CN110460387A - A kind of coherent receiver, optical communication system and light signal detection method - Google Patents
A kind of coherent receiver, optical communication system and light signal detection method Download PDFInfo
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- CN110460387A CN110460387A CN201910673223.7A CN201910673223A CN110460387A CN 110460387 A CN110460387 A CN 110460387A CN 201910673223 A CN201910673223 A CN 201910673223A CN 110460387 A CN110460387 A CN 110460387A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
- H04B10/61—Coherent receivers
- H04B10/615—Arrangements affecting the optical part of the receiver
- H04B10/6151—Arrangements affecting the optical part of the receiver comprising a polarization controller at the receiver's input stage
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
- H04B10/61—Coherent receivers
- H04B10/616—Details of the electronic signal processing in coherent optical receivers
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Abstract
The present invention relates to technical field of photo communication more particularly to a kind of coherent receivers, optical communication system and light signal detection method.Coherent receiver of the invention parses four parsing carrier wave optical signals by palarization multiplexing demodulator, coupling optical path is handled according to four parsing carrier wave optical signals, the exit direction of the parsing carrier wave optical signal of adjustment four, four parsing carrier light signal photoelectricity after adjustment exit direction are converted into current signal by photodetector, current signal is processed into voltage signal by signal amplifier, voltage signal is processed into digital signal by analog-digital converter, digital signal processor is demodulated to obtain demodulated signal corresponding with four parsing carrier wave optical signals, to complete the demodulation of carrier signal.Entire demodulating process is simple, is not required to integrate many devices such as PBS, frequency mixer, balanced reciver in relevant optical module to realize coherent signal demodulation, integrated level is high, easily minimizes, at low cost.
Description
Technical field
The present invention relates to technical field of photo communication more particularly to a kind of coherent receivers, optical communication system and optical signal inspection
Survey method.
Background technique
In the long range coherent optical communication system of existing mainstream commercialization, carrier signal generallys use high-order complex modulation lattice
Formula, such as quadrature phase shift keying (QPSK), 16 quartile quadrature amplitude modulations (16QAM) are thus visited in receiving end using relevant
Survey method isolates the amplitude and phase information of signal.Basic principle is as shown in Figure 1, first with polarization beam apparatus reception
The TE (electric field oscillation direction vertical incidence face) and TM (electric field oscillation direction is in the plane of incidence) polarization mode of optical signal are separated, if
Then TE the and TM polarized component beat frequency setting a local oscillator light source and isolating includes vibration using balanced reciver output
The electric signal of width and phase realizes high order modulation coherent light signal after special DSP (digital signal processor) processing
Demodulation.Current mainstream scheme demodulation logic is complicated, and PBS (polarization beam apparatus) need to be integrated in relevant optical module, frequency mixer, is put down
The many devices such as receiver, ADC (analog-digital converter), DSP that weigh realize coherent signal demodulation, lead to high costs, device architecture
The deficiencies of complexity, miniaturization difficult, DSP must be external.Therefore, it develops a kind of without external local oscillator light source, frequency mixer, balance
The devices such as receiver, and the high coherent receiver of integrated level is particularly important.
Summary of the invention
Based on this, it is necessary in view of the above-mentioned problems, proposing a kind of coherent receiver, optical communication system and optical signal detecting
Method.
In a first aspect, the invention proposes a kind of coherent receivers, comprising:
Palarization multiplexing demodulator is parsed for receiving carrier signal according to carrier signal, and four parsing carrier waves are obtained
Optical signal, four parsing carrier wave optical signals refer to four polarized components differences and coplanar carrier signal, the carrier wave
Signal refers to the optical signal for modulated signal being modulated at the carrying modulated signal generated in modulated light source；
Coupling optical path for changing four transmission directions for parsing carrier wave optical signal and carries out optical coupled；
Photodetector, for receiving four parsing carrier wave optical signals after adjusting exit direction, according to four institutes
It states parsing carrier wave optical signal and carries out photoelectric conversion, obtain current signal corresponding with four parsing carrier wave optical signals；
Signal amplifier obtains and four for being handled according to four corresponding current signals of parsing carrier wave optical signal
The corresponding voltage signal of a parsing carrier wave optical signal；
Analog-digital converter obtains and four for being handled according to four corresponding voltage signals of parsing carrier wave optical signal
The corresponding digital signal of a parsing carrier wave optical signal；
Digital signal processor is obtained for being demodulated according to four corresponding digital signals of parsing carrier wave optical signal
Demodulated signal corresponding with four parsing carrier wave optical signals, four corresponding demodulated signals of parsing carrier wave optical signal are the carrier wave
The modulated signal being modulated in signal in modulated light source.
