Embodiments of the present disclosure provide an optical repeater and an optical fiber communications system. An implementation solution of the optical repeater includes: a first input end of the optical repeater, a first output end of the optical repeater, a first erbium doped fiber, a first coupler, a second coupler, and a first pump light processing component, where the first input end of the optical repeater is connected to an input end of the first erbium doped fiber, an output end of the first erbium doped fiber is connected to an input end of the first coupler, a first output end of the first coupler is connected to a first input end of the second coupler, and an output end of the second coupler is connected to the first output end of the optical repeater.

Disclosed herein are methods, devices, and system for beam forming and beam steering within ultra-wideband, wireless optical communication devices and systems. According to one embodiment, a free space optical (FSO) communication apparatus is disclosed. The FSO communication apparatus includes an array of optical sources wherein each optical source of the array of optical sources is individually controllable and each optical source configured to have a transient response time of less than 500 picoseconds (ps).

Interruption system 10 configured to control transmission of an optical signal, the system comprising a solid state optical amplifier (AMP, AMP1, AMP2) configured to receive: an input optical signal (SOE, SOE1, SOE2), and a control signal (SC, SC1, SC2) configured to control the semiconductor optical amplifier (AMP, AMP1, AMP2),
characterised in that the interruption system further comprises a cooling device (12, 12-1, 12-2) configured to cool the semiconductor optical amplifier (AMP, AMP1, AMP2) to a temperature greater than or equal to 10 K, preferably greater than or equal to 40 K, and to cool the optical modulator to a temperature less than or equal to 90 K, preferably less than or equal to 80 K.

An integrated circuit includes a silicon photonics substrate and includes a transimpedance amplifier (TIA) chip and a driver chip arranged on the silicon photonics substrate. The silicon photonics substrate includes a silicon-based material, includes electrical connections, and includes silicon photonics components configured to receive and transmit optical signals. The TIA chip includes a silicon-germanium material that is different from the silicon-based material, is connected via the electrical connections to at least one of the silicon photonics components configured to receive an optical signal, and is configured to process a received optical signal and to output a processed signal to a digital signal processor. The driver chip includes CMOS material that is different from the silicon-germanium material and the silicon-based material, and is connected via the electrical connections to drive at least one of the silicon photonics components configured to generate an optical signal for transmission.

Disclosed herein are devices, methods, and systems for selectively amplifying optical signals using an optical circuit. The optical circuit includes an input port to receive a plurality of input laser signals and a switching array connected to the input port. The switching array includes a plurality of switching optical amplifiers configured to amplify a laser signal of the plurality of input laser signals as an amplified laser signal and absorb the remaining of the plurality of input laser signals. The optical circuit also includes a splitting circuit connected to the switching array. The splitting circuit is configured to split the amplified laser signal into a plurality of output laser signals.

Provided are an optical amplification circuit, an optical amplification method, and an optical circuit for amplifying an unpolarized optical signal. The optical amplification circuit may include an input interface, a pair of optical amplifiers having Polarization-Dependent Gain (PDG) profiles, and an output interface. The input interface receives the unpolarized optical signal. The input interface outputs a first polarization component and a second polarization component based on the received unpolarized optical signal. The pair of optical amplifiers may amplify the first polarization component and the second polarization component based on the PDG profiles. The output interface may output an amplified version of the unpolarized optical signal based on the amplified first polarization component and the amplified second polarization component.