CN108566244A - The optical device spectral response measurement method and device of multi-channel parallel - Google Patents
The optical device spectral response measurement method and device of multi-channel parallel Download PDFInfo
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- CN108566244A CN108566244A CN201810357361.XA CN201810357361A CN108566244A CN 108566244 A CN108566244 A CN 108566244A CN 201810357361 A CN201810357361 A CN 201810357361A CN 108566244 A CN108566244 A CN 108566244A
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- H—ELECTRICITY
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- 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
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
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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
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/077—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using a supervisory or additional signal
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Abstract
The invention discloses a kind of optical device spectral response measurement methods of multi-channel parallel, including：Microwave signal is modulated to the first frequency comb signal by step 1, is generated multichannel carrier wave and is inhibited light double-sideband signal；Then it is coupled with the second frequency comb signal, generates multichannel asymmetrical beam double-sideband signal, as detects optical signal；The broach frequency interval of first, second frequency comb signal is different；Step 2 enables detection optical signal by carrying out opto-electronic conversion after optical device to be measured, then therefrom extracts spectral response of the optical device to be measured in each channel parallel；Frequency response of the optical device to be measured on each channel is combined as optical device the whole spectrum response to be measured by step 3.The invention also discloses a kind of optical device spectral response measuring devices of multi-channel parallel.The present invention can be achieved at the same time high-resolution, large-scale quick high accuracy measure, prevented the mutual crosstalk in different channels, effectively eliminate receiver frequency dependence and Modulation and Nonlinear caused by measurement error.
Description
Technical field
The present invention relates to a kind of a kind of optical device of optical device spectral response measurement method more particularly to multi-channel parallel frequencies
Response measurement method and device are composed, optical device field of measuring technique is belonged to.
Background technology
In recent years, with the rapid development of optic communication and universal, photon technology has obtained quick development and continuous complete
Kind, to manufacturing, producing in optical device, application, the requirement of essential optical device measuring technique is also more next during detection etc.
It is higher.However, existing optical device measuring technique there is measurement accuracy with resolution ratio is not high, measurement range is small etc. many asks
Topic.J.E.Roman in 1998 propose based on optical SSB modulation light vector analysis method [J.E.Rom á n,
M.Y.Frankel,and R.D.Esman,"Spectral characterization of fiber gratings with
high resolution,"Opt.Lett.,vol.23,no.12,pp.939-941,Jun.1998.].Benefit from ripe electricity
The area of light frequency sweep of coarseness can be converted into high-precision by spectrum analysis technique, the light vector analysis method based on optical SSB modulation
Thin electrical domain frequency sweep so that Measurement Resolution greatly improves, and theoretically can reach Hz magnitudes (existing business light vector analyzer
Resolution ratio be 200MHz), realize high-resolution, high-precision optical device measure.But the light vector based on optical SSB modulation
Analysis method is limited to current electric spectrum analysis technique, and high-precision electric spectrum analysis can only be realized within the scope of 50GHz,
And the modulated non-linear caused high-order sideband of measuring accuracy influences.Recently, minister in ancient times is graceful et al. in " Optical vector
analysis based on asymmetrical optical double-sideband modulation using a
dual-drive dual-parallel Mach-Zehnder modulator”(T.Qing,S.P.Li,M.Xue,W.Li,
N.H.Zhu and S.L.Pan,"Optical vector analysis based on asymmetrical optical
double-sideband modulation using a dual-drive dual-parallel Mach-Zehnder
Modulator, " Optics Express, vol.25, no.5, pp.4665-4671, Mar.2017.) propose based on asymmetric
The optical device measurement method of double sideband modulation, measures, and measurement range is carried while capable of realizing amplitude response and phase response
Twice of a height of optical device measurement method based on single sideband modulation, and measuring accuracy not high-order caused by by Modulation and Nonlinear
Sideband influences.But the method still cannot be satisfied the measurement range of optical device several THz easily.
