CN206894002U - Frequency stabilization of semiconductor laser system based on cascade fiber grating - Google Patents

Frequency stabilization of semiconductor laser system based on cascade fiber grating Download PDF

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Publication number
CN206894002U
CN206894002U CN201720556219.9U CN201720556219U CN206894002U CN 206894002 U CN206894002 U CN 206894002U CN 201720556219 U CN201720556219 U CN 201720556219U CN 206894002 U CN206894002 U CN 206894002U
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semiconductor laser
frequency stabilization
input
cascade
fiber grating
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杨旻蔚
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SHANGHAI B&A INDUSTRIAL Co Ltd
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SHANGHAI B&A INDUSTRIAL Co Ltd
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Abstract

It the utility model is related to a kind of frequency stabilization of semiconductor laser system based on cascade fiber grating, including semiconductor laser, isolator, coupler, circulator, cascade fiber grating, transmission light-receiving PIN, reflection light-receiving PIN and frequency stabilization circuit.Using the frequency stabilization of semiconductor laser system based on cascade fiber grating, by the cascade FBG of G.652 optical fiber fabrication, have manufacturing technology ripe simple, manufacturing price is cheap, it is adapted to large-scale production, is easy to same fibre system coupling and size is smaller, be easy to the advantages such as construction packages；Using the light path of all -fiber form, the difficulty in free space light path mounting structure complexity and adjustment is avoided, while reduces economy and time cost in production；To form ratio using detecting transmitted light intensity and reflective light intensity simultaneously and being divided by and relock to by the way of reference value, improve the signal to noise ratio of frequency discrimination signal and sensitive, eliminate the noise in traditional frequency stabilization scheme, there is extensive reference scope.

Description

Frequency stabilization of semiconductor laser system based on cascade fiber grating
Technical field
Technical field of optical fiber communication, more particularly to frequency stabilization of semiconductor laser technical field are the utility model is related to, specifically Refer to a kind of frequency stabilization of semiconductor laser system based on cascade fiber grating.
Background technology
1550nm wave bands Semiconductor DFB (Distributed Feed Back, distributed feed-back) laser is due to relative maturity Manufacturing process, cheap price and good performance have wide application in the field such as fiber optic communication and Fibre Optical Sensor Scope.Wherein, laser monochromaticjty in itself and coherence directly affect the performance and antijamming capability of reception signal, and this will Ask laser to realize single-frequency output as far as possible, and the stabilization of output frequency can be realized, so as to introduce laser This problem of device Frequency Stabilization Technique.
Currently used frequency stabilization of semiconductor laser method is to be based on optical method amber (FP) etalon, passes through a series of vibration isolation After temperature control and packaging technology, turn into a stable reference frequency standard.However, can be as the FP standards of frequency reference Tool, not only manufacturing process complexity cost itself is higher, and belongs to free space optical elements, and separate optical element is more, light Road adjustment is more difficult, thus is generally only applied in the higher scientific research field of accuracy and index request, it is difficult to adapts to industry Change the requirement of large-scale production.
In recent years, foreign countries propose one kind using phase shift FBG (Fiber Bragg Grating, fiber grating) as narrow Scheme with frequency reference source, the program is made using more ripe FBG and packaging technology, and easy with optical fiber telecommunications system In the advantage of coupling, the commercialization 1550nm wave band semiconductor lasers based on offset frequency difference locking frequency stabilization scheme are successfully proposed Product.However, phase shift FBG making needs to use special phase mask plate, price FBG conventional compared to making mask plate is more For costliness and it is difficult to make.
Compared to aforementioned schemes, this programme uses cascade FBG not only equally to inherit optical fiber device as reference frequency element Application advantage of the part in fibre system；And phase shift FBG is compared, the simple cost of manufacture craft is relatively low.In addition, change in this programme Become traditional detection light and reference light difference obtains the mode of error signal, but use transmitted light intensity and reflective light intensity ratio value Fluctuation between preset reference value can not only improve the signal to noise ratio of frequency stabilization as error signal, simultaneously for laser from The antijamming capability of body changes in amplitude is stronger.By postponing self-heterodyne method, can test before and after frequency stabilization of semiconductor laser Line width, so as to the frequency stabilization ability of proof scheme.
