A method (100) is disclosed for filtering an optical signal to generate at least one electrical output. The method comprises receiving an optical signal (110) and directing at least a part of the optical signal through an nm array of wavelength selective elements (120), the nm array comprising n parallel groups, each group comprising m coupled wavelength selective elements. The method further comprises photodetecting an output from each of the n groups of coupled wavelength selective elements (130), and electrically selecting at least one of the photodetected outputs (140). Also disclosed are an optical filtering module (200, 300) a controller (400) for an optical filtering module and a computer program.

In order to provide an optical transmission device capable of implementing the spectral control of WDM signals while taking into account optical component characteristics, an optical transmission device is provided with: a WSS; a wavelength monitor that outputs a signal expressing a first spectrum, which is the spectrum of the WSS optical output; an optical processing unit that subjects the WSS optical output to prescribed processing; a temperature monitor that outputs a signal indicating the temperature of an optical processing means; and a control unit that receives the input of the signal expressing the first spectrum and the signal indicating the temperature, and controls the transmission characteristics of the WSS on the basis of the first spectrum and the temperature.

Exemplary methods and apparatus may provide optical gates and optical switches using such optical gates. Each optical gate may include a semiconductor optical amplifier that is placed in a substrate. The semiconductor optical amplifier may be coupled to input and output couplers to receive and selectively output optical signals into and out of the substrate.

Disclosed is a method and device for target sequence identification, wherein an optical binary sequence and an all-zero sequence are subjected to an XNOR operation and a first candidate sequence set is generated by splitting the result sequence; a second candidate sequence set is generated by splitting the optical binary sequence; multiple binary sequences are selected from the first candidate sequence set and the second candidate sequence set according to the target sequence to generate a to-be-delayed sequence set; various delay duration are configured for each binary sequence of the to-be-delayed sequence set; a to-be-matched sequence set is generated after delaying; an AND operation is performed on the sequences of the to-be-matched sequence set to generate a final sequence; and the number and position of the target sequence in the binary sequence can be determined according to the number and position of a pulse in the final sequence.

A network is provided with a plurality of nodes connected to one another. At least one node of the plurality of nodes include one or more transponders. For example, the transponders may be configured to receive optical signals having a first set of wavelengths at a first degree of a plurality of degrees in the at least one node. The transponders may convert the received optical signals into electrical signals, and then regenerate optical signals by generating, based on the electrical signals, optical signals having a second set of wavelengths. The node may further include one or more switches configured to route the regenerated optical signals to one or more of the plurality of degrees of the at least one node.

This disclosure describes devices related to multiplexing optical data signals. A system may be disclosed for multiplexing one or more optical data signals. The system may comprise a forty channel dense wave division multiplexer (DWDM) configured combine one or more optical data signals. The system may comprise a booster optical amplifier configured to amplify the combined one or more optical data signals and output a first amplified optical data signal. The system may comprise a variable optical amplifier (VOA) communicatively configured to receive the amplified first optical data signal, adjust the power of the amplified first optical data signal to a first level, and output a second optical data signal. The system may comprise a WDM communicatively coupled to the VOA, the WDM configured to output a combined second optical data signal and one or more third signals to a primary fiber.

Disclosed is a method and device for target sequence identification, wherein an optical binary sequence and an all-zero sequence are subjected to an XNOR operation and a first candidate sequence set is generated by splitting the result sequence; a second candidate sequence set is generated by splitting the optical binary sequence; multiple binary sequences are selected from the first candidate sequence set and the second candidate sequence set according to the target sequence to generate a to-be-delayed sequence set; various delay duration are configured for each binary sequence of the to-be-delayed sequence set; a to-be-matched sequence set is generated after delaying; an AND operation is performed on the sequences of the to-be-matched sequence set to generate a final sequence; and the number and position of the target sequence in the binary sequence can be determined according to the number and position of a pulse in the final sequence.

A method and an apparatus for establishing a transmission path for exchanging an optical signal, where a gate device is disposed in front of an optical switch matrix, where the optical signal reaches the optical switch matrix through the gate device. A working state of the gate device and a working state of a first optical switch used for transmitting the optical signal in the optical switch matrix are adjusted in a time sequence such that when a transmission path used for transmitting the optical signal in the optical switch matrix is established, dynamic crosstalk can be reduced, and communication quality is improved.

A fast optical (with or without a photonic crystal) switch is fabricated/constructed, utilizing a phase transition material/Mott insulator, activated by either an electrical pulse (a voltage pulse or a current pulse) and/or a light pulse and/or pulses in terahertz (THz) frequency of a suitable field strength and/or hot electrons. The applications of such a fast optical switch for an on-demand optical add-drop subsystem, integrating with (a) a light slowing/light stopping component (based on metamaterials and/or nanoplasmonic structures) and (b) with or without a wavelength converter are also described.

Split cascode circuits include multiple cascode paths coupled between voltage supply rails. Each cascode path includes a pair of controllable switches. A feedback path is provided for at least one of the cascode circuit paths. An active load circuit may also have a split cascode structure. Multiple-stage circuits, for implementation in Trans-Impedance Amplifiers (TIAs) or analog Receive Front-End modules (RXFEs), for example, include multiple stages of split cascode circuits.