CN106788735B - Tunable true delay experimental provision and method based on discrete chirped fiber grating - Google Patents
Tunable true delay experimental provision and method based on discrete chirped fiber grating Download PDFInfo
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- CN106788735B CN106788735B CN201611141434.9A CN201611141434A CN106788735B CN 106788735 B CN106788735 B CN 106788735B CN 201611141434 A CN201611141434 A CN 201611141434A CN 106788735 B CN106788735 B CN 106788735B
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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
- H04B10/25—Arrangements specific to fibre transmission
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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
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Abstract
The invention discloses a kind of tunable true delay experimental provision and method based on discrete chirped fiber grating, the light that tunable laser and laser with fixed wavelength are simultaneously emitted by, after microwave signal is modulated, front and back enters the discrete chirped fiber grating delay unit being made of uniform fiber grating and linear chirp optical fiber grating twice, two-stage delay is completed, final output has the four road electric signals for waiting delay inequalities；Meanwhile the output wavelength of simultaneous tuning tunable laser and tunable linear optical fiber grating, the variation of delay inequality may be implemented.The present invention may be implemented the equal delay inequalities output of four road signals with it is fine-tuning, real-time is good, although introducing error source all the way, this error source can be ignored by passing through dexterously combination linear chirped fiber grating, system, meanwhile, simplify experimental provision, reduce costs.
Description
Technical field
The invention belongs to technical field of optical fiber sensing, and in particular to the tunable true delay based on discrete chirped fiber grating
Experimental provision and method.
Background technique
In Fibre Optical Communication Technology, fiber grating is the nova to emerge in recent years, it is considered to be is put after erbium-doped fiber
Another important breakthrough after big device, plays important impetus to the development of Fibre Optical Communication Technology.And in phased array field,
No deflection can be provided for advanced capabilities radar system using fiber grating as the fibre delay line of core, the real-time of wide instant bandwidth prolongs
Slow wave beam control.Its is light-weight, small in size, and not vulnerable to the interference of electromagnetic radiation, the extremely low advantage of electrical noise is very suitable to airborne
Or spaceborne application.
Domestic and foreign scholars are concentrated mainly on through additional tuning the research of fiber grating, change its reflection characteristic, specifically
Including refractive index, reflection spectrum width, chirp coefficient and reflectance spectrum translational movement.Change transmission indirectly by the tuning to fiber grating
The retardation of different interchannels in system, to realize the control for being directed toward angle to the signal of optical delay system.Tuning means are wrapped again
Include thermal tuning, stress tuning, magnetic force tuning etc..It establishes and perfect using fiber grating as the fibre delay line system of core, at
For the hot spot paid close attention at present.
Nanyang Technolohy University Pham Q. Thai is in " Simplified Optical Dual Beamformer
Employing Multichannel Chirped Fiber Grating and Tunable Optical Delay Lines》
It is middle to propose a kind of tunable delayed time system based on linear chirp optical fiber grating.By tuning laser output wavelength and tunable
Delay device realizes two-stage delay, the signal of the delay inequalities such as tetra- tunnel final output Liang Zu.However the system introduces multiple path errors,
And tuning precision is low.
Summary of the invention
The purpose of the present invention is to provide tunable true delay experimental provision and method based on discrete chirped fiber grating,
May be implemented the equal delay inequalities output of four road signals with it is fine-tuning, real-time is good, although introducing error source all the way, passes through ingenious
Ground combination linear chirped fiber grating can ignore this error source, meanwhile, experimental provision is simplified, is reduced costs.
The technical solution for realizing the aim of the invention is as follows: a kind of tunable true delay based on discrete chirped fiber grating
Experimental provision, including tunable laser, laser with fixed wavelength, the first wavelength division multiplexer, the second wavelength division multiplexer, third wave
Division multiplexer, signal generator, electrooptic modulator, the first delay line, the second delay line, third delay line,
Optical splitter, four photodetectors.