In order to further increase measurement range, Xue Min et al. is in " Wideband optical vector network
analyzer based on optical single-sideband modulation and optical frequency
comb”(M.Xue,Y.J.Zhao,X.W.Gu and S.L.Pan,"Performance analysis of optical
vector analyzer based on optical single-sideband modulation,"Journal of the
Optical Society of America B, vol.30, no.4, pp.928-933, Apr.2013.) in by frequency comb and base
It is combined in the light vector analytical technology of optical SSB modulation so that measurement range greatly increases, but the disadvantages of this method is：1、
Each channel need to measure successively, if the time for measuring a channel is T, then the time for measuring N number of channel is NT, expansion
Measurement range is bigger, and time of measuring is longer, this is runed counter to actual demand, requires time of measuring more shorter better in practical measurement, surveys
Amount efficiency could improve；2, since the inhibition of practical median filter is than being limited, in the case where a broach is filtered off,
He still has residual by broach, these remaining broach also will produce modulated signal, further includes height wherein including not only single sideband singal
Rank sideband, these signals can generate and measurement result phase in photodetector with adjacent edge band or residual broach signal beat frequency
Same frequency component, the different mutual crosstalks in channel cause great measurement error；3, there are wavelength dependency, the wavelength one of carrier wave
Denier changes, it is necessary to which subsequent measuring device centre wavelength changes.
In order to realize quick measurement, one et al. is worn within 2015 in a kind of " device for measuring optical device frequency response
With method " the different two row frequency combs of repetition rate have been used in (CN 201510345041.9), the first frequency comb is as detection
Signal obtains its amplitude and phase information by device under test, and the second frequency comb is as reference signal, the first frequency comb and the
Two frequency combs beat frequency in photodetector detects letter since the repetition rate of two row frequency combs is different in each channel
It is number different from the difference on the frequency of reference signal, it can be distinguished in frequency to the amplitude and phase information in different channels.The party
The advantages of method is the amplitude and phase information that can disposably measure on the Frequency point that all first frequency combs are covered, and is suitble to survey
Measure fast-changing physical phenomenon.The disadvantages of this method：1, points are measured and is equal to frequency comb broach number, therefore resolution ratio is very
It is low, be not suitable for measuring narrow-spectrum light device；2, to ensure certain resolution ratio, then the repetition rate of frequency comb wants small, causes to survey
It is smaller to measure range, is not suitable for measuring wide range optical device；3. in order to achieve the purpose that quickly to measure, it is necessary to use time domain Receiving
(time-domain samplings such as DSP or oscillograph instrument), and higher signal-to-noise ratio and larger dynamic range cannot be obtained.
As the above analysis, while to reach wide-measuring range, high-resolution, quick measurement request be extremely difficult
's.
Invention content
The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and to provide a kind of light devices of multi-channel parallel
High-resolution, the measurement of large-scale quick high accuracy can be achieved at the same time in part spectral response measurement method and device, prevents different logical
The mutual crosstalk in road, effectively eliminate receiver frequency dependence and Modulation and Nonlinear caused by measurement error.
The present invention specifically uses following technical scheme to solve above-mentioned technical problem：
A kind of optical device spectral response measurement method of multi-channel parallel, includes the following steps：
Step 1 is prepared by the following detection optical signal：Microwave signal is modulated to the first frequency comb signal, is generated
Multichannel carrier wave inhibits light double-sideband signal, each broach of the first frequency comb signal to correspond to a channel；It then will be described more
Channel carrier inhibits light double-sideband signal to be coupled with the second frequency comb signal, generates multichannel asymmetrical beam double-sideband signal, i.e.,
For the detection optical signal；The first frequency comb signal is different from the broach frequency interval of the second frequency comb signal；
Step 2 enables detection optical signal by carrying out opto-electronic conversion after optical device to be measured, then from transformed electric signal
Spectral response of the optical device to be measured in each channel is extracted parallel；
Step 3, that amplitude-frequency response of the optical device to be measured on each channel and phase-frequency response are combined as optical device to be measured is complete
Whole spectral response.
