CN106646425B - Tunable true delay experimental provision and its experimental method based on wavelength-division multiplex - Google Patents
Tunable true delay experimental provision and its experimental method based on wavelength-division multiplex Download PDFInfo
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- CN106646425B CN106646425B CN201611139553.0A CN201611139553A CN106646425B CN 106646425 B CN106646425 B CN 106646425B CN 201611139553 A CN201611139553 A CN 201611139553A CN 106646425 B CN106646425 B CN 106646425B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/481—Constructional features, e.g. arrangements of optical elements
- G01S7/4818—Constructional features, e.g. arrangements of optical elements using optical fibres
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/483—Details of pulse systems
- G01S7/486—Receivers
- G01S7/4865—Time delay measurement, e.g. time-of-flight measurement, time of arrival measurement or determining the exact position of a peak
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/491—Details of non-pulse systems
- G01S7/4912—Receivers
- G01S7/4915—Time delay measurement, e.g. operational details for pixel components; Phase measurement
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Abstract
The invention discloses a kind of tunable true delay experimental provision and its experimental method based on wavelength-division multiplex, first, it builds the experimental provision of the tunable true delayed time system based on wavelength-division multiplex: building two groups by uniform fiber grating and the concatenated delay line of chirped fiber grating and one group by two concatenated delay lines of chirped fiber grating, 2 ports of three optical circulators are respectively connected to, this three groups of delay lines are respectively connected to 1Three arms of 2 optical splitters realize two-stage delay, while delay compensation module are added in wherein one delay channel, finally access remaining delay device；Secondly, the wavelength of simultaneous tuning Wavelength tunable laser and wherein chirped fiber grating at one, realize the real-time tuning of true delayed time system.The present invention realizes the independent tuning to signal delay time a certain in multiplexed signals, reduces error source, and tuning precision is high, and tuning range is big, meanwhile, structure is simple, and manufacture difficulty is low.
Description
Technical field
The invention belongs to technical field of optical fiber communication, and in particular to a kind of tunable true delay experiment based on wavelength-division multiplex
Device and its experimental method.
Background technique
Radar as the key technology defended and struck back in military strategy, constantly expand by intension and research contents.It is light-operated
Phased array technology shows good performance under the operating conditions such as strong clutter, strong jamming and hard strike, has very big
Technology Potential, therefore its development and research receive most attention both domestic and external.
Phased-array radar using fibre delay line as delay device is exactly Optically controlled microwave thunder.Its core is light-operated phased
Array antenna is arranged by many radiating elements.Existing tunable true delayed time system mainly includes to laser output wavelength
Tuning, to tuning, switching of photoswitch of fiber grating etc..In the design of specific system, limited by cost, space ruler
Very little constraint, the various problems such as the interference of electromagnetic field, tuning range is small, tuning precision is low.Therefore, domestic and foreign scholars have been devoted to
Design and improvement to tunable true delayed time system.
2008, Nanyang Technolohy University Pham Q. Thai et al. was in " Simplified Optical Dual
Beamformer Employing Multichannel Chirped Fiber Grating and Tunable Optical
Delay Lines " in propose a kind of tunable delayed time system based on linear chirp optical fiber grating.The system includes 2 unicasts
Long laser, 2 tunable narrow-linewidth single wavelength lasers,、It is one group,、It is one group.First group of two-beam quilt
After microwave signal modulation, two different delays are obtained in multichannel chirp grating, the delay inequality of two-beam is.By
It crosses optical splitter and enters different channels, in first wavelength-division channel, be directly over solution wavelength division multiplexer, photodetector demodulates
Come；In second wavelength-division channel, attached a delay time isAdjustable time delay.By laser、Export four groups
Electric signal, the delay inequality between array element are.Similarly, by laser、Four groups of electric signals of output, the delay inequality between array element are.The system tunning adjustable time delay introduces multiple path errors, while needing to tune multiple devices, operates more complicated.
