CN107026693A - Coherent receiver, the method detected for optical information - Google Patents
Coherent receiver, the method detected for optical information Download PDFInfo
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- CN107026693A CN107026693A CN201610074544.1A CN201610074544A CN107026693A CN 107026693 A CN107026693 A CN 107026693A CN 201610074544 A CN201610074544 A CN 201610074544A CN 107026693 A CN107026693 A CN 107026693A
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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
- H04B10/613—Coherent receivers including phase diversity, e.g., having in-phase and quadrature branches, as in QPSK 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
- H04B10/6165—Estimation of the phase of the received optical signal, phase error estimation or phase error correction
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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
- H04B10/65—Intradyne, i.e. coherent receivers with a free running local oscillator having a frequency close but not phase-locked to the carrier signal
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- Engineering & Computer Science (AREA)
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Abstract
A kind of method detected the embodiments of the invention provide coherent receiver and for optical information, the coherent receiver includes：Local vibration source, the local vibration source includes digital analog converter, electrooptic modulator and laser, the digital analog converter, which is used to generate, includes the analog electrical signal of N number of subcarrier, the electrooptic modulator is used for the initial optical signal that the analog electrical signal is modulated to laser generation, generation includes the local oscillator optical signal of N number of wavelength, and N is more than or equal to 1；Coherent detector, the light signal to be checked for being obtained to the coherent receiver according to the local oscillator optical signal carries out relevant detection, and obtains the detection signal of optical signal corresponding with the N number of wavelength in the light signal to be checked.The digital analog converter of coherent receiver in the embodiment of the present invention can flexibly generate various analog electrical signals, and then the electrooptic modulator in local vibration source can flexibly adjust local oscillator optical signal by the analog electrical signal, and then can realize flexible frequency sweep.
Description
Technical field
The present invention relates to the communications field, more particularly to a kind of coherent receiver, the side detected for optical information
Method.
Background technology
Continuous increase with people to data traffic requirement, high-capacity and high-speed optical fiber transmission network gradually into
For the Main way of information transfer.The continuous innovation of New Technology of Fiber Optical Communications, has also contributed to optical fiber transmission
Distance and transmission capacity are doubling year by year.Optical information detection becomes the focus of research.For example, optical property
Monitoring (Optical Performance Monitor OPM) technology is a kind of technology for realizing monitoring optical parameter,
Played an important role in monitoring, management and maintenance in optical-fiber network.Recently, the just continuous court of OPM technologies
High accuracy, the inexpensive, direction of real time implementation to develop.Inexpensive arrowband coherent receiver is OPM skills
The conventional equipment of art.In order to realize high-precision monitoring, it is necessary to be the coherent receiver configuration of inexpensive arrowband
One high accuracy and the strong local vibration source of flexibility.
Light sweep frequency technique can realize the consecutive variations of the light frequency in certain bandwidth range.Sweeping steps are
The frequency shift amount of each frequency sweep.High-precision frequency sweep optical signal, can be with as the local oscillator of coherent receiver
Fractional-sample of the coherent receiver in broadband signal is realized, specifically, there are a variety of frequencies in width signal
The signal of rate, because coherent receiver can detect the signal close with the local frequency of coherent receiver,
Therefore change the local frequency of coherent receiver to realize the sample detecting of different frequency signals by frequency sweep.
So as to realize the monitoring to optical parameter using OPM.High accuracy, the light of sweeping steps flexible modulation
Sweep frequency technique is conducive to the realization of OPM technologies.
The principle of existing Single wavelength frequency sweep optical fiber laser is：Using modulator, by frequency penetrating for ω
Frequently (Radio Frequency, RF) signal modulation laser, makes laser frequency produce ω shift frequency amount, so
After make laser cycle through the light after modulating system, shift frequency continue in the presence of modulator it is equally spaced move
Frequently, this creates the terminal a frequency sweep process.However, the modulator of Single wavelength frequency sweep optical fiber laser is more
Secondary modulation Insertion Loss is big, and swept frequency range is narrower, it is impossible to realize flexible frequency sweep.
The principle of broadband frequency sweep optical fiber laser frequency sweep method is tuned based on dispersion：It is real by adjusting resonator
Existing frequency sweep.However, tuning the sweeping steps regulation of broadband frequency sweep optical fiber laser frequency sweep method not based on dispersion
Flexibly, sweeping steps are too big, can not equally realize flexible frequency sweep.
Therefore, how to realize that flexible frequency sweep turns into urgent problem to be solved.
The content of the invention
The embodiment of the present invention provides a kind of coherent receiver and the method detected for optical information, the phase stem grafting
Receipts machine can realize flexible frequency sweep.
First aspect includes there is provided a kind of coherent receiver, the coherent receiver：
Local vibration source, the local vibration source includes digital analog converter, electrooptic modulator and laser, the digital-to-analogue conversion
Device, which is used to generate, includes the analog electrical signal of N number of subcarrier, and the electrooptic modulator is used for the analog telecommunications
On the initial optical signal for number being modulated to laser generation, generation includes the local oscillator optical signal of N number of wavelength,
N is more than or equal to 1；
Coherent detector, the light-metering to be checked for being obtained according to the local oscillator optical signal to the coherent receiver is believed
Number carry out relevant detection, and obtain the inspection of optical signal corresponding with the N number of wavelength in the light signal to be checked
Survey signal.
