CN108955888A - A kind of full optical fiber interferometer Free Spectral Range measuring system and method - Google Patents
A kind of full optical fiber interferometer Free Spectral Range measuring system and method Download PDFInfo
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- CN108955888A CN108955888A CN201810985909.5A CN201810985909A CN108955888A CN 108955888 A CN108955888 A CN 108955888A CN 201810985909 A CN201810985909 A CN 201810985909A CN 108955888 A CN108955888 A CN 108955888A
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 21
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- 239000000835 fiber Substances 0.000 claims abstract description 42
- 238000001228 spectrum Methods 0.000 claims abstract description 10
- 238000005259 measurement Methods 0.000 claims description 9
- 238000000691 measurement method Methods 0.000 claims description 7
- 230000005622 photoelectricity Effects 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/28—Investigating the spectrum
- G01J3/45—Interferometric spectrometry
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Abstract
The invention discloses a kind of full optical fiber interferometer Free Spectral Range measuring system and methods, utilize the microwave signal of vector network analyzer measuring transmitter input and the S21 parameter characteristic of photodetector output microwave signal, by the comb frequency spectrum at equal intervals of the S21 parameter for being converted to microwave signal of the Free Spectral Range of full-fiber Mach-Zehnder interferometer, pass through vector network analyzer S21Parameter observation calculates the Free Spectral Range of full-fiber Mach-Zehnder interferometer.This invention simplifies the complexity of the Free Spectral Range measuring system of full-fiber Mach-Zehnder interferometer, reduce the cost of system, and operating procedure is simple.
Description
Technical field
The present invention relates to a kind of Free Spectral Range measuring system and method, especially a kind of free light of full optical fiber interferometer
Spectral limit measuring system and method.
Background technique
All -fiber Mach-Zehnder interferometer because of it with small in size, light-weight, compact-sized, electromagnetism interference and
The features such as high sensitivity, is widely used in optical fiber sensing system and the communications field optical fibre wavelength-division multiplex (WDM).High performance light passes
Sensed quantity system and optical fiber telecommunications system have the Free Spectral Range of full-fiber Mach-Zehnder interferometer stringent
It is required that.Therefore, the Free Spectral Range of full-fiber Mach-Zehnder interferometer is the important parameter for determining its performance, traditional
Free Free Spectral Range measurement method is based on Fabry Perot etalon method or spectroanalysis instrument method, this 2 kinds of methods
Usual principle is simple, but is needed based on the Free Spectral Range mensuration of Fabry Perot etalon expensive adjustable
Humorous laser, and operating procedure is complicated, it is more demanding to the professional technique of operator.Although measuring letter based on spectroanalysis instrument
It is single, but it is limited to the wavelength stability of light source, measurement accuracy is low.
Summary of the invention
Technical problem to be solved by the invention is to provide a kind of full optical fiber interferometer Free Spectral Range measuring system and
Method.
In order to solve the above technical problems, the technical scheme adopted by the invention is that:
A kind of full optical fiber interferometer Free Spectral Range measuring system, it is characterised in that: include distributed feedback laser, electric light
Phase-modulator, full-fiber Mach-Zehnder interferometer, photodetector, power splitter, signal generator and vector network point
Analyzer, electro-optic phase modulator and distributed feedback laser light connects, full-fiber Mach-Zehnder interferometer and electric light phase
Position modulator light connects, photodetector and full-fiber Mach-Zehnder interferometer light connects, power splitter are sent out with signal respectively
Raw device, electro-optic phase modulator and vector network analyzer electrical connection, vector network analyzer are electrically connected with photodetector.
Further, the distributed feedback laser exports laser, and signal generator generates microwave signal, microwave signal
It is modulated to by electro-optic phase modulator on the light carrier of the output of distributed feedback laser, then imports all -fiber Mach-
Zehnder interferometer, full-fiber Mach-Zehnder interferometer output light are converted to microwave signal, microwave letter through photodetector
Number with signal generator output microwave signal input vector Network Analyzer.
