CN203491504U - Tunable laser - Google Patents
Tunable laser Download PDFInfo
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- CN203491504U CN203491504U CN201320586985.1U CN201320586985U CN203491504U CN 203491504 U CN203491504 U CN 203491504U CN 201320586985 U CN201320586985 U CN 201320586985U CN 203491504 U CN203491504 U CN 203491504U
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Abstract
The utility model discloses a tunable laser, comprising a semiconductor refrigerator, a transition heat sink, a laser array chip, a micro motor, an optical fiber, a first demultiplexer, a mode converter, single-mode optical fibers, a second demultiplexer, a wavelength lock, a photo-detector, a laser array chip drive circuit, a temperature control circuit, a micro motor drive circuit, and a microprocessor. The micro motor is provided with a slide block which can move along the stroke direction of the micro motor. The optical fiber is fixed on the slide block of the micro motor. The end, fixed with the slide block, of the optical fiber is a laser incident end, while the other end is connected with the mode converter. The first demultiplexer is connected with the mode converter and the second demultiplexer through the single-mode optical fibers, respectively. The other end of the second demultiplexer is then connected to the wavelength lock and the photo-detector. The transition heat sink is fixed in the top part of the semiconductor refrigerator. The laser array chip is fixed in the top part of the transition heat sink. The tunable laser is advantaged by low power consumption, high precision, low cost, and the like.
Description
Technical field
The utility model belongs to LASER Light Source field, refers more particularly to a kind of tunable laser, is applicable to the Wavelength tunable laser of communication and sensing.
Background technology
Tunable laser is can continuously change the laser of laser output wavelength in certain wave-length coverage, it is of many uses, can be used for spectroscopy, photochemistry, medical science, biology, integrated optics, pollution monitoring, semi-conducting material processing, information processing and communicates by letter etc.Along with WDM(wavelength division multiplexing) technology more and more applies at fiber optic communication field, tunable laser is by a research emphasis that is present and following each colleges and universities and scientific research institution, in addition domestic optical communication enterprise is being faced with the pressure of industry technology upgrade, and this will expedite the emergence of market greatly to tunable laser instrument demand.Yet at present actual conditions are that the type product relies on import substantially, not only expensive and monopolized by overseas enterprise few in number.
Realize the tuning principle of optical maser wavelength and roughly have three kinds.Most of tunable laser are all used the operation material with wide fluorescent line.The resonant cavity that forms laser only just has very low loss in very narrow wave-length coverage.Therefore, the first is by some element (as grating), to change the corresponding wavelength in resonant cavity low-loss district to change sharp light wavelength.The second is by changing some external parameter (as magnetic field, temperature etc.), to make the energy shift of laser transition.The third is to utilize nonlinear effect to realize conversion and tuning (the seeing nonlinear optics, stimulated Raman scattering, light two frequencys multiplication, optical parametric oscillation) of wavelength.
The tuning principle that realizes of at present external semiconductor laser with tunable mainly can be divided into three kinds: electric current tuning, thermal tuning and mechanical tuning, and selected semiconductor laser light source is also determined by tuning manner.
Electric current tuning is to realize the tuning of wavelength by changing Injection Current, and its tuned speed is ns rank, is mainly used in SG-DBR(sampling grating DBR) sample dorsad reflection with the auxiliary grating directional couple of GCSR() laser.Its General Principle is by changing the fiber grating of diverse location and the electric current of phase control part in tunable laser, the relative index of refraction of fiber grating can be changed, producing different spectrum.The selection of specific wavelength is carried out in the stack of the different spectrum that produce by zones of different fiber grating, thereby produces the laser of the specific wavelength needing.Injection Current by Bragg grating district before and after changing changes echo area material effective refractive index, and bragg wavelength changes thereupon, completes the coarse adjustment of wavelength.Then the electric current in control phase district makes the reflection peak of Mo Tong echo area, chamber unanimously realize fine tuning.But there is mode hopping problem in this type tunable laser, the stability in the time of can having a strong impact on laser works.