Therefore, digital analog converter can be flexible in the local vibration source of the coherent receiver in the embodiment of the present invention
Generation include the analog electrical signal of N number of subcarrier, and then can incite somebody to action should for the electrooptic modulator in local vibration source
Analog electrical signal is modulated on the initial optical signal of laser generation, and generation includes the local oscillator of N number of wavelength
Optical signal, can realize flexible frequency sweep.
Specifically, coherent receiver obtain optical fiber link in light signal to be checked, by the optical signal with
The local oscillator optical signal mixing that the local vibration source of the coherent receiver is produced carries out relevant detection, obtains light-metering to be checked
The detection signal of signal.It should be understood that the process of the relevant detection can be carried out according to existing method, this
Inventive embodiments are limited not to this.
For example, can be mixed local oscillator optical signal and light signal to be checked first by frequency mixer, then will
Optical signal input photoelectric detector PD after mixing converts optical signals to electric signal, then inputs modulus
Converter ADC samples, and obtains the detection signal of the light signal to be checked.The detection signal can be used for
The feature extraction of follow-up light signal to be checked, for example, carrying out optical property detection, for example, carries out light noise
Measurement than OSNR etc., realizes monitoring optical parameter.The embodiment of the present invention is limited not to this.
It should be understood that the digital analog converter in the embodiment of the present invention can be obtained by the data signal of input should
The analog electrical signal of N number of subcarrier, for example, can be by by the numeral with N number of subcarrier of input
Signal is converted to the analog electrical signal of N number of subcarrier；The digital analog converter itself can also produce N
The analog electrical signal of individual subcarrier, for example, the digital analog converter can be AWG
(Arbitrary Waveform Generator, AWG), AWG itself can produce N number of sub- load
The analog electrical signal of ripple.It should be understood that in the embodiment of the present invention, digital analog converter can also be other devices,
As long as digital analog converter can produce the analog electrical signal with N number of subcarrier, the embodiment of the present invention
It is not limited to this.
With reference in a first aspect, in a kind of implementation of first aspect, the coherent receiver also includes：
Channel-splitting filter, the channel-splitting filter is used to the local oscillator optical signal that this includes N number of wavelength being decomposed into and the N
The individual one-to-one N number of local oscillator optical signal of wavelength difference, N is more than or equal to 2；
It is every in the coherent detector, including N number of sub- coherent detector, N number of sub- coherent detector
A local oscillator optical signal of the individual sub- coherent detector simultaneously respectively in N number of local oscillator optical signal is treated
Detect that optical signal carries out relevant detection, and obtain corresponding respectively with N number of wavelength in the light signal to be checked
The light signal to be checked N number of detection signal.
Specifically, the analog electrical signal that digital analog converter is sent in the embodiment of the present invention can include single
Subcarrier, can also include multiple subcarriers.When analog electrical signal includes single subcarrier, correspondence is originally
Shaking also includes a kind of wavelength in optical signal；When analog electrical signal includes multiple subcarriers, corresponding local oscillator
Also the signal of multiple wavelength is included in optical signal.
When analog electrical signal include multiple subcarriers, when local oscillator optical signal includes the signal of multiple wavelength,
The embodiment of the present invention sends the analog electrical signal with multicarrier arrowband using digital analog converter, recycles electricity
Analog electrical signal is modulated into multiple wavelength optical signal by optical modulator in the way of carrier wave suppresses.And pass through partial wave
The multiple wavelength optical signal is decomposed into the local oscillator optical signal of multiple wavelength by device, and then in coherent detector
Each sub- coherent detector is believed according to the local oscillator optical signal decomposited with light-metering to be checked respectively simultaneously
Number relevant detection is carried out, obtain that corresponding with N number of wavelength difference in the light signal to be checked this is to be detected
The detection signal of optical signal.
Therefore, as long as changing the frequency for the radiofrequency signal that digital analog converter is sent in real time, it is possible to which realization is swept
Frequency process.Because the radiofrequency signal that digital analog converter is sent is to utilize OFDM (Orthogonal
Frequency Division Multiplexing, OFDM) principle generation, OFDM sub-carrier bin
Width is exactly sweeping steps, and OFDM subcarrier bandwidth is easily controlled, therefore frequency sweep of the present invention is walked
It is long to change very flexible.Because the sub-carrier number that OFDM is activated is any, therefore the present invention not only can be real
Existing Single wavelength frequency sweep, moreover it is possible to realize multi-wavelength frequency sweep.
, should in another implementation of first aspect with reference to first aspect and its above-mentioned implementation
Coherent receiver also includes：
Optical splitter, for the light signal to be checked to be divided into N beams, in the N beams light signal to be checked
A sub- coherent detector being used for per a branch of optical signal to be detected in N number of sub- coherent detector is with being somebody's turn to do
A branch of local oscillator optical signal of N number of local oscillator optical signal carries out relevant detection.
It should be understood that the embodiment of the present invention does not do specific restriction to the form of optical splitter, as long as of the invention
Optical splitter in embodiment can be realized is divided into N beams, the embodiment of the present invention by the light signal to be checked
It is not limited to this.
