 Ex66 21.0 68.7 54.3 7.7 21.4 91.7 14.5 272.2 121.5 Ex67 20.1 62.2 55.6 9.8 22.9 113.6 14.5 272.2 129.2 Ex68 16.5 44.3 52.5 11.7 22.4 122.9 14.5 272.2 126.6 Ex69 18.4 54.7 53.0 10.8 22.7 128.7 18.3 358.1 131.8 Ex70 18.2 51.1 55.5 10.3 22.1 111.9 20.6 430.5 131.1 Ex71 24.2 92.4 49.4 3.8 19.5 50.5 25.1 535.0 122.8 Ex72 21.7 72.1 54.6 7.2 21.2 85.7 18.0 355.5 124.2 Ex73 20.7 73.5 47.4 5.5 18.9 69.6 25.1 535.0 119.6 Ex74 21.1 72.8 50.7 6.9 20.6 90.0 30.0 652.8 132.9 Ex75 20.2 67.4 51.0 5.5 18.7 70.9 30.0 652.8 123.4 Ex76 18.4 54.8 52.6 9.5 21.5 107.4 20.6 430.5 127.9 Ex77 24.3 91.1 51.3 5.8 21.6 75.3 16.4 313.4 124.3 Ex78 21.4 71.8 53.5 7.5 21.4 87.4 18.0 355.5 125.1 Ex79 18.4 54.8 53.1 11.1 23.1 125.6 16.4 313.4 131.7 Ex80 20.4 68.6 50.6 7.7 21.0 94.9 21.2 428.5 126.0 Ex81 20.5 71.7 48.2 5.7 19.0 70.8 25.1 535.0 120.1 Ex82 20.7 70.1 51.3 5.5 19.0 68.5 25.1 535.0 120.1 Ex83 21.0 74.1 48.8 7.2 20.8 93.7 24.7 510.5 128.9 Ex84 20.8 71.9 49.6 6.8 20.3 86.1 24.7 510.5 126.2 Ex85 19.1 57.4 54.2 8.6 21.0 103.1 24.7 510.5 129.5 Ex86 22.9 77.8 56.3 6.1 21.0 74.8 20.6 430.5 125.8 Ex87 19.8 65.8 50.2 6.4 19.3 77.9 30.0 652.8 126.3 Ex88 23.0 80.9 53.9 7.3 22.3 96.8 18.3 358.1 129.9 Ex89 23.4 86.5 50.6 6.4 21.6 82.2 16.4 313.4 124.5 Ex90 22.3 79.4 50.9 5.8 20.3 71.9 18.0 355.5 119.6 Ex91 20.5 65.6 54.4 7.6 20.9 95.6 24.7 510.5 129.4 Ex92 18.2 54.4 52.0 8.7 20.6 99.3 25.1 535.0 127.9 Ex93 21.0 71.3 51.8 7.2 20.9 89.1 24.7 510.5 129.0 Ex94 23.4 81.4 55.6 7.2 22.5 87.7 14.5 272.2 126.9