Preferably, extracting spectral response of the optical device to be measured in each channel in step 2 parallel, the specific method is as follows：
The spectral response in each channel is extracted parallel from transformed electric signal, then from the spectral response in each channel
Removal measuring system obtains spectral response of the optical device to be measured in each channel in the spectral response of respective channel respectively.
Further, spectral response of the measuring system in each channel is obtained by following parallel method：From the detection
Optical signal separates reference signal parallel all the way, and directly to this, reference signal carries out opto-electronic conversion and from transformed telecommunications all the way
The spectral response in each channel, as spectral response of the measuring system in each channel are extracted in number parallel.
Preferably, the microwave signal is microwave sweep signal.
Preferably, the first frequency comb signal and the second frequency comb signal meet the following conditions：
|ωshift|>|(N-1)Δω′|,ifωshift<0,Δω′>0orωshift>0,Δω′<0
Wherein, ωstartIt is the angular frequency of first broach in the first frequency comb signal, ωshiftIt is the first frequency comb signal
In difference on the frequency in first broach and the second frequency comb signal between first broach, Δ ω is the broach of the first frequency comb signal
Frequency interval, Δ ω ' be the first frequency comb signal broach frequency interval and the second frequency comb signal broach frequency interval it
Between difference on the frequency, ωsampleIt is the sampling bandwidth of spectral response extraction, N is the broach number of the first frequency comb signal.
Following technical scheme can also be obtained according to identical invention thinking：
A kind of optical device spectral response measuring device of multi-channel parallel, including：
Optical signal generation module is detected, for being prepared by the following detection optical signal：Microwave signal is modulated to
One frequency comb signal generates multichannel carrier wave and light double-sideband signal, each broach of the first frequency comb signal is inhibited to correspond to one
Channel；Then multichannel carrier wave inhibition light double-sideband signal is coupled with the second frequency comb signal, it is non-right generates multichannel
Claim light double-sideband signal, the as described detection optical signal；The broach of the first frequency comb signal and the second frequency comb signal frequency
Rate interval is different；
Microwave width phase detection module, for carrying out opto-electronic conversion by detection optical signal after optical device to be measured, and from
Spectral response of the optical device to be measured in each channel is extracted in transformed electric signal parallel；
Main control unit, for amplitude-frequency response of the optical device to be measured on each channel and phase-frequency response to be combined as light to be measured
Device the whole spectrum responds.
Preferably, the microwave width phase detection module includes：
First photoelectric conversion module, for carrying out opto-electronic conversion by the detection optical signal after optical device to be measured；
First width phase extraction module, it is each for being extracted parallel from the transformed electric signal of the first photoelectric conversion module
The spectral response in channel；
Correction module, for removal to be surveyed respectively from the spectral response in each channel that the first width phase extraction module is extracted
Amount system obtains spectral response of the optical device to be measured in each channel in the spectral response of respective channel.
Further, the correction module includes：
Second photoelectric conversion module, for carrying out light to the reference signal parallel all the way separated from the detection optical signal
Electricity conversion；
Second width phase extraction module, it is each for being extracted parallel from the transformed electric signal of the second photoelectric conversion module
The spectral response of the spectral response in channel, as measuring system in each channel.
Preferably, the microwave signal is microwave sweep signal.
Preferably, the first frequency comb signal and the second frequency comb signal meet the following conditions：
|ωshift|>|(N-1)Δω′|,ifωshift<0,Δω′>0orωshift>0,Δω′<0
Wherein, ωstartIt is the angular frequency of first broach in the first frequency comb signal, ωshiftIt is the first frequency comb signal
In difference on the frequency in first broach and the second frequency comb signal between first broach, Δ ω is the broach of the first frequency comb signal
Frequency interval, Δ ω ' be the first frequency comb signal broach frequency interval and the second frequency comb signal broach frequency interval it
Between difference on the frequency, ωsampleIt is the sampling bandwidth of spectral response extraction, N is the broach number of the first frequency comb signal.