The output end of tunable laser and laser with fixed wavelength connects two wavelength-division ports of the first wavelength division multiplexer respectively,
The multiplexing port of first wavelength division multiplexer connects electrooptic modulator, and signal generator connects the signal input part of electrooptic modulator, electric light
The output of modulator terminates the first delay line, and the first delay line accesses optical splitter, the two output ends difference of optical splitter
Connecing the second delay line and third delay line, the second delay line connects the input terminal of the second wavelength division multiplexer, and second
Two output ends of wavelength division multiplexer connect two photodetectors respectively, and third delay line connects the defeated of third wavelength division multiplexer
Enter end, two output ends of third wavelength division multiplexer connect two photodetectors respectively.
First delay line includes the first optical circulator, the first uniform fiber grating and the first linearly chirped fiber
Grating, 1 port of output the first optical circulator of termination of electrooptic modulator, 2 ports of the first optical circulator are sequentially connected in series first
Uniform fiber grating and the first linear chirp optical fiber grating, 3 ports of the first optical circulator connect the input terminal of optical splitter.
Second delay line includes the second optical circulator, the second uniform fiber grating and the second linearly chirped fiber
Grating, 1 port of output the second optical circulator of termination of optical splitter, 2 ports of the second optical circulator are sequentially connected in series second uniformly
Fiber grating and the second linear chirp optical fiber grating, 3 ports of the second optical circulator connect the input terminal of the second wavelength division multiplexer.
The third delay line includes third optical circulator, third linear chirped fiber grating and the 4th linear chrip
Fiber grating, 1 port of the output termination third optical circulator of optical splitter, 2 ports of third optical circulator are sequentially connected in series third
3 ports of linear chirp optical fiber grating and the 4th linear chirp optical fiber grating, third optical circulator connect third wavelength division multiplexer
Input terminal.
A method of the tunable true delay experimental provision based on discrete chirped fiber grating, method and step are as follows:
Step 1, by it is above-mentioned based on discrete chirped fiber grating it is tunable it is true delay experimental provision four photodetections
Device parallel connection accesses oscillograph, is transferred to step 2；
Step 2 opens tunable laser and laser with fixed wavelength, and the light wave of tunable laser output is through first wave
Enter electrooptic modulator behind the matching wavelength-division channel of division multiplexer, synchronous signal generator issues microwave signal, and load exists
On light wave, modulated optical signal enters the first optical circulator, reflects at the first linear chirp optical fiber grating, for the first time
Optical signal after reflection is divided into two paths of signals through optical splitter, and signal enters the second optical circulator all the way, in the second linear chrip light
After being reflected at fine grating, photodetector is sequentially entered behind the matching wavelength-division channel of the second wavelength division multiplexer, is shown
Wave device；Another way optical signal enters third optical circulator, in third linear chirped fiber grating) at reflect, by third
Behind the matching wavelength-division channel of wavelength division multiplexer, photoelectric detector, oscilloscope is sequentially entered；
The wavelength of laser with fixed wavelength output enters electric light behind the matching wavelength-division channel of the first wavelength division multiplexer
Modulator is interfered with the microwave signal for carrying out automatic signal generator input, and the optical signal after being brought to passes through the first ring of light row
It being reflected at the first uniform fiber grating after device, the optical signal after being reflected is divided into two paths of signals after optical splitter, and one
Road is reflected at the second uniform fiber grating after the second optical circulator, and the optical signal after being reflected is answered through the second wavelength-division
With sequentially entering photoelectric detector, oscilloscope behind the matching wavelength-division channel of device；Another way optical signal passes through third ring of light row
It is reflected at the 4th linear chirp optical fiber grating after device, the optical signal after being reflected is matching through third wavelength division multiplexer
Wavelength-division channel after sequentially enter photoelectric detector, oscilloscope；
The delay inequality that four road signals are shown on oscillograph at this time is observed and recorded, step 3 is transferred to；
Step 3, the wavelength of simultaneous tuning tunable laser and the 4th linear chirp optical fiber grating, observe and record at this time
The delay inequality that four road signals are shown on oscillograph, is transferred to step 4；
Step 4 repeats step 3, the wavelength and the 4th of Xiang Changbo or shortwave direction simultaneous tuning Wavelength tunable laser
Linear chirp optical fiber grating observes and records under corresponding wavelength at this time, the delay inequality that four road signals are shown on oscillograph；Directly
To the reflection spectral limit for exceeding the second linear chirp optical fiber grating, it is transferred to step 5；
Step 5 is drawn under same microwave signal, and the delay inequality of four tunnel output signal of system is with tunable laser output wave
Long variation diagram analyzes the tuning precision and tuning range of this tunable true delayed time system.