Summary of the invention
The tunable true delay experimental provision and its experiment side that the purpose of the present invention is to provide a kind of based on wavelength-division multiplex
Method is realized by the output wavelength of simultaneous tuning linear chirp optical fiber grating and laser to the real-time of system signal delay inequality
Tuning and control.The present invention can individually tune signal delay time a certain in multiplexed signals, and error source is reduced, and adjust
Humorous precision is high, and tuning range is big, meanwhile, structure is simple, and manufacture difficulty is low.
The technical solution for realizing the aim of the invention is as follows: a kind of tunable true delay experiment dress based on wavelength-division multiplex
It sets, including Wavelength tunable laser, laser with fixed wavelength, the first wavelength division multiplexer, the second wavelength division multiplexer, third wavelength-division
Multiplexer, signal generator, electrooptic modulator, the first delay line, the second delay line, third delay line,
Four delay lines, optical splitter, four photodetectors.
Wavelength tunable laser and laser with fixed wavelength are respectively connected to two wavelength-division ports of the first wavelength division multiplexer, the
The multiplexing port of one wavelength division multiplexer connects the light input end of electrooptic modulator, and the signal that signal generator accesses electrooptic modulator is defeated
Enter end, the output of electrooptic modulator terminates the first delay line, and the first delay line connects the input terminal of optical splitter, optical splitter
Output end connect the second delay line and third delay line respectively, the second delay line connects the second wavelength division multiplexer
Input terminal, the second wavelength division multiplexer output end connect two photodetectors respectively, and third delay line connects third wavelength-division multiplex
The input terminal of device, the output end of third wavelength division multiplexer connect third photodetector all the way, and another way successively connects the 4th delay
Line unit and the 4th photodetector.
A kind of experimental method of the tunable true delay experimental provision based on wavelength-division multiplex, method and step are as follows:
Step 1, by it is above-mentioned based on wavelength-division multiplex it is tunable it is true delay experimental provision four photodetectors and couple
Enter oscillograph, is transferred to step 2；
Step 2 opens Wavelength tunable laser and laser with fixed wavelength, the wavelength warp of laser with fixed wavelength output
Enter electrooptic modulator behind the matching wavelength-division channel of first wavelength division multiplexer, believes with the microwave for carrying out automatic signal generator input
It number interferes, the optical signal after being brought to occurs at the first uniform fiber grating (7-1) anti-after the first optical circulator
It penetrates, the optical signal after being reflected is divided into two paths of signals after optical splitter, uniform second after the second optical circulator all the way
It is reflected at fiber grating, the optical signal after being reflected enters light behind the matching wavelength-division channel of the second wavelength division multiplexer
Electric explorer is finally shown on oscillograph；And another way optical signal after third optical circulator in the 4th linear chrip light
It is reflected at fine grating, the optical signal after being reflected enters photoelectricity behind the matching wavelength-division channel of third wavelength division multiplexer
Detector is finally shown on oscillograph；
The wavelength of Wavelength tunable laser output simultaneously is laggard through the matching wavelength-division channel of the first wavelength division multiplexer
Enter electrooptic modulator, is interfered with the microwave signal for carrying out automatic signal generator input, the optical signal after being brought to passes through first
It is reflected at the first linear chirp optical fiber grating after optical circulator, the optical signal after being reflected equally is divided after optical splitter
For two paths of signals, reflected at the second linear chirp optical fiber grating after the second optical circulator all the way, after reflecting
Optical signal enters photodetector behind the matching wavelength-division channel of the second wavelength division multiplexer, is finally shown on oscillograph；
And another way optical signal reflects at third linear chirped fiber grating after third optical circulator, the light after being reflected
Signal enters the 4th optical circulator behind the matching wavelength-division channel of third wavelength division multiplexer, in the 5th linearly chirped fiber light
Enter photodetector after compensatory reflex occurs at grid, is finally shown on oscillograph；
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 Wavelength tunable laser and the 4th linear chirp optical fiber grating, observe and record
The delay inequality that four road signals are shown on oscillograph 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
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, draw four road signals delay inequality with Wavelength tunable laser wavelength change Dynamic Graph, analyze base
In the tuning precision and tuning range of the tunable true delay experimental provision of wavelength-division multiplex.