After coherent detector gets the detection signal of the signal to be detected, the detection signal can be used for
The feature extraction of follow-up light signal to be checked.The follow-up feature extraction for treating detection optical signal can be with
Carried out, can also be carried out by the coherent detector, the embodiment of the present invention is done not to this by other devices
Limit.
, should in another implementation of first aspect with reference to first aspect and its above-mentioned implementation
Coherent receiver also includes：
Optical information detection module, for carrying out feature extraction processing to the detection signal, obtains this to be detected
The characteristic information of signal.
For example, optical information detection module can be OPM modules.Coherent reception in the embodiment of the present invention
Machine can realize the fractional-sample in broadband signal in light signal to be checked, so as to real using OPM
Now treat the monitoring of the optical parameter of detection optical signal.
, should in another implementation of first aspect with reference to first aspect and its above-mentioned implementation
Electrooptic modulator is quadrature phase I/Q modulator.
, should in another implementation of first aspect with reference to first aspect and its above-mentioned implementation
Coherent receiver also includes：
Wave filter, for carrying out low-pass filtering treatment respectively to N number of detection signal.
That is, corresponding with N number of wavelength difference in the light signal to be checked is got, this is to be checked
After N number of detection signal of light signal, noise signal can be removed by wave filter.Subsequently can
More preferable feature extraction.
Second aspect includes there is provided a kind of method detected for optical information, this method：Coherent reception
Machine generation includes the analog electrical signal of N number of subcarrier, and the analog electrical signal is modulated into the coherent receiver
On the initial optical signal of generation, generation includes the local oscillator optical signal of N number of wavelength, and N is more than or equal to 1；
The coherent receiver carries out relevant detection according to the local oscillator optical signal to the light signal to be checked, and is somebody's turn to do
The detection signal of optical signal corresponding with the N number of wavelength in light signal to be checked.
Therefore, the embodiment of the present invention by generation includes the analog electrical signal of N number of subcarrier, can be by
The analog electrical signal is modulated on the initial optical signal of generation, and generation includes the local oscillator optical signal of N number of wavelength,
Flexible frequency sweep can be realized.
It should be understood that can be by any in first aspect and its implementation for the method that optical information is detected
Coherent receiver machine in implementation is performed.
With reference to second aspect, in a kind of implementation of second aspect, this method also includes：
The local oscillator optical signal for including N number of wavelength is decomposed into and N number of wavelength point by the coherent receiver
Not one-to-one N number of local oscillator optical signal, N is more than or equal to 2；
The coherent receiver carries out relevant detection to the light signal to be checked according to the local oscillator optical signal, including：
The coherent receiver treats detection optical signal according to N number of local oscillator optical signal respectively simultaneously and carries out phase
Dry detection, and obtain light signal to be checked corresponding with the N number of wavelength difference in the light signal to be checked
Detection signal.
, should in another implementation of second aspect with reference to second aspect and its above-mentioned implementation
Method also includes：
The light signal to be checked is divided into N beams by the coherent receiver, in the N beams light signal to be checked
It is used to be concerned with a branch of local oscillator optical signal of N number of local oscillator optical signal per a branch of optical signal to be detected
Detection.
, should in another implementation of second aspect with reference to second aspect and its above-mentioned implementation
Method also includes：
The coherent receiver carries out feature extraction processing to the detection signal, obtains the spy of the signal to be detected
Reference ceases.
, should in another implementation of second aspect with reference to second aspect and its above-mentioned implementation
Method also includes：
The coherent receiver carries out low-pass filtering treatment respectively to N number of detection signal.
Based on above-mentioned technical proposal, digital-to-analogue turns in the local vibration source of the coherent receiver in the embodiment of the present invention
Parallel operation, which can be generated flexibly, includes the analog electrical signal of N number of subcarrier, and then the electric light in local vibration source is adjusted
The analog electrical signal can be modulated on the initial optical signal of laser generation by device processed, and generation includes N
The local oscillator optical signal of individual wavelength, realizes flexible frequency sweep.
Brief description of the drawings
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be in the embodiment of the present invention
The required accompanying drawing used is briefly described, it should be apparent that, drawings described below is only this
Some embodiments of invention, for those of ordinary skill in the art, are not paying creative work
Under the premise of, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is the schematic block diagram of coherent receiver according to an embodiment of the invention.
Fig. 2 is the analog electrical signal schematic diagram that digital analog converter according to an embodiment of the invention is produced.
Fig. 3 is the operation principle schematic diagram of coherent receiver according to an embodiment of the invention.
Fig. 4 is the operation principle schematic diagram of coherent receiver according to another embodiment of the present invention.
Fig. 5 is the indicative flowchart of the method according to an embodiment of the invention detected for optical information.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out
Clearly and completely describe, it is clear that described embodiment is a part of embodiment of the present invention, without
It is whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art are not making wound
The every other embodiment that the property made is obtained on the premise of working, should all belong to the scope of protection of the invention.
Fig. 1 is the schematic block diagram of coherent receiver according to an embodiment of the invention.As shown in Figure 1
Coherent receiver 100 includes local vibration source 110 and coherent detector 120.
