138results about "Polarisation multiplex systems" patented technology

The invention discloses a method of an optical anti-turbulence device for polarization multiplexing spatial optical communication. The mode demultiplexer is connected with the optical fiber; the single-mode optical fiber array is respectively coupled with each spatial intrinsic mode decomposed by the mode demultiplexer; the polarization CBC chip is connected with the other end of the single-mode optical fiber array; the driving control module is connected with the polarization CBC chip; the polarization multiplexing optical communication digital coherent receiver (Rx) is connected with the polarization CBC chip through a single-mode optical fiber; through the arrangement of the polarization CBC chip, the compatibility of a polarization multiplexing technology and a mode multiplexing coherent beam combination technology is realized, the problem of polarization dimension information loss or strong crosstalk caused by the use of a polarization state rotator (PSR) and a polarization maintaining optical fiber in the prior art is solved, modulation information of two orthogonal polarization dimensions is completely reserved, the communication bandwidth is improved, and the communication efficiency is improved. And the communication efficiency is greatly improved.

An electro-optic receiver includes a bus optical waveguide and a plurality of wavelength division multiplexing (WDM) receiver slices positioned along the bus optical waveguide. Each of the plurality of WDM receiver slices includes a WDM element optically coupled to the bus optical waveguide, a photodetector, and a receiver circuit. The photodetector is optically connected to the WDM element by both a first optical connection and a second optical connection. The WDM element conveys a first component of input light through the first optical connection to the photodetector, and a second component of input light through the second optical connection to the photodetector, where first and second components of input light travel in opposite directions through the bus optical waveguide. The receiver circuit generates an electrical data signal from photocurrents received from the photodetector.

The present disclosure describes an optical system and method of operating the optical system. The optical system includes a substrate and first and second photonic integrated circuits. The first photonic integrated circuit is positioned on the substrate. The second photonic integrated circuit is positioned on the first photonic integrated circuit. The second photonic integrated circuit receives a first optical signal that includes a first mode and a second mode. The second photonic integrated circuit includes a polarization splitter rotator, a first demultiplexer, and a second demultiplexer. The polarization splitter rotator separates the first optical signal into a second optical with the first mode and a third optical signal with the first mode. The first and second demultiplexers separate the second and third optical signals into first and second pluralities of optical signals. The first and second pluralities of optical signals couple into the first photonic integrated circuit.

This control signal multiplexer comprises a modulation unit that uses a control signal to polarize and modulate an optical signal for conveying a main signal.

An optical system includes a first modulator configured to: receive first input light, modulate an amplitude of the first input light with a first data signal, modulate a phase of the first input light with a first marker signal, and output to an optical element, as first modulated light, the first input light modulated with the first data signal and the first marker signal. The optical system includes a second modulator configured to: receive second input light, modulate an amplitude of the second input light with a second data signal, modulate a phase of the second input light with a second marker signal, and output to the optical element, as second modulated light, the second input light modulated with the second data signal and the second marker signal. The second marker signal includes a complementary version of the first marker signal.

A circuit for bidirectional CWDM communication is provided. The circuit includes a polarization splitter rotator, and a first filter. The first filter is configured to demultiplex two or more respective wavelengths from an input signal split by the polarization splitter rotator. The first filter includes a first set of demultiplexer channels, and a first set multiplexer channels, wherein the first set of demultiplexer channels includes a first demultiplexer stage, the first demultiplexer stage including a first number of first component filters, and a second demultiplexer stage including a second number of second component filters having a second passband. The first set of multiplexer channels includes a first multiplexer stage including a third number of third component filters, and a second multiplexer stage including a fourth number of fourth component filters, wherein the third number is less than the first number, and fourth number is less than the second number.

