CN106646425A - Tunable true-time-delay experiment device and method based on wavelength division multiplexing - Google Patents
Tunable true-time-delay experiment device and method based on wavelength division multiplexing Download PDFInfo
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- CN106646425A CN106646425A CN201611139553.0A CN201611139553A CN106646425A CN 106646425 A CN106646425 A CN 106646425A CN 201611139553 A CN201611139553 A CN 201611139553A CN 106646425 A CN106646425 A CN 106646425A
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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 tunable true-time-delay experiment device and method based on wavelength division multiplexing, and the method comprises the steps: building the tunable true-time-delay experiment device based on the wavelength division multiplexing: building two groups of delay lines which are formed by the series connection of uniform fiber bragg gratings and chirp fiber bragg gratings and one group of delay lines which are formed by the series connection of two chirp fiber bragg gratings, respectively connecting two ports of three optical circulators, enabling the three groups of delay lines to three arms of a 1*2 optical splitter so as to achieve the two-stage time delay, adding a delay compensation module to one delay channel, and finally connecting the remaining delay devices; carrying out the synchronous tuning of the wavelength of a laser with the tunable wavelength and the chirp fiber bragg gratings at one position, and achieving the real-time tuning of a tunable true-time-delay system. The deice achieves the independent tuning of the delay time of one signal of a multiplexing signal, reduces an error source, is high in tuning precision, is large in tuning range, is simple in structure, and is low in manufacturing difficulty.
Description
Technical field
The invention belongs to technical field of optical fiber communication, and in particular to a kind of tunable true time delay based on wavelength-division multiplex is tested
Device and its experimental technique.
Background technology
Radar is constantly expanded as the key technology defended in military strategy and strike back, its intension and research contents.It is light-operated
Phased array technology shows good performance under the conditions of work such as strong clutter, strong jamming and hard strike, with very big
Technology Potential, therefore its development and research receive most attention both domestic and external.
It is exactly Optically controlled microwave thunder using fibre delay line as the phased-array radar of delay device.Its core is light-operated phased
Array antenna, is formed by the arrangement of many radiating elements.Existing tunable true delayed time system is mainly included to laser output wavelength
Tuning, the tuning to fiber grating, the switching of photoswitch etc..In specific system design, limited by cost, space chi
Very little constraint, the interference of electromagnetic field, tuning range are little, the low various problems of tuning precision.Therefore, Chinese scholars are devoted to always
Design and improvement to tunable true delayed time system.
2008, Nanyang Technolohy University Pham Q. Thai et al. existed《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.The system includes 2 unicasts
Long laser instrument, 2 tunable narrow-linewidth single wavelength lasers,、For one group,、For one group.First group of two-beam quilt
After microwave signal modulation, two different time delays are obtained in multichannel chirp grating, the delay inequality of two-beam is.Afterwards through
Optical splitter enters different passages, in first wavelength-division passage, is directly over solution wavelength division multiplexer, photodetector and demodulates
Come；In second wavelength-division passage, addition of a delay time isAdjustable time delay.By laser instrument、Export four groups
Electric signal, the delay inequality between array element is.In the same manner, by laser instrument、Four groups of electric signals of output, the delay inequality between array element is.The system tunning adjustable time delay, introduces multiple path errors, while needing to tune multiple devices, operates more complicated.
The content of the invention
It is an object of the invention to provide a kind of tunable true time delay experimental provision and its experiment side based on wavelength-division multiplex
Method, by simultaneous tuning linear chirp optical fiber grating and the output wavelength of laser instrument, realizes to the real-time of system signal delay inequality
Tuning and control.The present invention can individually be tuned to a certain signal delay time in multiplexed signals, reduce error source, be adjusted
Humorous high precision, tuning range is big, meanwhile, simple structure, manufacture difficulty is low.
The technical solution for realizing the object of the invention is：A kind of tunable true time delay experiment dress based on wavelength-division multiplex
Put, including Wavelength tunable laser, laser with fixed wavelength, the first wavelength division multiplexer, the second wavelength division multiplexer, the 3rd wavelength-division
Multiplexer, signal generator, electrooptic modulator, the first delay line, the second delay line, the 3rd 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 of optical splitter, optical splitter
Output end connect the second delay line and the 3rd delay line respectively, the second delay line connects the second wavelength division multiplexer
Input, the second wavelength division multiplexer output end connects respectively two photodetectors, and the 3rd delay line connects the 3rd wavelength-division multiplex
The input of device, the output end of the 3rd wavelength division multiplexer connects all the way the 3rd photodetector, and another road connects successively the 4th delay
Line unit and the 4th photodetector.
