CN107395288A - The optical heterodyne coherent reception method and system of a kind of polarization diversity - Google Patents
The optical heterodyne coherent reception method and system of a kind of polarization diversity Download PDFInfo
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- CN107395288A CN107395288A CN201710607170.XA CN201710607170A CN107395288A CN 107395288 A CN107395288 A CN 107395288A CN 201710607170 A CN201710607170 A CN 201710607170A CN 107395288 A CN107395288 A CN 107395288A
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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
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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
- H04B10/6162—Compensation of polarization related effects, e.g., PMD, PDL
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Abstract
The invention discloses the optical heterodyne coherent reception method and system of a kind of polarization diversity.The receiving terminal of the system includes：Polarization diversity heterodyne reciver module, for polarisation-multiplexed signal light beam splitting, obtaining the mono- polarization signals of X and the mono- polarization signals of Y；Local oscillator light is split, obtains two beam local oscillator light；Then a branch of local oscillator light is closed to the signal progress power detection after beam and pairing beam with the mono- polarization signals of X obtain the electric signal of the mono- polarization signals of X, the signal after another Shu Benzhen light and the mono- polarization signal conjunction beams of Y and pairing beam is carried out into power detection obtains the electric signal of the mono- polarization signals of Y；The signal beat frequency interference compensation module of polarization diversity heterodyne reciver module is connected, connects the down conversion module of signal beat frequency interference compensation module, connects the nyquist filtering module of down conversion module；Joint equalization module, for the optical signal of balanced two polarizations, then export demodulated signal.The present invention it is simple in construction and on bit error rate performance close to balance detection.
Description
Technical field
The invention belongs to optical communication field, is related to a kind of method and system based on optical heterodyne coherent reception, more particularly to
A kind of receiving terminal demodulation method based on Nyquist matched filtering, and corresponding receiver structure and system.
Background technology
Coherent optical communication system has high sensitivity, the advantage of transmission range length, is middle and long distance fiber-optic communications traffic system
The important solutions of system.Coherent optical communication system can be divided into homodyne detection and heterodyne detects two kinds.Homodyne detection system will
The set of frequency of local oscillations light is, local oscillations light frequency and the letter of heterodyne detection system identical with the frequency of signal light carrier
Number optical carrier frequency has a frequency shift (FS).
Coherent receiver common in optical communication system includes photo-coupler at present, Polarization Control beam splitter, frequency mixer and
Photo-detector.Homodyne coherent receiver has illustrated in more documents and patent.For each polarization signal, generally need
An optical mixer unit and two balance photo-detectors are wanted to realize that the same phase of signal, orthogonal two-way receive demodulation.It can be seen that this
The structure of sample can make it that system device is more, and relatively large sized, cost is of a relatively high.This be also exactly the present invention to improve and
The place of innovation.
The content of the invention
For technical problem present in prior art, it is an object of the invention to provide a kind of outer differential of polarization diversity
Receipts machine scheme, and realize the structure and system of this method.
To achieve the above object, the present invention adopts the following technical scheme that：
A kind of palarization multiplexing modulation system based on nyquist filtering, comprises the following steps：
The first step：According to the baud rate of the bandwidth determining modulation signal of each device of system；
Second step：The light that light source comes out passes through 50:50 coupler is divided into two-way, modulates X and Y polarization signals respectively, main
Want content to include mapping of the binary sequence to constellation symbols, add frame preamble sequence and Nyquist molding filtration, then
Light modulating signal (the i.e. polarisation-multiplexed signal of Fig. 1 input receivers for all the way, forming palarization multiplexing is combined into by polarization beam combiner
Light)；
3rd step：Polarisation-multiplexed signal light is received in receiving terminal.The regulation of local oscillator light is (general to require to suitable frequency：
1) it is slightly larger than the half of signal baud rate, ensures flashlight entirely in the side of local oscillator light；2) it is less than receiver photodetector strings
The half of wide subtraction signal baud rate, ensure that flashlight is changed into after electric signal without departing from photodetector bandwidth), utilize light point
Beam device is split to local oscillator light, flashlight is split using polarization beam apparatus, then using photo-coupler (as long as by coupling
The two-beam of conjunction keeps identical polarization direction to carry out closing beam can, can be combiner device (such as Fig. 4) or 1 ×
2MMI interferometers (such as Fig. 5)) the conjunction beam of local oscillator light and flashlight is realized, form the optical heterodyne reception scheme of polarization diversity.