Utility model content
The purpose of this utility model is the shortcomings that overcoming above-mentioned prior art, there is provided one kind can realize that enhancing is partly led The frequency stability of body laser, simplify manufacturing process and reduce cost the semiconductor laser based on cascade fiber grating it is steady Display system.
To achieve these goals, the utility model has following form：
The frequency stabilization of semiconductor laser system based on cascade fiber grating, including semiconductor laser, isolator, coupling Device, circulator, cascade fiber grating, transmission light-receiving PIN, reflection light-receiving PIN, transmission signal operational amplifier, reflection letter Number operational amplifier and frequency stabilization circuit, the output end of described semiconductor laser are connected with the input of described isolator Connect, the output end of described isolator is connected with the input of described coupler, the detection light output of described coupler End is connected with the first end of described circulator, the second end of described circulator and the input of described cascade fiber grating End is connected, and the 3rd end of described circulator is connected with described reflection light-receiving PIN input, described cascade light The output end of fine grating is connected with described transmission light-receiving PIN input, described transmission light-receiving PIN output end Be connected with the input of described transmission signal operational amplifier, described reflection light-receiving PIN output end with it is described The input of reflected signal operational amplifier is connected, the output end of described transmission signal operational amplifier and described reflection Input of the output end of signal operation amplifier with described frequency stabilization circuit is connected, the output end of described frequency stabilization circuit It is connected with the input of described semiconductor laser.
It is preferred that described semiconductor laser is semiconductor DFB and exported with fiber coupling.
It is preferred that described isolator is fibre optic isolater, the input and output of described fibre optic isolater are optical fiber Coupling, and the dual-port with steel pipe encapsulation or glass-encapsulated.
It is preferred that described coupler is fiber coupler, the input and output of described fiber coupler are optical fiber Coupling, and three ports with steel pipe encapsulation or glass-encapsulated.
It is preferred that described circulator is optical fiber circulator, the input and output of described optical fiber circulator are optical fiber Coupling, and three ports with steel pipe encapsulation or glass-encapsulated.
It is preferred that described cascade fiber grating includes one pre-determined distance of interval and is successively arranged at more on single-mode fiber Individual identical fiber grating.
It is preferred that one in described transmission light-receiving PIN and described reflection light-receiving PIN is detection transmitted light intensity Photodetector, another for detection reflective light intensity photodetector.
It is preferred that described cascade fiber grating, by way of pretension, dispensing is fixed in U-type groove, described is U-shaped Temperature control chip is fixedly arranged on by dispensing mode after groove, transmission light-receiving PIN, reflection light-receiving PIN and thermistor encapsulation, Described thermistor, described temperature control chip, described transmission light-receiving PIN and described reflection light-receiving PIN leads to Cross fly line to connect with stitch, and sealed after full of inert gas, optical fiber and the junction of stitch and housing are carried out by dispensing Seal and fixed.
It is preferred that described frequency stabilization circuit includes comparator and reversed feedback amplifier, the proportional level of described comparator Input is connected with described transmission light-receiving PIN output end and described reflection light-receiving PIN output end respectively, institute The output end for the comparator stated is connected with the input of described reversed feedback amplifier, the output end of described feedback amplifier It is connected with the input of described semiconductor laser.
The frequency stabilization of semiconductor laser system based on cascade fiber grating in the utility model is employed, is had with following Beneficial effect：
1st, using the cascade FBG by G.652 optical fiber fabrication, have manufacturing technology ripe simple, manufacturing price is cheap, is adapted to Large-scale production, is easy to same fibre system coupling and size is smaller, is easy to the advantages such as construction packages.
2nd, using the light path of all -fiber form, avoid that free space light path mounting structure is complicated and adjustment on it is tired Difficulty, while reduce economy and time cost in production.
3rd, to form ratio and relock to by the way of reference value using detecting transmitted light intensity and reflective light intensity simultaneously and be divided by, carry The signal to noise ratio of frequency discrimination signal and sensitive has been risen, traditional frequency stabilization scheme has been eliminated and uses detection light and reference light difference rrequency-offset-lock In mode, due to the inaccurate caused noise in laser power swing itself and offset frequency position.