A kind of experimental technique of the tunable true time delay experimental provision based on wavelength-division multiplex, method and step is as follows：
Step 1, the in parallel access of four photodetectors of the above-mentioned tunable true time delay experimental provision based on wavelength-division multiplex is shown
Ripple device, proceeds to step 2；
Step 2, opening Wavelength tunable laser and laser with fixed wavelength, the wavelength Jing first of laser with fixed wavelength output
Electrooptic modulator is entered after the matching wavelength-division passage of wavelength division multiplexer, is sent out with the microwave signal for carrying out automatic signal generator input
Raw to interfere, the optical signal after being brought to is after the first optical circulator in the first uniform fiber grating（7-1）Place is reflected, quilt
Optical signal after reflection is divided into two paths of signals Jing after optical splitter, all the way in the second uniform optical fiber light after the second optical circulator
Reflect at grid, the optical signal after being reflected enters photodetection Jing after the matching wavelength-division passage of the second wavelength division multiplexer
Device, is finally shown on oscillograph；And another road optical signal after the 3rd optical circulator in the 4th linear chirp optical fiber grating
Place is reflected, and the optical signal after being reflected enters photodetection Jing after the matching wavelength-division passage of the 3rd wavelength division multiplexer
Device, is finally shown on oscillograph；
The wavelength of Wavelength tunable laser output simultaneously enters electricity Jing after the matching wavelength-division passage of the first wavelength division multiplexer
Optical modulator, interferes with the microwave signal for carrying out automatic signal generator input, and the optical signal after being brought to is through first ring of light
Reflect at the first linear chirp optical fiber grating after row device, the optical signal after being reflected equally is divided into two Jing after optical splitter
Road signal, reflects all the way after the second optical circulator at the second linear chirp optical fiber grating, the light letter after being reflected
Photodetector is entered number Jing after the matching wavelength-division passage of the second wavelength division multiplexer, is finally shown on oscillograph；And it is another
All the way optical signal reflects after the 3rd optical circulator at third linear chirped fiber grating, the optical signal after being reflected
The 4th optical circulator is entered Jing after the matching wavelength-division passage of the 3rd wavelength division multiplexer, at the 5th linear chirp optical fiber grating
Photodetector is entered after generation compensatory reflex, is finally shown on oscillograph；
The delay inequality that now four road signals show on oscillograph is observed and recorded, step 3 is proceeded to；
Step 3, the wavelength of simultaneous tuning Wavelength tunable laser and the 4th linear chirp optical fiber grating, observe and record now
The delay inequality that four road signals show on oscillograph, proceeds to step 4；
Step 4, repeat step 3, the wavelength to long wave or shortwave direction simultaneous tuning Wavelength tunable laser is linear with the 4th
Chirped fiber grating, under observing and recording now corresponding wavelength, the delay inequality that four road signals show on oscillograph；Until super
Go out the reflection spectral limit of the second linear chirp optical fiber grating, proceed to step 5；
Step 5, Dynamic Graph of the delay inequality with the wavelength change of Wavelength tunable laser for drawing four road signals, analysis is based on ripple
Divide the tuning precision and tuning range of the tunable true time delay experimental provision of multiplexing.
Compared with prior art, its remarkable advantage is the present invention：
（1）Error source is reduced, tuning precision is improve, tuning range is expanded.
（2）Realize the independent tuning to a certain signal delay time in multiplexed signals.
（3）Device is simple, and manufacture difficulty is low, cost-effective.
Description of the drawings
Fig. 1 is tunable true time delay experimental provision structure chart of the present invention based on wavelength-division multiplex.
Fig. 2 is test structure figure of the present invention based on the tunable true time delay experimental provision of wavelength-division multiplex.
When Fig. 3 is the output wavelength and tunable linear chirp optical fiber grating of untuned Wavelength tunable laser of the present invention
True time delay schematic diagram.
Fig. 4 is the output wavelength and tunable linear chirp optical fiber grating of simultaneous tuning Wavelength tunable laser of the present invention
When true time delay schematic diagram.
Specific embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings.
