CN102931584A - Wavelength-tunable laser system and control method thereof - Google Patents
Wavelength-tunable laser system and control method thereof Download PDFInfo
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Abstract
The invention relates to a high-precision wavelength-tunable laser system and a control method thereof. According to the high-precision wavelength-tunable laser system, a plurality of DFB (Distributed Feed Back) laser modules are arranged in parallel side by side or in a fan-shaped manner to form an array, and laser is converged in optical waveguide. DFB lasers are positioned in one or more TEC (Thermoelectric Cooler) as a single array or multiple arrays side by side or in a laminated manner. One path of a laser beam enters a direct monitoring PD (Photoelectric Diode), another path of the laser beam enters a wavelength locking PD through Etalon and the other path of the laser beam is output. A microprocessor receives signals input by a temperature sensor, the direction monitoring PD and the wavelength locking PD on each TEC and controls each DFB laser module, each TEC and a direction control mirror. The microprocessor selects certain DFB laser module to work according to the emission wavelength and controls the temperature of the TEC. The control method comprises the following steps of: controlling the TEC to roughly adjust the DFB output wavelength according to a theory, adjusting the TEC of the Etalon to a set temperature, obtaining the output laser wavelength according to the Etalon transmission efficiency and then accurately controlling the DFB output wavelength according to the output laser wavelength. The high-precision wavelength-tunable laser system and the control method thereof have the advantages of high precision, high stability, simple structure and capability of obtaining laser in the communication wavelength range of the whole C+L waveband.
Description
(1) technical field
The present invention relates to the laser technique field, be specially a kind of high-precision wavelength tunable laser system and control method thereof.
(2) background technology
Tunable laser is widely used in the systems such as optical-fibre communications and Fibre Optical Sensor, Wavelength tunable laser can alleviate the immense pressure of dense wavelength division multiplexing system in light source configuration, backup and maintenance greatly, improving the cost performance of fiber optic network, is the focus of current research.Developed at present multi-wavelength's tunable laser, such as distributed Feedback (DFB) laser, exterior resonant cavity laser (ECL), microelectromechanical systems (MEMS) Q-swith laser Q etc.Wherein distributed Feedback (DFB) laser has higher stability, good spectrum and noise characteristic, and preferably power stage, and cost is low, technology maturation.The temperature that depends on laser module based on the wavelength change of the DFB Laser emission of temperature control technology.In order to control the Wavelength stabilized of Distributed Feedback Laser, must adopt automatic temperature control apparatus, keep certain working temperature of laser.The general semiconductor thermoelectric refrigeration device (TEC) that adopts carries out temperature control.Change temperature and can carry out fine tune to Distributed Feedback Laser.For the centre wavelength standard DFB laser that is 1550nm, temperature to the tuning precision of wavelength the chances are 100pm/ ℃.Namely a Distributed Feedback Laser is by adjusting to the 60 ℃ of wavelength tunings that just can realize 5nm with the temperature of laser module from 10 ℃.But can't obtain the tuning laser of high precision in wider wave-length coverage.
Will carry out accurately the optical maser wavelength of output on the other hand tuningly, just need the accurately wavelength of the real time measure Output of laser, existing general optical wavelength determinator is difficult to reach the requirement of real-time feedback control.Wavemeter precision based on Etalon is high, resolution is high, and sweep speed more is significantly increased, but the report that specifically is applied to laser control is not yet arranged at present.
(3) summary of the invention
The objective of the invention is to design a kind of high-precision wavelength tunable laser system and control method thereof.
The wavelength tunable laser system of the present invention's design comprises DFB laser module, thermoelectric (al) cooler (TEC) and control circuit, and described DFB laser module is the distributed feedback laser module.The DFB laser module places on the thermoelectric (al) cooler (TEC).The circuit of DFB laser module, the circuit of thermoelectric (al) cooler are connected with control circuit, and the wavelength tuning range of each DFB laser module is not identical, and the laser convergence that each DFB laser module produces is in fiber waveguide, and system exports the laser beam of different wave length.
8～20 DFB laser module set form DFB laser module array, and the structure of DFB laser module array mainly contains following two kinds:
8～20 DFB laser modules are side by side parallel in same plane, and laser beam converges at fiber waveguide through collector lens.