Compared with prior art, the present invention its remarkable advantage is:
(1) by cleverly combining chirped fiber grating, system can be ignored where tunable linear chirp optical fiber grating
The real time delay error in channel, to eliminate the delay inequality compensating unit of system.
(2) realize the equal delay inequalities output of four road signals with it is fine-tuning, real-time is good, tuning precision height.
(3) experimental provision is simplified, is reduced costs.
Detailed description of the invention
Fig. 1 is that the present invention is based on the tunable true delay experimental provision structure charts of discrete chirped fiber grating.
Fig. 2 is that the present invention is based on the tunable true delay experimental provisions of discrete chirped fiber grating to test structure chart.
True delay schematic diagram when Fig. 3 is the output wavelength of untuned tunable laser of the present invention.
Fig. 4 is the output wavelength of simultaneous tuning tunable laser of the present invention and when tunable linear chirp optical fiber grating
True delay schematic diagram.
Specific embodiment
Present invention is further described in detail with reference to the accompanying drawing.
In conjunction with Fig. 1, a kind of tunable true delay experimental provision based on discrete chirped fiber grating, including tunable laser
Device 1, laser with fixed wavelength 2, the first wavelength division multiplexer 3-1, the second wavelength division multiplexer 3-2, third wavelength division multiplexer 3-3, letter
Number generator 4, electrooptic modulator 5, the first delay line, the second delay line, third delay line, optical splitter 9, four
A photodetector 10.
The output end of tunable laser 1 and laser with fixed wavelength 2 connects two wavelength-divisions of the first wavelength division multiplexer 3-1 respectively
Port, the multiplexing port of the first wavelength division multiplexer 3-1 connect electrooptic modulator 5, and signal generator 4 connects the signal of electrooptic modulator 5
Input terminal, the output of electrooptic modulator 5 terminate the first delay line, and the first delay line accesses optical splitter 9, optical splitter 9
Two output ends connect the second delay line and third delay line respectively, the second delay line connects the second wavelength division multiplexer
The input terminal of 3-2, two output ends of the second wavelength division multiplexer 3-2 connect two photodetectors 10, third delay line list respectively
Member connects the input terminal of third wavelength division multiplexer 3-3, and two output ends of third wavelength division multiplexer 3-3 connect two photodetections respectively
Device 10.
First delay line includes the first optical circulator 6-1, the first uniform fiber grating 7-1 and the first linear Zhou
It sings fiber grating 8-1,1 port of the first optical circulator 6-1 of output termination of electrooptic modulator 5, the 2 of the first optical circulator 6-1
Port is sequentially connected in series the first uniform fiber grating 7-1 and the first linear chirp optical fiber grating 8-1,3 ends of the first optical circulator 6-1
Mouth connects the input terminal of optical splitter 9；
Second delay line includes the second optical circulator 6-2, the second uniform fiber grating 7-2 and the second linear Zhou
It sings fiber grating 8-2,1 port of the second optical circulator 6-2 of output termination of optical splitter 9,2 ports of the second optical circulator 6-2
It is sequentially connected in series the second uniform fiber grating 7-2 and the second linear chirp optical fiber grating 8-2,3 ports of the second optical circulator 6-2 connect
The input terminal of second wavelength division multiplexer 3-2.
The third delay line includes third optical circulator 6-3, third linear chirped fiber grating 8-3 and the 4th line
Property chirped fiber grating 8-4, optical splitter 9 output termination third optical circulator 6-3 1 port, the 2 of third optical circulator 6-3
Port is sequentially connected in series third linear chirped fiber grating 8-3 and the 4th linear chirp optical fiber grating 8-4, third optical circulator 6-3
3 ports connect the input terminal of third wavelength division multiplexer 3-3.