With reference to Fig. 1 and Fig. 2, a kind of tunable true time delay experimental provision based on wavelength-division multiplex, 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, the 3rd wavelength division multiplexer 3-3,
Signal generator 4, electrooptic modulator 5, the first delay line, the second delay line, the 3rd delay line, the 4th postpone
Line unit, 9, four photodetectors 10 of optical splitter.
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 signal input part of device 5, the output of electrooptic modulator 5 terminates the first delay line, and the first delay line connects optical splitter 9
Input, the output end of optical splitter 9 connects respectively the second delay line and the 3rd delay line, and the second delay line connects
The input of two wavelength division multiplexer 3-2, the second wavelength division multiplexer 3-2 output ends connect respectively two photodetectors 10, and the 3rd prolongs
Late line unit connects the input of the 3rd wavelength division multiplexer 3-3, and the output end of the 3rd wavelength division multiplexer 3-3 connects all the way the 3rd light
Electric explorer 10, another road connects successively 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
Sing fiber grating 8-1,1 port of the output first optical circulator 6-1 of 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 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
Sing fiber grating 8-2,1 port of the output second optical circulator 6-2 of termination of optical splitter 9,2 ports of the second optical circulator 6-2
The second uniform fiber grating 7-2 and the second linear chirp optical fiber grating 8-2 is sequentially connected in series, 3 ports of the second optical circulator 6-2 connect
The input of the second wavelength division multiplexer 3-2.
3rd delay line includes the 3rd 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 the 3rd optical circulator 6-3 1 port, the 2 of the 3rd 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, the 3rd optical circulator 6-3
3 ports connect the input of the 3rd 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, the 3rd ripple
1 port of the 4th optical circulator 6-4 of termination of output all the way of division multiplexer 3-3,2 ports of the 4th optical circulator 6-4 connect the 5th
3 ports of linear chirp optical fiber grating 8-5, the 4th optical circulator 6-4 connect the 4th photodetector 10.
The optical splitter 9 adopts 1 × 2 optical splitter.
A kind of experimental technique of the tunable true time delay experimental provision based on wavelength-division multiplex, method and step is as follows：
Step 1, access four photodetectors 10 of the above-mentioned tunable true time delay experimental provision based on wavelength-division multiplex are in parallel
Oscillograph 11, proceeds to step 2.
Step 2, opening Wavelength tunable laser 1 and laser with fixed wavelength 2, the ripple of the output of laser with fixed wavelength 2
Electrooptic modulator 5 is entered after the long wavelength-division passage matching Jing the first wavelength division multiplexer 3-1, and to carry out automatic signal generator 4 defeated
The microwave signal for entering is interfered, and the optical signal after being brought to is after the first optical circulator 6-1 in the first uniform fiber grating
Reflect at 7-1, the optical signal after being reflected is divided into two paths of signals Jing after optical splitter 9, all the way through the second optical circulator
Reflect at the second uniform fiber grating 7-2 after 6-2, the second wavelength division multiplexers of the optical signal Jing 3-2 after being reflected is therewith
Photodetector 10 is entered after the wavelength-division passage of matching, is finally shown on oscillograph 11；And another road optical signal is through the 3rd
Reflect at the 4th linear chirp optical fiber grating 8-4 after optical circulator 6-3, the wavelength-divisions of optical signal Jing the 3rd after being reflected are answered
With photodetector 10 is entered after device 3-3 matching wavelength-division passage, it is finally shown on oscillograph 11.
While wavelength Jing the first wavelength division multiplexer 3-1 of the output of Wavelength tunable laser 1 matching wavelength-division passage
Afterwards enter electrooptic modulator 5, and come automatic signal generator 4 input microwave signal interfere, the optical signal Jing after being brought to
Cross after the first optical circulator 6-1 and reflected at the first linear chirp optical fiber grating 8-1, the optical signal Jing light splitting after being reflected
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
Reflect, the optical signal after being reflected enters photodetection Jing after the matching wavelength-division passages of the second wavelength division multiplexer 3-2
Device 10, is finally shown on oscillograph 11；And another road optical signal after the 3rd optical circulator 6-3 in third linear chirped light
Reflect at fine grating 8-3, the wavelength division multiplexer 3-3 of optical signal Jing the 3rd after being reflected matching wavelength-division passage is laggard
Enter the 4th optical circulator 6-4, after there is compensatory reflex at the 5th linear chirp optical fiber grating 8-5 photodetector 10 entered,
It is finally shown on oscillograph 11.