TABLE-US-00013 TABLE 13 CD CD CD MFD MFD Cable No ZDW ZDS 1267.5 1310 1374.5 1310 1550 Cutoff (Units) (nm) (ps/(nm.sup.2 .Math. km)) (ps/(nm .Math. km)) (ps/(nm .Math. km)) (ps/(nm .Math. km)) (m) (m) (nm) Ex61 1354 0.096 9.3 4.5 2.0 8.90 10.24 1247 Ex62 1350 0.098 9.0 4.2 2.4 9.16 10.52 1244 Ex63 1352 0.094 8.9 4.2 2.1 8.87 10.20 1170 Ex64 1348 0.094 8.4 3.8 2.5 8.84 10.13 1200 Ex65 1352 0.099 9.4 4.5 2.2 9.18 10.58 1209 Ex66 1342 0.096 7.9 3.3 3.0 9.03 10.30 1212 Ex67 1342 0.097 8.0 3.3 3.1 9.16 10.44 1259 Ex68 1341 0.096 7.8 3.2 3.1 9.16 10.45 1224 Ex69 1350 0.095 8.7 4.0 2.3 9.04 10.39 1239 Ex70 1354 0.095 9.0 4.4 2.0 8.86 10.20 1260 Ex71 1342 0.093 7.6 3.1 3.0 8.64 9.82 1244 Ex72 1347 0.095 8.3 3.7 2.6 8.82 10.08 1233 Ex73 1340 0.094 7.5 3.0 3.2 8.97 10.21 1200 Ex74 1345 0.096 8.2 3.6 2.8 9.10 10.40 1246 Ex75 1354 0.092 8.7 4.3 1.9 8.62 9.92 1175 Ex76 1343 0.096 8.0 3.4 3.0 9.18 10.48 1260 Ex77 1342 0.094 7.7 3.1 3.0 8.77 9.97 1252 Ex78 1341 0.092 7.4 3.0 3.0 8.65 9.83 1256 Ex79 1342 0.094 7.7 3.2 3.0 9.02 10.29 1259 Ex80 1342 0.095 7.8 3.2 3.0 9.00 10.26 1240 Ex81 1341 0.093 7.4 3.0 3.1 8.83 10.06 1204 Ex82 1350 0.092 8.3 3.9 2.2 8.61 9.88 1185 Ex83 1342 0.095 7.8 3.2 3.1 9.06 10.33 1247 Ex84 1341 0.092 7.3 3.0 3.1 8.76 9.97 1239 Ex85 1359 0.092 9.3 4.8 1.4 8.61 9.95 1211 Ex86 1352 0.093 8.7 4.2 2.1 8.63 9.89 1245 Ex87 1342 0.090 7.3 3.0 2.9 8.63 9.83 1220 Ex88 1350 0.094 8.6 4.0 2.3 8.83 10.13 1250 Ex89 1341 0.093 7.6 3.1 3.1 8.79 10.01 1252 Ex90 1341 0.094 7.6 3.1 3.1 8.84 10.06 1226 Ex91 1359 0.093 9.3 4.8 1.5 8.60 9.93 1216 Ex92 1348 0.093 8.2 3.7 2.4 8.80 10.09 1222 Ex93 1341 0.090 7.3 3.0 3.0 8.61 9.80 1257 Ex94 1347 0.093 8.2 3.6 2.6 8.65 9.87 1260

TABLE-US-00014 TABLE 14 R15BL R10BL R7.5BL R15BL R10BL R7.5BL No at 1550 at 1550 at 1550 at 1625 at 1625 at 1625 (Units) (dB/10turn) (dB/turn) (dB/turn) (dB/10turn) (dB/turn) (dB/turn) BL Type Ex61 0.009 0.07 0.54 0.057 0.23 1.24 A1 Ex62 0.037 0.12 0.58 0.180 0.34 1.16 A1 Ex63 0.072 0.25 1.22 0.370 0.70 2.49 A1 Ex64 0.021 0.11 0.63 0.121 0.33 1.38 A1 Ex65 0.098 0.32 1.53 0.459 0.84 2.97 A1 Ex66 0.027 0.14 0.81 0.149 0.40 1.73 A1 Ex67 0.011 0.08 0.60 0.067 0.25 1.34 A1 Ex68 0.035 0.17 0.95 0.183 0.47 1.97 A1 Ex69 0.021 0.11 0.65 0.117 0.32 1.37 A1 Ex70 0.008 0.04 0.25 0.048 0.14 0.57 A2 Ex71 0.002 0.01 0.09 0.013 0.05 0.22 A2 Ex72 0.008 0.05 0.33 0.050 0.16 0.77 A2 Ex73 0.027 0.07 0.28 0.136 0.20 0.58 A2 Ex74 0.015 0.04 0.19 0.078 0.13 0.38 A2 Ex75 0.019 0.05 0.18 0.103 0.13 0.37 A2 Ex76 0.021 0.08 0.38 0.107 0.22 0.80 A2 Ex77 0.002 0.02 0.23 0.013 0.08 0.57 A2 Ex78 0.001 0.02 0.15 0.010 0.06 0.39 A2 Ex79 0.006 0.06 0.43 0.042 0.18 0.98 A2 Ex80 0.013 0.06 0.35 0.076 0.19 0.76 A2 Ex81 0.014 0.05 0.21 0.080 0.14 0.46 A2 Ex82 0.013 0.04 0.20 0.079 0.14 0.45 A2 Ex83 0.014 0.06 0.29 0.075 0.17 0.62 A2 Ex84 0.005 0.03 0.18 0.032 0.10 0.41 A2 Ex85 0.012 0.05 0.27 0.074 0.16 0.59 A2 Ex86 0.003 0.02 0.15 0.020 0.07 0.37 A2 Ex87 0.004 0.02 0.10 0.029 0.06 0.23 A2 Ex88 0.004 0.04 0.31 0.030 0.13 0.75 A2 Ex89 0.002 0.02 0.24 0.015 0.09 0.60 A2 Ex90 0.008 0.05 0.33 0.053 0.17 0.76 A2 Ex91 0.008 0.04 0.23 0.053 0.13 0.52 A2 Ex92 0.012 0.05 0.21 0.070 0.14 0.47 A2 Ex93 0.001 0.01 0.11 0.011 0.05 0.27 A2 Ex94 0.001 0.01 0.18 0.007 0.06 0.48 A2

[0114] The ranges of the values of the different parameters used in the 94 examples listed in the above tables are presented hereinafter, in [Table 15], [Table 16], [Table 17] and [Table 18].