In one embodiment, the coherent receiver further include:
Optical splitter, for the carrier signal to be divided into two beams, a branch of in carrier signal described in two beams is exported to described
Palarization multiplexing demodulator；
Monitoring detector obtains optical power for another Shu Jinhang detection in the carrier signal according to two beams；
Controller, for obtaining preset optical power threshold, when the optical power that the monitoring detector detects is lower than institute
The analog-digital converter is then controlled when stating preset optical power threshold and the digital signal processor stops working.
In one embodiment, the coherent receiver further include:
Coupling unit is focused, for output after four parsing carrier wave optical signals are focused coupling to the photoelectricity
Detector.
In one embodiment, the palarization multiplexing demodulator is based on the realization of Stokes domain depolarization multiplexing technology to institute
State the parsing of carrier signal.
In one embodiment, angle is identical between the exit direction of the two neighboring parsing carrier wave optical signal.
In one embodiment, the coupling optical path includes multi-panel lens.
In one embodiment, the light letter for modulated signal being modulated at the carrying modulated signal generated in modulated light source
Number, it specifically includes: by quadrature phase shift keying, eight quartile quadrature amplitudes, 16 quartile quadrature amplitudes, the orthogonal width of 60 quartiles
Any mode in degree is modulated at modulated signal the optical signal of the carrying modulated signal generated in modulated light source.
In one embodiment, the coherent receiver further includes pedestal, the palarization multiplexing demodulator, the coupling light
Road, the photodetector, the signal amplifier are mounted on the base, and the pedestal uses temperature-resistant material
Material is made.
Second aspect, the invention also provides a kind of light signal detection methods, which comprises
Receive carrier signal；
It is parsed according to carrier signal, obtains four parsing carrier wave optical signals, four parsing carrier wave optical signals are
Refer to four polarized components differences and coplanar carrier signal, the carrier signal, which refers to, is modulated at modulated light source modulated signal
The optical signal of the carrying modulated signal of upper generation；
It is handled according to four parsing carrier wave optical signals, the outgoing side of the parsing carrier wave optical signal of adjustment four
To；
Four parsing carrier wave optical signals after receiving adjustment exit direction；
Photoelectric conversion is carried out according to four parsing carrier wave optical signals, is obtained corresponding with four parsing carrier wave optical signals
Current signal；
It is handled, is obtained and four parsing carrier wave optical signals according to four corresponding current signals of parsing carrier wave optical signal
Corresponding voltage signal；
It is handled, is obtained and four parsing carrier wave optical signals according to four corresponding voltage signals of parsing carrier wave optical signal
Corresponding digital signal；
It is demodulated, is obtained and four parsing carrier wave optical signals according to four corresponding digital signals of parsing carrier wave optical signal
Corresponding demodulated signal, four corresponding demodulated signals of parsing carrier wave optical signal are to be modulated at modulated light source in the carrier signal
On modulated signal.
Second aspect, the invention also provides a kind of optical communication system, including transmitter and receiver, transmitter is used for light
Modulated carrier signal is transmitted to receiver through transmission link by the precoding and modulation of signal, and the receiver includes the
On the one hand described in any item coherent receivers.