Perhaps by fan-shaped arranged evenly, the extended line of each DFB laser module center line meets at a bit in same plane for 8～20 DFB laser modules, and namely their laser of producing directly converges at fiber waveguide.
DFB laser module array consists of Distributed Feedback Laser, comprises one dimension Distributed Feedback Laser, the two-dimentional Distributed Feedback Laser of grouping and three-dimensional Distributed Feedback Laser.
Single DFB laser module array places and consists of the one dimension Distributed Feedback Laser on the thermoelectric (al) cooler.
2～4 DFB laser module arrays, be positioned on the same thermoelectric (al) cooler or 2～4 DFB laser module arrays lay respectively on 2～4 thermoelectric (al) coolers, the laser convergence that each laser module array produces consists of the two-dimentional Distributed Feedback Laser of grouping in same fiber waveguide.
2～4 DFB laser module arrays are positioned on the same thermoelectric (al) cooler, stacked placement or 2～4 DFB laser module arrays lay respectively on 2～4 thermoelectric (al) coolers, stacked placement, the laser convergence that each laser module array produces consists of three-dimensional Distributed Feedback Laser in same fiber waveguide.
According to needed wave-length coverage and Distributed Feedback Laser volume size, select suitable Distributed Feedback Laser composition form.
The thermoelectric (al) cooler this paper that places the DFB laser module is called the A thermoelectric (al) cooler.
For the wavelength of the laser that makes the output of each DFB laser module keeps high accuracy and stability, the control circuit of this tunable laser system comprises microprocessor, is installed on A temperature sensor, Etalon, direction monitor photodiode array and wavelength lock photodiode on the A thermoelectric (al) cooler.
Microprocessor has external or built-in D/A and A/D change-over circuit.Each output signal of microprocessor all becomes analog signal through the D/A change-over circuit; Each input signal of microprocessor all becomes digital signal by the A/D change-over circuit.
The A temperature sensor can be thermistor, an input of the signal of A temperature sensor access microprocessor (be called for sake of convenience first input end, irrelevant with input sequence, below identical therewith).The laser beam that Distributed Feedback Laser produces is divided into two-way by the M optical splitter after the output of direction control mirror, wherein first via laser straight taps into Inbound monitor photodiode array, the signal of telecommunication I of monitoring array output
1Access another input of microprocessor (being called the second input); And the second road laser enters the N spectrometer and is divided into two-way again, and wherein one road light beam is as the output of native system, and another road enters the wavelength locking photodiode, the signal of telecommunication I that the wavelength locking photodiode obtains again through behind the Etalon
2Send into another input (four-input terminal) of microprocessor.Each DFB laser module is in same A thermoelectric (al) cooler, microprocessor is furnished with internal or external P multichannel switching controls module, each DFB laser module circuit connects respectively the output of P multichannel switching controls module, the input of P multichannel switching controls module connects an output (being called the first output) of microprocessor, microprocessor is according to the needs of native system emission wavelength, input current by each DFB laser module of P multichannel switching controls module controls, the input current non-zero that only has the DFB laser module of current required wavelength, in running order, and microprocessor is controlled this current strength by the required transmitting power of current system; Be zero at the input current of other DFB laser modules of synchronization, namely do not work, without utilizing emitted light; The temperature control circuit of another output of microprocessor (being called the second output) access A thermoelectric (al) cooler is controlled its temperature, thereby it is tuning to carry out optical maser wavelength; The governor motion of another output of microprocessor (being called the 3rd output) closure control mirror is regulated direction control mirror, is controlled each DFB laser module output beam and be coupled into the transmission light path, the regulation output luminous power.
When a plurality of DFB laser module arrays are in respectively on a plurality of A thermoelectric (al) coolers, each A thermoelectric (al) cooler is separately installed with the A temperature sensor, the second output of microprocessor connects the temperature control circuit of each A thermoelectric (al) cooler through internal or external Q multichannel switching controls module, the first input end of microprocessor connects each A temperature sensor through internal or external R multichannel switching controls module.When P, Q, R multichannel switching controls module interlock, microprocessor select certain DFB laser module of control luminous, receive the residing A thermoelectric (al) cooler of this DFB laser module A temperature sensor Current Temperatures signal, control the temperature of this A thermoelectric (al) cooler.