The delay inequality that now four road signals show on oscillograph 11 is observed and recorded, step 3 is proceeded 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 now four road signals show on oscillograph 11, proceeds to step 4.
Step 4, repeat step 3, to long wave or the wavelength and the 4th of shortwave direction simultaneous tuning Wavelength tunable laser 1
Linear chirp optical fiber grating 8-4, under observing and recording now corresponding wavelength, the time delay that four road signals show on oscillograph 11
Difference；Until beyond the reflection spectral limit of the second linear chirp optical fiber grating 8-2, proceeding to step 5.
Step 5, Dynamic Graph of the delay inequality with the wavelength change of Wavelength tunable laser 1 for drawing four road signals, analysis
Tuning precision and tuning range based on the tunable true time delay experimental provision of wavelength-division multiplex.
The optical splitter 9 adopts 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 and the 3rd wavelength division multiplexer 3-3 are identical, often
The wave-length coverage of two wavelength-division passages covers the wavelength of respective laser instrument output in individual wavelength division multiplexer, and wave-length coverage does not have
It is overlapping.
The centre wavelength reflection position with the 5th linear chirp optical fiber grating 8-5 is as measuring basis, it is ensured that the second ripple
Input aplanatism of the wavelength-division port of division multiplexer 3-2 and the 3rd 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 operating 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 with the wavelength of laser with fixed wavelength 2.First linear chirp optical fiber grating 8-1,
Second linear chirp optical fiber grating 8-2, third linear chirped fiber grating 8-3, the center of the 5th linear chirp optical fiber grating 8-5
Reflection wavelength is identical with the centre 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 centre wavelength of the first linear chirp optical fiber grating 8-1
Reflection position distance is the center of 2L, 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 the middle cardiac wave of L, 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 scope 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,
Under ensureing the output wavelength, the output of the delay inequality such as four road signals.
Embodiment 1
The experiment test laser instrument 2 of a fixed wave length, output wavelength is 1542.9nm；A Wavelength tunable laser 1,
Centre 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 identical, and the wave-length coverage of its two-way wavelength-division passage is respectively：、；The
The reflection wavelength of one uniform fiber grating 7-1 is 1542.9nm, and grating length is 4mm, the first linear chirp optical fiber grating 8-1's
Center reflection wavelength is 1550.9nm, and chirp coefficient is 3nm/cm, and grating length is 12mm, and two grating head and the tail spacing are 12mm；
The reflection wavelength of the second uniform fiber grating 7-2 is 1542.9nm, and grating length is 4mm, the second linear chirp optical fiber grating 8-2
Center reflection wavelength be 1550.9nm, chirp coefficient is 6nm/cm, and grating length is 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, and chirp coefficient is 6nm/cm, and grating length is 6mm, the
The center reflection wavelength of four linear chirp optical fiber grating 8-4 is 1542.9nm, and chirp coefficient is -6nm/cm, and grating length is
6mm, two grating head and the tail spacing are 4mm；The reflection wavelength of the 5th linear chirp optical fiber grating 8-5 be 1550.9nm, chirp coefficient
For -6nm/cm, grating length is 6mm；The internal optical fiber length of four photodetectors 10 is 40mm；Remainder has isometric
Require, light path is 1000mm；The output frequency of signal generator 4 is 3GHz, and the operating frequency of electrooptic modulator 5 is not more than
12GHz, the look-in frequency of four photodetectors 10 is not more than 12GHz, and the operating frequency of oscillograph 11 is 0 ~ 4GHz；Its test
As shown in Fig. 2 a kind of experimental technique of the tunable true time delay experimental provision based on wavelength-division multiplex, its method and step is device：
Step 1, access four photodetectors 10 of the above-mentioned tunable true time delay experimental provision based on wavelength-division multiplex are in parallel
Oscillograph 11, proceeds to step 2.
Step 2, opening Wavelength tunable laser 1 and laser with fixed wavelength 2, the ripple of the output of laser with fixed wavelength 2
Electrooptic modulator 5 is entered after the long wavelength-division passage matching Jing the first wavelength division multiplexer 3-1, and to carry out automatic signal generator 4 defeated
The microwave signal for entering is interfered, and the optical signal after being brought to is after the first optical circulator 6-1 in the first uniform fiber grating
Reflect at 7-1, the optical signal after being reflected is divided into two paths of signals Jing after optical splitter 9, all the way through the second optical circulator
Reflect at the second uniform fiber grating 7-2 after 6-2, the second wavelength division multiplexers of the optical signal Jing 3-2 after being reflected is therewith
Photodetector 10 is entered after the wavelength-division passage of matching, is finally shown on oscillograph 11；And another road optical signal is through the 3rd
Reflect at the 4th linear chirp optical fiber grating 8-4 after optical circulator 6-3, the wavelength-divisions of optical signal Jing the 3rd after being reflected are answered
With photodetector 10 is entered after device 3-3 matching wavelength-division passage, it is finally shown on oscillograph 11.