This optical transmission system comprises: a phase conjugate conversion device (200) that performs optical parametric amplification in a first optical parametric amplification unit (238) and in a second optical parametric amplification unit (244), monitors electric power of a first polarized component and a second polarized component of first pilot light, controls the phase of higher harmonic wave excitation light by means of phase shifters (218, 224) so as to maximize the optical power of first pilot light to thereby synchronize the phase of the higher harmonic wave and the first pilot light, and controls a phase shifter (264) disposed in at least one path so as to maximize interference waveforms of respective components of second pilot light, which is different from the first pilot light in terms of the wavelength or the optical power and which has passed through from a pilot light source (270) in a reverse direction, to thereby match the optical length of the path of the first optical parametric amplification unit (238) and the path of the second optical parametric amplification unit (244); and a phase sensitive amplification device (400) for performing phase sensitive amplification on idler light and on an optical signal included in an optical transmission signal through optical parametric amplification using the excitation light controlled by using the first pilot light included in the optical transmission signal.

[Problem] To control according to the requirements of various communication services and transmit information via an appropriate communication network. [Solution] The present invention comprises: a line measurement unit 11 which measures line measurement information when performing line control based on line route information and line parameters for transmitting and receiving communication service data to and from an optical space communication device 2 which performs optical space communication via one or a plurality of lines mounted on a non-terrestrial node group and an optical ground station, on the basis of a service request and line measurement information on a plurality of lines, received from the non-terrestrial node group; a position calculation unit 13 which calculates position information on the non-terrestrial node group; a line parameter calculation unit 10 which calculates line route information and line parameters on the basis of the position information, a service request, and line measurement information; a line control unit 12 which controls a line on the basis of the line route information and the line parameters, for the optical space communication device 2; and a line information communication unit 14 which communicates the service request, the line measurement information, the line route information, and the line parameters with the non-terrestrial node group.

A method for reconstructing a first information stream and a second information stream, the method includes receiving, by an optical receiver, a received multiplexed optical signal that is a transmitted optical signal that passed through a polarization and phase rotating medium, the transmitted multiplexed optical signal being generated by using at least one transmitter phase-modulated periodical pilot signal, and by allocating a first polarization to the first information stream and a second polarization that differs from the first polarization to the second information stream; and processing the received multiplexed optical signal to provide a first reconstructed information stream and a second reconstructed information stream, wherein the processing comprises using at least one receiver phase-modulated periodical pilot signal that is associated with the at least one transmitter phase-modulated periodical pilot signal.

Optical multiplexers, optical demultiplexers, optical transmitters including the optical multiplexers, optical modules including the optical transmitters and the optical demultiplexers, and methods of using the same are disclosed. The optical multiplexers include first and second beam combiners, a polarizing beam combiner, and an optical isolator. The first and second beam combiners each include a reflective surface and at least one filter, and are configured to combine individual optical signals having the same polarization state into a multi-channel polarized optical signal. However, the two separate multi-channel polarized optical signals having different polarization states. The polarizing beam combiner includes one or more reflective surfaces and one or more polarization filters, and is configured to combine the multi-channel polarized optical signals into a multi-channel output signal. The optical demultiplexers are structurally similar to the optical multiplexers, but provide a complementary or reverse function.The present multiplexers and demultiplexers reduce the four-wave mixing effect.

This excitation light generation device comprises: a first multi-mode laser that outputs first excitation light; a second multi-mode laser that outputs second excitation light; a first excitation current / temperature controller that controls the temperature and excitation current of the first multi-mode laser; a second excitation current / temperature controller that controls the temperature and excitation current of the second multi-mode laser; a first polarization-maintaining variable optical attenuator that adjusts the intensity of light with the polarized state thereof maintained in linear polarization, and outputs the resulting light; a second polarization-maintaining variable optical attenuator that adjusts the intensity of light with the polarized state thereof maintained in linear polarization, and outputs the resulting light; and a polarization-multiplexing circuit that performs polarization-multiplexing and outputs the result. The first and second excitation current / temperature controllers perform control such that the longitudinal modes of the first excitation light and the second excitation light do not overlap. The first and second polarization-maintaining variable optical attenuators perform control so as to provide equal intensities.　