The wavelength/frequency response characteristic of the efficiency of transmission T of Etalon in order to guarantee the working stability of Etalon, will guarantee the work of Etalon constant temperature with temperature change, thereby make its efficiency of transmission T not influenced by ambient temperature.Etalon places on the B thermoelectric (al) cooler, and at the B thermoelectric (al) cooler B temperature sensor is installed, the another input (being called the 3rd input) of the output access microprocessor of B temperature sensor, the temperature feedback of B thermoelectric (al) cooler is provided, and another output of microprocessor (being called the 4th output) connects the temperature control circuit of B thermoelectric (al) cooler and controls its temperature constant.
Described direction monitor photodiode array is n * n photodiode array, n is 2 or 3 or 4, array is symmetrical structure, determine the quantity of n according to the DFB laser module quantity of Distributed Feedback Laser, DFB laser module quantity is many, and output facula is large, the monitor photodiode of so required array is just many, and the monitor photodiode number is more, and is more accurate to laser direction control, but affects overall dimensions and cost.When adjusting direction control mirror namely changes the direction of Output of laser light beam, when perhaps changing the power of Distributed Feedback Laser output beam, the light distribution of each photodiode will change on the arrival direction monitor photodiode array, namely reflect the variation of the X/Y position light intensity of outbound course.Microprocessor is determined the light distribution situation according to the output signal of each photodiode on the photodiode array, calculates Output of laser power, to regulate the power output of direction control mirror and/or Distributed Feedback Laser.
Microprocessor is connected with the external control unit, receives the instruction of wavelength set.The external control unit is man-machine interface, and/or is the remote control that connects by wire and wireless.
The control method of wavelength tunable laser system of the present invention is as follows:
Native system output wavelength scope is set in I, external control unit, the theoretical accounting temperature that microprocessor is set wavelength according to feedback signal and the A thermoelectric (al) cooler of the A temperature sensor on the A thermoelectric (al) cooler, produce the error command signal of control A thermoelectric (al) cooler temperature control circuit, the preliminary temperature of adjusting the A thermoelectric (al) cooler, the Distributed Feedback Laser output wavelength is adjusted roughly, made it near requirement;
II, microprocessor are according to the setting working temperature of temperature feedback signal and the Etalon of the B temperature sensor on the B thermoelectric (al) cooler, produce the error command signal of control B thermoelectric-cooled actuator temperature, through the 4th output access B thermoelectric (al) cooler temperature control circuit, the temperature of adjusting the B thermoelectric (al) cooler is the working temperature that Etalon sets, form the real time temperature closed-loop control of Etalon, control B thermoelectric-cooled actuator temperature keeps constant, thereby guarantees Etalon constant temperature steady operation;
III, microprocessor are further adjusted the A thermoelectric (al) cooler according to the feedback information of efficiency of transmission again, thereby the Distributed Feedback Laser output wavelength are carried out trickle adjustment.Microprocessor read direction monitor photodiode array output electrical signals I
1Reflection Output of laser power, the output electrical signals I of wavelength lock photodiode
2Be the Output of laser power after the Etalon transmission, therefore can calculate the efficiency of transmission T=I of Etalon
2/ I
1Obtained the information of the optical maser wavelength of current output by the wavelength/frequency response characteristic of Etalon efficiency of transmission T, temperature feedback signal according to A temperature sensor on this wavelength information and the A thermoelectric (al) cooler, microprocessor produces the error command signal of control A thermoelectric-cooled actuator temperature, drive control A thermoelectric (al) cooler circuit through the second output, form the real-time closed-loop control of wavelength locking, accurately control the Distributed Feedback Laser output wavelength, realize the wavelength tuning of high accuracy and high stability.
IV, microprocessor is according to the power signal of outbound course monitor photodiode array feedback, the M spectrometer, the laser power value of the ratio of the light splitting of N spectrometer and setting, produce the command signal electric current of control Distributed Feedback Laser, through the first output access control Distributed Feedback Laser circuit, and/or produce controlling party to the command signal electric current of control mirror, driving mechanism through the 3rd output access direction control mirror, regulate direction control mirror, control each DFB laser module output beam and enter the transmission light path, thereby realize that control Output of laser power keeps constant, forms the real-time closed-loop control of Distributed Feedback Laser power.
