An optical device having a self-repair component capable of curing a defective component(s) is disclosed. To improve reliability as well as manufacturing yield, a photonic integrated circuit (PIC) for as a multi-channel optical line terminal (OLT) contains spare lasers or standby lasers configured to replace a failed laser(s). In one aspect, PIC includes a set of fixed-wavelength lasers (FWLs), a tunable-wavelength auxiliary laser (TWAL), a photonic detector, and a tuner. FWLs, for example, generate optical wavelengths representing optical signals. TWAL generates an optical signal with a spectrum of wavelengths based on a setting generated by the tuner. The photonic detector detects a defective wavelength. The tuner adjusts output wavelength of TWAL in response to the defective wavelength. Alternatively, PIC includes a working laser array, standby laser array, and spare laser array capable of providing two-layer laser defective protections.

There is presented an apparatus for use with a Wavelength Division Multiplexed Passive Optical Network (WDM-PON). The apparatus comprises an electronic controller, optical transmitters and a wavelength multiplexer. The electronic controller is configured to receive first input electrical data signals, output electrical data signals on data channels based upon the input electrical data signals and change the data rate of at least a first of the output electrical data signals. The optical transmitters, which receive the electrical data signals, are each configured to receive, respectively on different data channels, electrical data signals output from the electronic controller. The optical transmitters output light signals corresponding to the received electrical data signals from the electronic controller. Respective light signals of each optical transmitter are centred on a different wavelength to the light signals of the other optical transmitters. The wavelength multiplexer is configured to receive the output light signals from the optical transmitters and output a wavelength multiplexed optical output signal.

Aspects of the present disclosure describe systems, methods and structures including high-density submarine/undersea reconfigurable optical add/drop multiplexers (ROADM) having remote wavelength selective switch (WSS) redundancy.

To achieve changing a setting of a control unit disposed in a submarine optical communication apparatus after disposing undersea. An optical component processes a main signal output from an optical communication apparatus. A programmable control unit controls the optical component. A reception unit receives a control signal multiplexed with the main signal, converts the control signal into an electric signal, and outputs the electric signal to the programmable control unit. The programmable control unit switches a control scheme of the optical component in response to the electric signal.

A transmitter can include: at least one primary laser emitter configured to emit primary laser light; at least one primary monitor photodiode optically coupled with the at least one primary laser emitter; and at least one spare laser emitter configured to emit spare laser light. Each spare laser emitter can be adjacent with a corresponding primary laser emitter such that a first primary laser emitter and a first spare laser emitter pair are directed through an optical system and out a common optical fiber.

The present disclosure relates to systems and method for deploying a fiber optic network. Distribution devices are used to index fibers within the system to ensure that live fibers are provided at output locations throughout the system. In an example, fibers can be indexed in multiple directions within the system. In an example, spare ports can be providing in a forward direction and reverse direction ports can also be provided.

An optical device having a self-repair component capable of curing a defective component(s) is disclosed. To improve reliability as well as manufacturing yield, a photonic integrated circuit (PIC) for as a multi-channel optical line terminal (OLT) contains spare lasers or standby lasers configured to replace a failed laser(s). In one aspect, PIC includes a set of fixed-wavelength lasers (FWLs), a tunable-wavelength auxiliary laser (TWAL), a photonic detector, and a tuner. FWLs, for example, generate optical wavelengths representing optical signals. TWAL generates an optical signal with a spectrum of wavelengths based on a setting generated by the tuner. The photonic detector detects a defective wavelength. The tuner adjusts output wavelength of TWAL in response to the defective wavelength. Alternatively, PIC includes a working laser array, standby laser array, and spare laser array capable of providing two-layer laser defective protections.

An optical device includes: a first port group P including n ports P.sub.i; a second port Q; and a wavelength multiplexer/demultiplexer disposed between the first port group P and the second port Q. In a case where light beams L.sub.i of predetermined different n wavelengths .sub.i corresponding to the respective ports P.sub.i are inputted to the wavelength multiplexer/demultiplexer, the wavelength multiplexer/demultiplexer combines the light beams L.sub.i into light L and outputs the light L to the second port Q. In a case where light L is inputted to the second port Q, the wavelength multiplexer/demultiplexer separates the light L into light beams L.sub.i of the wavelengths .sub.i and outputs the light beams L.sub.i to the corresponding ports P.sub.i.

A device includes a first excitation light source that emits first excitation light, a second excitation light source that emits second excitation light, a wavelength converter that converts signal light of a first wavelength into signal light of a second wavelength according to the first excitation light, and a measurer that measures a frequency difference between the first excitation light and the second excitation light, wherein when an abnormality of the first excitation light is detected, the second excitation light source is adjusted so that a frequency of the second excitation light is aligned with a frequency of the first excitation light before the abnormality detection, based on the frequency difference before the abnormality detection, and the wavelength converter converts the signal light of the first wavelength into the signal light of the second wavelength according to the second excitation light, after adjusting the frequency of the second excitation light.

A transport network is configured to connect one or more optical rings of optical add and drop devices with one or more digital units in a radio access network. The transport network comprises a first electronic cross-connect and a second electronic cross-connect. A switch is provided for connecting the first electronic cross-connect and/or the second electronic cross-connect to the one or more digital units. The first and second electronic cross-connects are each coupled to at least one of the one or more optical rings of optical add and drop devices.