A method of processing by controlling one or more beam characteristics of an optical beam may include: launching the optical beam into a first length of fiber having a first refractive-index profile (RIP); coupling the optical beam from the first length of fiber into a second length of fiber having a second RIP and one or more confinement regions; modifying the one or more beam characteristics of the optical beam in the first length of fiber, in the second length of fiber, or in the first and second lengths of fiber; confining the modified one or more beam characteristics of the optical beam within the one or more confinement regions of the second length of fiber; and/or generating an output beam, having the modified one or more beam characteristics of the optical beam, from the second length of fiber. The first RIP may differ from the second RIP.

An optical fiber includes: a core; and a clad which is formed so as to surround an outer circumference of the core concentrically with the core, the clad having at least an inner cladding layer adjacent to the outer circumference of the core and an outer cladding layer formed on an outer circumference of the inner cladding layer, wherein a refractive index of the outer cladding layer is 3, and an outer circumference radius of the outer cladding layer is r3, a relationship of 1max>3>2min is satisfied, a relationship of 32min0.08% is satisfied, a relationship of r1<r2<r3 is satisfied, a relationship of 0.35r1/r20.55 is satisfied, a cable cut-off wavelength is less than or equal to 1260 nm, and an MFD at a wavelength of 1310 nm is 8.6 m to 9.2 m.

The optical fiber comprises a glass fiber including a core and a cladding. The cladding includes an inner cladding surrounding an outer periphery of the core, a trench surrounding an outer periphery of the inner cladding, and an outer cladding surrounding an outer periphery of the trench. The inner cladding has a refractive index lower than a refractive index of the core. The trench has a refractive index lower than the refractive index of the inner cladding. The outer cladding has a refractive index higher than the refractive index of the trench and lower than the refractive index of the core. The core is doped with germanium. The inner cladding has an average chlorine mass concentration of 500 ppm or more and 5000 ppm or less.

According to embodiments, an optical fiber may include a core portion comprising an outer radius r.sub.C and a maximum relative refractive index .sub.Cmax. A cladding may surround the core portion and include a low-index trench and an outer cladding. The low index trench may surround the core portion and includes an outer radius r.sub.T and relative refractive index .sub.T. The outer cladding may surround and be in direct contact with the low-index trench. The outer cladding may be formed from silica-based glass comprising greater than 1.0 wt. % bromine and has a relative refractive index .sub.OC, wherein .sub.cmas>.sub.OC>.sub.T. The optical fiber may have a cable cutoff of less than or equal to 1530 nm. An attenuation of the optical fiber may be less than or equal to 0.185 dB/km at a wavelength of 1550 nm.

Disclosed herein are methods, apparatus, and systems for providing an optical beam delivery device, comprising a first length of fiber comprising a first RIP formed to enable modification of one or more beam characteristics of an optical beam by a perturbation device and a second length of fiber having a second RIP coupled to the first length of fiber, the second RIP formed to confine at least a portion of the modified beam characteristics of the optical beam within one or more confinement regions.

Disclosed herein are methods, apparatus, and systems for perturbing an optical beam propagating within a first length of fiber to adjust one or more beam characteristics of the optical beam in the first length of fiber or a second length of fiber or a combination thereof, coupling the perturbed optical beam into a second length of fiber and maintaining at least a portion of one or more adjusted beam characteristics within a second length of fiber having.

Disclosed herein are methods, apparatus, and systems for providing an optical beam delivery system, comprising an optical fiber including a first length of fiber comprising a first RIP formed to enable, at least in part, modification of one or more beam characteristics of an optical beam by a perturbation assembly arranged to modify the one or more beam characteristics, the perturbation assembly coupled to the first length of fiber or integral with the first length of fiber, or a combination thereof and a second length of fiber coupled to the first length of fiber and having a second RIP formed to preserve at least a portion of the one or more beam characteristics of the optical beam modified by the perturbation assembly within one or more first confinement regions. The optical beam delivery system may include an optical system coupled to the second length of fiber including one or more free-space optics configured to receive and transmit an optical beam comprising the modified one or more beam characteristics.

The present disclosure relates to a fiber optic cable arrangement including a plurality of fiber optic cables. At a central section of the fiber optic cable arrangement, the fiber optic cables are arranged in a core and are protected by an outer split sleeve. At end sections of the fiber optic cable arrangement, the fiber optic cables form connectorized pigtails. Transitions form demarcation locations (e.g., fan-out or break-out locations) between the central section and the end sections. The transitions include one or more tape layers and/or one or more heat shrink layers.

An optical fiber having both low macrobend loss and low microbend loss. The fiber has a central core region, a first (inner) cladding region surrounding the central core region and having an outer radius r.sub.2>16 microns and relative refractive index .sub.2, and a second (outer) cladding region surrounding the first cladding region having relative refractive index, .sub.3, wherein .sub.1>.sub.3>.sub.2. The difference between .sub.3 and .sub.2 is greater than 0.12 percent. The fiber exhibits a 22 m cable cutoff less than or equal to 1260 nm, and r.sub.1/r.sub.2 is greater or equal to 0.24 and bend loss at 1550 nm for a 15 mm diameter mandrel of less than 0.5 dB/turn.

An optical device including first and second optical elements formed of mutually different materials, and a bonding member bonding the first and second optical elements to each other, wherein the following conditional expression is satisfied:

0.14<Log(te/tc)Log(E1E2/Ec.sup.2)<5.0

where tc is a thickness in an optical axis direction of the bonding member on an optical axis, te is a thickness in the optical axis direction of the bonding member in a maximum diameter of interfaces between the first and second optical elements and the bonding member, and E1, E2, and Ec are respective Young's moduli of the first and second optical elements and the bonding member.