When a plurality of DFB laser module arrays are in respectively on a plurality of A thermoelectric (al) coolers, the A thermoelectric (al) cooler of each DFB laser module array is separately installed with the A temperature sensor, the first output of microprocessor is selected the corresponding DFB laser module of current required wavelength of transmitted light through P multichannel switching controls module, the second output of microprocessor connects the residing A thermoelectric (al) cooler of this DFB laser module of control temperature control circuit through Q multichannel switching controls module, and the first input end of microprocessor receives the temperature information of the A temperature sensor of this thermoelectric (al) cooler through R multichannel switching controls module.
The advantage of wavelength tunable laser system of the present invention and control method thereof is: 1, use the combination array of a plurality of laser modules, and the temperature by control laser module array can obtain the laser of communication wavelength scope of the whole C+L wave band of 1525～1610nm; 2, control precision is high, and the thermoelectric (al) cooler temperature control precision of laser module array reaches 0.01 ℃, and according to the accurate feedback of Etalon wavelength locking system, the output wavelength control precision reaches 1pm; 3, stability is high, and the output wavelength of laser and power have real-time closed-loop control.4, simple in structure, small.
(4) description of drawings
Fig. 1 is the Distributed Feedback Laser structural representation of this wavelength tunable laser system embodiment 1;
Fig. 2 is the system configuration schematic diagram of this wavelength tunable laser system embodiment 1;
Fig. 3 is the efficiency of transmission curve chart under the Etalon different temperatures;
Fig. 4 is the efficiency of transmission curve chart of Etalon under design temperature;
Fig. 5 is the Distributed Feedback Laser structural representation of this wavelength tunable laser system embodiment 2;
Fig. 6 is the Distributed Feedback Laser structural representation of this wavelength tunable laser system embodiment 3;
Fig. 7 is the system configuration schematic diagram of this wavelength tunable laser system embodiment 3;
Fig. 8 is the Distributed Feedback Laser structural representation of this wavelength tunable laser system embodiment 4.
The figure internal label is: 1, DFB laser module; 2, A thermoelectric (al) cooler TEC, 3, collector lens, 4, fiber waveguide, 5, the A temperature sensor, 6, the B temperature sensor.
(5) embodiment
Wavelength tunable laser system embodiment 1
As shown in Figure 1,20 DFB laser modules 1 of this example are parallel to same plane, are in same thermoelectric (al) cooler (TEC), i.e. A thermoelectric (al) cooler 2 among the figure, and the laser beam that each DFB laser module 1 produces converges at fiber waveguide 4 through collector lens 3.This example is the one dimension Distributed Feedback Laser.The range of temperature of A thermoelectric (al) cooler 2 is 10～60 ℃, and the wavelength regulation scope of this routine Distributed Feedback Laser is 1525～1610nm, totally 20 passages, and each channel wavelength is spaced apart 4.5nm.
Figure 2 shows that this routine wavelength tunable laser system structure, comprise microprocessor, Distributed Feedback Laser, A thermoelectric (al) cooler and the A temperature sensor that is mounted thereon, M spectrometer, N spectrometer, direction monitor photodiode array (direction monitoring PD array), B thermoelectric (al) cooler and the Etalon that is mounted thereon and B temperature sensor, wavelength locking photodiode (wavelength locking PD).
The built-in A/D change-over circuit of microprocessor and D/A change-over circuit do not show among Fig. 2.
Described A temperature sensor and B temperature sensor are thermistor.
Dotted arrow is light path among Fig. 2, the laser beam that Distributed Feedback Laser produces is at first introduced the M spectrometer from fiber waveguide and is divided into the two-way light beam, the direct approach axis monitor photodiode of light beam array wherein, other light beam enters the N spectrometer and again is divided into two bundles, wherein enter the wavelength locking photodiode behind a branch of process Etalon, another light beam is as the Laser output of native system again.