Further, the distributed feedback laser exports 1550nm laser, and distributed feedback laser power is
10dBm。
Further, the microwave signal frequency that the signal generator generates is 10GHz.
A kind of measurement method of full optical fiber interferometer Free Spectral Range measuring system, it is characterised in that include following step
It is rapid:
Step 1: distributed feedback laser exports 1550nm laser, and the power of distributed feedback laser is 10dBm；
Step 2: the microwave signal of signal generator generation 10GHz；
Step 3: after phase modulator modulation, the microwave signal of 10GHz is modulated on 1550nm light carrier, and is imported
Full-fiber Mach-Zehnder interferometer；
Step 4: full-fiber Mach-Zehnder interferometer output light inputs photodetector；
Step 5: the microwave signal of the 10GHz of signal generator generation is measured with vector network analyzer analyzer and photoelectricity is visited
Survey the S of the microwave signal of device output21Parameter characteristic；
Step 6: S21The single comb frequency spectrum range at equal intervals of parameter is the freedom of full-fiber Mach-Zehnder interferometer
Spectral region.
Further, in the step 1, continuously enlarge or reduce signal generator output microwave signal frequency and
Power selects suitable microwave frequency and power, convenient for observation vector network analyzer S21Parameter.
Further, the step 5, multiplicating are measured signal generator with vector network analyzer analyzer and are generated
10GHz microwave signal and photodetector output microwave signal S21Then parameter characteristic is averaged.
Further, in the step 6, multiple comb frequency spectrums at equal intervals is measured, are averaged, measure full light to improve
The measurement accuracy of fine Mach-Zehnder interferometer Free Spectral Range.
Compared with prior art, the present invention having the following advantages that and effect: the present invention tunable swashs independent of expensive
The spectrum analysis of light device or finite resolving power, using common distributed feedback laser and high-precision vector network point
(frequency resolution can accomplish as 1Hz) analyzer, by vector network analyzer by full-fiber Mach-Zehnder interferometer freedom
Spectral region is converted into the S of microwave signal21The comb frequency spectrum at equal intervals of parameter, can accurately measure all -fiber Mach-Zehnder
The Free Spectral Range of interferometer.Method of the invention simplifies the Free Spectral Range of full-fiber Mach-Zehnder interferometer
The complexity of measuring system reduces the cost of system, and operating procedure is simple, can soon be completed by frequency sweep to complete
The measurement of Fiber Mach-Zehnder Interferometer Free Spectral Range, outcome measurement is intuitive, has good practical value.
Detailed description of the invention
Fig. 1 is a kind of schematic diagram of full optical fiber interferometer Free Spectral Range measuring system of the invention.
Fig. 2 is the by vector network analyzer that full-fiber Mach-Zehnder interferometer is free of the embodiment of the present invention
Spectral region is converted into the S of microwave signal21The comb frequency spectrum schematic diagram of parameter.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawing and by embodiment, and following embodiment is to this hair
Bright explanation and the invention is not limited to following embodiments.
As shown in Figure 1, a kind of full optical fiber interferometer Free Spectral Range measuring system of the invention, includes distributed Feedback
Laser 1, electro-optic phase modulator 2, full-fiber Mach-Zehnder interferometer 3, photodetector 4, power splitter 5, signal hair
Raw device 6 and vector network analyzer 7, electro-optic phase modulator 2 and 1 light connects of distributed feedback laser, all -fiber Mach-
Zehnder interferometer 3 and 2 light connects of electro-optic phase modulator, photodetector 4 and full-fiber Mach-Zehnder interferometer 3
Light connects, power splitter 5 are electrically connected with signal generator 6, electro-optic phase modulator 2 and vector network analyzer 7 respectively, vector net
Network analyzer 7 is electrically connected with photodetector 4.