The wavelength-division passage that wavelength Jing the first wavelength division multiplexer 3-1 of the output of Wavelength tunable laser 1 are matching is laggard
Enter electrooptic modulator 5, and carry out the microwave signal of the input of automatic signal generator 4 to interfere, the optical signal after being brought to is through the
Reflect at the first linear chirp optical fiber grating 8-1 after one optical circulator 6-1, the optical signal Jing optical splitters 9 after being reflected
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 enters photodetector 10 Jing after the matching wavelength-division passages of the second wavelength division multiplexer 3-2,
It is finally shown on oscillograph 11；And another road optical signal after the 3rd optical circulator 6-3 in third linear chirped fiber light
Reflect at grid 8-3, the optical signal after being reflected enters the Jing after the matching wavelength-division passages of the 3rd wavelength division multiplexer 3-3
Four optical circulator 6-4, enter photodetector 10, finally after there is compensatory reflex at the 5th linear chirp optical fiber grating 8-5
It is displayed on oscillograph 11.
The delay inequality that now four road signals show on oscillograph 11 is observed and recorded, step 3 is proceeded to；
Step 3, the wavelength of simultaneous tuning Wavelength tunable laser 1 and the 4th linear chirp optical fiber grating 8-4, observe and record
The delay inequality that now four road signals show on oscillograph 11, proceeds to step 4.
Step 4, repeat step 3, to long wave or the wavelength and the 4th of shortwave direction simultaneous tuning Wavelength tunable laser 1
Linear chirp optical fiber grating 8-4, under observing and recording now corresponding wavelength, the time delay that four road signals show on oscillograph 11
Difference；Until beyond the reflection spectral limit of the second linear chirp optical fiber grating 8-2, proceeding to step 5.
Step 5, Dynamic Graph of the delay inequality with the wavelength change of Wavelength tunable laser 1 for drawing four road signals, analysis
Tuning precision and tuning range based on the tunable true time delay experimental provision of wavelength-division multiplex.
With reference to Fig. 1 ~ Fig. 4, wavelength and fourth linear chrip light of the implementation case in untuned Wavelength tunable laser 1
In the case of fine grating 8-4, four road signals of the delay inequality for 100ps are exported；On this basis, simultaneous tuning tunable wave length swashs
The wavelength of light device 1 and the 4th linear chirp optical fiber grating 8-4, the delay inequality of four road signals accordingly changes；And then be somebody's turn to do
The tuning precision and tuning range of tunable true delayed time system.The present invention can be realized in multiplexed signals during a certain signal delay
Between independent tuning, reduce error source, improve tuning precision, expand tuning range, meanwhile, simple structure, it is difficult to make
Degree is low.
Claims (9)
1. a kind of tunable true time 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）, the 3rd wavelength division multiplexer
（3-3）, signal generator（4）, electrooptic modulator（5）, the first delay line, the second delay line, the 3rd delay line list
Unit, the 4th delay line, optical splitter（9）, four photodetectors（10）；
Wavelength tunable laser（1）And laser with fixed wavelength（2）It is respectively connected to the first wavelength division multiplexer（3-1）Two wavelength-divisions
Port, the first wavelength division multiplexer（3-1）Multiplexing port connect electrooptic modulator（5）Light input end, signal generator（4）Access
Electrooptic modulator（5）Signal input part, electrooptic modulator（5）Output terminate the first delay line, the first delay line list
Unit connects optical splitter（9）Input, optical splitter（9）Output end connect the second delay line and the 3rd delay line respectively,
Second delay line connects the second wavelength division multiplexer（3-2）Input, the second wavelength division multiplexer（3-2）Output end connects respectively two
Individual photodetector（10）, the 3rd delay line connects the 3rd wavelength division multiplexer（3-3）Input, the 3rd wavelength division multiplexer
（3-3）Output end, the 3rd photodetector is connect all the way（10）, another road connects successively the 4th delay line and the 4th light
Electric explorer（10）.