Solid arrow is circuit among Fig. 2, the first input end of A temperature sensor signal access microprocessor 3., the signal of telecommunication I that direction monitor photodiode array obtains
1Send into the second input of microprocessor 5., 6. the output of B temperature sensor accesses microprocessor the 3rd input, the signal of telecommunication I that the wavelength locking photodiode obtains
2Send into the four-input terminal of microprocessor 8..1. the first output of microprocessor connects each DFB laser module through external P multichannel switching controls module, selects corresponding DFB laser module and controls laser output power; 2. the second output of microprocessor accesses the temperature control circuit of A thermoelectric (al) cooler and controls its temperature; 4. the 3rd output of microprocessor accesses direction control mirror, and direction control mirror is controlled each DFB laser module output beam and is coupled into transmission light path, regulation output luminous power; 7. the 4th output of microprocessor accesses the Etalon thermoelectric (al) cooler and controls its temperature.
This routine direction monitor photodiode array is 2 * 2 photodiode array, and array is symmetrical structure.
Microprocessor is connected with the external control unit.The external control unit is the remote control of man-machine interface and wireless connections.
The control method of this wavelength tunable laser system embodiment 1 is as follows:
Native system output wavelength scope is set in I, external control unit, the theoretical accounting temperature that microprocessor is set wavelength according to feedback signal and the A thermoelectric (al) cooler of the A temperature sensor on the A thermoelectric (al) cooler, produce the error command signal of control A thermoelectric (al) cooler, the preliminary temperature of adjusting the A thermoelectric (al) cooler, the Distributed Feedback Laser output wavelength is adjusted roughly, made it near requirement;
II, microprocessor are according to the setting working temperature of temperature feedback signal and the Etalon of the B temperature sensor on the B thermoelectric (al) cooler, produce the error command signal of control B thermoelectric-cooled actuator temperature, through the 4th output access B thermoelectric (al) cooler, the temperature of adjusting the B thermoelectric (al) cooler is the working temperature that Etalon sets, form the real time temperature closed-loop control of Etalon, control B thermoelectric-cooled actuator temperature keeps constant, thereby guarantees Etalon constant temperature steady operation; Abscissa is wavelength among Fig. 3, ordinate is efficiency of transmission, three curves are the relation curve of same Etalon efficiency of transmission and lambda1-wavelength under different temperatures among Fig. 3, this shows to keep Etalon constant temperature, and guarantee Etalon is constant to the efficiency of transmission of Same Wavelength incident light.
III, microprocessor are further adjusted the A thermoelectric (al) cooler according to the feedback information of efficiency of transmission again, thereby the Distributed Feedback Laser output wavelength are carried out trickle adjustment.Microprocessor read direction monitor photodiode array output electrical signals I
1Reflection Output of laser power, the output electrical signals I of wavelength lock photodiode
2Then reflect the Output of laser power after the Etalon transmission, therefore can calculate the efficiency of transmission T=I of Etalon
2/ I
1Abscissa is wavelength among Fig. 4, ordinate is efficiency of transmission, the curve of Fig. 4 is efficiency of transmission T and the lambda1-wavelength/frequency relation curve of the Etalon under the design temperature, this shows the information that can be obtained the optical maser wavelength of Distributed Feedback Laser output by the efficiency of transmission T of Etalon, temperature feedback signal according to A temperature sensor on this wavelength information and the A thermoelectric (al) cooler, microprocessor produces the error command signal of control A thermoelectric-cooled actuator temperature, drive control A thermoelectric (al) cooler through the second output, form the real-time closed-loop control of wavelength locking, accurately control the Distributed Feedback Laser output wavelength, realize the wavelength tuning of high accuracy and high stability.
IV, microprocessor is according to the power signal of outbound course monitor photodiode array feedback, the M spectrometer, the laser power value of the ratio of the light splitting of N spectrometer and setting, produce the command signal electric current of control Distributed Feedback Laser, through the first output access control Distributed Feedback Laser, and/or produce controlling party to the command signal electric current of control mirror, driving mechanism through the 3rd output access direction control mirror, regulate direction control mirror, control each DFB laser module output beam and enter the coupling of transmission light path, thereby realize that control Output of laser power keeps constant, forms the real-time closed-loop control of Distributed Feedback Laser power.