Believe in conclusion coherent receiver of the invention parses four parsing carrier lights by palarization multiplexing demodulator
Number, coupling optical path is handled according to four parsing carrier wave optical signals, and the parsing carrier wave optical signal of adjustment four goes out
Direction is penetrated, four parsing carrier light signal photoelectricity after adjustment exit direction are converted by photodetector by current signal,
Current signal is processed into voltage signal by signal amplifier, and voltage signal is processed into digital signal, number letter by analog-digital converter
Number processor is demodulated to obtain demodulated signal corresponding with four parsing carrier wave optical signals, to complete the solution of carrier signal
It adjusts.Entire demodulating process is simple, is not required to many devices such as integrated PBS, frequency mixer, balanced reciver in relevant optical module and comes in fact
Existing coherent signal demodulation, integrated level is high, easily minimizes, at low cost.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Wherein:
Fig. 1 is the demodulation operation principle schematic diagram of high order modulation coherent light signal in background technique；
Fig. 2 is the structural schematic diagram of coherent receiver in one embodiment；
Fig. 3 is the coherent receiver operation principle schematic diagram of Fig. 2；
Fig. 4 is the flow chart of light signal detection method in one embodiment；
Fig. 5 is the structural schematic diagram of optical communication system in one embodiment.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
As shown in Fig. 2, in one embodiment, the present invention provides a kind of coherent receivers 100, comprising:
Palarization multiplexing demodulator 201 is parsed for receiving carrier signal according to carrier signal, and four parsings are obtained
Carrier wave optical signal, four parsing carrier wave optical signals refer to four polarized components differences and coplanar carrier signal, described
Carrier signal refers to the optical signal for modulated signal being modulated at the carrying modulated signal generated in modulated light source；
Coupling optical path 202, for being handled according to four parsing carrier wave optical signals, the parsing of adjustment four is carried
The exit direction of wave optical signal；
Photodetector 203, for receiving four parsing carrier wave optical signals after adjusting exit direction, according to four
The parsing carrier wave optical signal carries out photoelectric conversion, obtains current signal corresponding with four parsing carrier wave optical signals；
Signal amplifier 204, for being handled according to four corresponding current signals of parsing carrier wave optical signal, obtain with
Four corresponding voltage signals of parsing carrier wave optical signal；
Analog-digital converter 205, for being handled according to four corresponding voltage signals of parsing carrier wave optical signal, obtain with
Four corresponding digital signals of parsing carrier wave optical signal；
Digital signal processor 206 is obtained for being demodulated according to four corresponding digital signals of parsing carrier wave optical signal
To demodulated signal corresponding with four parsing carrier wave optical signals, four corresponding demodulated signals of parsing carrier wave optical signal are the load
The modulated signal being modulated in wave signal in modulated light source.
Fig. 3 shows 100 working principle diagram of coherent receiver of the present embodiment, the embodiment of the present invention coherent receiver
100 parse four parsing carrier wave optical signals by palarization multiplexing demodulator 201, and coupling optical path 202 is according to four parsings
Carrier wave optical signal is handled, the exit direction of the parsing carrier wave optical signal of adjustment four, by photodetector 203 tune
Four parsing carrier light signal photoelectricity after whole exit direction are converted into current signal, and signal amplifier 204 is at current signal
Voltage signal is managed into, voltage signal is processed into digital signal by analog-digital converter 205, and digital signal processor 206 is demodulated
Demodulated signal corresponding with four parsing carrier wave optical signals is obtained, to complete the demodulation of carrier signal.Entire demodulating process letter
It is single, be not required to integrate in relevant optical module PBS, frequency mixer, balanced reciver, etc. many devices realize coherent signal demodulation,
Integrated level is high, easily minimizes, at low cost.The phase of the 100Gbps of the compatible current main-stream of the embodiment of the present invention coherent receiver 100
Dry optical communication system, and it is equally applicable to following 400Gbps/800Gbps/1Tbps coherent optical communication system, be conducive to structure
Build extensive D (wdm) communications network.
The signal amplifier 204 can select trans-impedance amplifier (TIA) from the prior art, illustrate do not limit herein
It is fixed.
The photodetector 203 can select photodiode detector from the prior art, illustrate do not limit herein
It is fixed.
205 quantity of analog-digital converter is 4, for respectively to four corresponding voltage signals of parsing carrier wave optical signal
It is handled.
The analog-digital converter 205, the digital signal processor 206 can select from the prior art, specific structure
Therefore not to repeat here for principle.
The modulated light source includes: coherent light or mixed light.Coherent light refers on the arbitrary point in time or space, especially
It is in a region on the plane perpendicular to the direction of propagation of light, or in institute's having time of a specified point in space,
All parameters of light can predict and relevant light, i.e., all light is parallel to same propagation axis, form superfine, height and gather
Burnt light beam.Mixed light includes the light that coherent light and PAM4 signal mix, PAM (Pulse Amplitude
Modulation, pulse amplitude modulation) signal is a kind of popular signal transmission that high speed signal interconnection is done at further generation data center
Technology, can be widely applied to the transmission of the electric signal or optical signal of 200G/400G interface, and PAM4 is the one of PAM modulation technique
Kind, PAM4 carries out signal transmission using 4 different signal levels, and each symbol period can indicate the logic letter of 2 bit
It ceases (0,1,2,3), citing is not especially limited herein.