Compared with prior art, the present invention its remarkable advantage is:
(1) reduce error source, improve tuning precision, expand tuning range.
(2) the independent tuning to signal delay time a certain in multiplexed signals is realized.
(3) device is simple, and manufacture difficulty is low, save the cost.
Detailed description of the invention
Fig. 1 is that the present invention is based on the tunable true delay experimental provision structure charts of wavelength-division multiplex.
Fig. 2 is the test structure chart of the tunable true delay experimental provision the present invention is based on wavelength-division multiplex.
Fig. 3 is the output wavelength of untuned Wavelength tunable laser of the present invention and when tunable linear chirp optical fiber grating
True delay schematic diagram.
Output wavelength and tunable linear chirp optical fiber grating of the Fig. 4 for simultaneous tuning Wavelength tunable laser of the present invention
When true delay schematic diagram.
Specific embodiment
Present invention is further described in detail with reference to the accompanying drawing.
A kind of tunable true delay experimental provision based on wavelength-division multiplex combined with Figure 1 and Figure 2, including tunable wave length swash
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 multiplexer 3-3,
Signal generator 4, electrooptic modulator 5, the first delay line, the second delay line, third delay line, the 4th delay
9, four line unit, optical splitter photodetectors 10.
Wavelength tunable laser 1 and laser with fixed wavelength 2 are respectively connected to the two wavelength-division ends of the first wavelength division multiplexer 3-1
Mouthful, the multiplexing port of the first wavelength division multiplexer 3-1 connects the light input end of electrooptic modulator 5, and signal generator 4 accesses Electro-optical Modulation
The output of the signal input part of device 5, electrooptic modulator 5 terminates the first delay line, and the first delay line connects optical splitter 9
Input terminal, the output end of optical splitter 9 connect the second delay line and third delay line respectively, and the second delay line connects
The input terminal of two wavelength division multiplexer 3-2, the second wavelength division multiplexer 3-2 output end connect two photodetectors 10 respectively, and third is prolonged
Slow line unit connects the input terminal of third wavelength division multiplexer 3-3, and the output end of third wavelength division multiplexer 3-3 connects third light all the way
Electric explorer 10, another way successively connect the 4th delay line and the 4th photodetector 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.
4th delay line includes the 4th optical circulator 6-4 and the 5th linear chirp optical fiber grating 8-5, third wave
1 port of the 4th optical circulator 6-4 of the termination of output all the way of division multiplexer 3-3,2 ports of the 4th optical circulator 6-4 connect the 5th
Linear chirp optical fiber grating 8-5,3 ports of the 4th optical circulator 6-4 connect the 4th photodetector 10.
The optical splitter 9 uses 1 × 2 optical splitter.
A kind of experimental method of the tunable true delay experimental provision based on wavelength-division multiplex, method and step are as follows:
It is step 1, four photodetectors 10 of the above-mentioned tunable true delay experimental provision based on wavelength-division multiplex are in parallel
Oscillograph 11 is accessed, step 2 is transferred to.
Step 2 opens Wavelength tunable laser 1 and laser with fixed wavelength 2, the wave that laser with fixed wavelength 2 exports
It is long to enter electrooptic modulator 5 behind the matching wavelength-division channel the first wavelength division multiplexer 3-1, and to carry out automatic signal generator 4 defeated
The microwave signal entered interferes, and the optical signal after being brought to is after the first optical circulator 6-1 in the first uniform fiber grating
It is reflected at 7-1, the optical signal after being reflected is divided into two paths of signals after optical splitter 9, passes through the second optical circulator all the way
Reflected at the second uniform fiber grating 7-2 after 6-2, the optical signal after being reflected through the second wavelength division multiplexer 3-2 therewith
Enter photodetector 10 behind matched wavelength-division channel, is finally shown on oscillograph 11；And another way optical signal passes through third
It is reflected at the 4th linear chirp optical fiber grating 8-4 after optical circulator 6-3, the optical signal after being reflected is answered through third wavelength-division
With photodetector 10 is entered behind device 3-3 matching wavelength-division channel, it is finally shown on oscillograph 11.