If the wavelength of Output of laser need to be to the long wave adjustment, then control circuit heats up, makes the wavelength of each DFB laser module in the Distributed Feedback Laser simultaneously to the adjustment of long wave direction by control A thermoelectric (al) cooler; Otherwise, if the wavelength of Output of laser need to the shortwave adjustment, then be controlled the cooling of A thermoelectric (al) cooler.So namely can realize the tuning of Output of laser by the temperature of control Distributed Feedback Laser.
The Output of laser light beam wavelength scope that the wavelength tunable laser system that this is routine and control method thereof produce is 1525～1610nm, covers the communication wavelength of whole C+L wave band, and tuning precision reaches 1pm, and stability is high.
Wavelength tunable laser system embodiment 2
This routine used Distributed Feedback Laser also is the one dimension Distributed Feedback Laser, as shown in Figure 5, by fan-shaped arranged evenly in same plane, the extended line of each DFB laser module 1 center line meets at a bit at same A thermoelectric (al) cooler 2 for 10 DFB laser modules 1, and namely their laser of producing directly converges at fiber waveguide 4.
Other structure is identical with embodiment 1.
Its using method is identical with embodiment 1.
The Output of laser light beam wavelength scope that the wavelength tunable laser system that this is routine and control method thereof produce is 1525～1568nm, covers the communication wavelength of whole C-band, and tuning precision reaches 1pm.
Wavelength tunable laser system embodiment 3
This routine used Distributed Feedback Laser as shown in Figure 6,10 DFB laser modules 1 are side by side parallel on same plane, the laser beam that each DFB laser module 1 produces converges at fiber waveguide 4 through collector lens 3, consists of 1 DFB laser module array.It is side by side parallel that 2 identical DFB laser module arrays respectively are in 2,2 A thermoelectric (al) coolers 2 of an A thermoelectric (al) cooler, and 2 fiber waveguides also become one, consists of the two-dimentional Distributed Feedback Laser of grouping.
This routine wavelength tunable laser system structure as shown in Figure 7, its light path and circuit are similar to Example 1.2 DFB laser module arrays lay respectively on 2 A thermoelectric (al) coolers, and 2 A thermoelectric (al) coolers respectively are equipped with the A temperature sensor.The first output of microprocessor connects respectively each DFB laser module of controlling in 2 DFB laser module arrays through external P multichannel switching controls module, the second output of microprocessor connects respectively the temperature control circuit of 2 thermoelectric (al) coolers through external Q two-way switching controls module, the first input end of microprocessor connects 2 A temperature sensors through external R two-way switching controls module.P multichannel switching controls module and Q, R two-way switching controls module interlock.
Its using method and embodiment 1 are similar.
Microprocessor connects certain DFB laser module, connect simultaneously the A temperature sensor of the residing A thermoelectric (al) cooler of this DFB laser module and the temperature control circuit of this A thermoelectric (al) cooler, receive temperature and this DFB laser module electric current of current this A thermoelectric (al) cooler temperature signal, control A thermoelectric (al) cooler, control the power of this Distributed Feedback Laser.
The Output of laser light beam wavelength scope that the wavelength tunable laser system that this is routine and control method thereof produce is 1525～1610nm, covers the communication wavelength of whole C+L wave band, and tuning precision reaches 1pm, and stability is high.
Wavelength tunable laser system embodiment 4
This routine used Distributed Feedback Laser as shown in Figure 8,10 DFB laser modules 1 are side by side parallel on same plane, the laser beam that each DFB laser module 1 produces converges at fiber waveguide 4 through collector lens 3, consists of 1 DFB laser module array.It is overlapping about in the of 2 that two identical DFB laser module arrays respectively are in 2,2 A thermoelectric (al) coolers of an A thermoelectric (al) cooler, and 2 fiber waveguides also become one, consist of three-dimensional Distributed Feedback Laser.
This routine wavelength tunable laser system as shown in Figure 7, and is identical with embodiment 3.
Its using method is also identical with embodiment 3.
The Output of laser light beam wavelength scope that the wavelength tunable laser system that this is routine and control method thereof produce is identical with precedent with tuning precision.
Above-described embodiment only is the specific case that purpose of the present invention, technical scheme and beneficial effect are further described, and the present invention is defined in this.All any modifications of within scope of disclosure of the present invention, making, be equal to replacement, improvement etc., all be included within protection scope of the present invention.