The optical splitter 9 uses 1 × 2 optical splitter.
In conjunction with Fig. 2, a method of the tunable true delay experimental provision based on discrete chirped fiber grating, method and step
It is as follows:
Step 1, by it is above-mentioned based on discrete chirped fiber grating it is tunable it is true delay experimental provision four photodetections
The access oscillograph 11 in parallel of device 10, is transferred to step 2.
Step 2 opens tunable laser 1 and laser with fixed wavelength 2, and the light wave that tunable laser 1 exports is through the
Enter electrooptic modulator 5 behind one wavelength division multiplexer 3-1 matching wavelength-division channel, synchronous signal generator 4 issues microwave letter
Number, it loads on light wave, modulated optical signal enters the first optical circulator 6-1, at the first linear chirp optical fiber grating 8-1
It reflects, the optical signal after first reflection divides through optical splitter 9 for two paths of signals, and signal enters the second optical circulator 6- all the way
2, after being reflected at the second linear chirp optical fiber grating 8-2, through the matching wavelength-division channel the second wavelength division multiplexer 3-2
After sequentially enter photodetector 10, oscillograph 11；Another way optical signal enters third optical circulator 6-3, in third linear Zhou
It sings and reflects at fiber grating 8-3, behind third wavelength division multiplexer 3-3 matching wavelength-division channel, sequentially enter light
Electric explorer 10, oscillograph 11.
The wavelength that laser with fixed wavelength 2 exports enters behind the matching wavelength-division channel the first wavelength division multiplexer 3-1
Electrooptic modulator 5 is interfered with the microwave signal for carrying out the input of automatic signal generator 4, and the optical signal after being brought to passes through first
It is reflected at the first uniform fiber grating 7-1 after optical circulator 6-1, the optical signal after being reflected is divided after optical splitter 9
For two paths of signals, reflected at the second uniform fiber grating 7-2 after the second optical circulator 6-2 all the way, after reflecting
Optical signal sequentially enter photodetector 10, oscillograph 11 behind the matching wavelength-division channel the second wavelength division multiplexer 3-2；
Another way optical signal reflects at the 4th linear chirp optical fiber grating 8-4 after third optical circulator 6-3, after reflecting
Optical signal sequentially enter photodetector 10, oscillograph 11 behind the matching wavelength-division channel third wavelength division multiplexer 3-3.
The delay inequality that four road signals are shown on oscillograph 11 at this time is observed and recorded, step 3 is transferred to.
Step 3, the wavelength of simultaneous tuning tunable laser 1 and the 4th linear chirp optical fiber grating 8-4, observe and record
The delay inequality that four road signals are shown on oscillograph 11 at this time, is transferred to step 4；
Step 4 repeats step 3, the wavelength and the 4th of Xiang Changbo or shortwave direction simultaneous tuning Wavelength tunable laser 1
Linear chirp optical fiber grating 8-4 is observed and recorded under corresponding wavelength at this time, the delay that four road signals are shown on oscillograph 11
Difference；Until exceeding the reflection spectral limit of the second linear chirp optical fiber grating 8-2, it is transferred to step 5.
Step 5 is drawn under same microwave signal, and the delay inequality of four tunnel output signal of system is exported with tunable laser 1
The variation diagram of wavelength analyzes the tuning precision and tuning range of this tunable true delayed time system.
The optical splitter 9 uses 1 × 2 optical splitter.
The wavelength of the laser with fixed wavelength 2 is outside the wave-length coverage of Wavelength tunable laser 1.
First wavelength division multiplexer 3-1, the second wavelength division multiplexer 3-2 are identical with third wavelength division multiplexer 3-3, Mei Gebo
The wave-length coverage in two wavelength-division channels covers the wavelength of respective laser output in division multiplexer, and wave-length coverage is not handed over
It is folded.
Two output ends of optical splitter 9 are isometric.
The wavelength-division end of the second wavelength division multiplexer 3-2 and third wavelength division multiplexer 3-3 are isometric.