Brief description of the drawings
Fig. 1 is the schematic diagram of cascade fiber grating of the present utility model.
Fig. 2 is the transmittance graph of cascade fiber grating of the present utility model and the schematic diagram of reflectance curve.
Fig. 3 is the fiber grating and light of the frequency stabilization of semiconductor laser system of the present utility model based on cascade fiber grating The schematic diagram of the encapsulating structure of electric explorer.
Fig. 4 is that the frequency stabilization principle of the frequency stabilization of semiconductor laser system of the present utility model based on cascade fiber grating is illustrated Figure.
Fig. 5 is laser before and after the frequency stabilization of the frequency stabilization of semiconductor laser system of the present utility model based on cascade fiber grating The comparison schematic diagram of device line width test curve effect.
Description of reference numerals：
1-transmission light-receiving PIN
2-reflection light-receiving PIN
3-thermistor
4-U-type groove
5-cascade FBG
6-temperature control chip
7-tail optical fiber
8-housing
9-external pin
10-semiconductor laser
11-fibre optic isolater
12-fiber coupler
13-optical fiber circulator
The cascade FBG modules of 14-encapsulation
15-transmission signal operational amplifier
16-reflected signal operational amplifier
17-analog divider
18-default datum
19-proportional integral circuit
20-reversed feedback amplifier
Embodiment
In order to more clearly describe technology contents of the present utility model, enter traveling one with reference to specific embodiment The description of step.
In a kind of specific embodiment, the frequency stabilization of semiconductor laser system based on cascade fiber grating is somebody's turn to do, including Semiconductor laser, isolator, coupler, circulator, cascade fiber grating, transmission light-receiving PIN, reflection light-receiving PIN, thoroughly Penetrate signal operation amplifier 15, reflected signal operational amplifier 16 and frequency stabilization circuit, the output end of described semiconductor laser It is connected with the input of described isolator, the output end of described isolator is connected with the input of described coupler Connecing, the detection light output end of described coupler is connected with the first end of described circulator, and the second of described circulator End is connected with the input of described cascade fiber grating, the 3rd end of described circulator and described reflection light-receiving PIN input is connected, and the output end of described cascade fiber grating is connected with described transmission light-receiving PIN input Connect, described transmission light-receiving PIN output end is connected with the input of described transmission signal operational amplifier 15, described Reflection light-receiving PIN output end be connected with the input of described reflected signal operational amplifier 16, described transmission The output end of signal operation amplifier 15 and the output end of described reflected signal operational amplifier 16 are electric with described frequency stabilization The input on road is connected, and the output end of described frequency stabilization circuit is connected with the input of described semiconductor laser.
In a kind of preferably embodiment, described semiconductor laser 10 is semiconductor DFB and has light Fibre coupling output.
A kind of preferably in embodiment, described isolator is fibre optic isolater 11, described fibre optic isolater 11 Input and output be fiber coupling, and with steel pipe encapsulation or glass-encapsulated dual-port.
A kind of preferably in embodiment, described coupler is fiber coupler 12, described fiber coupler 12 Input and output be fiber coupling, and with steel pipe encapsulation or glass-encapsulated three ports.
A kind of preferably in embodiment, described circulator is optical fiber circulator 13, described optical fiber circulator 13 Input and output be fiber coupling, and with steel pipe encapsulation or glass-encapsulated three ports.
In a kind of preferably embodiment, described cascade fiber grating includes one pre-determined distance of interval and successively set In multiple identical fiber gratings on single-mode fiber.
In a kind of preferably embodiment, in described transmission light-receiving PIN1 and described reflection light-receiving PIN2 One photodetector for detection transmitted light intensity, another is the photodetector of detection reflective light intensity.