The wavelength that Wavelength tunable laser 1 the exports simultaneously wavelength-division channel matching through the first wavelength division multiplexer 3-1
Enter electrooptic modulator 5 afterwards, and carrys out the microwave signal that automatic signal generator 4 inputs and interfere, the optical signal warp after being brought to
It is reflected at the first linear chirp optical fiber grating 8-1 after crossing the first optical circulator 6-1, the optical signal after being reflected is through being divided
Equally it is divided into two paths of signals after device 9, all the way after the second optical circulator 6-2 at the second linear chirp optical fiber grating 8-2
It reflects, the optical signal after being reflected enters photodetection behind the matching wavelength-division channel the second wavelength division multiplexer 3-2
Device 10 is finally shown on oscillograph 11；And another way optical signal after third optical circulator 6-3 in third linear chirped light
It is reflected at fine grating 8-3, the optical signal after being reflected is laggard through the matching wavelength-division channel third wavelength division multiplexer 3-3
Enter the 4th optical circulator 6-4, enter photodetector 10 after compensatory reflex occurs at the 5th linear chirp optical fiber grating 8-5,
It is finally shown on 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 Wavelength tunable laser 1 and the 4th linear chirp optical fiber grating 8-4, observation is simultaneously
The record 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, draw four road signals delay inequality with Wavelength tunable laser 1 wavelength change Dynamic Graph, analysis
The tuning precision and tuning range of tunable true delay experimental provision based on wavelength-division multiplex.
The optical splitter 9 uses 1 × 2 optical splitter, and two output ends are isometric.
The wavelength of the laser with fixed wavelength 2 is outside the wave-length coverage of Wavelength tunable laser 1.
The first wavelength division multiplexer 3-1, the second wavelength division multiplexer 3-2 are identical with third wavelength division multiplexer 3-3, often
The wave-length coverage in two wavelength-division channels covers the wavelength of respective laser output in a wavelength division multiplexer, and wave-length coverage does not have
It is overlapping.
It is described using the central wavelength reflection position of the 5th linear chirp optical fiber grating 8-5 as measuring basis, guarantee the second wave
Input terminal aplanatism of the wavelength-division port of division multiplexer 3-2 and third wavelength division multiplexer 3-3 to four photodetectors 10.
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 center of second linear chirp optical fiber grating 8-2, third linear chirped fiber grating 8-3, the 5th linear chirp optical fiber grating 8-5
Reflection wavelength is identical as the central wavelength of Wavelength tunable laser 1.
Four 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 the 1/2 of third linear chirped fiber grating 8-3, is the 4th linear chirp optical fiber grating 8-4-1/2nd, is the 5th linear chrip
- the 1/2 of fiber grating 8-5.
The center of the first uniform fiber grating 7-1 and the central wavelength of the first linear chirp optical fiber grating 8-1
Reflection position distance is 2L, the center of the center of the second uniform fiber grating 7-2 and the second linear chirp optical fiber grating 8-2
Wavelength reflection positional 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 range of L is 10 ~ 20mm.
In above-mentioned steps 4, the wavelength of simultaneous tuning Wavelength tunable laser 1 and the 4th linear chirp optical fiber grating 8-4,
Guarantee under the output wavelength, the output of the delay inequalities such as four road signals.