Compared with prior art, the invention has the advantages that：
1 while realizing wide-measuring range, high-resolution, quick measurement request；2, with previous serial measurement method
Unlike, parallel measurement so that time of measuring is unrelated with number of channels, if the time for measuring a channel is T, measures N number of
The time in channel remains as T；3, the detectable signal in different channels has different frequencies after being converted into an electric signal, has prevented not
The problem of with channels crosstalk；4, measuring not high-order sideband caused by by Modulation and Nonlinear is influenced；5, measurement range greatly improves,
If using N root frequency combs, measurement range is expanded into 2N times；6, measuring system changes without wavelength dependency, optical source wavelength, subsequently
Measuring device is without being adjusted.
Description of the drawings
Fig. 1 is the principle schematic diagram of one preferred embodiment of optical device spectral response measuring device of the present invention；
Fig. 2 is the structural schematic diagram of frequency comb module in preferred embodiment；
Fig. 3 is the signal hint at different location in Fig. 1 devices；
The measurement result that Fig. 4 is frequency comb broach number when being 3；
The measurement result that Fig. 5 is frequency comb broach number when being 5；
Fig. 6 is the structural schematic diagram of another embodiment of optical device spectral response measuring device of the present invention.
Specific implementation mode
In view of the shortcomings of the prior art, the thinking of the present invention is that the optical device based on asymmetric double sideband modulation measures existing
On the basis of method, using the different frequency comb signal of two groups of broach frequency intervals, to generate, multichannel asymmetrical beam is bilateral to take a message
Number；It is different logical in multichannel asymmetrical beam double-sideband signal since the broach frequency interval of two groups of frequency comb signals is different
The double-sideband signal in road is different from the corresponding difference on the frequency of local oscillation signal, then the two beat frequency in photodetector is converted into electric signal
Frequency afterwards is different, the signal aliasing in different channels is avoided, in this way, the spectral response entrained by multiple channel detection signals can
It is received in parallel, and solves the problems, such as multi channel signals crosstalk and the error that Modulation and Nonlinear introduces, so as to be substantially improved
Measurement efficiency and measurement accuracy.
Specifically, the optical device spectral response measurement method of the multi-channel parallel of the present invention, includes the following steps：Step
1, it is prepared by the following detection optical signal：Microwave signal is modulated to the first frequency comb signal, generates the suppression of multichannel carrier wave
Each broach of light double-sideband signal processed, the first frequency comb signal corresponds to a channel；Then the multichannel carrier wave is inhibited
Light double-sideband signal is coupled with the second frequency comb signal, generates multichannel asymmetrical beam double-sideband signal, the as described detection light
Signal；The first frequency comb signal is different from the broach frequency interval of the second frequency comb signal；
Step 2 enables detection optical signal by carrying out opto-electronic conversion after optical device to be measured, then from transformed electric signal
Spectral response of the optical device to be measured in each channel is extracted parallel；
Step 3, that amplitude-frequency response of the optical device to be measured on each channel and phase-frequency response are combined as optical device to be measured is complete
Whole spectral response.
The optical device spectral response measuring device of the multi-channel parallel of the present invention, including：
Optical signal generation module is detected, for being prepared by the following detection optical signal：Microwave signal is modulated to
One frequency comb signal generates multichannel carrier wave and light double-sideband signal, each broach of the first frequency comb signal is inhibited to correspond to one
Channel；Then multichannel carrier wave inhibition light double-sideband signal is coupled with the second frequency comb signal, it is non-right generates multichannel
Claim light double-sideband signal, the as described detection optical signal；The broach of the first frequency comb signal and the second frequency comb signal frequency
Rate interval is different；
Microwave width phase detection module, for carrying out opto-electronic conversion by detection optical signal after optical device to be measured, and from
Spectral response of the optical device to be measured in each channel is extracted in transformed electric signal parallel；
Main control unit, for amplitude-frequency response of the optical device to be measured on each channel and phase-frequency response to be combined as light to be measured
Device the whole spectrum responds.