In a kind of preferably embodiment, for described cascade fiber grating by way of pretension, U is fixed in dispensing In type groove 4, described U-type groove 4, transmission light-receiving PIN1, reflection light-receiving PIN2 and thermistor 3 pass through dispensing side after encapsulating Formula is fixedly arranged on temperature control chip 6, described thermistor 3, described temperature control chip 6, described transmission light-receiving PIN1 is connected with described reflection light-receiving PIN2 by fly line with stitch, and is sealed after full of inert gas, optical fiber and pin The junction of pin and housing 8 is sealed and fixed by dispensing.The structure of encapsulation is by tail optical fiber 7 and external pin 9 with being System carries out light path and connected with circuit.
In a kind of preferably embodiment, described frequency stabilization circuit includes comparator and reversed feedback amplifier 20, described Comparator proportional level the input output end with described transmission light-receiving PIN1 and described reflection light-receiving respectively PIN2 output end is connected, and the output end of described comparator is connected with the input of described reversed feedback amplifier 20, The output end of described feedback amplifier is connected with the input of described semiconductor laser 10.
The step of this programme is embodied is as follows：
1) it is then that optical fiber is certain along length travel as shown in figure 1, G.652 on optical fiber, making first paragraph FBG first After distance, second segment FBG is made.Making FBG can use conventional phase mask plate uv-exposure method to realize.
2) as shown in Fig. 2 testing out the cascade FBG5 to complete transmittance graph and reflectance curve.Calculate ratio Example curve is simultaneously chosen in proportional curve, and ratio rate of change maximum position in center resonance peak is as rrequency-offset-lock Frequency point.
3) as shown in figure 3, by way of dispensing fixation, it is arranged on after cascade FBG5 is tensed in optical fiber U-type groove 4, and Together with PIN and thermistor 3, it is fixed on mode for dispensing glue on TEC, forms package module.It is by fly line that temperature-sensitive is electric Resistance 3, TEC, and the PIN externally connected pin 9 of pin, most module carries out welding envelope in the environment of filled with nitrogen at last Dress, and external terminal and optical fiber disengaging position dispensing are sealed, form frequency stabilization module.
4) as shown in figure 4, semiconductor laser 10 frequency stabilization system of the structure based on cascade FBG5：First, semiconductor laser The output light of device 10 is divided for output light and detection light after fibre optic isolater 11 by fiber coupler 12；Soft exchange is detected to optical fiber The first port of circulator 13, the second port of optical fiber circulator 13 are connected with cascade FBG5, and detection light is by cascade FBG5 shapes Is received respectively into transmitted light and reflected light and by transmission light-receiving PIN1 and reflection light-receiving PIN2 and form transmitted light intensity and instead Light intensity electric signal is penetrated, wherein reflection light-receiving PIN2 is connected with the 3rd port of optical fiber circulator 13；Transmitted light intensity and reflected light After forceful electric power signal forms ratio by analog divider 17, compared with default datum 18, by a proportional integral circuit 19 Produce error signal and laser simultaneously controlled by negative feedback amplifier circuit, realize frequency stabilization, in figure 14 for encapsulation cascade FBG modules.
5) as shown in figure 5, by postponing self-heterodyne method, the laser linewidth tested before and after frequency stabilization, it can be seen that we Case can be effectively compressed the line width of laser, so as to which proof scheme can have the function that effective frequency stabilization.
The frequency stabilization of semiconductor laser system based on cascade fiber grating in the utility model is employed, is had with following Beneficial effect：
1st, using the cascade FBG by G.652 optical fiber fabrication, have manufacturing technology ripe simple, manufacturing price is cheap, is adapted to Large-scale production, is easy to same fibre system coupling and size is smaller, is easy to the advantages such as construction packages.
2nd, using the light path of all -fiber form, avoid that free space light path mounting structure is complicated and adjustment on it is tired Difficulty, while reduce economy and time cost in production.
3rd, to form ratio and relock to by the way of reference value using detecting transmitted light intensity and reflective light intensity simultaneously and be divided by, carry The signal to noise ratio of frequency discrimination signal and sensitive has been risen, traditional frequency stabilization scheme has been eliminated and uses detection light and reference light difference rrequency-offset-lock In mode, due to the inaccurate caused noise in laser power swing itself and offset frequency position.
In this description, the utility model is described with reference to its specific embodiment.But it is clear that still can be with Various modification can be adapted and conversion is without departing from spirit and scope of the present utility model.Therefore, specification and drawings are considered as It is illustrative and not restrictive.