Claims (9)
1. wavelength tunable laser system, comprise DFB laser module, thermoelectric (al) cooler and control circuit, described DFB laser module is the distributed feedback laser module, and the DFB laser module places on the thermoelectric (al) cooler, the thermoelectric (al) cooler circuit is connected with control circuit, it is characterized in that:
The wavelength tuning range of each DFB laser module is not identical, and the laser convergence that each DFB laser module produces is in fiber waveguide, and system exports the laser beam of different wave length.
2. wavelength tunable laser system according to claim 1 is characterized in that:
8～20 DFB laser module set form DFB laser module array, and 8～20 DFB laser modules are side by side parallel in same plane, and laser beam converges at fiber waveguide through collector lens; Perhaps by fan-shaped arranged evenly, the extended line of each DFB laser module center line meets at a bit in same plane for 8～20 DFB laser modules, and namely their laser of producing directly converges at fiber waveguide;
Single DFB laser module array places and consists of the one dimension Distributed Feedback Laser on the thermoelectric (al) cooler;
Perhaps, 2～4 DFB laser module arrays, be positioned on the same thermoelectric (al) cooler or 2～4 DFB laser module arrays lay respectively on 2～4 thermoelectric (al) coolers, the laser convergence that each laser module array produces consists of the two-dimentional Distributed Feedback Laser of grouping in same fiber waveguide;
Perhaps, 2～4 DFB laser module arrays are positioned on the same thermoelectric (al) cooler, stacked placement or 2～4 DFB laser module arrays lay respectively on 2～4 thermoelectric (al) coolers, stacked placement, the laser convergence that each laser module array produces consists of three-dimensional Distributed Feedback Laser in same fiber waveguide.
3. wavelength tunable laser system according to claim 1 and 2 is characterized in that:
The thermoelectric (al) cooler of above-mentioned placement DFB laser module is called the A thermoelectric (al) cooler;
Described control circuit comprises microprocessor, is installed on A temperature sensor, Etalon, direction monitor photodiode array and wavelength lock photodiode on the A thermoelectric (al) cooler;
Microprocessor has external or built-in D/A and A/D change-over circuit; Each output signal of microprocessor all becomes analog signal through the D/A change-over circuit; Each input signal of microprocessor all becomes digital signal by the A/D change-over circuit;
The first input end of the signal access microprocessor of A temperature sensor, the laser beam that Distributed Feedback Laser produces is divided into two-way by the M optical splitter after the output of direction control mirror, wherein first via laser straight taps into Inbound monitor photodiode array, the signal of telecommunication I of direction monitor photodiode array output
1Access microprocessor the second input; And the second road laser enters the N spectrometer and is divided into two-way again, and wherein one road light beam is as the output of native system, and another road enters the wavelength locking photodiode, the signal of telecommunication I that the wavelength locking photodiode obtains again through behind the Etalon
2Send into the four-input terminal of microprocessor; Each DFB laser module is in same A thermoelectric (al) cooler, and each DFB laser module circuit connects respectively the internal or external P multichannel switching controls module output of microprocessor, and the input of P multichannel switching controls module connects the first output of microprocessor; Microprocessor is according to the needs of native system emission wavelength, input current by each DFB laser module of P multichannel switching controls module controls, the input current non-zero, in running order that only has the DFB laser module of current required wavelength, and microprocessor is controlled this current strength by the required transmitting power of current system, input current at other DFB laser modules of synchronization is zero, without utilizing emitted light; The temperature control circuit of the second output of microprocessor access A thermoelectric (al) cooler is controlled its temperature, thereby it is tuning to carry out optical maser wavelength; The governor motion of the 3rd output closure control mirror of microprocessor.
4. wavelength tunable laser system according to claim 3 is characterized in that:
When a plurality of DFB laser module arrays are in respectively on a plurality of A thermoelectric (al) coolers, each A thermoelectric (al) cooler is separately installed with the A temperature sensor, the second output of microprocessor connects the temperature control circuit of each A thermoelectric (al) cooler circuit through internal or external Q multichannel switching controls module, the first input end of microprocessor connects each A temperature sensor through internal or external R multichannel switching controls module; When P, Q, R multichannel switching controls module interlock, microprocessor are selected certain DFB lasing fluorescence of control, receive this DFB laser module A thermoelectric (al) cooler of living in A temperature sensor temperature signal, control the temperature control circuit of this A thermoelectric (al) cooler.