2. the tunable true time delay experimental provision based on wavelength-division multiplex according to claim 1, it is characterised in that：Described
One delay line includes the first optical circulator（6-1）, the first uniform fiber grating（7-1）With the first linear chirp optical fiber grating
（8-1）, electrooptic modulator（5）Output terminate the first optical circulator（6-1）1 port, the first optical circulator（6-1）2 ends
Mouth is sequentially connected in series the first uniform fiber grating（7-1）With the first linear chirp optical fiber grating（8-1）, the first optical circulator（6-1）
3 ports connect optical splitter（9）Input；
Second delay line includes the second optical circulator（6-2）, the second uniform fiber grating（7-2）Zhou linear with second
Sing fiber grating（8-2）, optical splitter（9）Output terminate the second optical circulator（6-2）1 port, the second optical circulator（6-2）
2 ports be sequentially connected in series the second uniform fiber grating（7-2）With the second linear chirp optical fiber grating（8-2）, the second optical circulator
（6-2）3 ports connect the second wavelength division multiplexer（3-2）Input；
3rd delay line includes the 3rd 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 terminate the 3rd optical circulator（6-3）1 port, the 3rd optical circulator
（6-3）2 ports be sequentially connected in series third linear chirped fiber grating（8-3 and the 4th linear chirp optical fiber grating（8-4）, the 3rd
Optical circulator（6-3）3 ports connect the 3rd wavelength division multiplexer（3-3）Input；
4th delay line includes the 4th optical circulator（6-4）With the 5th linear chirp optical fiber grating（8-5）, the 3rd ripple
Division multiplexer（3-3）Output all the way terminate the 4th optical circulator（6-4）1 port, the 4th optical circulator（6-4）2 ports
Connect the 5th linear chirp optical fiber grating（8-5）, the 4th optical circulator（6-4）3 ports connect the 4th photodetector（10）.
3. the tunable true time delay experimental provision based on wavelength-division multiplex according to claim 1, it is characterised in that：Described point
Light device（9）Using 1 × 2 optical splitter.
4. the experimental technique of the tunable true time delay experimental provision based on wavelength-division multiplex according to claim 1, its feature
It is that method and step is as follows：
Step 1, by four photodetectors of the above-mentioned tunable true time delay experimental provision based on wavelength-division multiplex（10）And couple
Enter oscillograph（11）, proceed to step 2；
Step 2, opening Wavelength tunable laser（1）And laser with fixed wavelength（2）, laser with fixed wavelength（2）Output
The wavelength division multiplexers of wavelength Jing first（3-1）Electrooptic modulator is entered after matching wavelength-division passage（5）, and occur from signal
Device（4）The microwave signal of input is interfered, and the optical signal after being brought to is through the first optical circulator（6-1）It is uniform first afterwards
Fiber grating（7-1）Place is reflected, the optical signal Jing optical splitters after being reflected（9）After be divided into two paths of signals, pass through all the way
Second optical circulator（6-2）Afterwards in the second uniform fiber grating（7-2）Place is reflected, the ripples of optical signal Jing second after being reflected
Division multiplexer（3-2）Photodetector is entered after matching wavelength-division passage（10）, it is finally shown in oscillograph（11）On；And
Another road optical signal is through the 3rd optical circulator（6-3）Afterwards in the 4th linear chirp optical fiber grating（8-4）Place is reflected, anti-
The wavelength division multiplexers of optical signal Jing the 3rd after penetrating（3-3）Photodetector is entered after matching wavelength-division passage（10）, finally
It is displayed in oscillograph（11）On；
While Wavelength tunable laser（1）The wavelength division multiplexers of wavelength Jing first of output（3-1）Matching wavelength-division passage
Electrooptic modulator is entered afterwards（5）, and carry out automatic signal generator（4）The microwave signal of input is interfered, the light letter after being brought to
Number through the first optical circulator（6-1）Afterwards in the first linear chirp optical fiber grating（8-1）Place is reflected, the light letter after being reflected
Number Jing optical splitters（9）Equally it is divided into two paths of signals afterwards, all the way through the second optical circulator（6-2）Afterwards in the second linear chrip light
Fine grating（8-2）Place is reflected, the wavelength division multiplexers of optical signal Jing second after being reflected（3-2）Matching wavelength-division passage
Photodetector is entered afterwards（10）, it is finally shown in oscillograph（11）On；And another road optical signal is through the 3rd optical circulator（6-