Distributed feedback laser 1 exports laser, and signal generator 6 generates microwave signal, and microwave signal passes through electric light phase
On the light carrier for the output that position modulator 2 is modulated to distributed feedback laser 1, then import all -fiber Mach-Zehnder interference
Instrument 3,3 output light of full-fiber Mach-Zehnder interferometer are converted to microwave signal, microwave signal and signal through photodetector 4
The microwave signal input vector Network Analyzer 7 that generator 6 exports.
Distributed feedback laser 1 exports 1550nm laser, and distributed feedback laser power is 10dBm.Signal occurs
The microwave signal frequency that device 6 generates is 10GHz.
A kind of measurement method of full optical fiber interferometer Free Spectral Range measuring system comprising the steps of:
Step 1: distributed feedback laser exports 1550nm laser, and the power of distributed feedback laser is 10dBm；Continuously
The frequency and power for increasing or reducing signal generator output microwave signal, select suitable microwave frequency and power, are convenient for
Observe vector network analyzer S21Parameter.
Step 2: the microwave signal of signal generator generation 10GHz；
Step 3: after phase modulator modulation, the microwave signal of 10GHz is modulated on 1550nm light carrier, and is imported
Full-fiber Mach-Zehnder interferometer；
Step 4: full-fiber Mach-Zehnder interferometer output light inputs photodetector；
Step 5: the microwave signal of the 10GHz of signal generator generation is measured with vector network analyzer analyzer and photoelectricity is visited
Survey the S of the microwave signal of device output21Parameter characteristic；Multiplicating measures signal with vector network analyzer analyzer
The S of the microwave signal of microwave signal and the photodetector output for the 10GHz that device generates21Then parameter characteristic asks it flat
Mean value, to improve the measurement accuracy of measurement full-fiber Mach-Zehnder interferometer Free Spectral Range.
Step 6: as shown in Fig. 2, S21The single comb frequency spectrum range at equal intervals of parameter is all -fiber Mach-Zehnder
The Free Spectral Range of interferometer.Multiple comb frequency spectrums at equal intervals are measured, are averaged, measure all -fiber Mach- to improve
The measurement accuracy of Zehnder interferometer Free Spectral Range.
Spectrum analysis of the present invention independent of expensive tunable laser or finite resolving power, using common point
(frequency resolution can accomplish to pass through vector network point for 1Hz) for cloth feedback laser and high-precision vector network analyzer
Analyzer converts full-fiber Mach-Zehnder interferometer Free Spectral Range to the S of microwave signal21The pectination at equal intervals of parameter
Frequency spectrum can accurately measure the Free Spectral Range of full-fiber Mach-Zehnder interferometer.Method of the invention simplifies entirely
The complexity of the Free Spectral Range measuring system of Fiber Mach-Zehnder Interferometer, reduces the cost of system, Er Qiecao
Make that step is simple, the survey to full-fiber Mach-Zehnder interferometer Free Spectral Range can be soon completed by frequency sweep
Amount, outcome measurement is intuitive, has good practical value.
Above content is only illustrations made for the present invention described in this specification.Technology belonging to the present invention
The technical staff in field can do various modifications or supplement or is substituted in a similar manner to described specific embodiment, only
It should belong to guarantor of the invention without departing from the content or beyond the scope defined by this claim of description of the invention
Protect range.
Claims (8)
1. a kind of full optical fiber interferometer Free Spectral Range measuring system, it is characterised in that: include distributed feedback laser, electricity
Optical phase modulator, full-fiber Mach-Zehnder interferometer, photodetector, power splitter, signal generator and vector network
Analyzer, electro-optic phase modulator and distributed feedback laser light connects, full-fiber Mach-Zehnder interferometer and electric light
Phase-modulator light connects, photodetector and full-fiber Mach-Zehnder interferometer light connects, power splitter respectively with signal
Generator, electro-optic phase modulator and vector network analyzer electrical connection, vector network analyzer are electrically connected with photodetector.