Provided is a signal processing device including: a batch adaptive equalization unit configured to use a first adaptive filter to perform an equalization process of waveform distortion on each polarized digital signal obtained by performing analog-to-digital conversion on a polarization-multiplexed signal; a matrix conversion unit configured to acquire filter coefficients of the first adaptive filter from at least the batch adaptive equalization unit, and convert acquired the filter coefficients through matrix operation; a degree-of-freedom separation adaptive equalization unit configured to use a second adaptive filter including the filter coefficients converted by the matrix conversion unit to perform an equalization process of waveform distortion due to polarization state fluctuation in a transmission path on each polarized digital signal; and a switching control unit configured to select a signal equalized by the batch adaptive equalization unit or the degree-of-freedom separation adaptive equalization unit as a reception signal.

An optical receiving device includes an optical coherent detecting unit (110) to cause an optical signal in which a plurality of channels is frequency-multiplexed to interfere with single interference light and perform coherent detection, and output an analog signal, an analog signal separating unit (130) to branch the analog signal from the optical coherent detecting unit (110) by the number of branches of N (N is a natural number of 2 or more) in a frequency domain, and output analog signals branched in the frequency domain as analog signals each of which is frequency-converted into a frequency equal to or lower than a set frequency, and an analog-digital converting unit (300) to perform analog-digital conversion on each of the analog signals branched by the analog signal separating unit (130) and converted into a low frequency, and output resultant signals as digital signals.

Transparent optical repeater for satellite, and communication satellite including such a repeater. This transparent optical repeater, configured for onboard use on a satellite, comprises: - an optical fiber (OF) assembly; - a first optical head (OHU1); - a first low-noise optical amplifier (LNOA); - a polarization splitter and controller (PCS) comprising, for each output channel of the bandpass filter (BPF), a channel polarization splitter and controller (C-PCS); - a third high-power optical amplifier (HPOA), per output channel of the polarization splitter and controller (PCS); - a polarization combination unit (PBC), configured to recombine the respective output channels of the two optical multiplexers (HPWDM); and - a second optical head (OHU2) configured to output the optical signals from the output of the polarization combination unit (PBC). Figure for the abstract: [Fig. 4]

To provide a multi-stage optical MIMO demultiplexer.SOLUTION: An optical polarization demultiplexer 200 is formed by: a polarization splitter and rotator (PBSR) 202; two 50 / 50 couplers 204 and 206; and two phase shifters 208 and 210. The two phase shifters 208 and 210 are controlled by another control signals Φ1212 and Φ2214. Each of the two phase shifters 208 and 210 is a differential phase shifter. The phase shifter 208 is mounted as an interferometer having two individual phase shift elements 208a and 208b that adjust an optical phase to one direction with one arm of an interferometer, and adjust an optical phase to an opposite direction with the other arm. The phase shifter 210 also has the same structure.SELECTED DRAWING: Figure 2

An optical receiver (100) includes: a polarization controller (102) arranged to receive a first modulated optical signal having a first polarization and an unmodulated optical carrier signal polarized and aligned with the first modulated optical signal as its input, the first modulated optical signal having a negligible spectral power density within a predetermined bandwidth BW around the spectrum of the unmodulated optical carrier signal; an optical filter device (104) having a primary polarization mode; and a coherent optical receiver device (106), wherein the polarization controller is arranged to apply a polarization rotation to the first modulated optical signal and the unmodulated optical carrier signal such that their polarizations are aligned with the primary polarization mode of the optical filter device, the optical filter device is arranged to receive and separate the unmodulated optical carrier signal from the first modulated optical signal, and the coherent optical receiver device is arranged to receive the separated signal and use the unmodulated optical carrier signal as a local oscillator (LO) signal to perform coherent detection of the first modulated optical signal.