3）Afterwards in third linear chirped fiber grating（8-3）Place is reflected, the wavelength division multiplexers of optical signal Jing the 3rd after being reflected（3-
3）The 4th optical circulator is entered after matching wavelength-division passage（6-4）, in the 5th linear chirp optical fiber grating（8-5）Place occurs
Photodetector is entered after compensatory reflex（10）, it is finally shown in oscillograph（11）On；
Observe and record now four road signals in oscillograph（11）The delay inequality of upper display, proceeds to step 3；
Step 3, simultaneous tuning Wavelength tunable laser（1）Wavelength and the 4th linear chirp optical fiber grating（8-4）, observation is simultaneously
Record now four road signals in oscillograph（11）The delay inequality of upper display, proceeds to step 4；
Step 4, repeat step 3, to long wave or shortwave direction simultaneous tuning Wavelength tunable laser（1）Wavelength and the 4th line
Property chirped fiber grating（8-4）, under observing and recording now corresponding wavelength, four road signals are in oscillograph（11）Upper display is prolonged
The time difference；Until exceeding the second linear chirp optical fiber grating（8-2）Reflection spectral limit, proceed to step 5；
Step 5, the delay inequality of four road signals of drafting are with Wavelength tunable laser（1）Wavelength change Dynamic Graph, analyze base
In the tuning precision and tuning range of the tunable true time delay experimental provision of wavelength-division multiplex.
5. the experimental technique of the tunable true time delay experimental provision based on wavelength-division multiplex according to claim 4, its feature
It is：The laser with fixed wavelength（2）Wavelength in Wavelength tunable laser（1）Wave-length coverage outside；
First wavelength division multiplexer（3-1）, the second wavelength division multiplexer（3-2）With the 3rd wavelength division multiplexer（3-3）It is identical, each
The wave-length coverage of two wavelength-division passages covers the wavelength of respective laser instrument output in wavelength division multiplexer, and wave-length coverage is not handed over
It is folded；
Optical splitter（9）Two output ends it is isometric.
6. the experimental technique of the tunable true time delay experimental provision based on wavelength-division multiplex according to claim 4, its feature
It is：With the 5th linear chirp optical fiber grating（8-5）Centre wavelength reflection position be measuring basis, it is ensured that the second wavelength-division multiplex
Device（3-2）With the 3rd wavelength division multiplexer（3-3）Wavelength-division port to four photodetectors（10）Input aplanatism.
7. the experimental technique of the tunable true time delay experimental provision based on wavelength-division multiplex according to claim 4, its feature
It is：The signal generator（4）Output frequency and electrooptic modulator（5）Modulating frequency, photodetector（10）Spy
Measured frequency, oscillograph（11）Operating frequency matching.
8. the experimental technique of the tunable true time delay experimental provision based on wavelength-division multiplex according to claim 4, its feature
It is：First uniform fiber grating（7-1）, the second uniform fiber grating（7-2）Reflection wavelength, the 4th linear chrip light
Fine grating（8-4）Center reflection wavelength and laser with fixed wavelength（2）Wavelength it is identical；
First linear chirp optical fiber grating（8-1）, the second linear chirp optical fiber grating（8-2）, third linear chirped fiber grating
（8-3）, the 5th linear chirp optical fiber grating（8-5）Center reflection wavelength and Wavelength tunable laser（1）Middle cardiac wave
Length is identical；
Four optical circulators are identical；Four photodetectors（10）It is identical.
9. the experimental technique of the tunable true time delay experimental provision based on wavelength-division multiplex according to claim 8, its feature
It is：First linear chirp optical fiber grating（8-1）Chirp coefficient be the second linear chirp optical fiber grating（8-2）1/2,
It is third linear chirped fiber grating（8-3）1/2, be the 4th linear chirp optical fiber grating（8-4）- 1/2, be the 5th linear
Chirped fiber grating（8-5）- 1/2；
First uniform fiber grating（7-1）Center and the first linear chirp optical fiber grating（8-1）Centre wavelength reflection
Positional distance is 2L, the second uniform fiber grating（7-2）Center and the second linear chirp optical fiber grating（8-2）Center
Wavelength reflection positional distance be L, third linear chirped fiber grating（8-3）With the 4th linear chirp optical fiber grating（8-4）In
The long reflection position distance of cardiac wave is L, and the scope of L is 10 ~ 20mm.
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