In one embodiment, the coherent receiver 100 further include: optical splitter 105, for the carrier signal point
At two beams, a branch of in carrier signal described in two beams is exported to the palarization multiplexing demodulator 201；Monitoring detector 106, is used for
According to another Shu Jinhang detection in carrier signal described in two beams, optical power is obtained；Controller, for obtaining preset optical power
Threshold value then controls the mould when the optical power that the monitoring detector 106 detects is lower than the preset optical power threshold
Number converter 205 and the digital signal processor 206 stop working.It is understood that the two-beam that optical splitter 105 separates
Can it is identical, can also be different, be not specifically limited herein.The optical splitter 105, monitoring detector 106 can be from existing skills
It selects in art, is not specifically limited herein.Controller is lower than preset optical power threshold according to the testing result of monitoring detector 106
The analog-digital converter 205 is controlled when value and the digital signal processor 206 stops working.For example, the preset smooth function
Rate threshold value is 1 milliwatt, and citing is not especially limited herein.
The controller can use PLC (programmable logic controller (PLC), Programmable Logic Controller)
And/or FPGA (field programmable gate array, Field Programmable Gate Array), it illustrates do not make to have herein
Body limits.
In one embodiment, the coherent receiver 100 further include: coupling unit is focused, for four solutions
Output is to the photodetector 203 after analysis carrier wave optical signal is focused coupling.By believing four parsing carrier lights
Number focusing coupling, thus reduce photodetector 203 receive it is described parsing carrier wave optical signal light admitting aperture bore dia, from
And reduce the size of photodetector 203, be conducive to the miniaturization of coherent receiver 100.The focusing coupling unit can be with
It selects 4 lens for being focused coupling to four parsing carrier wave optical signals respectively from the prior art, illustrates herein
It is not especially limited.
In one embodiment, the light admitting aperture that photodetector 203 receives the parsing carrier wave optical signal is located at described
In the focus for focusing coupling unit, so that light admitting aperture can completely be made to receive the parsing carrier wave optical signal, improve to institute
State the accuracy of detection and the demodulation of parsing carrier wave optical signal.
In one embodiment, the palarization multiplexing demodulator 201 is realized based on Stokes domain depolarization multiplexing technology
Parsing to the carrier signal obtains four polarized components differences and coplanar carrier signal.Stokes domain depolarization
Multiplexing technology is original to recover to find out an inverse matrix the characteristics of Stokes domain is distributed using polarisation-multiplexed signal
Polarization state, the depolarization multiplexing method based on Stokes domain can tolerate dispersion and Polarization Dependent Loss, and implementation can
To select from the prior art, therefore not to repeat here.
In one embodiment, angle is identical between the exit direction of the two neighboring parsing carrier wave optical signal.For example,
Angle α, all 40 ° of β, γ between the exit direction of the two neighboring parsing carrier wave optical signal, illustrating herein, it is specific not do
It limits.To be conducive to the processing of palarization multiplexing demodulator 201, production cost is reduced.
In another embodiment, angle difference or portion between the exit direction of the two neighboring parsing carrier wave optical signal
Split-phase is same.For example, angle α is 40 ° between the exit direction of the two neighboring parsing carrier wave optical signal, β is 50 °, γ is
45 °, citing is not specifically limited herein.
In one embodiment, α, β, γ are added less than 180 °, facilitate the peace of the other component of coherent receiver 100
Dress, to be conducive to the miniaturization of coherent receiver 100.It is understood that α, β, γ addition can also be greater than or equal to
180 °, citing is not especially limited herein.
In one embodiment, the coupling optical path 202 includes multi-panel lens, and the multi-panel lens are for making palarization multiplexing
Four parsing carrier wave optical signals that the exit direction that demodulator 201 parses is intersected with angle are by refraction at outgoing side
To four parallel parsing carrier wave optical signals, the transmission direction for changing four parsing carrier wave optical signals is to go out in parallel
It penetrates.The exit direction of four parsing carrier wave optical signals facilitates the installation of the other component of coherent receiver 100 in parallel, from
And be conducive to the miniaturization of coherent receiver 100.
In another embodiment, the coupling optical path 202 includes four single side lens, and each single side lens are for reflecting
One parsing carrier wave optical signal, so that four parsing carrier wave optical signals be made to show that penetrate direction parallel.
In another embodiment, the coupling optical path 202 includes a single side lens, a multi-panel lens or described
Coupling optical path 202 includes that two single side lens, a multi-panel lens or the coupling optical path 202 include two single side lens, is used
Passed through in the exit direction for parsing palarization multiplexing demodulator 201 with four parsing carrier wave optical signals that angle intersects
Reflect into four parallel parsing carrier wave optical signals of exit direction.
It is understood that the coupling optical path 202 can also use other optical components, it is not specifically limited herein.