Specifically, the local vibration source 110 includes digital analog converter 111, electrooptic modulator 112 and laser
113, the digital analog converter 111, which is used to generate, includes the analog electrical signal of N number of subcarrier, and the electric light is adjusted
Device 112 processed is used to the analog electrical signal being modulated to the initial optical signal that the laser 113 is produced, raw
Into the local oscillator optical signal including N number of wavelength, N is more than or equal to 1；
Coherent detector 120 is used for the light-metering to be checked obtained according to the local oscillator optical signal to the coherent receiver
Signal carries out relevant detection, and obtains optical signal corresponding with the N number of wavelength in the light signal to be checked
Detect signal.
Therefore, the digital analog converter in the local vibration source of the coherent receiver in the embodiment of the present invention can spirit
Generation living includes the analog electrical signal of N number of subcarrier, and then the electrooptic modulator in local vibration source can be by
The analog electrical signal is modulated on the initial optical signal of laser generation, and generation includes the sheet of N number of wavelength
Shake optical signal, can realize flexible frequency sweep.
Specifically, coherent receiver obtain optical fiber link in light signal to be checked, by the optical signal with
The local oscillator optical signal mixing that the local vibration source of the coherent receiver is produced carries out relevant detection, obtains light-metering to be checked
The detection signal of signal.It should be understood that the process of the relevant detection can be carried out according to existing method, this
Inventive embodiments are limited not to this.
For example, can be mixed local oscillator optical signal and light signal to be checked first by frequency mixer, then will
Optical signal input photodetector (Photo Detector, PD) after mixing converts optical signals to electricity
Signal, then input analog-to-digital converter ADC samplings, obtain the detection signal of the light signal to be checked.
The detection signal can be used for the feature extraction of follow-up light signal to be checked, for example, carrying out optical property inspection
Survey, for example, carry out measurement of OSNR (Optical Signal-to-Noise Ratio, OSNR) etc., realize
Monitor optical parameter.The embodiment of the present invention is limited not to this.
It should be understood that the digital analog converter in the embodiment of the present invention can be obtained by the data signal of input should
The analog electrical signal of N number of subcarrier, for example, can be by by the numeral with N number of subcarrier of input
Signal is converted to the analog electrical signal of N number of subcarrier；The digital analog converter itself can also produce N
The analog electrical signal of individual subcarrier, for example, the digital analog converter can be AWG
(Arbitrary Waveform Generator, AWG), AWG itself can produce N number of sub- load
The analog electrical signal of ripple.It should be understood that in the embodiment of the present invention, digital analog converter can also be other devices,
As long as the analog electrical signal with N number of subcarrier can be produced, the embodiment of the present invention is not limited to this.
Alternatively, electrooptic modulator 112 can be quadrature phase I/Q modulator, or other devices
The analog electrical signal, is modulated on the initial optical signal that the laser 113 is produced by part as long as can realize,
Generation includes the local oscillator optical signal of N number of wavelength, you can, the embodiment of the present invention is not limited to this.
It should be understood that the analog electrical signal that digital analog converter is sent in the embodiment of the present invention can include single son
Carrier wave, can also include multiple subcarriers.When analog electrical signal includes single subcarrier, correspondence local oscillator
Also a kind of wavelength is included in optical signal；When analog electrical signal includes multiple subcarriers, corresponding local oscillator light
Also the signal of multiple wavelength is included in signal.
Accordingly, as another embodiment, when analog electrical signal includes multiple subcarriers, local oscillator optical signal
When including the signal of multiple wavelength, the coherent receiver can also include：
Channel-splitting filter, the channel-splitting filter is used to the local oscillator optical signal that this includes N number of wavelength being decomposed into and the N
The individual one-to-one N number of local oscillator optical signal of wavelength difference, N is more than or equal to 2；
It is every in the coherent detector, including N number of sub- coherent detector, N number of sub- coherent detector
A local oscillator optical signal of the individual sub- coherent detector simultaneously respectively in N number of local oscillator optical signal is treated
Detect that optical signal carries out relevant detection, and obtain corresponding respectively with N number of wavelength in the light signal to be checked
The light signal to be checked detection signal.
Specifically, the embodiment of the present invention sends the simulation electricity with multicarrier arrowband using digital analog converter
Signal, recycles electrooptic modulator that analog electrical signal is modulated into multi-wavelength light letter in the way of carrier wave suppresses
Number.And the multiple wavelength optical signal is decomposed into the local oscillator optical signal of multiple wavelength by channel-splitting filter, and then
Each sub- coherent detector in coherent detector is simultaneously respectively according to the local oscillator light letter decomposited
Number relevant detection is carried out with light signal to be checked, obtain in the light signal to be checked and to distinguish with N number of wavelength
The detection signal of the corresponding light signal to be checked.
Therefore, as long as changing the frequency for the radiofrequency signal that digital analog converter is sent in real time, it is possible to which realization is swept
Frequency process.Because the radiofrequency signal that digital analog converter is sent is to utilize OFDM (Orthogonal
Frequency Division Multiplexing, OFDM) principle generation, OFDM sub-carrier bin
Width is exactly sweeping steps, and OFDM subcarrier bandwidth is easily controlled, therefore frequency sweep of the present invention is walked
It is long to change very flexible.Because the sub-carrier number that OFDM is activated is any, therefore the present invention not only can be real
Existing Single wavelength frequency sweep, moreover it is possible to realize multi-wavelength frequency sweep.
