CN202662972U - Laser light source system with tunable output wavelength - Google Patents
Laser light source system with tunable output wavelength Download PDFInfo
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- CN202662972U CN202662972U CN 201220168757 CN201220168757U CN202662972U CN 202662972 U CN202662972 U CN 202662972U CN 201220168757 CN201220168757 CN 201220168757 CN 201220168757 U CN201220168757 U CN 201220168757U CN 202662972 U CN202662972 U CN 202662972U
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Abstract
The utility model provides a laser light source system with a tunable output wavelength, which is characterized by comprising a light path part and a control module, wherein the light path part comprises a laser light source, a light isolator, a band-pass filter, a tunable filter and a first light splitter which are sequentially connected; the output light of the first light splitter is split into two paths, one path is positively fed back to the laser light source, and the other path is output to a second light splitter; the output light of the second light splitter is split into two paths, one path is directly output, and the other path is output to an etalon for sampling the output light; the control module comprises a photovoltaic conversion module for performing photovoltaic conversion on the sampled output light, and a main controller for calculating the wavelength of the output light, and controlling the tunable filter; and the main controller is used for controlling the tunable filter via a triangular wave generation and drive module, and the input end of the photovoltaic conversion module is connected with the output end of the etalon.
Description
Technical field
The utility model relates to sensory field of optic fibre, is specially adapted on a large scale, the light source of the distributed real-time optical fiber grating sensor-based system of multiple spot.
Background technology
Optical fiber sensing technology is a hot technology that forms gradually along with the development of the appearance of optical fiber and optical fiber communication.It is take light as carrier, and optical fiber is transmission medium, and tested parameter is monitored.Compare with traditional electric sensor, have lightweight, corrosion-resistant, high temperature resistant, anti-electromagnetic interference does not produce the advantages such as electromagnetic interference yet.Fibre Optical Sensor collection sensing and be transmitted in one can realize multiplexed and distributed measurement in addition.
And the transducer take fiber grating as medium can rely on the variable quantity of grating bragg wavelength that different kinds of parameters is measured, and such as strain and temperature etc., therefore is widely used.But an output determines that the light source of wavelength and luminous power is the practical key of this transducer and difficult point, and its quality is determining the quality of light signal that whole system is sent.
The utility model content
The technical problems to be solved in the utility model is: provide a kind of output wavelength tunable laser source system for the deficiencies in the prior art.
The utility model is to solve the problems of the technologies described above the technical scheme of taking to be: the tunable laser source system of a kind of output wavelength is characterized in that: it comprises light path part and control module;
Light path part comprises LASER Light Source, optical isolator, band pass filter, tunable optic filter, the first optical branching device that connects in turn; The output light of the first optical branching device is divided into 2 tunnel, 1 tunnel positive feedback to LASER Light Source, the 1 tunnel exports to the second optical branching device in addition; The output light of the second optical branching device is divided into 2 the tunnel, the 1 tunnel directly to be exported, and 1 the tunnel exports to the etalon that light is exported in sampling in addition;
Control module comprise will sampling output light carry out the photoelectric conversion module of opto-electronic conversion, calculate output light wavelength and in order to control the master controller of described tunable optic filter; Master controller produces by triangular wave and driver module control tunable optic filter, and the input of photoelectric conversion module is connected with described etalon output.
Press such scheme, described master controller is connected with computer by serial ports.
Press such scheme, the output light of described the first optical branching device is divided into 10% and 90% two-way, and wherein 10% positive feedback is to LASER Light Source, and 90% exports to the second optical branching device.
Press such scheme, the output light of described the second optical branching device is divided into 50% and 50% two-way.
Press such scheme, it is 1310nm ± 25nm that described band pass filter is selected the logical wavelength of band.
Operation principle of the present utility model is: process and calculate the output light wavelength by the signal of telecommunication is sampled, is converted to output light, the output light wavelength is compared with the wavelength of setting, tunable optic filter is carried out suitable adjusting, to guarantee that output light is as needed light.
The beneficial effects of the utility model are:
1, carry out tuning by add tunable optic filter in light path part to output light, by output light is sampled also negative feedback to control module, the output light wavelength can be compared with the wavelength of setting and rear tunable optic filter be carried out suitable adjusting, to guarantee exporting light as needed light.