TABLE-US-00015 TABLE 15 Parameter r.sub.0 r.sub.1 r.sub.eq r.sub.2 r.sub.3 n.sub.0 n.sub.2 n.sub.3 Unit r.sub.0/r.sub.1 m m m m m (1000) (1000) (1000) Minimum value 0.05 0.19 2.61 1.94 7.83 10.88 5.86 1.18 8.39 Maximum value 0.95 2.99 5.06 3.26 8.70 13.05 8.42 2.39 3.95

TABLE-US-00016 TABLE 16 Parameter V.sub.01 V.sub.11 V.sub.02 V.sub.12 V.sub.03 V.sub.13 K.sub.1 K.sub.2 K.sub.3 Unit (m) (m.sup.2) (m.sup.2) (m) (m) (m.sup.2) (m) (m.sup.2) (m) Minimum 16.3 42.4 3.8 50.5 30 652.8 58.3 18.7 132.9 value Maximum 24.3 92.4 11.8 128.7 14.5 277.2 47.4 23.3 118.8 value

TABLE-US-00017 TABLE 17 CD CD CD MFD MFD Cable Parameter ZDW ZDS 1267.5 1310 1374.5 1310 1550 cutoff Unit nm (ps/(nm.sup.2 .Math. km) (ps/(nm.sup.2-km) (ps/(nm.sup.2 .Math. km) (ps/(nm.sup.2 .Math. km) m m nm Minimum 1340 0.090 9.5 4.8 1.4 8.6 9.8 1170 value Maximum 1359 0.099 7.3 3 3.2 9.2 10.6 1260 value

TABLE-US-00018 TABLE 18 R15BL R10BL R7.5BL R15BL R10BL R7.5BL Parameter at 1550 at 1550 at 1550 at 1625 at 1625 at 1625 (Units) (dB/10turn) (dB/turn) (dB/turn) (dB/10turn) (dB/turn) (dB/turn) Minimum value 0.001 0.013 0.090 0.007 0.048 0.224 Maximum value 0.150 0.32 1.53 0.64 0.84 2.97

[0115] Thus, it can be observed from the examples of [Table 3] to [Table 14] and the ranges presented in [Table 15] to [Table 18], that the parameters of radiuses and indexes of the core and cladding of the optical fiber according to the invention, allow to obtain a ZDW which is shifted towards higher wavelengths compared to prior art optical fibers according to the G.652 and G.657 recommendations.

[0116] Indeed, the standard fibers, according to the G.657.A1 recommendation, present a ZDW comprised between 1300 and 1324 nm, while the optical fiber according to the invention presents a ZDW comprised between 1340 and 1359 nm, as illustrated by [Table 17]. Such a shift in the ZDW allows to obtain an optical fiber optimized for a use in the O- and E-bands.

[0117] Furthermore, the Zero Dispersion Slope (ZDS) of the optical fibers according to the invention is mostly below 0.092 ps/(nm.sup.2.Math.km) in Examples 1 to 94, contrarily to the G652 or G657 attributes. Therefore, the optical fibers according to the invention are not compliant with chromatic dispersion attributes of G652 and G657, in particular for the ZDW which is completely different, and for the ZDS in most of the cases.

[0118] Moreover, the present invention also allows to obtain an optical fiber with an MFD, a cable cutoff, and bend losses similar to the ones of the G.652 and G.657 recommendations. More particularly, as illustrated by [Table 1] and [Table 18], the optical fibers according to the invention comply with the macrobend requirements of G657A1 or G657A2.

[0119] Therefore, the present invention allows to obtain a single-mode optical fiber similar to the standard optical fibers of the G.652 and G.657 recommendations, but optimized to operate with higher wavelength in the O- and E-bands due to a higher ZDW which is obtained with specific radiuses (r.sub.0, r.sub.1, r.sub.2, r.sub.3) and indexes (n.sub.0, n.sub.2, n.sub.3) in the core 10 and cladding 20 of the optical fiber 1.