The invention provides a wired transmission system and method. The wired transmission system comprises a sending unit, an optical coupling and multiplexing unit and a receiving unit, the sending unit comprises a first digital signal processor and a plurality of sub-sending units; the first digital signal processor is used for generating sub-electric signals according to the transmission data; the driving circuit of the sub-sending unit is used for controlling the light source to convert the sub-electric signal into a sub-optical signal in a preset polarization state; the optical coupling and multiplexing unit comprises a micro lens array and an optical waveguide; the micro-lens array is used for converging or collimating the sub-optical signals sent by the sub-sending units; the optical waveguides are used for transmitting the converged or collimated sub-optical signals to the sub-receiving units corresponding to the corresponding sub-sending units; the receiving unit comprises a second digital signal processor and a plurality of sub-receiving units; the receiver in the sub-receiving unit is used for converting a plurality of sub-optical signals transmitted through the optical waveguide into sub-electric signals; and the second digital signal processor is used for converting the plurality of sub-electric signals into transmission data.

Provided is a transmission device comprising: a polarization time block coding unit that performs space-time coding with respect to a transmission signal, thereby generating a polarization phase modulation signal; a quadrature phase signal generation unit that generates, for each polarized wave, a quadrature phase signal of a dual polarization phase modulation signal generated by the polarization time block coding unit; and a transmission unit that alternately transmits the dual polarization phase modulation signal and the quadrature phase signal of each polarized wave on the time axis.　

Optical communication devices and associated methods of manufacturing are provided. An example optical communication device includes a substrate defining a first end and a second end. The optical communication device also includes a primary optical communication medium attached to the second end and a secondary optical communication medium attached to the second end. The optical communication device further includes a signal preclusion component supported by the substrate that selectively preclude signal transmission of optical signals received via the first end to either the primary optical communication medium or the secondary optical communication medium.

The invention relates to the field of silicon-based optoelectronic integration, and particularly discloses an on-chip adaptive wave combination method and feedback system for a polarization diversity MZM, and the system comprises an optical coupling and mode conversion module, a polarization diversity electro-optical modulation module, an optical power collection and photoelectric conversion module, a signal processing and feedback control module, and a tunable wave combination module. After coupling conversion and modulation, two paths of optical power are collected and subjected to photoelectric conversion, a power difference voltage is obtained through an analog circuit, a bias voltage is superposed to generate a control voltage, and an adjustable combiner is driven to dynamically adjust the beam splitting ratio to complete wave combination. The problems that the output power of the polarization diversity MZM fluctuates randomly along with the polarization state, and an existing polarization control scheme is slow in response, complex in architecture and difficult to integrate with a silicon-based process are solved, real-time accurate compensation of power fluctuation is achieved, it is guaranteed that the combined wave output power is stable, the system architecture is simple, power consumption is low, integration with a silicon-based chip monolithic chip is easy, and the application range is wide. And the performance and the compatibility of the integrated photonic link are improved.

An optical signal processing device includes: a polarization separator that separates an input polarization multiplexed signal; an optical coupler that branches one polarization component; an optical coupler that branches another polarization component; optical filters to which the one polarization component branched by the optical coupler is input; optical filters to which the other polarization component branched by the optical coupler is input; an optical coupler that multiplexes outputs of the optical filters; an optical coupler that multiplexes outputs of the optical filters; and a tap coefficient update unit that adaptively sets tap coefficients of the optical filters to separate a polarization multiplexed signal.

One embodiment includes an optical communication channel, a first network device connected to a first end of the optical communication channel, and a second network device connected to a second end of the optical communication channel. At least one of the first network device or the second network device performs polarization tracking of packets of polarization multiplexed bidirectional communications through the optical communication channel.