In above technical scheme, the microwave signal can be that fixed frequency microwave signal can also be swept-frequency signal, excellent
Choosing uses swept-frequency signal, so as to further expand measurement range.
In order to allow the detectable signal for being converted into electric signal to be arranged according to certain rule, and eliminate the problem of frequency is overlapped, institute
It states the first frequency comb signal and the second frequency comb signal preferably meets the following conditions：
|ωshift|>|(N-1)Δω′|,ifωshift<0,Δω′>0orωshift>0,Δω′<0
Wherein, ωstartIt is the angular frequency of first broach in the first frequency comb signal, ωshiftIt is the first frequency comb signal
In difference on the frequency in first broach and the second frequency comb signal between first broach, Δ ω is the broach of the first frequency comb signal
Frequency interval, Δ ω ' be the first frequency comb signal broach frequency interval and the second frequency comb signal broach frequency interval it
Between difference on the frequency, ωsampleIt is the sampling bandwidth of spectral response extraction, N is the broach number of the first frequency comb signal.
In above-mentioned technical proposal, the spectral response in each channel extracted parallel from transformed electric signal is actually
Be optical device to be measured combines response with measuring system, it is therefore necessary to be calibrated, i.e., is rung from the frequency spectrum in each channel
Spectral response of the measuring system in respective channel is removed in answering respectively, obtains spectral response of the optical device to be measured in each channel.
Conventional measuring system calibration method is that the above measurement process is repeated in the case of not accessing optical device to be measured, to be surveyed
Spectral response of the amount system in each channel.But this calibration program can change (such as due to the fluctuation of light source power, measuring environment
Environment shake, temperature change etc.) etc. time-varying disturbing factor cause calibrate effect it is undesirable.To solve this problem, the present invention is logical
It crosses following parallel method and obtains spectral response of the measuring system in each channel in real time：It is separated all the way simultaneously from the detection optical signal
Capable reference signal, directly to this, reference signal carries out opto-electronic conversion and is extracted parallel from transformed electric signal every all the way
The spectral response of the spectral response in a channel, as measuring system in each channel.From the measurement result of parallel optical path
The measurement result of middle removal reference path, you can completely eliminate the common noise of two-way.Using this parallel reference calibration program,
Obtained system spectrum sound will not be impacted due to factors such as light source power fluctuation, measuring environment variations.
For the ease of public understanding, come to technical scheme of the present invention below by a preferred embodiment and in conjunction with attached drawing
It is described in detail：
The basic structure of measuring device in this preferred implementation is as shown in Figure 1.It includes for generating frequency comb 1, optical frequency
The frequency comb module and microwave source, modulation module, photodetector 1, photodetector 2, width phase extraction module 1, width of comb 2
Phase extraction module 2, control and data processing module.Frequency comb 1, the broach frequency interval of frequency comb 2 are different.
As shown in Figure 1, the microwave signal that microwave source exports is modulated to frequency comb 1 by modulation module, the load of multichannel is generated
Wave inhibits light double-sideband signal, each broach to correspond to a channel；Then the multichannel carrier wave is inhibited into light double-sideband signal
It is coupled with frequency comb 2, generates multichannel asymmetrical beam double-sideband signal；Multichannel asymmetrical beam double-sideband signal is divided into two
Road, all the way as detection optical signal, another way, which is used as, refers to signal；In detection light path, detection optical signal passes through optical device to be measured
Afterwards, the asymmetrical beam double-sideband signal in each channel carries the response messages such as the amplitude, phase, polarization of optical device to be measured,
After being converted to electric signal by photodetector 1, the response message in each channel is extracted parallel by width phase extraction module 1
Come；In reference path, multichannel asymmetrical beam double-sideband signal is without optical device to be measured, but directly by photodetector 2
After being converted to electric signal, the response message in each channel is extracted parallel by width phase extraction module 2；To detect light path institute
Obtained multichannel response message combines response as optical device to be measured and measuring system, the multichannel obtained with reference path
Response of the response message as measuring system, control and data processing module remove the response of measuring system in being responded from joint,
Spectral response of the optical device to be measured in each channel is obtained, is combined, you can obtains the complete frequency of optical device to be measured
Spectrum response.
