Abstract: Embodiments of this application disclose an upstream transmission resource allocation method and a related device. First, an OLT determines an upstream rate threshold of an ONU based on transmission quality information of upstream data sent by the ONU. The OLT further obtains a to-be-transmitted data amount of the ONU. Then, the OLT determines an upstream transmission timeslot of the ONU and an upstream transmission rate of the ONU. The upstream transmission rate of the ONU is less than or equal to the upstream rate threshold. The ONU is configured to send data of the to-be-transmitted data amount to the OLT in the upstream transmission timeslot based on the upstream transmission rate.

Abstract: Embodiments of the present disclosure provide example frequency domain equalization methods, example equalizers, example optical receivers, and example systems. One example method includes obtaining, by an optical receiver, a first complex signal. The first complex signal is a first time domain signal. The first complex signal is obtained based on two channels of mutually independent digital electrical signals. The optical receiver converts the first complex signal into a frequency domain signal, and multiplies the first complex signal in frequency domain by a tap coefficient to obtain a second complex signal. The tap coefficient is used to implement signal compensation for the first complex signal in frequency domain. The optical receiver converts the second complex signal into a second time domain signal, divides the second time domain signal into two channels of real signals, and outputs the two channels of the real signals.

Abstract: A coherent optical receiving apparatus including a polarization optical splitter, a polarization controller, an optical hybrid unit, and a combiner. The polarization optical splitter is connected to an input terminal of the optical hybrid unit, and an output terminal of the optical hybrid unit is connected to the combine. The polarization optical splitter receives signal light and local oscillator light in any polarization mode, decomposes the signal light into a plurality of beams of sub signal light, and decomposes the local oscillator light into a plurality of beams of sub local oscillator light. The optical hybrid unit obtains a plurality of beams of hybrid light by performing optical hybridization on the sub signal and sub local oscillator lights, the combiner performs conversion on the plurality of beams of hybrid light to obtain and output coherent electrical signals, and the polarization controller controls polarization of the local oscillator light.

Abstract: An optical module includes a processing component and a plug component. The plug component includes a plurality of filters. The plurality of filters are connected to a plurality of secondary ports. The processing component includes a plurality of primary ports. The optical module is in a first connection status or a second connection status. When the optical module is respectively in the first connection status or the second connection status, a wavelength of a second service optical signal or a wavelength of a second local oscillator optical signal that are sent by the plurality of filters varies. When the optical module is in a same connection status, wavelengths of the second service optical signal and the second local oscillator optical signal that are sent by the plurality of filters are identical.

Abstract: A coherent optical receiving apparatus including a polarization optical splitter, a polarization controller, an optical hybrid unit, and a combiner. The polarization optical splitter is connected to an input terminal of the optical hybrid unit, and an output terminal of the optical hybrid unit is connected to the combine. The polarization optical splitter receives signal light and local oscillator light in any polarization mode, decomposes the signal light into a plurality of beams of sub signal light, and decomposes the local oscillator light into a plurality of beams of sub local oscillator light. The optical hybrid unit obtains a plurality of beams of hybrid light by performing optical hybridization on the sub signal and sub local oscillator lights, the combiner performs conversion on the plurality of beams of hybrid light to obtain and output coherent electrical signals, and the polarization controller controls polarization of the local oscillator light.

Abstract: A first optical transmission device includes a plurality of first lasers having a different corresponding wavelength, a first optical path component, a first modulator, and a first processor portion. The plurality of first lasers is connected to a plurality of optical input ports of the first optical path component respectively. The first optical path component is configured to perform multiplexing on continuous light of different wavelengths emitted by the plurality of first lasers, and perform power splitting of multiplexed continuous light thereby obtaining two paths of continuous light, send a first path of continuous light to the first modulator, and send a second path of continuous light to a second optical transmission device at a peer end. The first processor portion is configured to send a first analog signal to the first modulator. The first modulator is configured to at least modulate the first analog signal onto the first path.

