CN105140777B - Width tunable semiconductor laser output wavelength control method and system - Google Patents
Width tunable semiconductor laser output wavelength control method and system Download PDFInfo
- Publication number
- CN105140777B CN105140777B CN201510575927.2A CN201510575927A CN105140777B CN 105140777 B CN105140777 B CN 105140777B CN 201510575927 A CN201510575927 A CN 201510575927A CN 105140777 B CN105140777 B CN 105140777B
- Authority
- CN
- China
- Prior art keywords
- wavelength
- semiconductor laser
- tunable
- scanning
- fiber grating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Semiconductor Lasers (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
The invention discloses a kind of width tunable semiconductor laser output wavelength control method and systems, wherein method is the following steps are included: control the Injection Current of semiconductor laser with tunable, and it controls semiconductor laser with tunable and carries out wavelength coarse scanning in full band range, and record each fiber grating reflection peak position；The Injection Current for controlling semiconductor laser with tunable carries out the scanning of wavelength essence around the fiber grating reflection peak position recorded；Identify simultaneously dynamically recording fiber grating reflection peak center；The Injection Current for controlling semiconductor laser with tunable carries out the scanning of wavelength essence around the fiber grating reflection peak center of dynamically recording.The high-precision demodulation of optic fiber grating wavelength may be implemented in the present invention, while the sweep speed of high speed may be implemented.
Description
Technical field
The present invention relates to sensory field of optic fibre, more particularly to a kind of width tunable semiconductor laser output wavelength controlling party
Method and system.
Background technique
Fiber grating sensing technology with passive, electromagnetism interference, it is corrosion-resistant, the service life is long the advantages that, in bridge, storage tank, friendship
The multiple fields such as logical tunnel, national defence, aerospace are widely used.Wavelength demodulation in relation to fiber-optic grating sensor is always
It is the emphasis of research institution and enterprise development and the core of fiber grating sensing technology.It is more representative, obtain simultaneously
It is widely applied mainly to have " broad spectrum light source+spectra methods " and " Wavelength tunable light source " two class.The former is to utilize CCD
Or the detector arrays such as CMOS acquisition spectral signal is analyzed；The latter is to be swept using light source to a certain range of wavelength
It retouches, obtain the reflected optical power of fiber grating and is analyzed.
Due to the continuous development of optic tunable filter and Wavelength tunable light source technology, wavelength tuning range is
It is identical as broad spectrum light source, while in terms of multi-channel synchronous Wavelength demodulation, have than " broad spectrum light source+spectra methods " excellent
Gesture, therefore it is increasingly becoming mainstream.
But " Wavelength tunable light source " is also defective, as patent CN201210222826, CN200810017245,
CN200610124955.3 etc. is all made of a large amount of discrete optical elements, such as optic tunable filter, Wavelength calibration device, causes
Product reliability, size etc. are not fully up to expectations；And the program can not be with " broad spectrum light source+spectrum in Wavelength demodulation speed
Analytic approach " compares favourably.
In patent CN200610109382, using thermal tuning method, change distribution bragg feedback semiconductor laser
(DFB) output wavelength realizes optic fiber grating wavelength demodulation.But one side thermal tuning method speed is slower, on the other hand,
The output wavelength tuning range of DFB is very narrow, usually 5nm, its load number is caused to be greatly reduced.
In recent years, it in optical communication industry, is constantly sent out using the width tunable semiconductor laser of optical waveguide integrated technique
Exhibition, such as single-chip integration, the width tunable semiconductor laser of US4896325A and CN201210244941.The laser uses
Numerous optical elements are integrated on single semiconductor waveguide material by optical waveguide integrated technique, and wavelength tuning is to pass through control
What the electric current of different passive waveguide regions was realized, i.e., list, control are inquired in typing " electric current --- wavelength " in the controller in advance
Device processed injects corresponding electric current according to the needs of output wavelength.The device not only greatly reduces device size, also improves simultaneously
The reliability of product.These devices start to widely apply in optical communication wavelength-division multiplex system, while many manufacturers also will
The device is introduced into optical fiber grating sensing field.But this tunable laser is in the communications field, and output wavelength only needs pair
Quasi- ITU-T wavelength, does not have wavelength sweep rate requirement.But in sensory field, then require laser close in full band range
Collection ground length scanning, improves optic fiber grating wavelength demodulation accuracy；Quick wavelength sweep rate is also needed simultaneously, for vibrating
The needs of the high speed measurement such as sensor, therefore the two requires to condition each other.