Claims (9)

  1. A kind of 1. frequency stabilization of semiconductor laser system based on cascade fiber grating, it is characterised in that described frequency stabilization system bag Include semiconductor laser, isolator, coupler, circulator, cascade fiber grating, transmission light-receiving PIN, reflection light-receiving PIN, Transmission signal operational amplifier, reflected signal operational amplifier and frequency stabilization circuit, the output end of described semiconductor laser with The input of described isolator is connected, and the output end of described isolator is connected with the input of described coupler, The detection light output end of described coupler is connected with the first end of described circulator, the second end of described circulator with The input of described cascade fiber grating is connected, and the 3rd end of described circulator is with described reflection light-receiving PIN's Input is connected, and the output end of described cascade fiber grating is connected with described transmission light-receiving PIN input, institute The transmission light-receiving PIN stated output end is connected with the input of described transmission signal operational amplifier, described reflection Light-receiving PIN output end is connected with the input of described reflected signal operational amplifier, described transmission signal computing The input phase of the output end of amplifier and the output end of described reflected signal operational amplifier with described frequency stabilization circuit Connection, the output end of described frequency stabilization circuit are connected with the input of described semiconductor laser.
  2. 2. the frequency stabilization of semiconductor laser system according to claim 1 based on cascade fiber grating, it is characterised in that institute The semiconductor laser stated is semiconductor DFB and exported with fiber coupling.
  3. 3. the frequency stabilization of semiconductor laser system according to claim 1 based on cascade fiber grating, it is characterised in that institute The isolator stated is fibre optic isolater, and the input and output of described fibre optic isolater are fiber coupling, and with steel pipe envelope The dual-port of dress or glass-encapsulated.
  4. 4. the frequency stabilization of semiconductor laser system according to claim 1 based on cascade fiber grating, it is characterised in that institute The coupler stated is fiber coupler, and the input and output of described fiber coupler are fiber coupling, and with steel pipe envelope Three ports of dress or glass-encapsulated.
  5. 5. the frequency stabilization of semiconductor laser system according to claim 1 based on cascade fiber grating, it is characterised in that institute The circulator stated is optical fiber circulator, and the input and output of described optical fiber circulator are fiber coupling, and with steel pipe envelope Three ports of dress or glass-encapsulated.
  6. 6. the frequency stabilization of semiconductor laser system according to claim 1 based on cascade fiber grating, it is characterised in that institute The cascade fiber grating stated includes one pre-determined distance of interval and is successively arranged at multiple identical fiber gratings on single-mode fiber.
  7. 7. the frequency stabilization of semiconductor laser system according to claim 1 based on cascade fiber grating, it is characterised in that institute A photodetector for detection transmitted light intensity in the transmission light-receiving PIN and described reflection light-receiving PIN that state, it is another The individual photodetector for detection reflective light intensity.
  8. 8. the frequency stabilization of semiconductor laser system according to claim 1 based on cascade fiber grating, it is characterised in that institute The cascade fiber grating stated by way of pretension, be fixed in U-type groove by dispensing, described U-type groove, transmission light-receiving PIN, Reflect after light-receiving PIN and thermistor encapsulation and temperature control chip, described thermistor, institute are fixedly arranged on by dispensing mode Temperature control chip, the described transmission light-receiving PIN stated is connected with described reflection light-receiving PIN by fly line with stitch, And sealed after full of inert gas, optical fiber and the junction of stitch and housing are sealed and fixed by dispensing.
  9. 9. the frequency stabilization of semiconductor laser system according to claim 1 based on cascade fiber grating, it is characterised in that institute The frequency stabilization circuit stated includes comparator and reversed feedback amplifier, the proportional level input of described comparator respectively with it is described Transmission light-receiving PIN output end is connected with described reflection light-receiving PIN output end, the output end of described comparator It is connected with the input of described reversed feedback amplifier, the output end of described feedback amplifier and described semiconductor laser The input of device is connected.
CN201720556219.9U 2017-05-18 2017-05-18 Frequency stabilization of semiconductor laser system based on cascade fiber grating Active CN206894002U (en)

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