2, master controller is realized Long-distance Control by serial ports and compunication.
3, the output light of the first optical branching device is divided into 10% and 90% two-way, can guarantee in the situation of LASER Light Source normal operation, maximum possible do not affect output light.
4, the output light of the second optical branching device is divided into 50% and 50% two-way, so that as much as possible so that sampling is identical with output light.
Description of drawings
Fig. 1 is the utility model one embodiment control module theory diagram.
Fig. 2 is the utility model one embodiment light path part theory diagram.
Embodiment
Fig. 2 is the utility model one embodiment light path part theory diagram, and light path part comprises LASER Light Source, optical isolator, band pass filter, tunable optic filter, the first optical branching device that connects in turn; It is 10% light quantity that the output light of the first optical branching device is divided into 2 the tunnel, the 1 tunnel, and positive feedback is to LASER Light Source, and 1 the tunnel is 90% light quantity in addition, exports to the second optical branching device; The output light of the second optical branching device is divided into 2 tunnel each 50% light quantity, and 1 the tunnel directly exports, and 1 the tunnel exports to the etalon that light is exported in sampling in addition.The light of the output of optical branching device is rule of thumb value setting along separate routes, also can reset as required.
LASER Light Source is selected laser, is a kind of image intensifer that can directly amplify faint optical signal.When being biased electric current to device, electric current can make the semiconductor gain material produce population inversion, makes electronics transit to conduction band from valence band, thereby produces spontaneous radiation, when outer light field incident stimulated radiation can occur, and incident optical signal is amplified.
Optical isolator mainly based on the nonreciprocity of Faraday rotation, namely when the direction of propagation of light was opposite, do not reverse by plane of polarization anglec of rotation direction.The optical isolator effect mainly is to prevent in the light path because the harmful effect that the backward transmission light that a variety of causes produces produces light source and light path system.
If band pass filter utilizes the principle of optical interference, the wavelength of particular range can be passed through.It is 1310nm ± 25nm that present embodiment is selected the logical wavelength of band, also can select as required band logical wavelength, for example 1550nm ± 40nm of other types.
Tunable optic filter is a kind of wavelength selector spare, can select dynamically wavelength in certain light belt wide region.Its operation principle is to change the length in the Fabry that formed by fiber end face-Paro chamber by changing piezoelectric ceramic voltage, thereby reaches the purpose of wavelength Dynamic Selection.
Optical branching device (Optical Coupler) can be divided into two kinds of fused tapered and planar waveguide-types by principle.Present embodiment uses is that the fused tapered optical branching device is two or multifiber to be carried out the side welding form, and intercouples and changes the fine radius of optical fiber and realize different large subbranch amounts by changing evanescent field between optical fiber.
Etalon is Fabry-Perot etalon tool (Fabry-Perot Etalon), and the optics that it is made by a parallel plate glass two sides plated film carries out the wavelength screening based on multiple-beam interference principle.The wavelength interval O wave band of selecting is 2nm, and the C-band wavelength interval is 2.8nm.
Fig. 1 is the utility model one embodiment control module theory diagram, comprise will sampling output light carry out the photoelectric conversion module of opto-electronic conversion, calculate output light wavelength and in order to control the master controller of described tunable optic filter; Master controller produces by triangular wave and driver module control tunable optic filter, and the input of photoelectric conversion module is connected with described etalon output.Master controller is connected with computer by serial ports.
Master controller is single-chip microcomputer in the present embodiment, and it is used for controlling tunable optic filter and drives the signal generation, by RS232 serial ports and PC or single chip communication, to output optical signal sampling, analysis, finally confirms the output optical signal wavelength.It can communicate with the external control unit, export certain wavelength by the external control unit according to certain communication protocol notice one-chip computer module, also can self set wavelength, single chip control module is converted to voltage signal with this wavelength information, produce and driver module through triangular wave, this triangular signal has certain driving force, and this voltage is the certain voltage of tunable optic filter output.The part that photoelectric conversion module will be exported light is converted to the signal of telecommunication and feeds back to single-chip microcomputer, and single-chip microcomputer compares this voltage and setting voltage, thereby reaches degenerative effect, and then the purpose of control output wavelength and light intensity.