Summary of the invention
The present invention is not high for wavelength sweep rate in the prior art, is not able to satisfy the defect of demand of high speed measuring, provides
A kind of high-precision demodulation of wavelength, while the width tunable semiconductor laser output wavelength of the sweep speed of high speed may be implemented
Control method and system.
The technical solution adopted by the present invention to solve the technical problems is:
A kind of width tunable semiconductor laser output wavelength control method is provided, comprising the following steps:
S1, the Injection Current for controlling semiconductor laser with tunable, and semiconductor laser with tunable is controlled in all band
Wavelength coarse scanning is carried out in range, and records each fiber grating reflection peak position；
S2, the Injection Current for controlling semiconductor laser with tunable, the reflection of the fiber grating recorded in step S1
Peak position carries out the scanning of wavelength essence；
S3, identification and dynamically recording fiber grating reflection peak center；
S4, the Injection Current for controlling semiconductor laser with tunable, the fiber grating of dynamically recording is anti-in step S3
It penetrates peak center position and carries out the scanning of wavelength essence.
In method of the present invention, further comprise the steps of:
S5, within period regular hour, control semiconductor laser wavelength coarse scanning is carried out in all band, judge light
Fine optical grating reflection peak number amount and its position, to prevent new fiber-optic grating sensor from increasing.
In method of the present invention, in step S1, control semiconductor laser with tunable carries out wave within the scope of 40nm
Long coarse scanning.
In method of the present invention, it is left and right each that step S2 and step S4 surround fiber grating reflection peak center
100pm carries out the scanning of wavelength essence according to stepping 1pm.
In method of the present invention, the semiconductor laser with tunable is followed successively by preceding grating region, active from front to back
Area, phase region and rear grating region, output wavelength are real by the Injection Current for controlling preceding grating region, phase region and rear grating region
Existing, different currents combinations realizes different output wavelengths, therefore further comprises the steps of: before step S1
Measurement semiconductor laser with tunable difference currents combination and output wavelength in advance, forms inquiry list, when work,
According to the corresponding Injection Current of required wavelength selection.
The present invention also provides a kind of width tunable semiconductor laser output wavelength control system, the system and tunable half
Conductor laser connection, the system include:
Coarse scanning unit for controlling the Injection Current of semiconductor laser with tunable, and controls tunable semiconductor and swashs
Light device carries out wavelength coarse scanning in full band range, and records each fiber grating reflection peak position；
Smart scanning element is remembered in coarse scanning unit for controlling the Injection Current of semiconductor laser with tunable
The fiber grating reflection peak position of record carries out the scanning of wavelength essence；
Recognition unit, for identification and dynamically recording fiber grating reflection peak center；
The essence scanning element is also used to control the Injection Current of semiconductor laser with tunable, the dynamic in recognition unit
The fiber grating reflection peak center of record carries out the scanning of wavelength essence.
In system of the present invention, the coarse scanning system was also used within period regular hour, controlled semiconductor
Laser carries out wavelength coarse scanning in all band, judges fiber grating reflection peak quantity and its position, to prevent new optical fiber
Grating sensor increases.
In system of the present invention, the coarse scanning unit is specifically used for control semiconductor laser with tunable in 40nm
Wavelength coarse scanning is carried out in range.
In system of the present invention, the essence scanning is left and right each around fiber grating reflection peak center
100pm carries out the scanning of wavelength essence according to stepping 1pm.
In system of the present invention, the semiconductor laser with tunable connecting with the system is followed successively by preceding light from front to back
Grid region, active area, phase region and rear grating region, output wavelength pass through the preceding grating region of control, the note of phase region and rear grating region
Enter electric current realization, different currents combinations realizes different output wavelengths, therefore the system further include:
List cell is inquired, for measuring semiconductor laser with tunable difference currents combination and output wavelength, shape in advance
At inquiry list, when work, according to the corresponding Injection Current of required wavelength selection.