Further, the signal of transmitting terminal is pre-processed before polarization beam combiner, including the non-linear precompensation of modulator,
Dispersion pre-compensation or optical fiber Kerr nonlinearity precompensation.
Further, single-ended photoelectricity is eliminated using iterative algorithm in Digital Signal Processing (DSP) for receiving end signal
Signal caused by the detection of detector (PD) square-law-signal beat frequency damage.
A kind of optical heterodyne coherent reception system for realizing the above method, including transmitting terminal and receiving terminal,
The transmitting terminal includes：
Transmitting terminal nyquist filtering module, for being compressed in the case where ensureing that receiving terminal does not have intersymbol interference (ISI)
Frequency spectrum improves the availability of frequency spectrum to close to square；(originator and receiving end use a pair of identical wave filter, can obtain maximum
Signal to noise ratio.Nyquist filtering can ensure in the case of no ISI Spectrum compression to square on this basis).
The receiving terminal includes：
Optical filter module, for removing unwanted band external information；
Polarization diversity heterodyne reciver module.For the flashlight of palarization multiplexing to be separated into two letters singly polarized of X, Y
Number light, then changes into two path signal respectively by single-ended photodetector.It is specific to include module following six：
Signal optical coupler module, optical filter module is connected, to realize flashlight from Transmission Fibers to reception system
Coupling；
Polarization beam splitting module, signal optical coupler module is connected, to realize the polarization beam splitting of flashlight；
Local oscillator optical coupler module, to realize coupling of the local oscillator light from laser to reception system；
Beam splitter module, local oscillator optical coupler module is connected, to realize the equably beam splitting of local oscillator light；
Combiner device module, polarization beam splitting module and beam splitter module are connected, to realize flashlight and local oscillator light
Conjunction beam；
Single-ended photo-detector module, combiner device module is connected, to realize that the luminous power after pairing beam detects；
Signal-signal beat frequency interference compensation module, connects single-ended photo-detector module, for thermal compensation signal-signal beat frequency
Disturb (SSBI)；
Down conversion module, signal-signal beat frequency interference compensation module is connected, for the electricity for receiving photodetector (PD)
Signal frequency conversion is baseband signal；
Receiving terminal nyquist filtering module, down conversion module is connected, for eliminating intersymbol interference (ISI), lift noise
Than.
Joint equalization module, for the optical signal of balanced two polarizations simultaneously, then output demodulation.
Further, in addition to：
Transmitting terminal modulation module, for being modulated form (such as quadrature amplitude phase-modulation to original binary sequence
(QAM) form) mapping, and synchronous series and training sequence are inserted as frame structure targeting sequencing.
Transmitting terminal pretreatment module, for being pre-processed to transmitting end signal, it is then forwarded to communication channel.
Receiving terminal demodulation module, for carrying out optimum sampling point optimization, X-Y polarizations 2 to sequence after receiving terminal matched filtering
× 2 combined channels are balanced, and adjudicate solution and recall to binary sequence.
Further, the pretreatment that the front end data processing module is carried out includes：Modulator nonlinear compensation, dispersion are pre-
Compensation, the compensation of optical fiber Kerr nonlinearity.
Compared with prior art, the positive effect of the present invention is：
The method of the invention is mended in the case of heterodyne relevant detection with reference to iteration elimination signal-signal beat frequency interference
Algorithm is repaid, heterodyne coherent receiver structure and algorithm based on single-ended photodetector is proposed, realizes connecing for polarisation-multiplexed signal
Receive.Compare with the traditional coherent photoreceiver with balance photo-detector, the present invention utilizes single-ended photo-detector, has structure letter
Singly, the characteristics of size is small, and cost is low, and can be close to balance detection on bit error rate performance.
Brief description of the drawings
Fig. 1 is the overall reception system block diagram of the embodiment of the present invention.
Fig. 2 is the flow of the digital signal processing method based on polarization diversity heterodyne coherent reception of the embodiment of the present invention
Figure.
Fig. 3 is the flow details that X-Y polarizes joint equalization in digital signal processing method module.
Fig. 4 is the schematic diagram of receiver section of the embodiment of the present invention.
Fig. 5 is a kind of implementation of the receiver section of the embodiment of the present invention --- heterodyne coherent receiver is integrated on piece
Schematic diagram.
Embodiment
Below by specific embodiments and the drawings, the present invention is described in further details.