Abstract: An optical transceiver apparatus and an optical signal processing method. The optical transceiver apparatus may include a light source, an optical signal processor, and an optical path selector. The light source is separately connected to the optical signal processor and the optical path selector, and the optical signal processor is connected to the optical path selector. The light source is configured to provide a first local oscillator optical signal and a first carrier optical signal. The optical signal processor is configured to modulate the first carrier optical signal and output a first modulated optical signal. The optical path selector is configured to transmit the first local oscillator optical signal and the first modulated optical signal to the optical signal processor or a transmission fiber. Herein, the transmission fiber is configured to transmit an optical signal to an outside of the optical transceiver apparatus.

Abstract: A coherent optical receiving apparatus including a polarization optical splitter, a polarization controller, an optical hybrid unit, and a combiner. The polarization optical splitter is connected to an input terminal of the optical hybrid unit, and an output terminal of the optical hybrid unit is connected to the combine. The polarization optical splitter receives signal light and local oscillator light in any polarization mode, decomposes the signal light into a plurality of beams of sub signal light, and decomposes the local oscillator light into a plurality of beams of sub local oscillator light. The optical hybrid unit obtains a plurality of beams of hybrid light by performing optical hybridization on the sub signal and sub local oscillator lights, the combiner performs conversion on the plurality of beams of hybrid light to obtain and output coherent electrical signals, and the polarization controller controls polarization of the local oscillator light.

Abstract: Embodiments of the present disclosure provide example frequency domain equalization methods, example equalizers, example optical receivers, and example systems. One example method includes obtaining, by an optical receiver, a first complex signal. The first complex signal is a first time domain signal. The first complex signal is obtained based on two channels of mutually independent digital electrical signals. The optical receiver converts the first complex signal into a frequency domain signal, and multiplies the first complex signal in frequency domain by a tap coefficient to obtain a second complex signal. The tap coefficient is used to implement signal compensation for the first complex signal in frequency domain. The optical receiver converts the second complex signal into a second time domain signal, divides the second time domain signal into two channels of real signals, and outputs the two channels of the real signals.

Abstract: One example optical transceiver includes an optical interface, an optical receiver, and a polarization-maintaining optical waveguide, where the optical receiver includes a mixer, an optical-to-electrical converter, an analog-to-digital converter, and a digital signal processor.

Abstract: A data processing method includes performing first equalization processing on a data stream that comprises a plurality of sub-data stream segments, performing segment de-interleaving on the data stream, separately performing first forward error correction (FEC) decoding on each sub-data stream segment in a data stream, performing, according to an equalization termination state of each sub-data stream segment, second equalization processing on each sub-data stream segment, performing second FEC decoding on the data stream, and outputting the data stream obtained according to the second FEC decoding in response to a preset iteration termination condition being met, or performing, in response to the preset iteration termination condition not being met, according to the equalization termination state of each sub-data stream segment obtained according to the first equalization, the second equalization processing on each sub-data stream segment obtained according to the second FEC decoding.

Abstract: A coherent optical receiving apparatus includes a polarization beam splitting unit, an optical frequency mixing unit, and a combining unit. The polarization beam splitting unit is configured to receive local oscillator light in any polarization state, and perform polarization state split on the received local oscillator light to obtain first polarized light in a linear polarization state. The optical frequency mixing unit is configured to perform frequency mixing on the first polarized light and second polarized light, and output mixed light to the combining unit. The second polarized light is polarized light in a linear polarization state obtained by splitting signal light. The combining unit is configured to combine every two paths of light output by the optical frequency mixing unit into one path for output.

Abstract: The present disclosure relates to an apparatus and method of processing a digital signal, wherein an input signal is transformed into the frequency domain by applying a fast Fourier transformation (FFT) processing to obtain a transformed input signal. Positive and negative frequency components of the transformed input signal are separated and respective ones of the separated positive and negative frequency components are separately processed by respective digital filtering to obtain filtered frequency components. The filtered frequency components are combined in the frequency domain using a down-sampling operation for down-sampling the filtered frequency components from an input number of samples per symbol to a different output number of samples per symbol, and the combined output components are converted into the time domain by applying an IFFT processing.

Abstract: Embodiments of the present invention provide an optical transceiver including an optical interface, an optical receiver, and a polarization-maintaining optical waveguide, where the optical receiver includes a mixer, an optical-to-electrical converter, and a digital signal processor.