A self-homodyne detection coherent transceiver includes a first analog adaptive polarization controller (APC) configured to split the remotely sent local oscillator signal into two portions, including a first remotely sent local oscillator signal and a second remotely sent local oscillator signal; a second analog APC configured to split a polarization multiplexed signal into a first data signal and a second data signal; an analog adaptive phase rotator (APR) coupled to an output of the first analog APC, the analog APR configured to control respective phases of the first remotely sent local oscillator signal and the second remotely sent local oscillator signal for carrier phase error compensation; and a 4-level pulse amplitude modulation (PAM4) digital signal processor (DSP) chip coupled to outputs of a coherent receiver, which includes the first analog APC, the second analog APC, and the analog APR followed by a coherent receiver circuit.

Disclosed are an optical multiplexer (100, 100 ', 200, 200'), an optical demultiplexer, an optical transmitter comprising the optical multiplexer (100, 100 ', 200, 200'), an optical module comprising the optical transmitter and the optical demultiplexer, and methods of using the same. An optical multiplexer (100, 100 ', 200, 200') includes first and second beam combiners (110, 120), a polarized beam combiner (130), and an optical isolator (140). The first and second beam combiners (110, 120) each comprise a reflective surface and at least one optical filter for combining individual optical signals having the same polarization state into a multi-channel polarized optical signal. However, the two independent multi-channel polarized light signals have different polarization states. The polarized light beam combiner (130) comprises one or more reflecting surfaces and one or more polarization filters, and is used for combining the multi-channel polarized light signals into multi-channel output signals. The structure of the optical demultiplexer is similar to that of the optical multiplexer (100, 100 ', 200, 200'), but provides complementary or opposite functions. According to the multiplexer and the demultiplexer, the four-wave mixing effect is reduced.

We provide a transmissive optical repeater. [Solution] The transmissive optical repeater of the present disclosure is configured to be incorporated into a satellite and comprises a set of optical fibers (FO), a first optical head (OHU1), a low-noise optical amplifier (LNOA), a polarization separation controller (PCS) having a channel polarization separation controller (C-PCS) for each output channel of an optical bandpass filter (BPF), a high-power optical amplifier (HPOA) for each output channel of the polarization separation controller (PCS), a quadrature polarization coupler (PBC) configured to recombine the two output channels of each of two high-power optical multiplexers (HPWDM), and a second optical head (OHU2) configured to transmit the output optical signal of the quadrature polarization coupler (PBC).

This application discloses a transmission method for optical communication. The method is applicable to multiple scenarios exceeding 400Gbps (including 600Gbps, 800Gbps, etc.), such as metropolitan area networks, backbone networks, and data center interconnects. The method includes the steps of generating a frame including a plurality of symbols, in one polarization direction, the frame being N FAW Frame alignment word symbols, N PS pilot symbols, and N RES reserved symbols, one symbol out of every M symbols in the frame is a pilot symbol, and N FAW +N RES =M or N FAW +N RES +1=M, and each of the frame alignment word symbols and pilot symbols is one of -A-Aj, -A+Aj, A-Aj, and A+Aj, where A is a real number, and transmitting the frame.

The application discloses a kind of optical anti-turbulence devices of polarization multiplexing space optical communication method, it is characterized in that: it further includes mode demultiplexer connected with optical fiber, single-mode fiber array respectively coupled with each spatial eigenmode after mode demultiplexer decomposition, polarization CBC chip connected with the other end of single-mode fiber array, drive control module connected with polarization CBC chip and polarization multiplexing optical communication digital coherent receiver (Rx) connected with polarization CBC through single-mode fiber;The application is realized by the setting of polarization CBC chip, the compatibility of polarization multiplexing technology and mode multiplexing coherent beam combination technology, breaks down the polarization dimension information loss or strong crosstalk problem caused by polarization state rotator (PSR) and polarization maintaining optical fiber in the prior art, retains the modulation information of two orthogonal polarization dimensions completely, improves communication bandwidth, and greatly improves communication efficiency.