Fig. 1 is the overall reception system block diagram of the present embodiment, by receiver structure and follow-up signal process part
Composition；Detail refers to Fig. 2,3,4,5.
It is specifically described with reference to implementations of the algorithm flow Fig. 2 of the present embodiment to technical scheme.
The first step：The baud rate for the I/Q signal for determining to send according to system frequency bandwidth；
Second step：Transmitting terminal carry out rolloff-factor be α nyquist filtering, it is therefore an objective to by I/Q signal Spectrum compression into
Squarish, general α, which takes, 0.01 can ensure.
Before sending to communication channel, typically dispersion pre-compensation is carried out to signal on frequency domain：
Spre(f)=S (f) exp (- β2Lω2/2),
Wherein, Spre(f) be precompensation after frequency domain data, S (f) be precompensation before frequency domain data, β2For GVD
Coefficient, L are fiber lengths, ω be on signal frequency domain each frequency relative to the angular frequency of local oscillator light.
3rd step：Light filtering is carried out first in receiving terminal.Filter out the noise outside signal bandwidth；The palarization multiplexing letter received
Number light is divided into the mono- polarization signal of two-way X and Y after polarization beam apparatus or two-dimensional grating；(X and Y are mono- for the signal of each polarization
Polarization signal) mixed respectively with local oscillator, detected into single-ended photo-detector, electric signal and the Y for obtaining the mono- polarization signals of X are mono-
The electric signal of polarization signal；Then, in signal-signal beat frequency interference compensation module, single-ended photodetector production is compensated first
Raw signal-signal beat frequency interference：
WhereinFor the signal after interference compensation, ri(t) represent that the local oscillator light that receives and flashlight beat signal, λ are
Amplitude factor depends on local oscillator light and signal light power ratio, and Hilbert () represents Hilbert transform.This process can be with
Successive ignition steps up performance, basicly stable after general 4 to 6 times.Because the process is not related to judgement demodulation, therefore count
It is very low to calculate complexity.
Then, down coversion is carried out to obtained signal：
Then, Nyquist matched filtering is carried out to signal after down coversion.
Finally, receiving terminal demodulation, including optimum sampling point optimization are carried out, X-Y polarizations carry out the equilibrium of 2 × 2 combined channels, mended
Repay the polarization mode dispersion of fiber channel, and the polarization rotation between sending and receiving end, judgement and demodulation.
Fig. 3 is the schematic diagram of X-Y polarization combined channel equilibrium flows, and X, Y two-way polarization signal input, by the more of 2x2
Enter to have more (MIMO) joint equalization, be compensated the polarization mode dispersion of fiber channel, and after the polarization rotation between sending and receiving end
X, Y polarization output.Wherein MIMO parts are mainly made up of four transmission functions, are X to X, X to Y, Y to X, Y to Y respectively
Transmission function.
Fig. 4 is the principle schematic of receiver section.Signal is optically coupling to system and carries out polarization beam splitting into the He of light beam one
Light beam two；Local oscillator is divided into two-way through beam splitter, beam is closed with signal beams one and light beam two respectively, into light optically coupling to system
Detector detects, and obtains the electric signal of the mono- polarization signals of X and the electric signal of the mono- polarization signals of Y.
Fig. 5 shows a kind of implementation of receiver structure --- the structural representation of heterodyne reciver is integrated on piece.
Structure includes a two-dimentional coupling grating, an one-dimensional coupling grating, 1 × 2 multiple-mode interfence (MMI) beam splitter, two 2 ×
2MMI interferometers, two SiGe photo-detectors.The flashlight of palarization multiplexing is coupled on piece by two-dimentional coupling grating module, together
The separation and conversion of polarization direction mutually orthogonal Shi Shixian, the two-beam of output --- X polarization signals and Y polarization signals all into
For the TE0 patterns in silicon single mode waveguide；Local oscillator light is coupled on piece by one-dimensional coupling grating, turns into silicon single mode waveguide
TE0 patterns；1 × 2MMI splitter modules connect one-dimensional coupling grating, realize local oscillator light 50:50 uniform beam splitting, respectively with letter
Number light beam one, signal beams two carry out conjunction beam；2 × 2MMI interferometers module, two input ports connect 1 × 2MMI beam splitting respectively
Device module and two-dimentional coupling grating module, realize that signal beams one close beam respectively with local oscillator light, signal beams two and local oscillator light；Most
Afterwards, two single-ended photo-detector modules connect two beam combined beam lights respectively, detect output current signal according to square law, i.e. X is mono- inclined
Shake the electric signal of signal and the electric signal of the mono- polarization signals of Y, and collection enters the Digital Signal Processing stage.It is it should be noted that every
Individual 2 × 2MMI interferometers possess two output wide openings, and the two ports have equivalent function, it is only necessary to using wherein defeated all the way
Go out.