In one embodiment, the light letter for modulated signal being modulated at the carrying modulated signal generated in modulated light source
Number, it specifically includes: by quadrature phase shift keying (QPSK), eight quartile quadrature amplitudes (8QAM), 16 quartile quadrature amplitudes
Any mode in (16QAM), 60 quartile quadrature amplitudes (64QAM), which is modulated at modulated signal in modulated light source, to be generated
Carrying modulated signal optical signal.It is understood that other modulation systems can also be used, illustrates do not limit specifically herein
It is fixed.
In one embodiment, the coherent receiver 100 further includes pedestal 111, the palarization multiplexing demodulator 201,
The coupling optical path 202, the photodetector 203, the signal amplifier 204 are mounted on the pedestal 111, the bottom
Seat 111 is made of temperature-resistant material.For example, the temperature-resistant aluminium nitride of the use of pedestal 111,
At least one of kovar (teleoseal), ceramics are made, and citing is not especially limited herein.Using to temperature-insensitive
Material pedestal 111 is made, to extend the service life of coherent receiver 100.
In one embodiment, the analog-digital converter 205, the digital signal processor 206 are located at PCB (printing electricity
Road plate) on.
It is understood that the coherent receiver 100 further includes shell, the palarization multiplexing demodulator 201, described stated
Coupling optical path 202, the photodetector 203, the signal amplifier 204, the pedestal 111, the analog-digital converter
205, the digital signal processor 206 is located in the shell, thus be conducive to protect the components of coherent receiver 100,
Extend the service life of coherent receiver 100.
As shown in figure 4, in one embodiment, the present invention also provides a kind of light signal detection method, the method packets
It includes:
S402, carrier signal is received；
S404, it is parsed according to carrier signal, obtains four parsing carrier wave optical signals, four parsing carrier light letters
Number refer to that four polarized components are different and coplanar carrier signal, the carrier signal, which refers to, is modulated at modulation modulated signal
The optical signal of the carrying modulated signal generated on light source；
S406, it is handled according to four parsing carrier wave optical signals, the parsing carrier wave optical signal of adjustment four
Exit direction；
S408, four parsing carrier wave optical signals after adjustment exit direction are received；
S410, photoelectric conversion is carried out according to four parsing carrier wave optical signals, obtained and four parsing carrier wave optical signals
Corresponding current signal；
S412, it is handled, is obtained and four parsing carrier waves according to four corresponding current signals of parsing carrier wave optical signal
The corresponding voltage signal of optical signal；
S414, it is handled, is obtained and four parsing carrier waves according to four corresponding voltage signals of parsing carrier wave optical signal
The corresponding digital signal of optical signal；
S416, it is demodulated, is obtained and four parsing carrier waves according to four corresponding digital signals of parsing carrier wave optical signal
The corresponding demodulated signal of optical signal, four corresponding demodulated signals of parsing carrier wave optical signal are to be modulated in the carrier signal
Modulated signal on light source processed.
The light signal detection method of the present embodiment parses four parsing carrier light letters by palarization multiplexing demodulator 201
Number, coupling optical path 202 is handled according to four parsing carrier wave optical signals, the parsing carrier wave optical signal of adjustment four
Four parsing carrier light signal photoelectricity after adjustment exit direction are converted into electric current by photodetector 203 by exit direction
Current signal is processed into voltage signal by signal, signal amplifier 204, and voltage signal is processed into number by analog-digital converter 205
Signal, digital signal processor 206 is demodulated to obtain demodulated signal corresponding with four parsing carrier wave optical signals, to complete
The demodulation of carrier signal.Entire demodulating process is simple, be not required to integrate in relevant optical module PBS, frequency mixer, balanced reciver,
Coherent signal demodulation is realized etc. many devices, integrated level is high, easily minimizes, at low cost.