The beneficial effect comprise that: the present invention is directed to the actual features of fiber grating sensing technology, i.e., each biography
There are certain wavelength interval between sensor, by the improvement to width tunable semiconductor laser output wavelength control method,
It is scanned only around fiber grating reflection peak near center location, while guaranteeing Wavelength demodulation precision, reduces each anti-
Length scanning invalid between peak is penetrated, scanning speed is improved, the restricting relation solved between scanning accuracy and scanning speed is difficult
Topic.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples, in attached drawing:
Fig. 1 is Fiber Bragg Grating Sensor Array Wavelength distribution schematic diagram；
Fig. 2 is width tunable semiconductor laser of embodiment of the present invention output wavelength control method flow chart；
Fig. 3 is the structural schematic diagram of semiconductor laser with tunable in the embodiment of the present invention；
Fig. 4 is laser " current-wavelength " inquiry table example in embodiment；
Fig. 5 is width tunable semiconductor laser of embodiment of the present invention output wavelength control system architecture schematic diagram.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that described herein, specific examples are only used to explain the present invention, not
For limiting the present invention.
Starting point of the invention is in actual Fiber Bragg Grating Sensor Array that each fiber-optic grating sensor exists
Certain wavelength interval, as shown in Figure 1.This is because fiber grating is influenced by temperature or stress, reflection peak wavelength can be sent out
Raw to change, to avoid two fiber gratings from reflecting overlap of peaks, in practical application, the wavelength interval of two sensors is far.That is wave
Long demodulation range only needs the position near fiber grating reflection peak, and the big portion between two fiber grating reflection peaks
Point range is invalid region, does not have any influence to Wavelength demodulation.
The embodiment of the present invention uses new tunable laser wavelength control method, only in fiber grating reflection peak near zone
Carry out length scanning.
As shown in Fig. 2, the width tunable semiconductor laser output wavelength control method of the embodiment of the present invention includes following
Step:
S1, the Injection Current for controlling semiconductor laser with tunable, and width tunable semiconductor laser is controlled in all-wave
Carry out wavelength coarse scanning in segment limit, which is not involved in Wavelength demodulation, main purpose be to identify fiber grating quantity and its
Locating substantially wavelength location, laser output wavelength interval can be very big at this time.
S2, control laser Injection Current, only around in fiber grating reflection peak near center location a certain range into
Row essence is swept the second, and Wavelength demodulation precision is improved.
S3, identification and dynamically recording fiber grating reflection peak center.Because of the center meeting of fiber grating reflection peak
It changes with its measurement parameters (such as temperature, strain), so needing dynamically recording fiber grating reflection peak center.
S4, around new fiber grating reflection peak near center location, carry out the scanning of wavelength essence according to the method for step S2.
In one embodiment of the present of invention, the case where increase and decrease if there is fiber-optic grating sensor dynamic, then need to carry out
Step S5, within period regular hour, control width tunable semiconductor laser carries out wavelength coarse scanning in all band, sentences
Disconnected fiber grating reflection peak quantity and its position, that is, return step S1.
In one embodiment of the present of invention, by taking sampled grating distributed bragg reflector lasers (SGDBR) as an example.The laser
For device as shown in figure 3, being followed successively by preceding grating region, active area, phase region and rear grating region from front to back, output wavelength is to pass through control
Make what the Injection Current of preceding grating region, phase region and rear grating region was realized, i.e., different currents combinations may be implemented different defeated
Wavelength out.The laser measures different currents combinations and output wavelength in advance, then forms inquiry list, as shown in Figure 4.Work
When according to the corresponding Injection Current of required wavelength selection.
Conventional method is by SGDBR laser application when optic fiber grating wavelength demodulates, it is assumed that wavelength scanning range 40nm,
For the demodulation accuracy for realizing 1pm, the point-by-point output wavelength of laser 40000 times are needed.Counting each wavelength output time is t, then always
Count time-consuming 40,000*t.
Method of the invention is then are as follows:
The first step, control SGDBR carry out wavelength coarse scan within the scope of 40nm, due to not needing Wavelength demodulation at this time, mainly
Purpose is identification fiber grating quantity and its locating substantially wavelength location, and laser output wavelength interval can be very at this time
Greatly.Consider that fiber grating three dB bandwidth is usually 200pm, stepping 100pm can identify fiber grating completely, therefore consume at this time
When 400*t.Each fiber grating reflection peak position is recorded simultaneously.
Second step controls the Injection Current of laser, only around the fiber grating that is recorded in the first step reflect peak position into
Row essence is swept.Such as have 10 fiber gratings, length scanning is carried out according to stepping 1pm around the left and right each 100pm in center, this
When time-consuming 2000t, compared with conventional method promoted 20 times.