The above embodiments are merely illustrative of the technical solutions of the present invention rather than is limited, the ordinary skill of this area
Technical scheme can be modified by personnel or equivalent substitution, without departing from the spirit and scope of the present invention, this
The protection domain of invention should be to be defined described in claim.
Claims (10)
1. a kind of optical heterodyne coherent reception method of polarization diversity, its step include：
1) polarisation-multiplexed signal light is split, obtains the mono- polarization signals of X and the mono- polarization signals of Y；Local oscillator light is split,
Obtain two beam local oscillator light；
2) a branch of local oscillator light and the mono- polarization signals of X are closed to the signal after beam and pairing beam and carry out power detection, by another Shu Benzhen
Light closes the signal progress power detection after beam and pairing beam with the mono- polarization signals of Y, and electric signal and the Y for obtaining the mono- polarization signals of X are mono-
The electric signal of polarization signal；
3) electric signal of the mono- polarization signals of X obtained to two-way power detection and the electric signal of the mono- polarization signals of Y carry out letter successively
Number-signal beat frequency interference compensation, down coversion, Nyquist matched filtering；Then to filtered two paths of signals joint equalization, obtain
To demodulated signal.
2. the method as described in claim 1, it is characterised in that the method for generating the polarisation-multiplexed signal light is：By signal
Light is divided into two-way and modulates X polarization signals and Y polarization signals respectively；Then X polarization signals and Y polarization signals are entered successively respectively
Row binary sequence to constellation symbols mapping, add frame preamble sequence and Nyquist molding filtration after carry out conjunction beam,
Form the polarisation-multiplexed signal light.
3. method as claimed in claim 2, it is characterised in that dispersion is carried out to the signal after Nyquist molding filtration and mended in advance
Repay Spre(f)=S (f) exp (- β2Lω2/ 2) conjunction beam, is then carried out；Wherein, Spre(f) be precompensation after frequency domain data,
S (f) be precompensation before frequency domain data, β2For GVD coefficient, L is the fiber lengths in communication channel, and ω is signal
On frequency domain each frequency relative to local oscillator light angular frequency.
4. method as claimed in claim 2, it is characterised in that the Nyquist molding filtration be rolloff-factor be α how
Qwest filters；α values are 0.01.
5. the method as described in claim 1, it is characterised in that in step 3), utilize
, carry out signal-signal beat frequency interference compensation；Wherein, i=1,2,For the signal after interference compensation, ri(t) represent to receive
Local oscillator light and flashlight beat signal, λ is amplitude factor.
6. the method as described in Claims 1 to 5 is any, it is characterised in that utilize two-dimentional coupling grating by polarisation-multiplexed signal
It is split optically coupling on piece and to polarisation-multiplexed signal light；Using one-dimensional coupling grating by local oscillator optically coupling on piece, so
Local oscillator light is split using one 1 × 2 multi-mode interference beam splitters afterwards；Using one 2 × 2MMI interferometers to a branch of local oscillator light and X
Single polarization signal carries out conjunction beam, and conjunction beam is carried out to another Shu Benzhen light and the mono- polarization signals of Y using another 2 × 2MMI interferometers.
7. the method as described in Claims 1 to 5 is any, it is characterised in that using polarization beam apparatus to polarisation-multiplexed signal light
It is split；Local oscillator light is split using beam splitter；Using a combiner device to a branch of local oscillator light and the mono- polarization signals of X
Conjunction beam is carried out, conjunction beam is carried out to another Shu Benzhen light and the mono- polarization signals of Y using another combiner device.