As shown in figure 5, in one embodiment, the present invention also provides a kind of optical communication systems, including 500 He of transmitter
Receiver, transmitter 500 are used for the precoding and modulation of optical signal, modulated carrier signal are transmitted to through transmission link and is connect
Receipts machine, the receiver include coherent receiver 100.The coherent receiver 100 includes:
Palarization multiplexing demodulator 201 is parsed for receiving carrier signal according to carrier signal, and four parsings are obtained
Carrier wave optical signal, four parsing carrier wave optical signals refer to four polarized components differences and coplanar carrier signal, described
Carrier signal refers to the optical signal for modulated signal being modulated at the carrying modulated signal generated in modulated light source；
Coupling optical path 202, for being handled according to four parsing carrier wave optical signals, the parsing of adjustment four is carried
The exit direction of wave optical signal；
Photodetector 203, for receiving four parsing carrier wave optical signals after adjusting exit direction, according to four
The parsing carrier wave optical signal carries out photoelectric conversion, obtains current signal corresponding with four parsing carrier wave optical signals；
Signal amplifier 204, for being handled according to four corresponding current signals of parsing carrier wave optical signal, obtain with
Four corresponding voltage signals of parsing carrier wave optical signal；
Analog-digital converter 205, for being handled according to four corresponding voltage signals of parsing carrier wave optical signal, obtain with
Four corresponding digital signals of parsing carrier wave optical signal；
Digital signal processor 206 is obtained for being demodulated according to four corresponding digital signals of parsing carrier wave optical signal
To demodulated signal corresponding with four parsing carrier wave optical signals, four corresponding demodulated signals of parsing carrier wave optical signal are the load
The modulated signal being modulated in wave signal in modulated light source.
The transmitter 500 includes: arbitrary waveform generator 502, light source generator 501, I/Q modulator 503, IQ modulation
What modulated signal (XI, XQ, the YI, YQ) adjustment that device 503 generates arbitrary waveform generator 502 was generated in light source generator 501
Obtain carrier signal on coherent light or mixed light, coherent receiver 100 restored after parsing demodulation modulated signal (XI, XQ,
YI, YQ), to realize communication.The arbitrary waveform generator 502 can select from the prior art, light source generator 501
It can choose the laser for generating coherent light, the I/Q modulator 503 can choose 100G I/Q modulator 503, illustrate herein not
Make specific limit.XI is that X signal light same-phase exports, XQ is that X signal light quadrature phase exports, YI is that Y-signal light same-phase is defeated
Out, YQ is the output of Y-signal light quadrature phase.
In one embodiment, arbitrary waveform generator 502, light source generator 501, I/Q modulator 503 are integrated in one
Become transmitter 500 in equipment；In another embodiment, arbitrary waveform generator 502, light source generator 501, I/Q modulator
503 manufacture into independent equipment respectively, and the function of transmitter 500 is realized in the work that is fitted to each other.
The coherent receiver 100 of the optical communication system of the present embodiment parses four solutions by palarization multiplexing demodulator 201
Carrier wave optical signal is analysed, coupling optical path 202 is handled according to four parsing carrier wave optical signals, and the parsing of adjustment four carries
The exit direction of wave optical signal, by photodetector 203 four parsing carrier light signal photoelectricity after adjustment exit direction
It is converted into current signal, current signal is processed into voltage signal by signal amplifier 204, and analog-digital converter 205 is voltage signal
It is processed into digital signal, digital signal processor 206 is demodulated to obtain demodulation letter corresponding with four parsing carrier wave optical signals
Number, to complete the demodulation of carrier signal.Entire demodulating process is simple, be not required to integrate in relevant optical module PBS, frequency mixer,
Many devices such as balanced reciver realize coherent signal demodulation, and integrated level is high, easily minimizes, at low cost.
It should be noted that a kind of above-mentioned coherent receiver 100, a kind of optical communication system, a kind of light signal detection method
Belong to a total inventive concept, a kind of coherent receiver 100, a kind of optical communication system, a kind of light signal detection method are implemented
Content in example can be mutually applicable in.
Each technical characteristic of above embodiments can be combined arbitrarily, for simplicity of description, not to above-described embodiment
In each technical characteristic it is all possible combination be all described, as long as however, the combination of these technical characteristics be not present lance
Shield all should be considered as described in this specification.
The several embodiments of the application above described embodiment only expresses, the description thereof is more specific and detailed, but simultaneously
The limitation to the application the scope of the patents therefore cannot be interpreted as.It should be pointed out that for those of ordinary skill in the art
For, without departing from the concept of this application, various modifications and improvements can be made, these belong to the guarantor of the application
Protect range.Therefore, the scope of protection shall be subject to the appended claims for the application patent.
