CN109412687A - A kind of optical path time delay rapid measurement device based on frequency domain standing wave method - Google Patents
A kind of optical path time delay rapid measurement device based on frequency domain standing wave method Download PDFInfo
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- CN109412687A CN109412687A CN201811330173.4A CN201811330173A CN109412687A CN 109412687 A CN109412687 A CN 109412687A CN 201811330173 A CN201811330173 A CN 201811330173A CN 109412687 A CN109412687 A CN 109412687A
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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
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
- H04B10/0795—Performance monitoring; Measurement of transmission parameters
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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
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
- H04B10/0795—Performance monitoring; Measurement of transmission parameters
- H04B10/07953—Monitoring or measuring OSNR, BER or Q
-
- 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
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2507—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion
-
- 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
- H04B10/66—Non-coherent receivers, e.g. using direct detection
- H04B10/67—Optical arrangements in the receiver
- H04B10/671—Optical arrangements in the receiver for controlling the input optical signal
- H04B10/675—Optical arrangements in the receiver for controlling the input optical signal for controlling the optical bandwidth of the input signal, e.g. spectral filtering
-
- 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
- H04B10/66—Non-coherent receivers, e.g. using direct detection
- H04B10/69—Electrical arrangements in the receiver
- H04B10/697—Arrangements for reducing noise and distortion
Abstract
The invention discloses a kind of optical path time delay rapid measurement device based on frequency domain standing wave method, the device passes through modulation frequency comb signal repetition rate, frequency comb signal passes through optical path to be measured and reference path, and then by the frequency domain standing wave method behind photosynthetic road, realizes that the high-precision of optical path time delay quickly detects.The present invention uses repetition rate fast tunable optical frequency com signal generator, and the frequency comb signal of transmitting low phase noise, extremely low clock jitter improves the accuracy of measurement, and realize rapid survey；The present invention is using frequency comb signal as carrier signal simultaneously, occupy certain spectral width in area of light, when reference path and optical path optical path difference to be measured meet certain minimum value, two ways of optical signals is noncoherent in area of light after three-dB coupler synthesizes, thus the signal strength of its synthesis not will receive the influence of two-way random phase drift, and system rejection to disturbance ability is strong.
Description
Technical field
The invention belongs to light time delay field of measuring technique, and in particular to a kind of optical path time delay based on frequency domain standing wave method is quick
Measuring device.
Background technique
In optical communications, when signal is by inevitably generating time delay when a certain Transmission system；Because of the time delay of system
Characteristic determines the distortion situation of signal, so requirement of the communication system to time delay is increasingly stringenter.The side of many measurement distances
Method also all relies on the measurement of time delay, therefore the accurate measurement of light time delay becomes a research hotspot.
Measurement optical signal method of time delay in transmission link has time domain impulse method, PGC (phase generation carrier wave skill at present
Art) homodyne detection method, optical interferometry, optical frequency domain reflectometry (OFDR), the microwave interference method (OCMI) based on light carrier,
In:
Enter reference path and optical path to be measured using laser pulse in time domain impulse method, uses high-speed signal acquisition instrument pair
Interference output signal is acquired, and measures the time difference between the pulse through two optical paths, calculates optical path time delay；But this method is to sharp
Light device and the performance requirement of acquisition equipment are very high.
PGC homodyne detection method is using adding the mode of DC voltage to carry out arm length difference compensation, in reference path and light to be measured
Road adds different voltages, so that equivalent optical path delay inequality is identical, then calculates two by calculating the voltage difference of two-arm
Optical path time delay；But this method measurement range is small, and when use also receives a variety of limitations.
In addition White Light Interferometer introduces reference path delay volume by the position of the reflecting mirror in adjusting white light interferometer,
When reference path time delay and optical path time delay to be measured are fully compensated, two-way interference of light output signal is maximum, by read it is mobile away from
From calculation delay amount；This method is compensated by adjusting reflecting mirror, and measurement accuracy and measurement range are regulated device
Limitation.
Light source output linear frequency sweep optical signal is divided into two-way in OFDR technology, and optical signal is anti-after reference path all the way
It penetrates, optical signal passes through optical path to be measured all the way, using Rayleigh scattering present in optical path to be measured and Fresnel reflection, if propagating length
Degree meets the coherent condition of light, then signal light and reference light will be mixed on the photosurface of photodetector；Light to be measured
The frequency size of photoelectric current corresponding to Rayleigh beacon signal on fibre at any point is then proportional to scattering point position,
That is paths time delay；Photodetector will export the photoelectric current of corresponding frequencies, and amplitude proportional is backward scattered at optical fiber x
The size of coefficient and optical power is penetrated, to obtain the scatter attenuation characteristic along testing fiber everywhere, while test frequency can be passed through
The maximum value of rate derives the time delay in optical path to be measured；This method measurement accuracy is higher, but its measurement range is very small.