Third step, because fiber grating reflection peak center can change with its measurement parameters (such as temperature, strain)
Become, so needing the result dynamically recording fiber grating reflection peak center according to second step.
4th step, the new fiber grating reflection peak near center location in third step, according to second step the method
Carry out length scanning.
5th step, within period regular hour, control width tunable semiconductor laser carries out wavelength in all band
Coarse scanning judges fiber grating reflection peak quantity and its position.
5th step is option, it is intended to prevent the case where fiber-optic grating sensor dynamic increases and decreases.If testing
The quantity of Cheng Zhong, fiber grating remain unchanged, then the step can be omitted.
Width tunable semiconductor laser output wavelength control system of the embodiment of the present invention is for realizing above-described embodiment
Wavelength control method, as shown in figure 5, the system is connect with semiconductor laser with tunable, which includes:
Coarse scanning unit for controlling the Injection Current of semiconductor laser with tunable, and controls tunable semiconductor and swashs
Light device carries out wavelength coarse scanning in full band range, and records each fiber grating reflection peak position；
Smart scanning element controls the Injection Current of semiconductor laser with tunable, recorded in coarse scanning unit
Fiber grating reflects peak position and carries out the scanning of wavelength essence, and dynamically recording fiber grating reflection peak center；
The essence scanning element is also used to control the Injection Current of semiconductor laser with tunable, around the optical fiber of dynamically recording
Optical grating reflection peak center position carries out the scanning of wavelength essence.
Wherein, the coarse scanning system was also used within period regular hour, controlled semiconductor laser in all band
Interior progress wavelength coarse scanning, judges fiber grating reflection peak quantity and its position, to prevent new fiber-optic grating sensor from increasing.
In one embodiment of the present of invention, the coarse scanning unit is specifically used for control semiconductor laser with tunable and exists
Wavelength coarse scanning is carried out within the scope of 40nm.
The essence scanning surrounds the left and right each 100pm in fiber grating reflection peak center, carries out wave according to stepping 1pm
Long essence scanning.
In the embodiment, the semiconductor laser with tunable connecting with the system is followed successively by preceding grating region from front to back, has
Source region, phase region and rear grating region, output wavelength are real by the Injection Current for controlling preceding grating region, phase region and rear grating region
Existing, different currents combinations realizes different output wavelengths, therefore the system further include:
List cell is inquired, for measuring semiconductor laser with tunable difference currents combination and output wavelength, shape in advance
At inquiry list, when work, according to the corresponding Injection Current of required wavelength selection.
To sum up, optical fiber may be implemented by the way that wavelength coarse scanning and the scanning of wavelength essence to be effectively bonded together in the present invention
The high-precision of grating wavelength demodulates, while the sweep speed of high speed may be implemented.
It should be understood that for those of ordinary skills, it can be modified or changed according to the above description,
And all these modifications and variations should all belong to the protection domain of appended claims of the present invention.
Claims (10)
1. a kind of width tunable semiconductor laser output wavelength control method, which comprises the following steps:
S1, the Injection Current for controlling semiconductor laser with tunable, and semiconductor laser with tunable is controlled in full band range
Interior progress wavelength coarse scanning, and record each fiber grating reflection peak position；
S2, the Injection Current for controlling semiconductor laser with tunable, the fiber grating recorded in step S1 reflect peak position
It sets and carries out the scanning of wavelength essence；
S3, identification and dynamically recording fiber grating reflection peak center；
S4, the Injection Current for controlling semiconductor laser with tunable, the fiber grating reflection peak of dynamically recording in step S3
Center carries out the scanning of wavelength essence.
2. the method according to claim 1, wherein further comprising the steps of:
S5, within period regular hour, control semiconductor laser wavelength coarse scanning is carried out in all band, judge optical fiber light
Grid reflection peak quantity and its position, to prevent new fiber-optic grating sensor from increasing.
3. the method according to claim 1, wherein control semiconductor laser with tunable exists in step S1
Wavelength coarse scanning is carried out within the scope of 40nm.
4. the method according to claim 1, wherein step S2 and step S4 are surrounded in fiber grating reflection peak
The left and right each 100pm in heart position carries out the scanning of wavelength essence according to stepping 1pm.