Claims (10)
1. a kind of coherent receiver characterized by comprising
Palarization multiplexing demodulator is parsed for receiving carrier signal according to carrier signal, and four parsing carrier light letters are obtained
Number, four parsing carrier wave optical signals refer to four polarized components differences and coplanar carrier signal, the carrier signal
Refer to the optical signal for modulated signal being modulated at the carrying modulated signal generated in modulated light source；
Coupling optical path, for being handled according to four parsing carrier wave optical signals, the parsing carrier light letter of adjustment four
Number exit direction；
Photodetector, for receiving four parsing carrier wave optical signals after adjusting exit direction, according to four solutions
It analyses carrier wave optical signal and carries out photoelectric conversion, obtain current signal corresponding with four parsing carrier wave optical signals；
Signal amplifier obtains solving with four for being handled according to four corresponding current signals of parsing carrier wave optical signal
Analyse the corresponding voltage signal of carrier wave optical signal；
Analog-digital converter obtains solving with four for being handled according to four corresponding voltage signals of parsing carrier wave optical signal
Analyse the corresponding digital signal of carrier wave optical signal；
Digital signal processor obtains and four for being demodulated according to four corresponding digital signals of parsing carrier wave optical signal
The corresponding demodulated signal of a parsing carrier wave optical signal, four corresponding demodulated signals of parsing carrier wave optical signal are the carrier signal
In be modulated at modulated signal in modulated light source.
2. coherent receiver according to claim 1, which is characterized in that the coherent receiver further include:
Optical splitter, for the carrier signal to be divided into two beams, a branch of in carrier signal described in two beams is exported to the polarization
Demodulator；
Monitoring detector obtains optical power for another Shu Jinhang detection in the carrier signal according to two beams；
Controller, for obtaining preset optical power threshold, when the optical power that the monitoring detector detects is lower than described pre-
If optical power threshold when then control the analog-digital converter and the digital signal processor stops working.
3. coherent receiver according to claim 1, which is characterized in that the coherent receiver further include:
Coupling unit is focused, for output after four parsing carrier wave optical signals are focused coupling to the photodetection
Device.
4. coherent receiver according to claim 1, which is characterized in that the palarization multiplexing demodulator is based on Stokes
Domain depolarization multiplexing technology realizes the parsing to the carrier signal.
5. coherent receiver according to any one of claims 1 to 4, which is characterized in that the two neighboring parsing carrier wave
Angle is identical between the exit direction of optical signal.
6. coherent receiver according to claim 5, which is characterized in that the coupling optical path includes multi-panel lens.
7. coherent receiver according to claim 5, which is characterized in that described that modulated signal is modulated in modulated light source
The optical signal of the carrying modulated signal of generation, specifically includes: passing through quadrature phase shift keying, eight quartile quadrature amplitudes, 16 quartiles
Any mode in quadrature amplitude, 60 quartile quadrature amplitudes is modulated at modulated signal the carrying generated in modulated light source
The optical signal of modulated signal.
8. coherent receiver according to claim 5, which is characterized in that the coherent receiver further includes pedestal, described
Palarization multiplexing demodulator, the coupling optical path, the photodetector, the signal amplifier are mounted on the base, institute
Pedestal is stated to be made of temperature-resistant material.
9. a kind of light signal detection method, which comprises
Receive carrier signal；
It is parsed according to carrier signal, obtains four parsing carrier wave optical signals, four parsing carrier wave optical signals refer to four
A polarized component difference and coplanar carrier signal, the carrier signal, which refers to, is modulated at life in modulated light source modulated signal
At carrying modulated signal optical signal；
It is handled according to four parsing carrier wave optical signals, the exit direction of the parsing carrier wave optical signal of adjustment four；
Four parsing carrier wave optical signals after receiving adjustment exit direction；
Photoelectric conversion is carried out according to four parsing carrier wave optical signals, obtains electric current corresponding with four parsing carrier wave optical signals
Signal；
It is handled, is obtained corresponding with four parsing carrier wave optical signals according to four corresponding current signals of parsing carrier wave optical signal
Voltage signal；
It is handled, is obtained corresponding with four parsing carrier wave optical signals according to four corresponding voltage signals of parsing carrier wave optical signal
Digital signal；
It is demodulated, is obtained corresponding with four parsing carrier wave optical signals according to four corresponding digital signals of parsing carrier wave optical signal
Demodulated signal, four corresponding demodulated signals of parsing carrier wave optical signal are to be modulated in modulated light source in the carrier signal
Modulated signal.