Microwave source in the present embodiment is microwave swept frequency source, produces microwave sweep signal.
Frequency comb 1 and frequency comb 2 can be used existing various frequency comb generation methods and generate, in order to improve the matter for generating signal
It measures and reduces cost of implementation, two frequency comb signals are generated using frequency comb module shown in Fig. 2 in the present embodiment.Such as Fig. 2
It is shown, the optical signal of light source output is divided into two-way, passes through modulator 1 all the way, is modulated, generates by the microwave source that frequency is Δ ω
Repetition rate is the frequency comb 1 (broach that the sideband of generation is regarded as to frequency comb) of Δ ω；Another way (ensures after frequency shifter
The broach of two row frequency combs is not overlapped on frequency), it is modulated by the microwave source that frequency is Δ ω+Δ ω ', generates repetition rate
For the frequency comb 2 of Δ ω+Δ ω '.
It is entirely different with double frequency comb measurement methods for wearing one, frequency comb 1 itself of the invention not as detectable signal,
But modulated in the modulator by microwave source, the light double-sideband signal in N (1 broach number of frequency comb) a channel is generated, this N number of ± 1
Rank sideband signals are as detectable signal, amplitude response and phase response for detecting n-th of channel, the variation of each sideband
Range is the half of 1 repetition rate of frequency comb.Since the frequency resolution of microwave source is very high, Measurement Resolution can be significantly
It improves, theoretically can reach Hz magnitudes；Frequency comb 2 is used as local oscillation signal, and n-th broach is considered as frequency comb 1 in frequency comb 2
In n-th of channel carrier have passed through the shift frequency of a fixed frequency, frequency comb 2 and the light in N number of channel that frequency comb 1 generates are bilateral
After band signal coupling, the asymmetrical beam double-sideband signal in N number of channel can be obtained；Asymmetrical beam double-sideband signal is by waiting for Photometer
The response messages such as upper its amplitude, phase, polarization are carried after part, after electric signal is converted to by photodetector；Due to 1 He of frequency comb
2 repetition rate of frequency comb is different, the frequency of ± 1 rank sideband and carrier wave after shift frequency in different channels in asymmetrical beam double-sideband signal
Poor different, then the two beat frequency in photodetector is converted into the frequency difference after electric signal, avoids the signal in different channels
Aliasing solves residual broach and high-order sideband in the measurement method based on frequency comb and single-side belt of Xue Min and draws to measurement result
The problem of entering error, amplitude response and phase response to make multiple channel detection signals carry can be by amplitude-phase receivers
It is parallel to receive.The spectral response in each channel is spliced, overall magnitude response and the phase response of optical device to be measured can be obtained.We
Method available frequency domain Receiving is realized, that is, uses the spectrum analysis instruments such as vector network analyzer as amplitude-phase extraction mould
Block, therefore can realize higher signal-to-noise ratio and larger dynamic range.
In order to make the public more clearly understand technical solution of the present invention, briefly it is situated between to the measuring principle of the present invention below
It continues：
The different frequency comb signal E of two groups of broach frequency intervalsOFC1And EOFC2It can be expressed as：
Wherein, anAnd bnIt is amplitude, φ is frequency comb OFC1And OFC2Initial phase difference, ωstartIt is OFC1First load
The angular frequency of wave (broach for being modulated with microwave signal), ωshiftIt is OFC1First carrier wave and OFC2The frequency of first carrier wave
Rate is poor, and Δ ω is OFC1Repetition rate (i.e. broach frequency interval), Δ ω+Δ ω ' is OFC2Repetition rate.Turn to allow
The detectable signal for changing electric signal into is arranged according to certain rule, and eliminates the problem of frequency is overlapped, and two groups of frequency comb signals are best
Meet the following conditions：
|ωshift|>|(N-1)Δω′|,ifωshift<0,Δω′>0orωshift>0,Δω′<0
Wherein ωsampleIt is the sampling bandwidth of width phase extraction module.