Thereby thermal tuning is to adjust laser cavity temperature to realize wavelength change, is mainly used in Distributed Feedback Laser.In module, general built-in FP etalon and luminous power detect, and separately have two independently wavelength that are used for controlling laser of TEC, and one is used for guaranteeing FP etalon and the work of optical power detector constant temperature.When operating temperature range is spent to 50 at-10 degree, tunable 6nm left and right, but required tuning period is a second rank.
Mechanical tuning generally adopts MEMS to realize, and is applicable to DFB structure and vcsel structure.Tunable laser mainly comprises dfb laser array or VCSEL laser array and MEMs part and other controls and slave part.By controlling the specific wavelength to needs of MEMs part, select, thus the light of the specific wavelength that output needs.Tunable laser tuning period based on this principle is generally a millisecond rank.
Summary of the invention
The purpose of this utility model is to provide a kind of tunable laser, and the utility model is low in energy consumption, high accurate, low-cost.
The technical solution that realizes the utility model object is: a kind of tunable laser, comprises semiconductor cooler, transition is heat sink, laser array chip, electrical micro-machine, optical fiber, the first splitter, mode converter, monomode fiber, the second splitter, wavelength locker, photo-detector, laser array chip drive circuit, temperature control circuit, micromotor drive circuit and microprocessor; Electrical micro-machine is provided with the slide block that can move along electrical micro-machine stroke directions, and optical fiber is fixed on the slide block of electrical micro-machine, and the fixing one end of optical fiber and slide block is sharp light incident side, other end connection mode transducer; The first splitter is connected with the second splitter with mode converter respectively by monomode fiber, and the other end of the second splitter is connected with photo-detector with wavelength locker again; Transition is heat sink is fixed on semiconductor cooler top, laser array chip is fixed on the heat sink top of transition, laser array chip drive circuit connecting laser array chip provides drive current for it, semiconductor cooler is connected with laser array chip, and temperature control circuit connects semiconductor cooler and controls laser array chip temperature; Laser array chip drive circuit is connected with microprocessor respectively with temperature control circuit, the signal of telecommunication of laser array chip drive circuit and temperature control circuit provides output by microprocessor, and laser array chip drive circuit provides bias current to laser array chip work; The signal of telecommunication of micromotor drive circuit provides output by microprocessor, and micromotor drive circuit drives electrical micro-machine work; The light signal of laser array chip output externally carries out data output from the first splitter by the first port, then by the second port, connects the second splitter and carry out Data Detection; Wherein, second splitter the first port connects the wavelength parameter in wavelength locker sensed light signal, and the second port connects the power parameter in photo-detector sensed light signal, completes the Data Detection to light signal; These detect data and feed back to again microprocessor, thereby maintain the normal work of whole system.
Array laser is the bar stripe shape dfb laser array of 1 * N, and N is natural number.
Electrical micro-machine integrated motion precision is 1um, and electrical micro-machine is that diameter is less than the motor that 160mm or rated power are less than 750W.
Optical fiber is communication class special optical fiber.
Mode converter is realized optical fiber to the conversion of monomode fiber, and typical loss is 3dB.
Wavelength locker is used for feeding back wavelength shifted signal to microprocessor.
Photo-detector is photodiode, and the laser in coupled into optical fibres is converted to electric current, and its current feedback comes control micro electric machine drive circuit to make optical fiber reach Best Coupling position to control stroke to microprocessor.
Laser array chip drive circuit, temperature control circuit, micromotor drive circuit and microprocessor are integrated on a PCB circuit board.
The splitting ratio of the feedback port of the first splitter is 1%-10%; The splitting ratio of second splitter the first port is 50%.
The utility model compared with prior art, its remarkable advantage: 1, higher coupling efficiency: optical fiber adopts grinding core to burn after ball, can reach more than 95% with the coupling efficiency of chip of laser.It is larger that optical fiber is compared monomode fiber tolerance, and existing general micromachine precision can meet the requirement of higher coupling efficiency in motor adjustment process.Add the loss of splitter and mode converter, the coupling efficiency of this tunable laser can reach more than 45%.