For example, as shown in Fig. 2 the digital analog converter in the embodiment of the present invention can send multiple subcarriers
Analog electrical signal, in optical signal detecting (frequency sweep), once can only produce a subcarrier
Analog electrical signal, or once produce the analog electrical signal of multiple subcarriers, for example, as shown in Fig. 2
One waveforms stands, one subcarrier, in optical signal detecting (frequency sweep), as long as activation OFDM
A subcarrier in signal, when next frequency sweep cycle arrives, suppresses the subcarrier, activates next
Individual subcarrier, can thus generate single carrier frequency-shift signaling.Similarly, overloading can also be generated using this method
Ripple frequency-shift signaling.With single carrier frequency-shift signaling it is different when, in each frequency sweep cycle, multicarrier move
The multiple OFDM of frequency signal activation subcarrier.For example, data 1 are loaded on the subcarrier for needing to activate,
Data 0 are loaded on the subcarrier for needing to suppress, it is possible to which control produces the analog electrical signal needed.Such as
Shown in Fig. 2, due to second subcarrier loading 1, remaining subcarrier loading 0, so the digital-to-analogue turns
Parallel operation generates a subcarrier analog electrical signal, i.e., the simulation electricity corresponding to second in figure subcarrier
Signal.
Further, if the sampling rate of digital analog converter is Rs, OFDM sub-carrier number is N,
Then shift frequency step-length is：
In the present invention, shift frequency step-length is sweeping steps, as long as therefore by changing digital analog converter
Sampling rate and OFDM number of sub carrier wave just can flexibly change sweeping steps.
It should be understood that the channel-splitting filter in the embodiment of the present invention can be a specific device, or many
The combination of individual device, is decomposed into multiple optical signals, as long as that is, as long as can realize by an optical signal
It can realize the local oscillator optical signal including N number of wavelength being decomposed into and be corresponded respectively with N number of wavelength
N number of local oscillator optical signal, for example, the channel-splitting filter can be device, for example, wavelength-division be demultiplexed
With device, or the combination of multiple devices, for example, one optical splitter (Coupler) adds multiple filters
Ripple device is constituted.The embodiment of the present invention is limited not to this.
It should be understood that being decomposed into and N number of wavelength difference one in the local oscillator optical signal for including N number of wavelength
During one corresponding N number of local oscillator optical signal, light signal to be checked equally also has N number of in the embodiment of the present invention,
N number of light signal to be checked is all identical, and N number of light signal to be checked can be believed in link by same light to be coupled
, for example, it may be the light signal to be checked all the way being coupled out by optical fiber link, then passes through
Partial wave, that is, be divided into N parts and obtain；Can also be from optical fiber link while N number of treat that be coupled out
Optical signal is detected, the embodiment of the present invention is not limited to this.Wherein, by light signal to be checked all the way by dividing
Ripple and the processing procedure of N number of light signal to be checked obtained, can be carried out by coherent receiver, can also
Carried out by other devices, the embodiment of the present invention is not limited to this.
Accordingly, as another embodiment, when N number of optical signals coherent receiver to be detected passes through one
Road light signal partial wave to be checked is got, and the coherent receiver can also include：
Optical splitter, for the light signal to be checked to be divided into N beams, in the N beams light signal to be checked
A sub- coherent detector being used for per a branch of optical signal to be detected in N number of sub- coherent detector is with being somebody's turn to do
A branch of local oscillator optical signal of N number of local oscillator optical signal carries out relevant detection.To obtain and obtain this to be detected
The detection signal of the light signal to be checked corresponding with a branch of local oscillator optical signal in optical signal.
It should be understood that the embodiment of the present invention does not do specific restriction to the form of optical splitter, as long as of the invention
Optical splitter in embodiment can be realized is divided into N beams, the embodiment of the present invention by the light signal to be checked
It is not limited to this.
After coherent detector gets the detection signal of the signal to be detected, the detection signal can be used for
The feature extraction of follow-up light signal to be checked.The follow-up feature extraction for treating detection optical signal can be with
Carried out, can also be carried out by the coherent detector, the embodiment of the present invention is done not to this by other devices
Limit.
Accordingly, as another embodiment, when the follow-up feature extraction for treating detection optical signal is by this
When coherent detector is carried out, the coherent receiver can also include：
Optical information detection module, for carrying out feature extraction processing to the detection signal, obtains this to be detected
The characteristic information of signal.
For example, optical information detection module can be OPM modules.Coherent reception in the embodiment of the present invention
Machine can realize the fractional-sample in broadband signal in light signal to be checked, so as to real using OPM
Now treat the monitoring of the optical parameter of detection optical signal.
Alternatively, as another embodiment, the coherent receiver can also include：
Wave filter, for carrying out low-pass filtering treatment respectively to N number of detection signal.
That is, corresponding with N number of wavelength difference in the light signal to be checked is got, this is to be checked
After N number of detection signal of light signal, noise signal can be removed by wave filter.Subsequently can
More preferable feature extraction.
With reference to Fig. 3 and Fig. 4 specific examples, the coherent reception in the embodiment of the present invention is described in detail
The operation principle of machine.