5. the method according to claim 1, wherein the semiconductor laser with tunable is followed successively by from front to back
Preceding grating region, active area, phase region and rear grating region, output wavelength is by controlling preceding grating region, phase region and rear grating region
Injection Current realize, different currents combinations realizes different output wavelengths, therefore further comprises the steps of: before step S1
Measurement semiconductor laser with tunable difference currents combination and output wavelength in advance, forms inquiry list, when work, according to
The required corresponding Injection Current of wavelength selection.
6. a kind of width tunable semiconductor laser output wavelength control system, which is characterized in that the system is partly led with tunable
Body laser connection, the system include:
Coarse scanning unit for controlling the Injection Current of semiconductor laser with tunable, and controls semiconductor laser with tunable
Wavelength coarse scanning is carried out in full band range, and records each fiber grating reflection peak position；
Smart scanning element, for controlling the Injection Current of semiconductor laser with tunable, recorded in coarse scanning unit
Fiber grating reflects peak position and carries out the scanning of wavelength essence；
Recognition unit, for identification and dynamically recording fiber grating reflection peak center；
The essence scanning element is also used to control the Injection Current of semiconductor laser with tunable, around dynamically recording in recognition unit
Fiber grating reflection peak center carry out the scanning of wavelength essence.
7. system according to claim 6, which is characterized in that the coarse scanning system was also used in period regular hour
Interior, control semiconductor laser carries out wavelength coarse scanning in all band, judges fiber grating reflection peak quantity and its position, with
Prevent new fiber-optic grating sensor from increasing.
8. system according to claim 6, which is characterized in that the coarse scanning unit is partly led specifically for control is tunable
Body laser carries out wavelength coarse scanning within the scope of 40nm.
9. system according to claim 6, which is characterized in that the essence scanning surrounds fiber grating reflection peak centre bit
Left and right each 100pm is set, carries out the scanning of wavelength essence according to stepping 1pm.
10. system according to claim 6, which is characterized in that the semiconductor laser with tunable being connect with the system from
Front to back is followed successively by preceding grating region, active area, phase region and rear grating region, and output wavelength is by controlling preceding grating region, phase
The Injection Current of area and rear grating region realizes that different currents combinations realizes different output wavelengths, therefore the system further include:
List cell is inquired, is looked into for measurement semiconductor laser with tunable difference currents combination and output wavelength, formation in advance
List is ask, when work, according to the corresponding Injection Current of required wavelength selection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510575927.2A CN105140777B (en) | 2015-09-11 | 2015-09-11 | Width tunable semiconductor laser output wavelength control method and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510575927.2A CN105140777B (en) | 2015-09-11 | 2015-09-11 | Width tunable semiconductor laser output wavelength control method and system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105140777A CN105140777A (en) | 2015-12-09 |
| CN105140777B true CN105140777B (en) | 2019-07-23 |
Family
ID=54726040
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510575927.2A Active CN105140777B (en) | 2015-09-11 | 2015-09-11 | Width tunable semiconductor laser output wavelength control method and system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105140777B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106767937B (en) * | 2016-11-29 | 2019-06-28 | 武汉理工光科股份有限公司 | The real-time correcting method of tuner-type optic fiber grating wavelength (FBG) demodulator |
| KR102597283B1 (en) | 2017-05-22 | 2023-11-01 | 브로리스 센서 테크놀로지, 유에이비 | Tunable hybrid III-V/IV laser sensor system-on-chip for real-time monitoring of blood component concentration levels |
| JP7162066B2 (en) | 2018-02-02 | 2022-10-27 | ブロリス センサー テクノロジー，ユーエイビー | Wavelength determination of broadband tunable laser and its laser system |
| CN112186502A (en) * | 2020-09-30 | 2021-01-05 | 武汉光迅科技股份有限公司 | Narrow-linewidth semiconductor external cavity laser and manufacturing method thereof |
| CN113108696A (en) * | 2021-04-06 | 2021-07-13 | 合肥埃科光电科技有限公司 | Light source wavelength scanning spectrum confocal sensor |
