A radio frequency (RF) transceiver comprising: a transmitter configured to produce a plurality of optical carriers; a multi-wavelength electro-optic modulator configured to receive the plurality of optical carriers from the transmitter, wherein the electro-optic modulator is configured to modulate each optical carrier using a same input RF signal, but with a different efficiency for each optical carrier so as to generate an arbitrary number of RF links with various efficiencies using a single modulation electrode; and a receiver designed to produce a synthesized transfer function based on a truncated Fourier Series and configured to use the synthesized transfer function to adjust intermodulation distortion response to optimize dynamic range for the transceiver's operating resolution bandwidth and noise characteristics.

An all-optical signal processor includes one or more input ports configured to receive one or more optical signal channels, a first nonlinear optical processor configured to receive an input signal from the input port and having one or more sections of a first nonlinear medium, an optical phase conjugator optically configured to receive the output signal of the first nonlinear optical processor, a second nonlinear optical processor configured to receive an output signal from the optical phase conjugator and having one or more sections of a second nonlinear medium, and one or more output ports configured to receive the output signal from the second nonlinear optical processor. Variations of the all-optical signal processor can include a single nonlinear optical processor through which an output of the optical phase conjugator co-propagates or counter-propagates with the input signal.

An all-optical signal processor includes one or more input ports configured to receive one or more optical signal channels, a first nonlinear optical processor configured to receive an input signal from the input port and having one or more sections of a first nonlinear medium, an optical phase conjugator optically configured to receive the output signal of the first nonlinear optical processor, a second nonlinear optical processor configured to receive an output signal from the optical phase conjugator and having one or more sections of a second nonlinear medium, and one or more output ports configured to receive the output signal from the second nonlinear optical processor. Variations of the all-optical signal processor can include a single nonlinear optical processor through which an output of the optical phase conjugator co-propagates or counter-propagates with the input signal.

An optical module includes a light emitter array in which a plurality of light emitters are arranged, and a lens group which converges light beams output from the light emitter array, wherein in a stage where the light beams reach the lens group, planes of polarization of the light beams are different between adjacent light emitters.

An optical module includes a light emitter array in which a plurality of light emitters are arranged, and a lens group which converges light beams output from the light emitter array, wherein in a stage where the light beams reach the lens group, planes of polarization of the light beams are different between adjacent light emitters.

A method and device is provided for reducing optical transmission impairments, particularly nonlinear effects, of at least one link Said method comprising the following steps: extracting a phase information () from an optical signal (120) received via that at least one link, determining a nonlinear coefficient (), associated with the at least one link, based on the phase information (), applying a control mechanism (202) using the nonlinear coefficient (). Furthermore, a communication system is suggested comprising said device.

A method and device is provided for reducing optical transmission impairments, particularly nonlinear effects, of at least one link Said method comprising the following steps: extracting a phase information () from an optical signal (120) received via that at least one link, determining a nonlinear coefficient (), associated with the at least one link, based on the phase information (), applying a control mechanism (202) using the nonlinear coefficient (). Furthermore, a communication system is suggested comprising said device.

Multiple receivers are comprised in a flexible coherent transceiver of a multi-span optical fiber network. Each of the multiple receivers is operative to handle communications on a respective channel. The multiple receivers measure optical characteristics. For each of the multiple receivers, the optical characteristics include optical nonlinear interactions on the respective channel, the optical nonlinear interactions being at least partially dependent from one span to another span. An optical power of a signal on each of the multiple channels is adjusted as a function of the optical characteristics.

A host device uses an intermediate frequency determined based on frequencies of a second-order nonlinear intermodulation distortion component and a harmonic component which are generated in an analog optical link connected to the host device, for example, an analog optical link of a distributed antenna system (DAS), and precompensates for the second-order nonlinear intermodulation distortion component and the harmonic component generated in the analog optical link.

An optical transmission device includes: a memory; and a processor coupled to the memory; the processor: generate a first symbol by mapping a transmission data series to a first signal point which belongs to a first group within a signal space defined with regard to characteristics of an optical carrier wave of the transmission data series; generate a second symbol by mapping the transmission data series to a second signal point belonging to a second group; calculate a perturbation quantity of a signal electric field for each of the first and second symbols based on signal electric field vector information of a symbol which is generated before the first symbol and the second symbol; and determine, as a transmission signal, a symbol having a smaller perturbation quantity between the first symbol and the second symbol.