Assuming that n-th frequency comb OFC1And OFC2Angular frequency can be expressed as ωnWith ω 'n, there is ωn=ωstart+(n-1)
Δ ω, ω 'n=(ωstart+ωshift)+(n-1)Δω′.Frequency comb OFC1The Double Sideband Suppressed Carrier letter generated after being modulated
Number with frequency comb OFC2Become asymmetrical beam double-sideband signal after coupling, can be expressed as
Wherein, ωeIt is the angular frequency of microwave source, A-nAnd A+nIt is OFC1N-th of carrier wave corresponds to the amplitude of frequency sweep sideband.It is non-right
Claim light double-sideband signal to be divided into and measures road and reference arm.
Road is being measured, optical signal passes through device under test, and the amplitude response and phase response of the upper device under test of carryings export and believe
Number it can be expressed as
Wherein H (ω)=Hsys(ω)·HDUT(ω),Hsys(ω) and HDUT(ω) is system and the biography of device under test respectively
Defeated function.After opto-electronic conversion, OFC can be obtained1In n-th of carrier wave both sides spectral response：
Wherein η is the responsiveness of photodetector.
In reference arm, there is device transmission response H to be measuredDUTThe spectral response of system can be obtained in (ω)=1
According to formula (6) and formula (7), the transfer function H of device under test can getDUT(ω)：
Wherein H (| ωn-ωe|) and H (ωo+ωe) it is device under test in OFC1The spectral response in n-th of channel, and H*
(ω ') is a constant.Fig. 3 shows the signal at A~E in Fig. 1 measuring devices.
In order to verify the effect of above-mentioned apparatus, Proof-Of Principle experiment is carried out, experimental result is as shown in Figure 4, Figure 5.
The frequency sweep microwave source that bandwidth is 10GHz and the amplitude-phase extraction module that bandwidth is 10GHz are used in experiment, if using 3
The measurement range of 60GHz then can be achieved in frequency comb, if using 5 frequency combs, the measurement range of 100GHz, and two can be achieved
The time of measuring of a measurement experiment is identical.It should be noted that frequency comb radical is more, in the case where general power is certain, often
With regard to smaller, dynamic range and signal-to-noise ratio can be reduced responsively the power of a piece frequency comb.The signal-to-noise ratio of measurement result as shown in Figure 4
It is higher than shown in fig. 5.
Fig. 6 shows another embodiment of optical device spectral response measuring device of the present invention.The area of the embodiment and Fig. 1
It is not not use parallel reference light path, it is therefore desirable to be calibrated using conventional method, the frequency spectrum to remove measuring system is rung
It answers.The rest part and basic principle of the device are identical as Fig. 1 shown devices, and details are not described herein again.
Claims (10)
1. a kind of optical device spectral response measurement method of multi-channel parallel, which is characterized in that include the following steps：
Step 1 is prepared by the following detection optical signal：Microwave signal is modulated to the first frequency comb signal, is generated mostly logical
Road carrier wave inhibits light double-sideband signal, each broach of the first frequency comb signal to correspond to a channel；Then by the multichannel
Carrier wave inhibits light double-sideband signal to be coupled with the second frequency comb signal, generates multichannel asymmetrical beam double-sideband signal, as institute
State detection optical signal；The first frequency comb signal is different from the broach frequency interval of the second frequency comb signal；
Step 2 enables detection optical signal by carrying out opto-electronic conversion after optical device to be measured, then parallel from transformed electric signal
Extract spectral response of the optical device to be measured in each channel；
Step 3, that amplitude-frequency response of the optical device to be measured on each channel and phase-frequency response are combined as optical device to be measured is complete
Spectral response.
2. method as described in claim 1, which is characterized in that extract optical device to be measured in step 2 parallel in each channel
The specific method is as follows for spectral response：Extract the spectral response in each channel parallel from transformed electric signal, then from
Spectral response of the measuring system in respective channel is removed in the spectral response in each channel respectively, optical device to be measured is obtained and exists
The spectral response in each channel.