10. a kind of optical communication system, including transmitter and receiver, transmitter is used for the precoding and modulation of optical signal, will adjust
Carrier signal after system is transmitted to receiver through transmission link, which is characterized in that the receiver includes such as claim 1 to 8
Described in any item coherent receivers.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111917486A (en) * | 2020-07-30 | 2020-11-10 | 烽火通信科技股份有限公司 | Coherent receiver phase angle detection method and device |
| WO2022222933A1 (en) * | 2021-04-20 | 2022-10-27 | 华为技术有限公司 | Transmission method and reception method for optical communication, and corresponding device |
| CN116032373A (en) * | 2023-01-09 | 2023-04-28 | 深圳市光为光通信科技有限公司 | Coherent optical module and preparation process thereof |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7209670B2 (en) * | 2003-04-29 | 2007-04-24 | Nortel Networks Limited | Polarization diversity receiver for optical transmission system |
| US20070140613A1 (en) * | 2003-07-02 | 2007-06-21 | Celight, Inc. | Integrated coherent optical detector |
| CN102291183A (en) * | 2011-09-21 | 2011-12-21 | 中国电子科技集团公司第四十四研究所 | burst light signal receiving method and device |
| US20120010513A1 (en) * | 2010-07-08 | 2012-01-12 | Wong Stephen T C | Chemically-selective, label free, microendoscopic system based on coherent anti-stokes raman scattering and microelectromechanical fiber optic probe |
| CN103124208A (en) * | 2013-02-28 | 2013-05-29 | 西南交通大学 | Multiple-input-multiple-output optical transmission scheme based on multiple polarizations |
| CN104753585A (en) * | 2015-04-13 | 2015-07-01 | 国家电网公司 | Intelligent optical fiber distribution device |
| CN105281862A (en) * | 2015-11-04 | 2016-01-27 | 北京科技大学 | Polarization multiplexing direct detection system and method |
| CN106911395A (en) * | 2017-01-10 | 2017-06-30 | 西南交通大学 | A kind of biorthogonal palarization multiplexing intensity modulated system and its Deplexing method |
| CN106918390A (en) * | 2017-04-18 | 2017-07-04 | 昆山金鸣光电科技有限公司 | A kind of receiving terminal optical power control system for optical fiber vibration sensing |
| CN107294596A (en) * | 2016-03-30 | 2017-10-24 | 青岛海信宽带多媒体技术有限公司 | Optical signal processing method and optical network unit in optical module |
-
2019
- 2019-07-24 CN CN201910673223.7A patent/CN110460387A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7209670B2 (en) * | 2003-04-29 | 2007-04-24 | Nortel Networks Limited | Polarization diversity receiver for optical transmission system |
| US20070140613A1 (en) * | 2003-07-02 | 2007-06-21 | Celight, Inc. | Integrated coherent optical detector |
| US20120010513A1 (en) * | 2010-07-08 | 2012-01-12 | Wong Stephen T C | Chemically-selective, label free, microendoscopic system based on coherent anti-stokes raman scattering and microelectromechanical fiber optic probe |
| CN102291183A (en) * | 2011-09-21 | 2011-12-21 | 中国电子科技集团公司第四十四研究所 | burst light signal receiving method and device |
| CN103124208A (en) * | 2013-02-28 | 2013-05-29 | 西南交通大学 | Multiple-input-multiple-output optical transmission scheme based on multiple polarizations |
| CN104753585A (en) * | 2015-04-13 | 2015-07-01 | 国家电网公司 | Intelligent optical fiber distribution device |
| CN105281862A (en) * | 2015-11-04 | 2016-01-27 | 北京科技大学 | Polarization multiplexing direct detection system and method |
| CN107294596A (en) * | 2016-03-30 | 2017-10-24 | 青岛海信宽带多媒体技术有限公司 | Optical signal processing method and optical network unit in optical module |
| CN106911395A (en) * | 2017-01-10 | 2017-06-30 | 西南交通大学 | A kind of biorthogonal palarization multiplexing intensity modulated system and its Deplexing method |
| CN106918390A (en) * | 2017-04-18 | 2017-07-04 | 昆山金鸣光电科技有限公司 | A kind of receiving terminal optical power control system for optical fiber vibration sensing |
Non-Patent Citations (1)
| Title |
|---|
| NELSON J. MUGA: "Using the Stokes space for equalization of polarization impairments in digital coherent optical receivers", 《2016 18TH INTERNATIONAL CONFERENCE ON TRANSPARENT OPTICAL NETWORKS (ICTON)》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111917486A (en) * | 2020-07-30 | 2020-11-10 | 烽火通信科技股份有限公司 | Coherent receiver phase angle detection method and device |
| WO2022222933A1 (en) * | 2021-04-20 | 2022-10-27 | 华为技术有限公司 | Transmission method and reception method for optical communication, and corresponding device |
| CN116032373A (en) * | 2023-01-09 | 2023-04-28 | 深圳市光为光通信科技有限公司 | Coherent optical module and preparation process thereof |
| CN116032373B (en) * | 2023-01-09 | 2023-09-12 | 深圳市光为光通信科技有限公司 | Coherent optical module and preparation process thereof |
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