The output frequency of the signal generator 4 and the modulating frequency of electrooptic modulator 5, the detection frequency of photodetector 10
Rate, the matching of the working frequency of oscillograph 11.
The first uniform fiber grating 7-1, the reflection wavelength of the second uniform fiber grating 7-2, the 4th linear chrip light
The center reflection wavelength of fine grating 8-4 is identical as the wavelength of laser with fixed wavelength 2.
First linear chirp optical fiber grating 8-1, the second linear chirp optical fiber grating 8-2, third linear chirped fiber grating
8-3 is identical as the central wavelength of Wavelength tunable laser 1.
Three optical circulators are identical；Four photodetectors 10 are identical.
The chirp coefficient of the first linear chirp optical fiber grating 8-1 is the 1/2 of the second linear chirp optical fiber grating 8-2,
It is 15 times of third linear chirped fiber grating 8-3, is the 1/2 of the 4th linear chirp optical fiber grating 8-4；To ignore tuned
The influence of the delay error generated in journey, the chirp coefficient of third linear chirped fiber grating 8-3 is than remaining linear chrip light
The small at least an order of magnitude of the chirp coefficient of fine grating.
The central wavelength of first center uniform fiber grating 7-1 and the first linear chirp optical fiber grating 8-1 reflect position
Setting distance is 2L, the central wavelength reflection of the second center uniform fiber grating 7-2 and the second linear chirp optical fiber grating 8-2
Positional distance is the central wavelength reflection position of L, third linear chirped fiber grating 8-3 and the 4th linear chirp optical fiber grating 8-4
Setting distance is L, and the magnitude range of L is 10 ~ 20mm.
Embodiment 1
Experiment tests the laser 2 of a fixed wave length, output wavelength 1542.9nm；A tunable laser 1,
Central wavelength is 1550.9nm, and tuning range is；First wavelength division multiplexer 3-1, the second wavelength division multiplexer 3-2 and
Three wavelength division multiplexer 3-3 are all the same, and the wave-length coverage in two-way wavelength-division channel is respectively as follows:、；
The reflection wavelength of first uniform fiber grating 7-1 is 1542.9nm, grating length 6mm, the first linear chirp optical fiber grating 8-1
Center reflection wavelength be 1550.9nm, chirp coefficient 3nm/cm, grating length 12mm, two fiber grating head and the tail spacing are
11mm；The reflection wavelength of second uniform fiber grating 7-2 is 1542.9nm, grating length 6mm, the second linearly chirped fiber light
The center reflection wavelength of grid 8-2 is 1550.9nm, chirp coefficient 6nm/cm, grating length 6mm, between two fiber grating head and the tail
Away from for 4mm；The center reflection wavelength of third linear chirped fiber grating 8-3 is 1550.9nm, chirp coefficient 0.2nm/cm, light
Gate length is 6mm, and the center reflection wavelength of the 4th linear chirp optical fiber grating 8-4 is 1550.9nm, chirp coefficient 6nm/cm,
Grating length is 6mm, and two fiber grating head and the tail spacing are 4mm；The internal optical fiber length of four photodetectors 10 is 40mm；
Rest part has isometric requirement, and light path is 1000mm；The output frequency of signal generator 4 is 3GHz, electrooptic modulator 5
Working frequency is not more than 12GHz, and the look-in frequency of photodetector 10 is not more than 12GHz, and the working frequency of oscillograph 12 is 0 ~
4GHz；Its test device is as shown in Fig. 2, a kind of side of the tunable true delay experimental provision based on discrete chirped fiber grating
Method, method and step are as follows:
Step 1, by it is above-mentioned based on discrete chirped fiber grating it is tunable it is true delay experimental provision four photodetections
The access oscillograph 11 in parallel of device 10, is transferred to step 2.