The inner integrated photodiode of photoelectric conversion module, this diode can be with the sub-fraction process opto-electronic conversion of output light, transfer the signal of telecommunication to, the amplitude of this signal of telecommunication and the intensity of output optical signal are proportional, and the frequency of this signal of telecommunication and the wavelength of output light-wave are proportional.Signal can be determined light intensity and the wavelength of output optical signal thus.
Claims (5)
1. tunable laser source system of output wavelength, it is characterized in that: it comprises light path part and control module;
Light path part comprises LASER Light Source, optical isolator, band pass filter, tunable optic filter, the first optical branching device that connects in turn; The output light of the first optical branching device is divided into 2 tunnel, 1 tunnel positive feedback to LASER Light Source, the 1 tunnel exports to the second optical branching device in addition; The output light of the second optical branching device is divided into 2 the tunnel, the 1 tunnel directly to be exported, and 1 the tunnel exports to the etalon that light is exported in sampling in addition;
Control module comprise will sampling output light carry out the photoelectric conversion module of opto-electronic conversion, calculate output light wavelength and in order to control the master controller of described tunable optic filter; Master controller produces by triangular wave and driver module control tunable optic filter, and the input of photoelectric conversion module is connected with described etalon output.
2. the tunable laser source system of output wavelength according to claim 1, it is characterized in that: described master controller is connected with computer by serial ports.
3. the tunable laser source system of output wavelength according to claim 1, it is characterized in that: the output light of described the first optical branching device is divided into 10% and 90% two-way, and wherein 10% positive feedback is to LASER Light Source, and 90% exports to the second optical branching device.
4. the tunable laser source system of output wavelength according to claim 1, it is characterized in that: the output light of described the second optical branching device is divided into 50% and 50% two-way.
5. the tunable laser source system of output wavelength according to claim 1 is characterized in that: it is 1310nm ± 25nm that described band pass filter is selected the logical wavelength of band.
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| CN 201220168757 CN202662972U (en) | 2012-04-20 | 2012-04-20 | Laser light source system with tunable output wavelength |
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| CN 201220168757 CN202662972U (en) | 2012-04-20 | 2012-04-20 | Laser light source system with tunable output wavelength |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103309058A (en) * | 2013-06-03 | 2013-09-18 | 武汉理工光科股份有限公司 | Nonlinear piezoelectric ceramic tunable wavelength filter correcting method and system |
| CN103634050A (en) * | 2013-11-28 | 2014-03-12 | 桂林聚联科技有限公司 | Device for improving stability of light source |
| CN103674287A (en) * | 2013-12-16 | 2014-03-26 | 中国电子科技集团公司第四十一研究所 | Laser wavelength monitoring device based on etalons |
| CN108011294A (en) * | 2017-12-30 | 2018-05-08 | 武汉理工光科股份有限公司 | Pulsed swept light source and production method based on semiconductor tunable laser |
-
2012
- 2012-04-20 CN CN 201220168757 patent/CN202662972U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103309058A (en) * | 2013-06-03 | 2013-09-18 | 武汉理工光科股份有限公司 | Nonlinear piezoelectric ceramic tunable wavelength filter correcting method and system |
| CN103309058B (en) * | 2013-06-03 | 2015-07-15 | 武汉理工光科股份有限公司 | Nonlinear piezoelectric ceramic tunable wavelength filter correcting method and system |
| CN103634050A (en) * | 2013-11-28 | 2014-03-12 | 桂林聚联科技有限公司 | Device for improving stability of light source |
| CN103674287A (en) * | 2013-12-16 | 2014-03-26 | 中国电子科技集团公司第四十一研究所 | Laser wavelength monitoring device based on etalons |
| CN103674287B (en) * | 2013-12-16 | 2016-06-22 | 中国电子科技集团公司第四十一研究所 | A kind of optical maser wavelength based on etalon monitors device |
| CN108011294A (en) * | 2017-12-30 | 2018-05-08 | 武汉理工光科股份有限公司 | Pulsed swept light source and production method based on semiconductor tunable laser |
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| C14 | Grant of patent or utility model | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130109 Termination date: 20180420 |
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| CF01 | Termination of patent right due to non-payment of annual fee |