Embodiment 1
Experiment tests the laser 2 of a fixed wave length, output wavelength 1542.9nm；A tunable wave length laser
Device 1, central wavelength 1550.9nm, tuning range are；First wavelength division multiplexer 3-1, the second wavelength division multiplexer 3-2
Identical with third wavelength division multiplexer 3-3, 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 4mm, the first linear chirp optical fiber grating 8-
1 center reflection wavelength is 1550.9nm, chirp coefficient 3nm/cm, grating length 12mm, and two grating head and the tail spacing are
12mm；The reflection wavelength of second uniform fiber grating 7-2 is 1542.9nm, grating length 4mm, the second linearly chirped fiber light
The center reflection wavelength of grid 8-2 is 1550.9nm, chirp coefficient 6nm/cm, grating length 6mm, and two grating head and the tail spacing are
5mm；The reflection wavelength of third linear chirped fiber grating 8-3 is 1550.9nm, chirp coefficient 6nm/cm, and grating length is
The center reflection wavelength of 6mm, the 4th linear chirp optical fiber grating 8-4 are 1542.9nm, and chirp coefficient is -6nm/cm, and grating is long
Degree is 6mm, and two grating head and the tail spacing are 4mm；The reflection wavelength of 5th linear chirp optical fiber grating 8-5 is 1550.9nm, chirp
Coefficient is -6nm/cm, grating length 6mm；The internal optical fiber length of four photodetectors 10 is 40mm；Rest part has
Isometric requirement, light path is 1000mm；The output frequency of signal generator 4 is 3GHz, and the working frequency of electrooptic modulator 5 is not
Greater than 12GHz, the look-in frequency of four photodetectors 10 is not more than 12GHz, and the working frequency of oscillograph 11 is 0 ~ 4GHz；Its
Test device is as shown in Fig. 2, a kind of experimental method of the tunable true delay experimental provision based on wavelength-division multiplex, method and step
Are as follows:
It is step 1, four photodetectors 10 of the above-mentioned tunable true delay experimental provision based on wavelength-division multiplex are in parallel
Oscillograph 11 is accessed, step 2 is transferred to.
Step 2 opens Wavelength tunable laser 1 and laser with fixed wavelength 2, the wave that laser with fixed wavelength 2 exports
It is long to enter electrooptic modulator 5 behind the matching wavelength-division channel the first wavelength division multiplexer 3-1, and to carry out automatic signal generator 4 defeated
The microwave signal entered interferes, and the optical signal after being brought to is after the first optical circulator 6-1 in the first uniform fiber grating
It is reflected at 7-1, the optical signal after being reflected is divided into two paths of signals after optical splitter 9, passes through the second optical circulator all the way
Reflected at the second uniform fiber grating 7-2 after 6-2, the optical signal after being reflected through the second wavelength division multiplexer 3-2 therewith
Enter photodetector 10 behind matched wavelength-division channel, is finally shown on oscillograph 11；And another way optical signal passes through third
It is reflected at the 4th linear chirp optical fiber grating 8-4 after optical circulator 6-3, the optical signal after being reflected is answered through third wavelength-division
With photodetector 10 is entered behind device 3-3 matching wavelength-division channel, it is finally shown on oscillograph 11.
The wavelength that Wavelength tunable laser 1 exports is laggard through the matching wavelength-division channel the first wavelength division multiplexer 3-1
Enter electrooptic modulator 5, and carry out the microwave signal of the input of automatic signal generator 4 and interfere, the optical signal after being brought to is by the
It is reflected at the first linear chirp optical fiber grating 8-1 after one optical circulator 6-1, the optical signal after being reflected is through optical splitter 9
Equally it is divided into two paths of signals afterwards, occurs at the second linear chirp optical fiber grating 8-2 after the second optical circulator 6-2 all the way
Reflection, the optical signal after being reflected enter photodetector 10 behind the matching wavelength-division channel the second wavelength division multiplexer 3-2,
It is finally shown on oscillograph 11；And another way optical signal after third optical circulator 6-3 in third linear chirped fiber light
It is reflected at grid 8-3, the optical signal after being reflected enters the behind the matching wavelength-division channel third wavelength division multiplexer 3-3
Four optical circulator 6-4 enter photodetector 10 after compensatory reflex occurs at the 5th linear chirp optical fiber grating 8-5, finally
It is shown on 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 Wavelength tunable laser 1 and the 4th linear chirp optical fiber grating 8-4, observation is simultaneously
The record 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, draw four road signals delay inequality with Wavelength tunable laser 1 wavelength change Dynamic Graph, analysis
The tuning precision and tuning range of tunable true delay experimental provision based on wavelength-division multiplex.