OCMI technology carries out Fourier transformation by the radiofrequency signal being modulated on light carrier using vector network analyzer
And computing cross-correlation, the delay inequality of input signal and output signal is determined by the peak position of correlation values；This method measurement essence
Degree is high and measurement range is big, but its technical pattern is complicated, and measuring speed is slow.
Summary of the invention
In view of above-mentioned, the present invention provides a kind of optical path time delay rapid measurement device based on frequency domain standing wave method, the device
By modulating frequency comb signal repetition rate, frequency comb signal passes through optical path to be measured and reference path, and then by behind photosynthetic road
Frequency domain standing wave method, realize optical path time delay high-precision quickly detect.
A kind of optical path time delay rapid measurement device based on frequency domain standing wave method, including light comb generator, optical splitter, light to be measured
Road, reference path, combiner, photodetector, amplifier, envelope detector, low-pass filter, analog-digital converter, processor
And radio-frequency signal source；Wherein:
The light comb generator is for generating frequency comb signal and being input to optical splitter；
The optical splitter is used to carry out power to frequency comb signal to divide equally, generate the identical frequency comb signal F1 of two-way and
F2 is separately input into optical path and reference path to be measured；
The combiner is used to the output signal of optical path to be measured and reference path synthesizing optical signal F3, is input to photoelectricity spy
Survey device；
The photodetector is for being converted into electric signal R1 for optical signal F3 and being input to amplifier；
The amplifier is used to be input to envelope detector after carrying out signal amplification to electric signal R1；
The envelope detector is used to carry out amplified electric signal R1 envelope detection, its signal strength of rapidly extracting letter
Breath, to generate electric signal R2；
The low-pass filter is used to carry out low-pass filtering to electric signal R2；
The analog-digital converter obtains digital signal for sampling to filtered electric signal R2；
The processor obtains the relative time delay of optical path to be measured Yu reference path signal for analyzing digital signal
Difference, and according to the output signal frequency of relative time delay difference control radio-frequency signal source；
The radio-frequency signal source is used for the adjustable radiofrequency signal of output frequency to light comb generator, to control light comb generator
Repetition rate.
Further, the light comb generator uses low phase noise, extremely low clock jitter and repetition rate fast tunable
Frequency comb signal source.
Further, the optical splitter uses 3dB photo-coupler, realizes dividing equally for optical power.
Further, the optical path difference of the reference path and optical path to be measured meets certain minimum value, makes two ways of optical signals
After combiner synthesizes in area of light be it is noncoherent, the signal strength of synthesis not will receive two ways of optical signals random phase
The influence of drift synthesizes electric signal R1 by the stable electrical domain vector that photoelectric conversion two ways of optical signals generates, for fixation
The two ways of optical signals of light time delay difference can obtain the uniform pectination of frequency interval on frequency domain after synthesis in photodetector
Structure.
Further, the photodetector uses wideband photodetectors.
Further, the bandwidth of the low-pass filter is set as the frequency exported comprising timing_delay estimation device, to guarantee
Measurement sensitivity, and have fine inhibiting effect to clutter distortion components in output signal.
Further, the envelope detector use envelope detection technique, relative to common phase-detecting scheme without
Electrical domain mixer architecture avoids electronics frequency mixer bring phase with temperature drift, phase with the relativity problem of frequency, has
Conducive to the sensitivity and stability for improving detection, and realize quickly detection.
Further, the analog-digital converter uses 8~24 analog-digital converters.
Further, the processor extracts the standing wave information in digital signal, by analyzing modulated microwave frequency and adopting
Collect the relationship of signal, to obtain optical path to be measured and the relative time delay of reference path signal is poor, and according to the relative time delay difference control
The output signal frequency of radio-frequency signal source processed.
Apparatus of the present invention use repetition rate fast tunable optical frequency com signal generator, transmitting low phase noise, it is extremely low when
The frequency comb signal of clock shake, improves the accuracy of measurement, and realize rapid survey；The present invention is made using frequency comb signal simultaneously
For carrier signal, certain spectral width is occupied in area of light, when reference path and optical path optical path difference to be measured meet centainly most
When small value, two ways of optical signals is noncoherent in area of light after three-dB coupler synthesizes, thus the signal strength of its synthesis is not
It will receive the influence of two-way random phase drift, system rejection to disturbance ability is strong；And apparatus of the present invention and used frequency domain standing wave method into
Row latency measurement makes structure become simpler, big to the range of time delay detection.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of optical path time delay rapid measurement device of the present invention.
Specific embodiment
In order to more specifically describe the present invention, with reference to the accompanying drawing and specific embodiment is to technical solution of the present invention
It is described in detail.