| CN114034468B (en) * | 2021-11-04 | 2023-10-17 | 宁波元芯光电子科技有限公司 | Wavelength calibration method of multichannel interference laser |
| CN117578172A (en) * | 2024-01-17 | 2024-02-20 | 山东中芯光电科技有限公司 | Wavelength expansion method and system based on DBR laser |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101227061A (en) * | 2007-12-28 | 2008-07-23 | 武汉光迅科技股份有限公司 | Manufacturing method of tunable semiconductor laser and tunable semiconductor laser |
| CN101975594A (en) * | 2010-10-08 | 2011-02-16 | 武汉理工光科股份有限公司 | Distributed realtime fiber bragg grating wavelength demodulating system and method |
| CN102279044A (en) * | 2011-05-03 | 2011-12-14 | 北京理工大学 | Method for automatically collimating hydrophone in ultrasonic sound filed measurement |
| CN203100750U (en) * | 2012-12-14 | 2013-07-31 | 张丽 | Fiber grating demodulation instrument base on digitalized tunable light source |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102889903A (en) * | 2011-07-21 | 2013-01-23 | 桂林优西科学仪器有限责任公司 | OFS (optical fiber sensor) measuring system for tunable laser sources and application method thereof |
-
2015
- 2015-09-11 CN CN201510575927.2A patent/CN105140777B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101227061A (en) * | 2007-12-28 | 2008-07-23 | 武汉光迅科技股份有限公司 | Manufacturing method of tunable semiconductor laser and tunable semiconductor laser |
| CN101975594A (en) * | 2010-10-08 | 2011-02-16 | 武汉理工光科股份有限公司 | Distributed realtime fiber bragg grating wavelength demodulating system and method |
| CN102279044A (en) * | 2011-05-03 | 2011-12-14 | 北京理工大学 | Method for automatically collimating hydrophone in ultrasonic sound filed measurement |
| CN203100750U (en) * | 2012-12-14 | 2013-07-31 | 张丽 | Fiber grating demodulation instrument base on digitalized tunable light source |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105140777A (en) | 2015-12-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105140777B (en) | Width tunable semiconductor laser output wavelength control method and system | |
| CN105136178B (en) | The distribution type optical fiber sensing equipment and method of the relevant domain analysis of chaos Brillouin light | |
| CN103338068B (en) | A kind of point photo detector based on multi-channel parallel light signal | |
| CN107065619B (en) | A kind of the wavelength control electrode parameter setting method and device of tunable laser | |
| CN107727365B (en) | A kind of system using reflectance spectrum fineness measurement optical waveguide loss | |
| CN103196473A (en) | Demodulating device of multi-channel high-precision fiber grating sensing and demodulating method thereof | |
| CN102829806A (en) | Optical fiber sensing system based on phase-shifted optical fiber grating | |
| CN106802186B (en) | The intelligent narrow-band-filter system of optical filtering is followed based on acousto-optic modulation optical maser wavelength | |
| CN101975594A (en) | Distributed realtime fiber bragg grating wavelength demodulating system and method | |
| CN105698831B (en) | Twin-core fiber grating array sensing network and distributed sensing information acquisition method | |
| CN109813961A (en) | Microwave instantaneous frequency measurement device based on optical frequency com | |
| CN107462776A (en) | Integrated light guide electric field measurement system and its measuring method based on wavelength control | |
| CN105136179A (en) | Distributed optical fiber sensing device based on ASE noise coherent detection and method | |
| CN105806374B (en) | A kind of demodulation method of optic fiber grating wavelength | |
| TWI234668B (en) | Fiber Bragg grating sensing system of light intensity and wave-divided multiplex | |
| CA3023766A1 (en) | A fiber optic interrogation system for multiple distributed sensing systems | |
| CN102928076B (en) | Laser real-time power monitoring device and monitoring method free from influence of polarization degree | |
| CN107356275A (en) | A kind of method that spectral resolution is improved in optical frequency domain reflection-based optical fiber distributed sensing | |
| CN106530559B (en) | The more defence area optical fiber perimeters of tandem invade sensor-based system | |
| CN105739029A (en) | Tunable optical filter of TO package | |
| CN108037096A (en) | A kind of spectrum detection device and detection method for phase-modulation laser pulse | |
| CN104880208B (en) | A kind of optical wavelength detector, optical wavelength detection system and method | |
| CN106404015A (en) | High-speed high-precision multichannel Bragg grating demodulation instrument | |
| CN206540629U (en) | The intelligent narrow-band-filter system of optical filtering is followed based on acousto-optic modulation optical maser wavelength | |
| CN105783955B (en) | The adjustable distributed optical fiber sensing system of sensitivity based on high-order stokes wave |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |