An amplification method intended for a PON access network, which includes an OLT with multiple ports and with one bidirectional amplifier per port that is shared for the transmission downlink and uplink, at least one ODN connecting a given port of the OLT to a plurality of ONUs and defining a transmission channel, access to the transmission channel for the uplink being of TDMA type and the transmission channel for the downlink being time-shared. The method includes, for a given ODN: receiving bursts from the ONUs, modulating the gain of the amplifier in synchronicity with the received bursts.

An optical pump unit may include a line voltage transistor, coupled between an input side and an output side of the optical pump unit. The optical pump may further include a DC-to-DC converter, having an input side coupled to the line voltage transistor; an optical pump assembly, coupled to an output side of the DC-to-DC converter; a current control assembly, coupled to the optical pump assembly; a throttle back control assembly, having an output coupled to the current control assembly, and a current/voltage sensor, to monitor a line current and voltage drop in the optical repeater, and being coupled to an input of the throttle back control assembly. As such, the throttle back control assembly may be configured to send a signal to the current control assembly to reduce a power at the optical pump assembly when a decrease in line current or voltage drop takes place.

An optical pump unit may include a line voltage transistor, coupled between an input side and an output side of the optical pump unit. The optical pump may further include a DC-to-DC converter, having an input side coupled to the line voltage transistor; an optical pump assembly, coupled to an output side of the DC-to-DC converter; a current control assembly, coupled to the optical pump assembly; a throttle back control assembly, having an output coupled to the current control assembly, and a current/voltage sensor, to monitor a line current and voltage drop in the optical repeater, and being coupled to an input of the throttle back control assembly. As such, the throttle back control assembly may be configured to send a signal to the current control assembly to reduce a power at the optical pump assembly when a decrease in line current or voltage drop takes place.

The systems, apparatuses and methods of the present invention set forth improvements to the problems of the current pairing or duplex paradigm, resulting in a dramatic increase in fiber transmission efficiency, accomplished explicitly by restructuring presently-aligned C-Band wavelengths into innovative DWDM transmit and receive formats, and through implementing photonic-wave changes, which directs Ethernet data flow onto new path adaptations. These improvements could reduce line haul expenses significantly, believed to reach a projected 50% less requirement/deployment of fiber strands. This saving would offer owner-operators substantial fiber strand cost reductions, affecting transportation rates of high-bandwidth digital payloads traversing over DWDM networks, and lower usage rates of cross-connections amid multiple equipment inter-exchanging throughout large data centers.

An optical amplification apparatus, an optical transmission system, and an optical amplification method that make it possible to suppress deterioration in signal light quality are provided. An optical amplification apparatus is an optical amplification apparatus connected between a first multi-core fiber and a second multi-core fiber, and includes: a switch configured to switch a transmission direction of signal light being unidirectionally transmitted in the first multi-core fiber and the second multi-core fiber, into bidirectional transmission; and an amplifier configured to amplify the signal light being bidirectionally transmitted.

An optical amplification apparatus, an optical transmission system, and an optical amplification method that make it possible to suppress deterioration in signal light quality are provided. An optical amplification apparatus is an optical amplification apparatus connected between a first multi-core fiber and a second multi-core fiber, and includes: a switch configured to switch a transmission direction of signal light being unidirectionally transmitted in the first multi-core fiber and the second multi-core fiber, into bidirectional transmission; and an amplifier configured to amplify the signal light being bidirectionally transmitted.

An object is to provide a monitoring signal light output apparatus capable of transmitting a monitoring signal light with a simple configuration. An optical demultiplexer (11) is inserted into an optical fiber (F1) and demultiplexes a monitoring signal light (M1) transmitted through the optical fiber (F1). A SOA (13) amplifies and modulates the monitoring signal light (M1) separated by the optical demultiplexer (11). A control unit (15) outputs a signal (Si) indicating a state of a submarine apparatus. A SOA drive unit (14) outputs a drive signal (S2) to the SOA (13) in response to the signal (Si) to perform a modulation operation of the monitoring signal light (M1). An optical multiplexer (17) multiplexes the monitoring signal light (M1) amplified and modulated by the SOA (13) into the signal light transmitted by the optical fiber (F1). The monitoring signal light output apparatus is mounted on the submarine apparatus.

An optical transmission apparatus is disposed at an end of a single-core optical fiber and is used when signal light is transmitted bidirectionally by the optical fiber. The optical transmission apparatus includes an optical transmitter that transmits a first signal light in one direction belonging to the signal light, an optical receiver that receives a second signal light in an opposite direction belonging to the signal light, an optical circulator that guides the first signal light transmitted from the optical transmitter to the optical fiber and guides the second signal light from the optical fiber to the optical receiver, and a light source that outputs, to the optical fiber, pump light for Raman-amplifying the second signal light to a second optical power higher than a first optical power of the first signal light.

Disclosed are a system and a method for configuring an optical transmission system. A process may include arranging a first ruggedized repeater on or in a first object or structure. A second ruggedized repeater may be arranged on or in a second object or structure different from the first object or structure. A third ruggedized repeater may be arranged on or in a third object or structure different from the first and second objects or structures, wherein: (i) a first distance between the first ruggedized repeater and the second ruggedized repeater and (ii) a second distance between the second ruggedized repeater and the third ruggedized repeater are equal or nearly equal and based on signal loss.

Disclosed are a system and a method for configuring an optical transmission system. A process may include arranging a first ruggedized repeater on or in a first object or structure. A second ruggedized repeater may be arranged on or in a second object or structure different from the first object or structure. A third ruggedized repeater may be arranged on or in a third object or structure different from the first and second objects or structures, wherein: (i) a first distance between the first ruggedized repeater and the second ruggedized repeater and (ii) a second distance between the second ruggedized repeater and the third ruggedized repeater are equal or nearly equal and based on signal loss.