Specifically, Fig. 3 and Fig. 4 difference is, can once be produced in the coherent receiver shown in Fig. 3
The raw local oscillator optical signal with each and every one many local oscillator wavelength.Once only produced in coherent receiver shown in Fig. 4
Local oscillator optical signal with a local oscillator wavelength.In Fig. 3, due to needing different local oscillator optical signals point
Leave, therefore, the coherent receiver shown in Fig. 3 can also include channel-splitting filter, the local oscillator light of different wave length
Signal needs to carry out relevant detection, therefore, the coherent receiver shown in Fig. 3 with light signal to be checked simultaneously
Optical splitter can also be included, the optical splitter is used to a branch of light signal to be checked being divided into many parts.Due to Fig. 4
In coherent receiver once only produce the local oscillator optical signal with local oscillator wavelength, therefore, in Fig. 4
Coherent receiver can not include channel-splitting filter and optical splitter.
Specifically, coherent receiver 300 as shown in Figure 3 can include local vibration source and coherent detector.
Alternatively, channel-splitting filter and optical splitter can also be included, wherein, the local vibration source includes digital analog converter, electricity
Optical modulator and laser；The coherent detector includes N number of sub- coherent detector：The relevant detection of first son
Device ..., the sub- coherent detectors of N, wherein, using digital analog converter as AWG in Fig. 3
AWG, electrooptic modulator illustrates for I/Q modulator.
Specifically, as shown in figure 3, the AWG, which is used to generate, includes the analog electrical signal of N number of subcarrier,
The electrooptic modulator is used for the initial optical signal that the analog electrical signal is modulated to laser generation, raw
Into the local oscillator optical signal including N number of wavelength,
Local oscillator optical signal including N number of wavelength is decomposed into and the one-to-one N of N number of wavelength by channel-splitting filter
Individual local oscillator optical signal：First wave length local oscillator optical signal, second wave length local oscillator optical signal ... and N wavelength sheet
Shake optical signal.
Optical splitter is divided into the light-metering to be checked of N beams by next a branch of light signal to be checked is coupled from optical fiber link
Signal：First light signal .. N to be checked light signals to be checked.
Each sub- coherent detector is concerned with to a branch of light signal to be checked and a branch of local oscillator optical signal
Detection, and obtain the detection of optical signal corresponding with a branch of local oscillator optical signal in the light signal to be checked and believe
Number.For example, the first sub- coherent detector enters to first wave length local oscillator optical signal and the first light signal to be checked
The relevant detection of row, and obtain the detection letter of optical signal corresponding with the first wave length in the light signal to be checked
Number；The sub- coherent detectors of N are concerned with to N wavelength local oscillator optical signal and N light signals to be checked
Detection, and obtain the detection signal of optical signal corresponding with the N wavelength in the light signal to be checked.
Specifically, coherent receiver 400 as shown in Figure 4 can include local vibration source and coherent detector.
Wherein, the local vibration source includes digital analog converter, electrooptic modulator and laser；Wherein, with number in Fig. 4
Weighted-voltage D/A converter is AWG AWG, and electrooptic modulator illustrates for I/Q modulator.
Specifically, as shown in figure 4, the AWG, which is used to generate, includes the analog electrical signal of 1 subcarrier,
The electrooptic modulator is used for the initial optical signal that the analog electrical signal is modulated to laser generation, raw
Into including the local oscillator optical signal of 1 wavelength,
Coherent detector light signal to be checked and local oscillator optical signal carry out relevant detection, and it is to be detected to obtain this
The detection signal of optical signal corresponding with the local oscillator optical signal in optical signal.
The coherent receiver of the embodiment of the present invention is described in detail above in conjunction with Fig. 1 to Fig. 4, ties below
Close the method that Fig. 5 describes the optical information detection of the embodiment of the present invention.
Fig. 5 is the indicative flowchart of the method for optical information detection according to an embodiment of the invention.Figure
The method of optical information detection shown in 5 is corresponding with Fig. 1 to Fig. 4 coherent receiver, Fig. 1 to Fig. 4
Each device in coherent receiver can realize the respective process in Fig. 5 methods, to avoid repeating, this
Description is described in detail in appropriate omit in place.
Specifically, the method 500 of optical information as shown in Figure 5 detection includes：
510, coherent receiver generation includes the analog electrical signal of N number of subcarrier, by the analog electrical signal
On the initial optical signal for being modulated to coherent receiver generation, generation includes the local oscillator optical signal of N number of wavelength,
N is more than or equal to 1；
520, the coherent receiver carries out relevant detection according to the local oscillator optical signal to the light signal to be checked,
And obtain the detection signal of optical signal corresponding with the N number of wavelength in the light signal to be checked.
Therefore, the embodiment of the present invention by generation includes the analog electrical signal of N number of subcarrier, can be by
The analog electrical signal is modulated on the initial optical signal of generation, and generation includes the local oscillator optical signal of N number of wavelength,
Flexible frequency sweep can be realized.
It should be understood that the analog electrical signal in the embodiment of the present invention can include single subcarrier, it can also wrap
Include multiple subcarriers.When analog electrical signal includes single subcarrier, also include in correspondence local oscillator optical signal
A kind of wavelength；When analog electrical signal includes multiple subcarriers, also include in corresponding local oscillator optical signal many
The signal of individual wavelength.
Alternatively, as another embodiment, when analog electrical signal includes multiple subcarriers, local oscillator optical signal
When including the signal of multiple wavelength, this method also includes：This is included N number of wavelength by the coherent receiver
Local oscillator optical signal be decomposed into the N number of wavelength one-to-one N number of local oscillator optical signal respectively, N is big
In or equal to 2；
In 520, the coherent receiver treats detection light letter according to N number of local oscillator optical signal respectively simultaneously
Number carry out relevant detection, and obtain that corresponding with N number of wavelength difference in the light signal to be checked this is to be checked
The detection signal of light signal.