2, tuning bandwidth is large: this programme adopts the thermal tuning of laser array chip+semiconductor cooler to realize tunable laser.General single chips changes temperature 10 degree, wavelength shift 1nm, change the bandwidth that 40 degree can stable regulation 4nm, only need to improve number of chips and can realize super large-scale bandwidth tuning in this programme, the array of 8 chips can be realized the full C-band wavelength tuning of 32nm.
3, low cost: the core laser array chip of using in this programme is made for autonomous Design, guarantee the consistency of chip wavelength interval, cost is well below the DBR chip of laser of general tunable laser on market, remaining part is all the existing mature technology in market, only need adjust a little.
Accompanying drawing explanation
Fig. 1 is the general structure schematic diagram of the utility model tunable laser.
Fig. 2 is the schematic diagram of the utility model tunable laser.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in further detail.
In conjunction with Fig. 1 and Fig. 2, a tunable laser, by semiconductor cooler 1, transition is heat sink 2, laser array chip 3, electrical micro-machine 4, optical fiber 5, the first splitter 6, mode converter 7, monomode fiber 11, the second splitter 8, wavelength locker 9, photo-detector 10, laser array chip drive circuit, temperature control circuit, micromotor drive circuit and microprocessor form.The tunable implementation method of the utility model is by machinery, to be undertaken tentatively tuningly, then carries out precision tuning by electric current and temperature.Therefore, laser array chip drive circuit provides suitable output current driving laser array chip, and temperature control circuit provides suitable working temperature to array laser chip 3 by semiconductor cooler 1, above-mentioned two drive circuits have guaranteed the normal running conditions of array laser chip 3 and can realize the precision tuning of electric current and temperature.And the preliminary tuning of machinery is that micromotor drive circuit drives electrical micro-machine 4 work to drive optical fiber 5 to be coupled, the realization of its coupling process is by control micro electric machine drive circuit, to drive electrical micro-machine 4 by microprocessor, make its linear scanning of carrying out one dimension (unclear and coherent, can make pauses in reading unpunctuated ancient writings), scanning direction is with consistent along the orientation of array laser chip 3.In scanning process, the light signal of laser array chip 3 outputs can enter in optical fiber 5, through mode converter 7, light signal is proceeded in monomode fiber 11 again, monomode fiber 11 externally carries out data output through the first splitter 6 by the first port, by the second port, connect the second splitter 8 again and carry out Data Detection, wherein the optimum light splitting ratio that goes out optical port and feedback port of the first splitter 6 is 9:1.Moreover, the second splitter 8 first ports connect the wavelength parameter in wavelength locker 9 sensed light signal, the second port connects the power parameter in photo-detector 10 sensed light signal, complete the Data Detection to light signal, wherein the optimum light splitting ratio of the first port of the second splitter 8 and the second port is 1:1.Above-mentioned photo-detector 10 detects luminous power parameter and feeds back to again microprocessor, and microprocessor comes control micro electric machine to adjust fiber position according to the size of luminous power, thereby until optical power value reaches the coupling work that predetermined optical power value completes electrical micro-machine 4.And the wavelength parameter that wavelength locker 9 obtains also feeds back to microprocessor, microprocessor 4 is controlled array laser chip drive circuit and temperature control circuit according to the difference of gained wavelength and preset wavelength, until gained wavelength value reaches, preset light wave long value, thereby complete whole wavelength tuning work.
Laser array chip drive circuit is current driving circuit, and the voltage signal that microprocessor is provided converts current signal to and sends corresponding light signal with drive laser array chip; Temperature control circuit is to drive semiconductor cooler to control temperature, the signal of telecommunication of microprocessor is converted into temperature signal, to guarantee that laser array chip is operated in suitable temperature environment; Micromotor drive circuit is drive electrical micro-machine work and drive optical fiber to move, and the low signal of telecommunication by microprocessor of its function is converted into the spatial movement amount of optical fiber; Microprocessor is the information processing centre that this system is controlled.