Abstract: An optical transmitter, an optical receiver, and an optical transmission method are disclosed. The optical transmitter includes an optical signal generator, N spreaders, N pairs of data modulators, and a combiner, where the optical signal generator generates N optical carriers; an ith spreader spreads an ith optical carrier, to obtain a spread optical signal having two subcarriers; splits the spread optical signal into a first optical signal and a second optical signal; and delays the second optical signal to obtain a third optical signal; an ith pair of data modulators modulate the first optical signal and the third optical signal to obtain a pair of modulated optical signals, transmit the pair of modulated optical signals to the combiner, where the pair of modulated optical signals reaching the combiner differ by 1/(4 fsi) in time domain; and the combiner combines, into one optical signal, N pairs of modulated optical signals.

Abstract: A receiver in the present disclosure includes: a first input end, N first output ends, N baseband signal recovery modules, and a multiple-input multiple-output equalization module. Each baseband signal recovery module includes two second output ends; one second output end of each baseband signal recovery module is configured to output a baseband signal; and the other second output end is configured to output data enabling control information. The multiple-input multiple-output equalization module is configured to: control, based on N pieces of data enabling control information, a time sequence of N baseband signals entering the multiple-input multiple-output equalization module for equalization filtering processing, and perform equalization filtering processing on the N baseband signals by using N transmitters as references to obtain recovered data of the N transmitters. According to the embodiments of the present disclosure, asynchronous multi-transmitter data is received.

Abstract: A first optical splitter splits a light source to obtain a first optical signal, a second optical signal, and a third optical signal. A first MZ modulator modulates the first optical signal to output a fourth optical signal. A second MZ modulator modulates the second optical signal to output a fifth optical signal. A first optical coupler couples the fourth optical signal and the fifth optical signal to output a sixth optical signal and a seventh optical signal. A power regulator and a phase shifter respectively perform power adjustment and phase shifting on the third optical signal to output an eighth optical signal. A second optical splitter splits the eighth optical signal into a ninth optical signal and a tenth optical signal. A second optical coupler combines the sixth optical signal and the ninth optical signal. A third optical coupler combines the seventh optical signal and the tenth optical signal.

Abstract: According to a signal transmitting method, a signal receiving method, and a related device and system, a generated single-wavelength optical carrier may be split into N subcarriers with a same wavelength by using a splitting device, corresponding data modulation and corresponding amplitude spread spectrum modulation are performed on the N subcarriers by using N spreading codes and N low-speed data signals obtained by deserializing a received high-speed data signal, to obtain N spread spectrum modulation signals, and the N spread spectrum modulation signals are combined and output. A multicarrier generation apparatus or the like having a relatively complex structure does not need to be used for optical carrier splitting, and spectrum spreading does not need to be performed in a phase modulation manner in which a plurality of delay units or controllable phase units are required.

Abstract: Embodiments described and shown provide a signal transmission method, a signal receiving method, a related device, and a system. The signal transmission method includes: generating a single-wavelength optical carrier; splitting the single-wavelength optical carrier into N subcarriers having a same wavelength; generating a spreading code corresponding to each of the subcarriers to obtain N spreading codes, where a bandwidth of each of the spreading codes is less than or equal to a preset threshold; deserializing a to-be-transmitted data signal into N sub-data signals; modulating the N subcarriers based on the N sub-data signals and the N spreading codes, to obtain N modulation signals; and combining the N modulation signals into one combined signal, and outputting the combined signal.

Abstract: A data processing method includes performing first equalization processing on a data stream that comprises a plurality of sub-data stream segments, performing segment de-interleaving on the data stream, separately performing first forward error correction (FEC) decoding on each sub-data stream segment in a data stream, performing, according to an equalization termination state of each sub-data stream segment, second equalization processing on each sub-data stream segment, performing second FEC decoding on the data stream, and outputting the data stream obtained according to the second FEC decoding in response to a preset iteration termination condition being met, or performing, in response to the preset iteration termination condition not being met, according to the equalization termination state of each sub-data stream segment obtained according to the first equalization, the second equalization processing on each sub-data stream segment obtained according to the second FEC decoding.