Alternatively, as another embodiment, this method also includes：
The light signal to be checked is divided into N beams by the coherent receiver, in the N beams light signal to be checked
It is used to be concerned with a branch of local oscillator optical signal of N number of local oscillator optical signal per a branch of optical signal to be detected
Detection.
After the detection signal of the signal to be detected is got, the detection signal can be used for follow-up to be checked
The feature extraction of light signal.The follow-up feature extraction for treating detection optical signal can be by other devices
Part is carried out, and can also be carried out by the coherent detector, the embodiment of the present invention is limited not to this.
Alternatively, as another embodiment, when the follow-up feature extraction for treating detection optical signal is by this
When coherent detector is carried out, this method also includes：
The coherent receiver carries out feature extraction processing to the detection signal, obtains the spy of the signal to be detected
Reference ceases.
Alternatively, as another embodiment, this method also includes：
The coherent receiver carries out low-pass filtering treatment respectively to N number of detection signal.
That is, corresponding with N number of wavelength difference in the light signal to be checked is got, this is to be checked
After N number of detection signal of light signal, noise signal can be removed by wave filter, subsequently can
More preferable feature extraction.
It should be understood that " one embodiment " or " embodiment " that specification is mentioned in the whole text mean with
During the relevant special characteristic of embodiment, structure or characteristic are included at least one embodiment of the present invention.Cause
This, " in one embodiment " or " in one embodiment " occurred everywhere in entire disclosure may not
Necessarily refer to identical embodiment.In addition, what these specific feature, structure or characteristics can arbitrarily be adapted to
Mode is combined in one or more embodiments.It should be understood that in various embodiments of the present invention, it is above-mentioned
The size of the sequence number of each process is not meant to the priority of execution sequence, the execution sequence Ying Yiqi of each process
Function and internal logic are determined, any limit is constituted without tackling the implementation process of the embodiment of the present invention.
In addition, the terms " system " and " network " are often used interchangeably herein.Herein
Middle term "and/or", only a kind of incidence relation for describing affiliated partner, represents there may be three kinds
Relation, for example, A and/or B, can be represented：Individualism A, while there is A and B, is individually deposited
In these three situations of B.In addition, character "/" herein, it is a kind of "or" to typically represent forward-backward correlation object
Relation.
It should be understood that in embodiments of the present invention, " B " corresponding with A represents that B is associated with A, root
B can be determined according to A.It is also to be understood that determining that B is not meant to determine only according to A according to A
B, can also determine B according to A and/or other information.
Those of ordinary skill in the art are it is to be appreciated that with reference to each of the embodiments described herein description
The unit and algorithm steps of example, can come real with electronic hardware, computer software or the combination of the two
It is existing, in order to clearly demonstrate the interchangeability of hardware and software, in the above description according to function one
As property describe the composition and step of each example.These functions are held with hardware or software mode actually
OK, depending on the application-specific and design constraint of technical scheme.Professional and technical personnel can be to each
It is specific to apply to realize described function using distinct methods, but this realization is it is not considered that super
Go out the scope of the present invention.
It is apparent to those skilled in the art that, it is for convenience of description and succinctly, above-mentioned
The specific work process of the system of description, device and unit, may be referred to pair in preceding method embodiment
Process is answered, be will not be repeated here.
In several embodiments provided herein, it should be understood that disclosed system, device and
Method, can be realized by another way.For example, device embodiment described above is only to show
Meaning property, for example, the division of unit, only a kind of division of logic function, can have when actually realizing
Other dividing mode, such as multiple units or component can combine or be desirably integrated into another system,
Or some features can be ignored, or do not perform.In addition, shown or discussed coupling each other or
Direct-coupling or communication connection can be the INDIRECT COUPLING or communication link by some interfaces, device or unit
Connect or electricity, mechanical or other forms connect.
The unit illustrated as separating component can be or may not be physically separate, be used as list
The part of member display can be or may not be physical location, you can with positioned at a place, or
It can also be distributed on multiple NEs.Part therein can be selected according to the actual needs or complete
Portion's unit realizes the purpose of scheme of the embodiment of the present invention.
In addition, each functional unit in each embodiment of the invention can be integrated in a processing unit,
Can also be that unit is individually physically present or two or more units are integrated in one
In unit.Above-mentioned integrated unit can both be realized in the form of hardware, it would however also be possible to employ software function
The form of unit is realized.