8. a kind of optical heterodyne coherent reception system of polarization diversity, including a receiving terminal, it is characterised in that the receiving terminal bag
Include：
Polarization diversity heterodyne reciver module, for being split to polarisation-multiplexed signal light, obtain the mono- polarization signals of X and Y is mono-
Polarization signal；Local oscillator light is split, obtains two beam local oscillator light；Then a branch of local oscillator light and the mono- polarization signals of X are closed into beam simultaneously
Signal after pairing beam carries out power detection and obtains the electric signal of the mono- polarization signals of X, by another Shu Benzhen light and the mono- polarization signals of Y
Close the progress of the signal after beam and pairing beam power detection and obtain the electric signal of the mono- polarization signals of Y；
Signal-signal beat frequency interference compensation module, polarization diversity heterodyne reciver module is connected, clapped for thermal compensation signal-signal
Frequency disturbs；
Down conversion module, signal-signal beat frequency interference compensation module is connected, for the electric signal frequency conversion of reception to be believed for base band
Number；
Nyquist filtering module, down conversion module is connected, for eliminating intersymbol interference；
Joint equalization module, for the optical signal of balanced two polarizations simultaneously, then export demodulated signal.
9. system as claimed in claim 8, it is characterised in that the polarization diversity heterodyne reciver module includes：
Polarization beam splitting module, for carrying out polarization beam splitting to polarisation-multiplexed signal light, obtain the mono- polarization signals of X and the mono- polarization letters of Y
Number；
Beam splitter module, for being split to local oscillator light, obtain two beam local oscillator light；
First combiner device module, polarization beam splitting module and beam splitter module are connected, for a branch of local oscillator light and X is mono- inclined
The signal that shakes closes beam；
Second combiner device module, polarization beam splitting module and beam splitter module are connected, it is mono- inclined for another Shu Benzhen light and Y
The signal that shakes closes beam；
First single-ended photo-detector module, it is connected with the first combiner device module, for detecting the luminous power after closing beam；
Second single-ended photo-detector module, it is connected with the second combiner device module, for detecting the luminous power after closing beam.
10. system as claimed in claim 9, it is characterised in that the polarization beam splitting module is two-dimentional coupling grating；Described
The light that shakes is coupled on piece by one-dimensional coupling grating, and the beam splitter module is one 1 × 2 multi-mode interference beam splitters, with this one
Tie up coupling grating connection；The first combiner device module, the second combiner device module are respectively one 2 × 2MMI interferometers.
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| CN108566250A (en) * | 2018-03-02 | 2018-09-21 | 北京大学 | A kind of modulator approach, demodulation method and system biasing single sideband singal based on multicarrier orthogonal |
| CN108768540A (en) * | 2018-05-25 | 2018-11-06 | 武汉邮电科学研究院有限公司 | Light signal receiving, method and the relevant optical transmission system with the device |
| CN110149154A (en) * | 2019-04-10 | 2019-08-20 | 华中科技大学 | The preposition amplification coherent reception system of few mould and method for free space optical signal |
| CN110233671A (en) * | 2019-07-25 | 2019-09-13 | 重庆金山医疗技术研究院有限公司 | Optical communication structure and electronic endoscope system |
| CN110535461A (en) * | 2019-08-01 | 2019-12-03 | 上海大学 | A kind of heterodyne detection device based on optical injection-locked and Optical phase-locked loop |
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| CN108768540A (en) * | 2018-05-25 | 2018-11-06 | 武汉邮电科学研究院有限公司 | Light signal receiving, method and the relevant optical transmission system with the device |
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| CN110149154A (en) * | 2019-04-10 | 2019-08-20 | 华中科技大学 | The preposition amplification coherent reception system of few mould and method for free space optical signal |
| CN111835431A (en) * | 2019-04-16 | 2020-10-27 | 华为技术有限公司 | Coherent optical receiving device and optical signal demodulating device |
| CN112291018A (en) * | 2019-07-24 | 2021-01-29 | 中兴通讯股份有限公司 | Photoelectric receiving device and receiving method of coherent receiver and coherent receiver |
| CN110233671A (en) * | 2019-07-25 | 2019-09-13 | 重庆金山医疗技术研究院有限公司 | Optical communication structure and electronic endoscope system |
| CN110535461A (en) * | 2019-08-01 | 2019-12-03 | 上海大学 | A kind of heterodyne detection device based on optical injection-locked and Optical phase-locked loop |
| CN110535461B (en) * | 2019-08-01 | 2022-12-09 | 上海大学 | Heterodyne detection device based on light injection locking and optical phase-locked loop |
| CN114665976A (en) * | 2022-01-07 | 2022-06-24 | 南京鼎芯光电科技有限公司 | Kramers-Kronig-based integrated self-coherent receiver signal processing method and system |
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