Step 2 opens tunable laser 1 and laser with fixed wavelength 2, and the light wave that tunable laser 1 exports is through the
Enter electrooptic modulator 5 behind one wavelength division multiplexer 3-1 matching wavelength-division channel, synchronous signal generator 4 issues microwave letter
Number, it loads on light wave, modulated optical signal enters the first optical circulator 6-1, at the first linear chirp optical fiber grating 8-1
It reflects, the optical signal after first reflection divides through optical splitter 9 for two paths of signals, and signal enters the second optical circulator 6- all the way
2, after being reflected at the second linear chirp optical fiber grating 8-2, through the matching wavelength-division channel the second wavelength division multiplexer 3-2
After sequentially enter photodetector 10, oscillograph 11；Another way optical signal enters third optical circulator 6-3, in third linear Zhou
It sings and reflects at fiber grating 8-3, behind third wavelength division multiplexer 3-3 matching wavelength-division channel, sequentially enter light
Electric explorer 10, oscillograph 11.
The wavelength that laser with fixed wavelength 2 exports enters behind the matching wavelength-division channel the first wavelength division multiplexer 3-1
Electrooptic modulator 5 is interfered with the microwave signal for carrying out the input of automatic signal generator 4, and the optical signal after being brought to passes through first
It is reflected at the first uniform fiber grating 7-1 after optical circulator 6-1, the optical signal after being reflected is divided after optical splitter 9
For two paths of signals, reflected at the second uniform fiber grating 7-2 after the second optical circulator 6-2 all the way, after reflecting
Optical signal sequentially enter photodetector 10, oscillograph 11 behind the matching wavelength-division channel the second wavelength division multiplexer 3-2；
Another way optical signal reflects at the 4th linear chirp optical fiber grating 8-4 after third optical circulator 6-3, after reflecting
Optical signal sequentially enter photodetector 10, oscillograph 11 behind the matching wavelength-division channel third wavelength division multiplexer 3-3.
The delay inequality that four road signals are shown on oscillograph 11 at this time is observed and recorded, step 3 is transferred to.
Step 3, the wavelength of simultaneous tuning tunable laser 1 and the 4th linear chirp optical fiber grating 8-4, observe and record
The delay inequality that four road signals are shown on oscillograph 11 at this time, is transferred to step 4；
Step 4 repeats step 3, the wavelength and the 4th of Xiang Changbo or shortwave direction simultaneous tuning Wavelength tunable laser 1
Linear chirp optical fiber grating 8-4 is observed and recorded under corresponding wavelength at this time, the delay that four road signals are shown on oscillograph 11
Difference；Until exceeding the reflection spectral limit of the second linear chirp optical fiber grating 8-2, it is transferred to step 5.
Step 5 is drawn under same microwave signal, and the delay inequality of four tunnel output signal of system is exported with tunable laser 1
The variation diagram of wavelength analyzes the tuning precision and tuning range of this tunable true delayed time system.
In conjunction with Fig. 1 ~ Fig. 4, the implementation case exports the four road signals that delay inequality is 100ps under initial wavelength；In this base
On plinth, the wavelength of simultaneous tuning tunable laser 1 and the 4th linear chirp optical fiber grating 8-4, the delay inequality of output signal is same
Step changes.The present invention may be implemented the equal delay inequalities output of four road signals with it is fine-tuning, real-time is good, although introducing is all the way
Error source, but this error source can be ignored by dexterously combination linear chirped fiber grating, system, meanwhile, simplify experiment
Device reduces costs.