In conjunction with Fig. 1 ~ Fig. 4, wavelength and fourth linear chrip light of the implementation case in untuned Wavelength tunable laser 1
In the case where fine grating 8-4, the four road signals that delay inequality is 100ps are exported；On this basis, simultaneous tuning tunable wave length swashs
The delay inequality of the wavelength of light device 1 and the 4th linear chirp optical fiber grating 8-4, four road signals accordingly change；And then it is somebody's turn to do
The tuning precision and tuning range of tunable true delayed time system.The present invention may be implemented in multiplexed signals when a certain signal delay
Between independent tuning, reduce error source, improve tuning precision, expand tuning range, meanwhile, structure is simple, and production is difficult
It spends low.
Claims (8)
1. a kind of tunable true delay experimental provision based on wavelength-division multiplex, it is characterised in that: including Wavelength tunable laser
(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), signal generator (4), electrooptic modulator (5), the first delay line, the second delay line, third delay line list
Member, the 4th delay line, optical splitter (9), four photodetectors (10)；
Wavelength tunable laser (1) and laser with fixed wavelength (2) are respectively connected to two wavelength-divisions of the first wavelength division multiplexer (3-1)
Port, the multiplexing port of the first wavelength division multiplexer (3-1) connect the light input end of electrooptic modulator (5), signal generator (4) access
The output of the signal input part of electrooptic modulator (5), electrooptic modulator (5) terminates the first delay line, the first delay line list
Member connects the input terminal of optical splitter (9), and the output end of optical splitter (9) connects the second delay line and third delay line respectively,
Second delay line connects the input terminal of the second wavelength division multiplexer (3-2), and the second wavelength division multiplexer (3-2) output end connects two respectively
A photodetector (10), third delay line connect the input terminal of third wavelength division multiplexer (3-3), third wavelength division multiplexer
The output end of (3-3) connects third photodetector (10) all the way, and another way successively connects the 4th delay line and the 4th light
Electric explorer (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 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 line
Property chirped fiber grating (8-4), optical splitter (9) output termination third optical circulator (6-3) 1 port, third optical circulator
2 ports of (6-3) are sequentially connected in series third linear chirped fiber grating (8-3) and the 4th linear chirp optical fiber grating (8-4), third
3 ports of optical circulator (6-3) connect the input terminal of third wavelength division multiplexer (3-3)；
4th delay line includes the 4th optical circulator (6-4) and the 5th linear chirp optical fiber grating (8-5), third wave
The output all the way of division multiplexer (3-3) terminates 1 port of the 4th optical circulator (6-4), 2 ports of the 4th optical circulator (6-4)
The 5th linear chirp optical fiber grating (8-5) is connect, 3 ports of the 4th optical circulator (6-4) connect the 4th photodetector (10).
2. the tunable true delay experimental provision according to claim 1 based on wavelength-division multiplex, it is characterised in that: described point
Light device (9) uses 1 × 2 optical splitter.
3. the experimental method of the tunable true delay experimental provision according to claim 1 based on wavelength-division multiplex, feature
It is, method and step is as follows:
Step 1, by it is above-mentioned based on wavelength-division multiplex it is tunable it is true delay experimental provision four photodetectors (10) and couple
Enter oscillograph (11), is transferred to step 2；
Step 2 opens Wavelength tunable laser (1) and laser with fixed wavelength (2), laser with fixed wavelength (2) output
Wavelength enters electrooptic modulator (5) behind the matching wavelength-division channel of the first wavelength division multiplexer (3-1), and comes from signal
The microwave signal of device (4) input interferes, and the optical signal after being brought to is uniform first after the first optical circulator (6-1)
It is reflected at fiber grating (7-1), the optical signal after being reflected is divided into two paths of signals after optical splitter (9), passes through all the way
It is reflected at the second uniform fiber grating (7-2) after second optical circulator (6-2), the optical signal after being reflected is through the second wave
Enter photodetector (10) behind the matching wavelength-division channel of division multiplexer (3-2), is finally shown on oscillograph (11)；And
Another way optical signal reflects at the 4th linear chirp optical fiber grating (8-4) after third optical circulator (6-3), anti-