As shown in Figure 1, base optical path time delay rapid measurement device of the present invention includes: light comb generator 1, optical splitter 2, light to be measured
Road 3, reference path 4, combiner 5, photodetector 6, amplifier 7, envelope detector 8, low-pass filter 9, analog-digital converter
10, processor 11, radio-frequency signal source 12；Wherein: light comb generator 1 is used to emit the light of low phase noise, extremely low clock jitter
Frequency comb signal, is input to optical splitter 2；Optical splitter 2 is used to carry out power to frequency comb signal to divide equally, the identical optical frequency of output two-way
Signal F1 and F2 are combed, is input to optical path 3 to be measured all the way, another way is input to reference path 4；Combiner 5 is used for optical path 3 to be measured
Optical signal F3 is synthesized with the output signal of reference path 4, is input to photodetector 6；Photodetector 6 is used for optical signal F3
It is converted into electric signal R1, is input to amplifier 7；Amplifier 7 is used to carry out signal amplification to electric signal R1, is input to envelope detection
Device 8；Envelope detector 8 be used for amplified electric signal R1 carry out envelope detection, its signal strength information of rapidly extracting to
Export electric signal R2；Low-pass filter 9 is used to carry out low-pass filtering to electric signal R2；Analog-digital converter 10 is used for filtered
Electric signal R2 is sampled, and digital signal is obtained；Processor 11 for analyzing digital signal, obtain optical path 3 to be measured with
4 signal relative time delay of reference path is poor, by controlling the frequency of radio-frequency signal source 12, realizes the repetition rate of frequency comb signal source
Adjusting, the two ways of optical signals of fixed light time delay difference can be obtained on frequency domain after synthesizing on photodetector 6
The uniform pectinate texture of frequency interval；12 output frequency of radio-frequency signal source is adjustable, for controlling the repetition frequency of light comb generator 1
Rate.
In present embodiment, light comb generator 1 is using low phase noise, extremely low clock jitter and repetition rate fast tunable
Frequency comb signal source；Optical splitter 2 uses 3dB photo-coupler, realizes dividing equally for optical power；Reference path 4 and 3 light of optical path to be measured
Path difference meets certain minimum value, and making two ways of optical signals is noncoherent, synthesis in area of light after three-dB coupler synthesizes
Signal strength not will receive two-way random phase drift influence, by photoelectric conversion two paths of signals generate stable electrical domain
Vector modulation signal R1；Photodetector 6 uses wideband photodetectors；9 bandwidth of low-pass filter is set as comprising timing_delay estimation
The frequency that device is exported to guarantee measurement sensitivity, and has fine inhibiting effect to clutter distortion components in output signal；Packet
Network wave detector 8 avoids electricity relative to common phase-detecting scheme without electrical domain mixer architecture using envelope detection technique
Sub- frequency mixer bring phase with temperature drift, phase with frequency relativity problem, be conducive to improve detection sensitivity with
Stability, and realize quickly detection；Analog-digital converter 10 uses 8 to 24 analog-digital converters；Processor 11 extracts digital letter
Standing wave information in number, pass through analysis modulated microwave frequency and acquisition signal relation, so that it may obtain reference path 4 with it is to be measured
The relative time delay of optical path 3 is poor, and controls 12 output frequency of radio-frequency signal source.
The working principle of present embodiment are as follows: pass through photosynthetic road by optical path to be measured and reference path using frequency comb signal
Frequency domain standing wave method afterwards, realizes the measurement of two optical path delay inequalitys.As shown in Figure 1, the frequency comb of repetition rate fast tunable is believed
Number it is divided into two-way after optical splitter, routing fiber adapter therein connects optical path to be measured, and another way connects reference path,
Two-way light is output to optical detector after realizing combining by three-dB coupler on optical fiber；Since frequency comb signal occupies in area of light
Certain spectral width, when reference path meets certain minimum value with optical path optical path difference to be measured, two ways of optical signals passes through 3dB
It is noncoherent in area of light after coupler synthesis, thus the signal strength of its synthesis not will receive the drift of two-way random phase
It influences, the stable electrical domain Vector modulation generated by photoelectric conversion two paths of signals.
When via the two way microwave signals phase of optical path to be measured and reference path, there is maximum detection signal width
Degree；When two way microwave signals phase is reversed, there is the smallest signal amplitude.In the case that light time delay to be measured immobilizes,
The phase difference of this two way microwave signals is just related with microwave frequency, can obtain photoelectricity by changing modulated microwave frequency in this way
The regular corresponding variation of the phase difference of two way microwave signals after detection:
Wherein: f is microwave frequency, and Δ T is poor for the relative time delay of optical path to be measured and reference path；When two-phase potential difference meets 2K
When π+π (K is integer), a series of minimums of available photoelectric detecting signal amplitude, the corresponding microwave of these minimum points
Frequency meets:
Wherein: N is integer；Therefore pass through the signal relation of analysis modulated microwave frequency and acquisition, so that it may obtain to be measured
The relative time delay of optical path and reference path is poor；By quickly adjusting the repetition rate of frequency comb signal source, for fixed light time delay
The two ways of optical signals of difference can obtain the uniform pectinate texture of frequency interval on frequency domain after synthesis on photoelectric detector.