2. a kind of full optical fiber interferometer Free Spectral Range measuring system described in accordance with the claim 1, it is characterised in that: described
Distributed feedback laser exports laser, and signal generator generates microwave signal, and microwave signal passes through electro-optic phase modulator tune
On the light carrier for making the output of distributed feedback laser, then full-fiber Mach-Zehnder interferometer is imported, all -fiber
Mach-Zehnder interferometer output light is converted to microwave signal through photodetector, what microwave signal and signal generator exported
Microwave signal input vector Network Analyzer.
3. a kind of full optical fiber interferometer Free Spectral Range measuring system described in accordance with the claim 1, it is characterised in that: described
Distributed feedback laser exports 1550nm laser, and distributed feedback laser power is 10dBm.
4. a kind of full optical fiber interferometer Free Spectral Range measuring system described in accordance with the claim 1, it is characterised in that: described
The microwave signal frequency that signal generator generates is 10GHz.
5. a kind of measurement method of full optical fiber interferometer Free Spectral Range measuring system, it is characterised in that comprise the steps of:
Step 1: distributed feedback laser exports 1550nm laser, and the power of distributed feedback laser is 10dBm；
Step 2: the microwave signal of signal generator generation 10GHz；
Step 3: after phase modulator modulation, the microwave signal of 10GHz is modulated on 1550nm light carrier, and is imported
Full-fiber Mach-Zehnder interferometer；
Step 4: full-fiber Mach-Zehnder interferometer output light inputs photodetector；
Step 5: the microwave signal of the 10GHz of signal generator generation is measured with vector network analyzer analyzer and photoelectricity is visited
Survey the S of the microwave signal of device output21Parameter characteristic；
Step 6: S21The single comb frequency spectrum range at equal intervals of parameter is the free light of full-fiber Mach-Zehnder interferometer
Spectral limit.
6. the measurement method of full optical fiber interferometer Free Spectral Range measuring system, feature exist according to claim 5
In: in the step 1, the frequency and power of signal generator output microwave signal are continuously enlarged or reduce, selection is suitable
Microwave frequency and power, convenient for observation vector network analyzer S21Parameter.
7. the measurement method of full optical fiber interferometer Free Spectral Range measuring system, feature exist according to claim 5
In: the microwave of the step 5, the 10GHz that multiplicating measures signal generator generation with vector network analyzer analyzer is believed
Number and photodetector output microwave signal S21Then parameter characteristic is averaged.
8. the measurement method of full optical fiber interferometer Free Spectral Range measuring system, feature exist according to claim 5
In: in the step 6, multiple comb frequency spectrums at equal intervals are measured, are averaged, measures all -fiber Mach-Zehnder to improve
The measurement accuracy of interferometer Free Spectral Range.
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| CN201810985909.5A CN108955888B (en) | 2018-08-28 | 2018-08-28 | System and method for measuring free spectral range of all-fiber interferometer |
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|---|---|---|---|---|
| CN101762330A (en) * | 2009-12-30 | 2010-06-30 | 中国科学院半导体研究所 | Device and method for accurately measuring optical wavelength of single-mode infrared laser |
| CN104238229A (en) * | 2014-09-30 | 2014-12-24 | 金陵科技学院 | Mach-Zehnder fiber-optic interferometer tunable in free spectral range |
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| US20160248218A1 (en) * | 2016-04-08 | 2016-08-25 | Zibo Qi-red PhotoElectrical Technology Co., Ltd. | Optic-microwave frequency discriminator for laser frequency difference locking, and method thereof |
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| CN208621185U (en) * | 2018-08-28 | 2019-03-19 | 金陵科技学院 | A kind of full optical fiber interferometer Free Spectral Range measuring system |
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2018
- 2018-08-28 CN CN201810985909.5A patent/CN108955888B/en active Active
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| CN101762330A (en) * | 2009-12-30 | 2010-06-30 | 中国科学院半导体研究所 | Device and method for accurately measuring optical wavelength of single-mode infrared laser |
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