A kind of tunable laser, laser array chip 3 is four dfb laser array chips, at semiconductor cooler 1(TEC) under temperature control 25 degree, wavelength is respectively 1529.55nm, 1532.68nm, 1535.82nm, 1538.98nm(meet ITU-T optical communication standard).Drive circuit for laser provides bias current to laser array chip, and temperature control circuit is used for regulating the temperature of semiconductor cooler 1, and the rectilinear path of microprocessor control micro electric machine 4 makes laser array chip 3 couplings of optical fiber and required passage.Coupling output is connected to mode converter 7, transfers monomode fiber 11 to.Monomode fiber 11 connects the first splitter 6, wherein 95% end output, and 5% termination enters the second splitter 8.The second splitter 8 by light 1:1 along separate routes, then accesses respectively photo-detector 10 and wavelength locker 9.Electrical micro-machine control circuit is by detecting the electric current of photo-detector 10 and then the coupling that control micro electric machine is realized optical fiber and laser array chip 3.Meanwhile, wavelength locker 9 detects wavelength and whether reaches preset wavelength, and differential signal is fed back to microprocessor, and microprocessor regulates temperature by temperature control circuit, controls wavelength.
Embodiment mono-, the 1 step, only gives first passage chip power supply 30mA left and right in laser array chip, TEC temperature 25 degree, and optical fiber and first laser alignment, realize output wavelength 1532.68nm; The 2nd step, by the feedback of wavelength locker 9, improving TEC temperature is 33 degree left and right, output wavelength 1533.48nm; The 3rd step, by the feedback of wavelength locker 9, improving TEC temperature is 41 degree left and right, output wavelength 1534.28nm; The 4th step, by the feedback of wavelength locker 9, improving TEC temperature is 49 degree left and right, output wavelength 1535.08nm; The 5th step, only gives second channel chip power supply 30mA left and right in laser array chip, by the feedback of photo-detector 10, drive motors regulates optical fiber to aim at second channel chip, by the feedback of wavelength locker 9, regulating TEC temperature is 25 degree, output wavelength 1535.82nm; The 5th step, by the feedback of wavelength locker 9, regulating TEC temperature is 33 degree, output wavelength 1536.62nm; By that analogy, realize 12nm bandwidth, the tunable laser output at 0.8nm interval.
The above; it is only preferred embodiment of the present utility model; not the utility model is imposed any restrictions; every any simple modification of above embodiment being done according to the utility model technical spirit, change and equivalent structure change, and all still belong in the protection range of technical solutions of the utility model.
Claims (9)
1. a tunable laser, is characterized in that: comprise semiconductor cooler (1), transition is heat sink (2), laser array chip (3), electrical micro-machine (4), optical fiber (5), the first splitter (6), mode converter (7), monomode fiber (11), the second splitter (8), wavelength locker (9), photo-detector (10), laser array chip drive circuit, temperature control circuit, micromotor drive circuit and microprocessor; Electrical micro-machine (4) is provided with can be along the slide block of electrical micro-machine (4) stroke directions motion, and optical fiber (5) is fixed on the slide block of electrical micro-machine (4), and the fixing one end of optical fiber (5) and slide block is sharp light incident side, other end connection mode transducer (7); The first splitter (6) is connected with the second splitter (8) with mode converter (7) respectively by monomode fiber (11), and the other end of the second splitter (8) is connected with photo-detector (10) with wavelength locker (9) again; Transition is heat sink (2) is fixed on semiconductor cooler (1) top, laser array chip (3) is fixed on transition heat sink (2) top, laser array chip drive circuit connecting laser array chip provides drive current for it, semiconductor cooler is connected with laser array chip (3), and temperature control circuit connects semiconductor cooler and controls laser array chip (3) temperature; Laser array chip drive circuit is connected with microprocessor respectively with temperature control circuit, the signal of telecommunication of laser array chip drive circuit and temperature control circuit provides output by microprocessor, and laser array chip drive circuit provides bias current to work to laser array chip (3); The signal of telecommunication of micromotor drive circuit provides output by microprocessor, and micromotor drive circuit drives electrical micro-machine (4) work; The light signal of laser array chip (3) output externally carries out data output from the first splitter (6) by going out optical port, then by feedback port, connects the second splitter (8) and carry out Data Detection; Wherein, the second splitter (8) first ports connect the wavelength parameter in wavelength locker (9) sensed light signal, and the second port connects the power parameter in photo-detector (10) sensed light signal, completes the Data Detection to light signal; These detect data and feed back to again microprocessor, thereby maintain the normal work of whole system.