5. wavelength tunable laser system according to claim 3 is characterized in that:
Described Etalon places on the B thermoelectric (al) cooler, and at the B thermoelectric (al) cooler B temperature sensor is installed, the 3rd input of the output access microprocessor of B temperature sensor, and the 4th output of microprocessor connects B thermoelectric (al) cooler temperature control circuit.
6. wavelength tunable laser system according to claim 3 is characterized in that:
Described direction monitor photodiode array is n * n photodiode array, and n is 2 or 3 or 4, and array is symmetrical structure.
7. wavelength tunable laser system according to claim 3 is characterized in that:
Described microprocessor is connected with the external control unit, and the external control unit is man-machine interface, and/or is the remote control that connects by wire and wireless.
8. the control method of wavelength tunable laser system according to claim 3 is characterized in that comprising the steps:
Native system output wavelength scope is set in I, external control unit, the theoretical accounting temperature that microprocessor is set wavelength according to feedback signal and the A thermoelectric (al) cooler of the A temperature sensor on the A thermoelectric (al) cooler, produce the error command signal of control A thermoelectric (al) cooler temperature control circuit, the preliminary temperature of adjusting the A thermoelectric (al) cooler, the Distributed Feedback Laser output wavelength is adjusted roughly, made it near requirement;
II, microprocessor are according to the setting working temperature of temperature feedback signal and the Etalon of the B temperature sensor on the B thermoelectric (al) cooler, produce the error command signal of control B thermoelectric-cooled actuator temperature, through the 4th output access B thermoelectric (al) cooler circuit, the temperature of adjusting the B thermoelectric (al) cooler is the working temperature that Etalon sets, and forms the real time temperature closed-loop control of Etalon;
III, microprocessor are further adjusted the A thermoelectric (al) cooler according to the feedback information of efficiency of transmission again, thereby the Distributed Feedback Laser output wavelength are carried out trickle adjustment; Microprocessor read direction monitor photodiode array output electrical signals I
1Reflection Output of laser power, the output electrical signals I of wavelength lock photodiode
2Then reflect the Output of laser power after the Etalon transmission, calculate the efficiency of transmission T=I of Etalon
2/ I
1Obtained the information of the optical maser wavelength of current output by the wavelength/frequency response characteristic of Etalon efficiency of transmission T, temperature feedback signal according to A temperature sensor on this wavelength information and the A thermoelectric (al) cooler, microprocessor produces the error command signal of control A thermoelectric-cooled actuator temperature, drive control A thermoelectric (al) cooler circuit through the second output, form the real-time closed-loop control of wavelength locking;
IV, microprocessor is according to the power signal of outbound course monitor photodiode array feedback, the M spectrometer, the laser power value of the ratio of the light splitting of N spectrometer and setting, produce the command signal electric current of control Distributed Feedback Laser, through the first output access control Distributed Feedback Laser circuit, and/or produce controlling party to the command signal electric current of control mirror, driving mechanism through the 3rd output access direction control mirror, regulate direction control mirror, control each DFB laser module output beam and enter the coupling of transmission light path, thereby realize that control Output of laser power keeps constant, forms the real-time closed-loop control of Distributed Feedback Laser power.
9. the control method of wavelength tunable laser system according to claim 8 is characterized in that:
When a plurality of DFB laser module arrays are in respectively on a plurality of A thermoelectric (al) coolers, the A thermoelectric (al) cooler of each DFB laser module array is separately installed with the A temperature sensor, the first output of microprocessor is selected the corresponding DFB laser module of current required wavelength of transmitted light through P multichannel switching controls module, the second output of microprocessor is through the residing A thermoelectric (al) cooler of this DFB laser module of Q multichannel switching controls module controls temperature control circuit, and the first input end of microprocessor receives the temperature information of the A temperature sensor of this thermoelectric (al) cooler through R multichannel switching controls module.
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