Optical signal after penetrating enters photodetector (10) behind the matching wavelength-division channel of third wavelength division multiplexer (3-3), finally
It is shown on oscillograph (11)；
The wavelength of Wavelength tunable laser (1) the output simultaneously wavelength-division channel matching through the first wavelength division multiplexer (3-1)
Enter electrooptic modulator (5) afterwards, is interfered with the microwave signal for carrying out automatic signal generator (4) input, the light letter after being brought to
It number is reflected at the first linear chirp optical fiber grating (8-1) after the first optical circulator (6-1), the light letter after being reflected
Number equally it is divided into two paths of signals after optical splitter (9), all the way in the second linear chrip light after the second optical circulator (6-2)
It is reflected at fine grating (8-2), the wavelength-division channel matching through the second wavelength division multiplexer (3-2) of the optical signal after being reflected
Enter photodetector (10) afterwards, is finally shown on oscillograph (11)；And another way optical signal passes through third optical circulator (6-
3) it is reflected at third linear chirped fiber grating (8-3) after, the optical signal after being reflected is through third wavelength division multiplexer (3-
3) enter the 4th optical circulator (6-4) behind matching wavelength-division channel, occur at the 5th linear chirp optical fiber grating (8-5)
Enter photodetector (10) after compensatory reflex, is finally shown on 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 Wavelength tunable laser (1) and the 4th linear chirp optical fiber grating (8-4), observation is simultaneously
The record 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, draw four road signals delay inequality with Wavelength tunable laser (1) wavelength change Dynamic Graph, analyze base
In the tuning precision and tuning range of the tunable true delay experimental provision of wavelength-division multiplex.
4. the experimental method of the tunable true delay experimental provision according to claim 3 based on wavelength-division multiplex, feature
Be: 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 experimental method of the tunable true delay experimental provision according to claim 3 based on wavelength-division multiplex, feature
It is: using the central wavelength reflection position of the 5th linear chirp optical fiber grating (8-5) as measuring basis, guarantees the second wavelength-division multiplex
Input terminal aplanatism of the wavelength-division port of device (3-2) and third wavelength division multiplexer (3-3) to four photodetectors (10).
6. the experimental method of the tunable true delay experimental provision according to claim 3 based on wavelength-division multiplex, feature
It is: the spy of the modulating frequency, photodetector (10) of the output frequency and electrooptic modulator (5) of the signal generator (4)
The working frequency matching of measured frequency, oscillograph (11).
7. the experimental method of the tunable true delay experimental provision according to claim 3 based on wavelength-division multiplex, feature
It is: 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
Middle cardiac wave of the center reflection wavelength of (8-3), the 5th linear chirp optical fiber grating (8-5) with Wavelength tunable laser (1)
Length is identical；
Four optical circulators are identical；Four photodetectors (10) are identical.
8. the experimental method of the tunable true delay experimental provision according to claim 7 based on wavelength-division multiplex, feature
Be: the chirp coefficient of first linear chirp optical fiber grating (8-1) is the 1/2 of the second linear chirp optical fiber grating (8-2),
It is the 1/2 of third linear chirped fiber grating (8-3), is-the 1/2 of the 4th linear chirp optical fiber grating (8-4), is the 5th linear
- the 1/2 of chirped fiber grating (8-5)；
The center of first uniform fiber grating (7-1) and the central wavelength of the first linear chirp optical fiber grating (8-1) reflect
Positional distance is 2L, the center of the second uniform fiber grating (7-2) and the center of the second linear chirp optical fiber grating (8-2)
Wavelength reflection positional distance is L, in third linear chirped fiber grating (8-3) and the 4th linear chirp optical fiber grating (8-4)
The long reflection position distance of cardiac wave is L, and the range of L is 10 ~ 20mm.
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| CN109001709A (en) * | 2018-05-07 | 2018-12-14 | 南京理工大学 | Based on chirped FM grating 5bit fiber delay time network equipment and its design method |
| CN109600159B (en) * | 2018-10-26 | 2021-05-25 | 天津大学 | Beam synthesis framework based on highly-multiplexed true delay unit |
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