In technology realization, as long as detecting the difference on the frequency between two neighboring minimum, so that it may realize that this relative time delay is poor
Measurement.During real system is realized, the microwave signal of photodetection after signal amplifies directly by envelope detector and
Low frequency signal is converted to after low-pass filtering, carries out data sampling quantification treatment in low-frequency range.
The above-mentioned description to embodiment is for that can understand and apply the invention convenient for those skilled in the art.
Person skilled in the art obviously easily can make various modifications to above-described embodiment, and described herein general
Principle is applied in other embodiments without having to go through creative labor.Therefore, the present invention is not limited to the above embodiments, ability
Field technique personnel announcement according to the present invention, the improvement made for the present invention and modification all should be in protection scope of the present invention
Within.
Claims (8)
1. a kind of optical path time delay rapid measurement device based on frequency domain standing wave method, it is characterised in that: including light comb generator, light splitting
Device, optical path to be measured, reference path, combiner, photodetector, amplifier, envelope detector, low-pass filter, analog-to-digital conversion
Device, processor and radio-frequency signal source；Wherein:
The light comb generator is for generating frequency comb signal and being input to optical splitter；
The optical splitter is used to carry out power to frequency comb signal to divide equally, generates the identical frequency comb signal F1 and F2 of two-way, point
It is not input to optical path and reference path to be measured；
The combiner is used to the output signal of optical path to be measured and reference path synthesizing optical signal F3, is input to photodetection
Device；
The photodetector is for being converted into electric signal R1 for optical signal F3 and being input to amplifier；
The amplifier is used to be input to envelope detector after carrying out signal amplification to electric signal R1；
The envelope detector is used for amplified electric signal R1 progress envelope detection, its signal strength information of rapidly extracting,
To generate electric signal R2；
The low-pass filter is used to carry out low-pass filtering to electric signal R2；
The analog-digital converter obtains digital signal for sampling to filtered electric signal R2；
The processor is used to analyze digital signal, obtains optical path to be measured and the relative time delay of reference path signal is poor,
And the output signal frequency of radio-frequency signal source is controlled according to the relative time delay difference；
The radio-frequency signal source is used for the adjustable radiofrequency signal of output frequency to light comb generator, to control the weight of light comb generator
Complex frequency.
2. optical path time delay rapid measurement device according to claim 1, it is characterised in that: the light comb generator is using low
The frequency comb signal source of phase noise, extremely low clock jitter and repetition rate fast tunable.
3. optical path time delay rapid measurement device according to claim 1, it is characterised in that: the optical splitter uses 3dB light
Coupler realizes dividing equally for optical power.
4. optical path time delay rapid measurement device according to claim 1, it is characterised in that: the reference path and light to be measured
The optical path difference on road meets certain minimum value, make two ways of optical signals in area of light be after combiner synthesizes it is noncoherent,
The signal strength of synthesis not will receive the influence of two ways of optical signals random phase drift.
5. optical path time delay rapid measurement device according to claim 1, it is characterised in that: the photodetector is using wide
Band photodetector.
6. optical path time delay rapid measurement device according to claim 1, it is characterised in that: the envelope detector is using packet
Network detection techniques.
7. optical path time delay rapid measurement device according to claim 1, it is characterised in that: the analog-digital converter uses 8
~24 analog-digital converters.
8. optical path time delay rapid measurement device according to claim 1, it is characterised in that: the processor extracts number letter
Standing wave information in number, by the relationship of analysis modulated microwave frequency and acquisition signal, to obtain optical path to be measured and reference light
The relative time delay of road signal is poor, and the output signal frequency of radio-frequency signal source is controlled according to the relative time delay difference.
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| CN113055108A (en) * | 2021-01-18 | 2021-06-29 | 浙江大学 | Method and device for measuring group delay of frequency mixer |
| CN113395107A (en) * | 2021-06-11 | 2021-09-14 | 北京工业大学 | Method and device for measuring radio frequency parameters of electro-optic phase modulator |
| CN113395107B (en) * | 2021-06-11 | 2022-05-24 | 北京工业大学 | Method and device for measuring radio frequency parameters of electro-optic phase modulator |
| CN114184839A (en) * | 2021-12-10 | 2022-03-15 | 江苏集萃智能集成电路设计技术研究所有限公司 | ADC frequency spectrum testing method for inhibiting signal source jitter |
| CN114184839B (en) * | 2021-12-10 | 2024-03-01 | 江苏集萃智能集成电路设计技术研究所有限公司 | ADC frequency spectrum testing method for inhibiting signal source jitter |
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