Claims (8)
1. a kind of tunable true delay experimental provision based on discrete chirped fiber grating, it is characterised in that: swash including tunable
Light device (1), laser with fixed wavelength (2), the first wavelength division multiplexer (3-1), the second wavelength division multiplexer (3-2), third wavelength-division are multiple
With device (3-3), signal generator (4), electrooptic modulator (5), the first delay line, the second delay line, third delay
Line unit, optical splitter (9), four photodetectors (10)；
The output end of tunable laser (1) and laser with fixed wavelength (2) connects two waves of the first wavelength division multiplexer (3-1) respectively
Divide port, the multiplexing port of the first wavelength division multiplexer (3-1) connects electrooptic modulator (5), and signal generator (4) connects electrooptic modulator
(5) signal input part, the output of electrooptic modulator (5) terminate the first delay line, the access light splitting of the first delay line
Device (9), two output ends of optical splitter (9) connect the second delay line and third delay line, the second delay line respectively
The input terminal of the second wavelength division multiplexer (3-2) is connect, two output ends of the second wavelength division multiplexer (3-2) connect two photoelectricity respectively and visit
It surveys device (10), third delay line connects the input terminal of third wavelength division multiplexer (3-3), and the two of third wavelength division multiplexer (3-3)
A output end connects two photodetectors (10) respectively；
First delay line includes the first optical circulator (6-1), the first uniform fiber grating (7-1) and the first linear Zhou
It sings fiber grating (8-1), 1 port of the output termination the first optical circulator (6-1) of electrooptic modulator (5), the first optical circulator
2 ports of (6-1) are sequentially connected in series the first uniform fiber grating (7-1) and the first linear chirp optical fiber grating (8-1), first ring of light
3 ports of row device (6-1) connect the input terminal of optical splitter (9)；
Second delay line includes the second optical circulator (6-2), the second uniform fiber grating (7-2) and the second linear Zhou
It sings fiber grating (8-2), 1 port of the output termination the second optical circulator (6-2) of optical splitter (9), the second optical circulator (6-2)
2 ports be sequentially connected in series the second uniform fiber grating (7-2) and the second linear chirp optical fiber grating (8-2), the second optical circulator
3 ports of (6-2) connect the input terminal of the second wavelength division multiplexer (3-2)；
The third delay line includes third optical circulator (6-3), third linear chirped fiber grating (8-3) and the 4th
Linear chirp optical fiber grating (8-4), 1 port of output termination third optical circulator (6-3) of optical splitter (9), third ring of light row
2 ports of device (6-3) are sequentially connected in series third linear chirped fiber grating (8-3) and the 4th linear chirp optical fiber grating (8-4),
3 ports of third optical circulator (6-3) connect the input terminal of third wavelength division multiplexer (3-3).
2. the tunable true delay experimental provision according to claim 1 based on discrete chirped fiber grating, feature exist
In: the optical splitter (9) uses 1 × 2 optical splitter.
3. a kind of side of the tunable true delay experimental provision based on described in claim 1 based on discrete chirped fiber grating
Method, which is characterized in that method and step is as follows:
Step 1, by it is above-mentioned based on discrete chirped fiber grating it is tunable it is true delay experimental provision four photodetectors
(10) access oscillograph (11) in parallel, is transferred to step 2；
Step 2 opens tunable laser (1) and laser with fixed wavelength (2), the light wave warp of tunable laser (1) output
Enter electrooptic modulator (5) behind the matching wavelength-division channel of first wavelength division multiplexer (3-1), synchronous signal generator (4) hair
Microwave signal out loads on light wave, and modulated optical signal enters the first optical circulator (6-1), in the first linear chirped light
Reflected at fine grating (8-1), the optical signal after first reflection is divided into two paths of signals through optical splitter (9), all the way signal into
Enter the second optical circulator (6-2), after reflecting at the second linear chirp optical fiber grating (8-2), through the second wavelength division multiplexer
Photodetector (10), oscillograph (11) are sequentially entered behind (3-2) matching wavelength-division channel；Another way optical signal enters the
Three optical circulators (6-3) reflect at third linear chirped fiber grating (8-3), by third wavelength division multiplexer (3-3)
Behind matching wavelength-division channel, photodetector (10), oscillograph (11) are sequentially entered；
The wavelength of laser with fixed wavelength (2) output enters behind the matching wavelength-division channel of the first wavelength division multiplexer (3-1)
Electrooptic modulator (5) is interfered with the microwave signal for carrying out automatic signal generator (4) input, and the optical signal after being brought to passes through