Through the above description of the embodiments, it is apparent to those skilled in the art that originally
Invention can be realized with hardware, or firmware is realized, or combinations thereof mode is realized.When using software
When realizing, above-mentioned functions can be stored in computer-readable medium or as on computer-readable medium
One or more instructions or code be transmitted.Computer-readable medium include computer-readable storage medium and
Communication media, wherein communication media include being easy to transmit computer program from a place to another place
Any medium.Storage medium can be any usable medium that computer can be accessed.As example but
It is not limited to：Computer-readable medium can include RAM, ROM, EEPROM, CD-ROM or its
His optical disc storage, magnetic disk storage medium or other magnetic storage apparatus or it can be used in carrying or store
With instruction or data structure form desired program code and can by computer access it is any its
His medium.In addition.Any connection can be suitably turn into computer-readable medium.If for example, software
Be using coaxial cable, optical fiber cable, twisted-pair feeder, Digital Subscriber Line (DSL) or such as infrared ray,
The wireless technology of radio and microwave etc is transmitted from website, server or other remote sources, then
The nothing of coaxial cable, optical fiber cable, twisted-pair feeder, DSL or such as infrared ray, wireless and microwave etc
Line technology be included in belonging to medium it is fixing in.As used in the present invention, disk (Disk) and dish (disc)
Including compression laser disc (CD), laser disc, laser disc, Digital Versatile Disc (DVD), floppy disk and blue light
Laser disc, the replicate data of the usual magnetic of which disk, and dish is then with laser come optical replicate data.Above
Combination should also be as being included within the protection domain of computer-readable medium.
In a word, the preferred embodiment of technical solution of the present invention is the foregoing is only, is not intended to limit
Protection scope of the present invention.Within the spirit and principles of the invention, it is any modification for being made, equivalent
Replace, improve etc., it should be included in the scope of the protection.
Claims (11)
1. a kind of coherent receiver, it is characterised in that including：
Local vibration source, the local vibration source includes digital analog converter, electrooptic modulator and laser, the digital-to-analogue
Converter, which is used to generate, includes the analog electrical signal of N number of subcarrier, and the electrooptic modulator is used for will be described
Analog electrical signal is modulated on the initial optical signal that the laser is produced, and generation includes the sheet of N number of wavelength
Shake optical signal, and N is more than or equal to 1；
Coherent detector, for according to the local oscillator optical signal coherent receiver is obtained it is to be detected
Optical signal carries out relevant detection, and obtains light corresponding with the N number of wavelength in the light signal to be checked
The detection signal of signal.
2. coherent receiver according to claim 1, it is characterised in that the coherent receiver
Also include：
Channel-splitting filter, the channel-splitting filter is used to the local oscillator optical signal including N number of wavelength being decomposed into and institute
N number of wavelength one-to-one N number of local oscillator optical signal respectively is stated, N is more than or equal to 2；
In the coherent detector, including N number of sub- coherent detector, N number of sub- coherent detector
Every sub- coherent detector local oscillator light letter respectively simultaneously in N number of local oscillator optical signal
Number treat detection optical signal and carry out relevant detection, and obtain in the light signal to be checked with N number of ripple
N number of detection signal of the long light signal to be checked corresponding respectively.
3. coherent receiver according to claim 2, it is characterised in that the coherent receiver
Also include：
Optical splitter, for the light signal to be checked to be divided into N beams, the N beams light signal to be checked
In the relevant detection of a son that is used in N number of sub- coherent detector of every a branch of optical signal to be detected
A branch of local oscillator optical signal of device and N number of local oscillator optical signal carries out relevant detection.
4. coherent receiver according to any one of claim 1 to 3, it is characterised in that institute
Stating coherent receiver also includes：
Optical information detection module, for it is described detection signal carry out feature extraction processing, obtain described in treat
Detect the characteristic information of signal.
5. coherent receiver according to any one of claim 1 to 4, it is characterised in that
The digital analog converter is AWG AWG, and the electrooptic modulator is quadrature phase
I/Q modulator.
6. coherent receiver according to any one of claim 1 to 5, it is characterised in that institute
Stating coherent receiver also includes：
Wave filter, for carrying out low-pass filtering treatment respectively to N number of detection signal.
7. a kind of method detected for optical information, it is characterised in that including：
Coherent receiver generation includes the analog electrical signal of N number of subcarrier, and the analog electrical signal is modulated
On the initial optical signal produced to the coherent receiver, generation includes the local oscillator optical signal of N number of wavelength,
N is more than or equal to 1；
The coherent receiver carries out relevant inspection according to the local oscillator optical signal to the light signal to be checked
Survey, and obtain the detection signal of optical signal corresponding with the N number of wavelength in the light signal to be checked.
8. method according to claim 7, it is characterised in that methods described also includes：
The coherent receiver by the local oscillator optical signal including N number of wavelength be decomposed into it is described N number of
The one-to-one N number of local oscillator optical signal of wavelength difference, N is more than or equal to 2；
The coherent receiver carries out relevant inspection according to the local oscillator optical signal to the light signal to be checked
Survey, including：
The coherent receiver is treated detection optical signal according to N number of local oscillator optical signal respectively simultaneously and entered
The relevant detection of row, and obtain corresponding respectively with N number of wavelength in the light signal to be checked described treat
Detect the detection signal of optical signal.
9. method according to claim 8, it is characterised in that methods described also includes：
The light signal to be checked is divided into N beams, the N beams light-metering letter to be checked by the coherent receiver
Every a branch of optical signal to be detected in number is used for a branch of local oscillator optical signal with N number of local oscillator optical signal
Carry out relevant detection.
10. the method according to any one of claim 7 to 9, it is characterised in that methods described
Also include：
The coherent receiver carries out feature extraction processing to the detection signal, obtains the letter to be detected
Number characteristic information.
11. the method according to any one of claim 7 to 10, it is characterised in that the side
Method also includes：
The coherent receiver carries out low-pass filtering treatment respectively to N number of detection signal.
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