3. method as claimed in claim 2, which is characterized in that spectral response of the measuring system in each channel passes through following parallel
Method obtains：Reference signal parallel all the way is separated from the detection optical signal, directly reference signal carries out photoelectricity all the way to this
The spectral response in each channel is converted and is extracted parallel from transformed electric signal, as measuring system is in each channel
Spectral response.
4. method as described in claim 1, which is characterized in that the microwave signal is microwave sweep signal.
5. such as any one of Claims 1 to 4 the method, which is characterized in that the first frequency comb signal and the second frequency comb
Signal meets the following conditions：
|ωshift|>|(N-1)Δω′|,if ωshift<0,Δω′>0 or ωshift>0,Δω′<0
Wherein, ωstartIt is the angular frequency of first broach in the first frequency comb signal, ωshiftIt is in the first frequency comb signal
Difference on the frequency in one broach and the second frequency comb signal between first broach, Δ ω are the broach frequencies of the first frequency comb signal
Interval, Δ ω ' is between the broach frequency interval of the first frequency comb signal and the broach frequency interval of the second frequency comb signal
Difference on the frequency, ωsampleIt is the sampling bandwidth of spectral response extraction, N is the broach number of the first frequency comb signal.
6. a kind of optical device spectral response measuring device of multi-channel parallel, which is characterized in that including：
Optical signal generation module is detected, for being prepared by the following detection optical signal：Microwave signal is modulated to the first light
Frequency comb signal generates multichannel carrier wave and light double-sideband signal, each broach of the first frequency comb signal is inhibited to correspond to a channel；
Then multichannel carrier wave inhibition light double-sideband signal is coupled with the second frequency comb signal, it is double generates multichannel asymmetrical beam
Sideband signals, the as described detection optical signal；The broach frequency interval of the first frequency comb signal and the second frequency comb signal
It is different；
Microwave width phase detection module, for carrying out opto-electronic conversion by detection optical signal after optical device to be measured, and from conversion
Spectral response of the optical device to be measured in each channel is extracted in electric signal afterwards parallel；
Main control unit, for amplitude-frequency response of the optical device to be measured on each channel and phase-frequency response to be combined as optical device to be measured
The whole spectrum responds.
7. device as claimed in claim 6, which is characterized in that the microwave width phase detection module includes：
First photoelectric conversion module, for carrying out opto-electronic conversion by the detection optical signal after optical device to be measured；
First width phase extraction module, for extracting each channel parallel from the transformed electric signal of the first photoelectric conversion module
Spectral response；
Correction module, for removal to measure system respectively from the spectral response in each channel that the first width phase extraction module is extracted
It unites in the spectral response of respective channel, obtains spectral response of the optical device to be measured in each channel.
8. device as claimed in claim 7, which is characterized in that the correction module includes：
Second photoelectric conversion module turns for carrying out photoelectricity to the reference signal parallel all the way separated from the detection optical signal
It changes；
Second width phase extraction module, for extracting each channel parallel from the transformed electric signal of the second photoelectric conversion module
Spectral response, as spectral response of the measuring system in each channel.
9. device as claimed in claim 6, which is characterized in that the microwave signal is microwave sweep signal.
10. such as any one of claim 6~9 described device, which is characterized in that the first frequency comb signal and the second frequency comb
Signal meets the following conditions：
|ωshift|>|(N-1)Δω′|,if ωshift<0,Δω′>0 or ωshift>0,Δω′<0
Wherein, ωstartIt is the angular frequency of first broach in the first frequency comb signal, ωshiftIt is in the first frequency comb signal
Difference on the frequency in one broach and the second frequency comb signal between first broach, Δ ω are the broach frequencies of the first frequency comb signal
Interval, Δ ω ' is between the broach frequency interval of the first frequency comb signal and the broach frequency interval of the second frequency comb signal
Difference on the frequency, ωsampleIt is the sampling bandwidth of spectral response extraction, N is the broach number of the first frequency comb signal.
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