It is reflected at the first uniform fiber grating (7-1) after first optical circulator (6-1), the optical signal after being reflected is through optical splitter
(9) it is divided into two paths of signals after, occurs at the second uniform fiber grating (7-2) after the second optical circulator (6-2) all the way
Reflection, the optical signal after being reflected sequentially enter photoelectricity spy behind the matching wavelength-division channel of the second wavelength division multiplexer (3-2)
Survey device (10), oscillograph (11)；Another way optical signal is after third optical circulator (6-3) in the 4th linear chirp optical fiber grating
Reflected at (8-4), the optical signal after being reflected behind the matching wavelength-division channel of third wavelength division multiplexer (3-3) successively
Into photodetector (10), oscillograph (11)；
The delay inequality that four road signals are shown on oscillograph (11) at this time is observed and recorded, step 3 is transferred to；
Step 3, the wavelength of simultaneous tuning tunable laser (1) and the 4th linear chirp optical fiber grating (8-4), observe and record
The delay inequality that four road signals are shown on oscillograph (11) at this time, is transferred to step 4；
Step 4 repeats step 3, the wavelength and the 4th line of Xiang Changbo or shortwave direction simultaneous tuning Wavelength tunable laser (1)
Property chirped fiber grating (8-4), observes and records under corresponding wavelength at this time, what four road signals were shown on oscillograph (11) prolongs
The time difference；Until exceeding the reflection spectral limit of the second linear chirp optical fiber grating (8-2), it is transferred to step 5；
Step 5 is drawn under same microwave signal, and the delay inequality of four tunnel output signal of system is with tunable laser (1) output wave
Long variation diagram analyzes the tuning precision and tuning range of this tunable true delayed time system.
4. the method for the tunable true delay experimental provision according to claim 3 based on discrete chirped fiber grating,
Be characterized in that: the wavelength of the laser with fixed wavelength (2) is outside the wave-length coverage of Wavelength tunable laser (1)；
First wavelength division multiplexer (3-1), the second wavelength division multiplexer (3-2) are identical with third wavelength division multiplexer (3-3), each
The wave-length coverage in two wavelength-division channels covers the wavelength of respective laser output in wavelength division multiplexer, and wave-length coverage is not handed over
It is folded；
Two output ends of optical splitter (9) are isometric.
5. the method for the tunable true delay experimental provision according to claim 3 based on discrete chirped fiber grating,
Be characterized in that: the wavelength-division end of second wavelength division multiplexer (3-2) and third wavelength division multiplexer (3-3) is isometric.
6. the method for the tunable true delay experimental provision according to claim 3 based on discrete chirped fiber grating,
It is characterized in that: the output frequency of the signal generator (4) and modulating frequency, the photodetector (10) of electrooptic modulator (5)
Look-in frequency, oscillograph (11) working frequency matching.
7. the method for the tunable true delay experimental provision according to claim 3 based on discrete chirped fiber grating,
It is characterized in that: first uniform fiber grating (7-1), the reflection wavelength of the second uniform fiber grating (7-2), the 4th linear Zhou
Sing fiber grating (8-4) center reflection wavelength it is identical as the wavelength of laser with fixed wavelength (2)；
First linear chirp optical fiber grating (8-1), the second linear chirp optical fiber grating (8-2), third linear chirped fiber grating
(8-3) is identical as the central wavelength of Wavelength tunable laser (1)；
Three optical circulators are identical；Four photodetectors (10) are identical.
8. the method for the tunable true delay experimental provision according to claim 7 based on discrete chirped fiber grating,
Be characterized in that: the chirp coefficient of first linear chirp optical fiber grating (8-1) is the second linear chirp optical fiber grating (8-2)
1/2, it is 15 times of third linear chirped fiber grating (8-3), is the 1/2 of the 4th linear chirp optical fiber grating (8-4)；To ignore
The influence of the delay error generated during tuning, the chirp coefficient of third linear chirped fiber grating (8-3) is than remaining
The small at least an order of magnitude of the chirp coefficient of linear chirp optical fiber grating；
The central wavelength of the first uniform fiber grating center (7-1) and the first linear chirp optical fiber grating (8-1) reflect position
Setting distance is 2L, the central wavelength of the second uniform fiber grating center (7-2) and the second linear chirp optical fiber grating (8-2)
Reflection position distance is L, the middle cardiac wave of third linear chirped fiber grating (8-3) and the 4th linear chirp optical fiber grating (8-4)
Long reflection position distance is L, and the magnitude range of L is 10 ~ 20mm.
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