2. tunable laser according to claim 1, is characterized in that: the bar stripe shape dfb laser array that array laser is 1 * N, N is natural number.
3. tunable laser according to claim 1, is characterized in that: electrical micro-machine (4) integrated motion precision is 1um, and electrical micro-machine (4) is less than the motor that 160mm or rated power are less than 750W for diameter.
4. tunable laser according to claim 1, is characterized in that: optical fiber (5) is communication class special optical fiber.
5. tunable laser according to claim 1, is characterized in that: mode converter (7) is realized optical fiber (5) to the conversion of monomode fiber (11), and typical loss is 3dB.
6. tunable laser according to claim 1, is characterized in that: wavelength locker (9) is used for feeding back wavelength shifted signal to microprocessor.
7. tunable laser according to claim 1, it is characterized in that: photo-detector (10) is photodiode, laser in coupled into optical fibres is converted to electric current, and its current feedback comes control micro electric machine drive circuit to make optical fiber reach Best Coupling position to control stroke to microprocessor.
8. tunable laser according to claim 1, is characterized in that: laser array chip drive circuit, temperature control circuit, micromotor drive circuit and microprocessor are integrated on a PCB circuit board (12).
9. tunable laser according to claim 1, is characterized in that: the splitting ratio of the feedback port of the first splitter (6) is 1%-10%; The splitting ratio of the second splitter (8) first ports is 50%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320586985.1U CN203491504U (en) | 2013-09-23 | 2013-09-23 | Tunable laser |
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| CN201320586985.1U CN203491504U (en) | 2013-09-23 | 2013-09-23 | Tunable laser |
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| CN203491504U true CN203491504U (en) | 2014-03-19 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104466669A (en) * | 2013-09-23 | 2015-03-25 | 南京威宁锐克信息技术有限公司 | Tunable laser device |
| CN105186282A (en) * | 2015-08-25 | 2015-12-23 | 中国科学院半导体研究所 | High-frequency-stabilization tunable narrow linewidth laser and use method thereof |
| CN112086857A (en) * | 2020-06-05 | 2020-12-15 | 哈尔滨工业大学 | Method and device for acquiring splicing position of continuously tunable laser and corresponding method and device for outputting continuously tunable laser |
-
2013
- 2013-09-23 CN CN201320586985.1U patent/CN203491504U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104466669A (en) * | 2013-09-23 | 2015-03-25 | 南京威宁锐克信息技术有限公司 | Tunable laser device |
| CN105186282A (en) * | 2015-08-25 | 2015-12-23 | 中国科学院半导体研究所 | High-frequency-stabilization tunable narrow linewidth laser and use method thereof |
| CN112086857A (en) * | 2020-06-05 | 2020-12-15 | 哈尔滨工业大学 | Method and device for acquiring splicing position of continuously tunable laser and corresponding method and device for outputting continuously tunable laser |
| CN112086857B (en) * | 2020-06-05 | 2021-12-28 | 哈尔滨工业大学 | Method and device for acquiring splicing position of continuously tunable laser and corresponding method and device for outputting continuously tunable laser |
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