CN104733988A - MOPA pulse fiber laser based on pulse drive superluminescent diodes - Google Patents
MOPA pulse fiber laser based on pulse drive superluminescent diodes Download PDFInfo
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Abstract
The invention discloses an MOPA pulse fiber laser based on pulse drive superluminescent diodes. The MOPA pulse fiber laser comprises a light path module (1) and a circuit module (2). The light path module (1) comprises an ultra wideband light source (3), a first delay optical fiber (4), a first optical fiber amplification device (5), one or more second optical fiber amplification devices (7), a photoelectric detector (21) and an output isolator (8) which are coaxially and sequentially connected. The circuit module (2) comprises a pumping drive circuit (9), a superluminescent diode drive circuit (10), an output control circuit (11) and a protection circuit (12). By means of the MOPA pulse fiber laser, the pulse drive superluminescent diodes can be effectively protected against damage of reverse lasers, and the service life of the laser is prolonged.
Description
Technical field
The present invention relates to a kind of fiber laser, particularly a kind of MOPA pulse optical fiber based on pulsed drive super-radiance light emitting diode, belongs to laser equipment field.
Background technology
Super-radiance light emitting diode (superluminescent diode, SLD or superluminescent lightemitting diodes, SLED), it is a kind of wide spectral, weak temporal coherence, high-power, high efficiency semiconductor light-emitting device, its optical property is between semiconductor laser (Laser Diode, and semiconductor light-emitting-diode (Light-Emitting Diode LD), LED) between, there is the luminescent spectrum wider than LD and shorter fiber lengths, there is the power output higher than LED, integrate wide spectral and powerful advantage, have a wide range of applications.
Existing pulse optical fiber, feature adds modulation device in resonant cavity, so its laser exported exports in the mode of high energy pulse, the super-radiance light emitting diode of existing fiber laser can be subject to two kinds of reverse laser damages, wherein, the laser of the reverse transfer that a kind of real forward transmission laser produces when there is stimulated Brillouin scattering SBS in the second gain fibre, another kind of have the retroeflection of fraction laser to laser after being applied to material surface during laser process material, and reverse transfer is to SLD seed source.
Summary of the invention
The object of the invention is to, a kind of MOPA pulse optical fiber based on pulsed drive super-radiance light emitting diode is provided, it can available protecting pulsed drive super-radiance light emitting diode from the damage of reverse laser, improve the life-span of laser.
Technical scheme of the present invention: a kind of MOPA pulse optical fiber based on pulsed drive super-radiance light emitting diode SLD, comprises light path module and circuit module, wherein, described light path module comprise coaxially connect successively super-radiance light emitting diode, the first time delay optical fiber, broadband filter, more than 1 the first optical fiber amplifying device, more than 1 the second optical fiber amplifying device, photodetector and output isolator, first time delay optical fiber for increasing reverse laser transmission to time of super-radiance light emitting diode to ensure that reverse laser transmission is in closed condition to super-radiance light emitting diode during super-radiance light emitting diode, described time size is directly proportional to the length of the first time delay optical fiber, circuit module comprises pumping drive circuit, super-radiance light emitting diode drive circuit, output control circuit and protective circuit, pumping drive circuit produces continuous pumping laser for driving the first optical fiber amplifying device and the second optical fiber amplifying device, super-radiance light emitting diode drive circuit produces modulating pulse laser or continuous laser for driving super-radiance light emitting diode, and realize the adjustable of laser pulse pulsewidth according to the difference of signal of telecommunication pulsewidth, output control circuit is used for the pulsewidth being arranged Output of laser by man-machine interface, repetition rate and power, realize the control that laser is exported, protective circuit is used for light path monitoring and protection.
Preferably, described reverse laser comprises the counterpropagation laser of retroreflection laser and the stimulated Brillouin scattering generation acting on material surface.
Preferably, the length L1 of described first time delay optical fiber is specifically obtained by following formula,
Wherein, in pulse period T, the bright dipping time is D, and in air, laser speed is c, and optical fibre refractivity is n, not very drives super-radiance light emitting diode to be L to the fiber lengths of main power-amplifier stage during the first time delay optical fiber length.
Preferably, the first optical fiber amplifying device comprises the first online optical isolator and the first fiber amplifier, and the first fiber amplifier comprises and connects the first pump laser, the first bundling device and the first gain fibre successively; The pumping end of described first bundling device is connected to the first described pump laser, and the first pump laser is electrically connected with pumping drive circuit;
Wherein a kind of situation is, described first fiber amplifier is specially the signal output part that first gain fibre one end is connected to the first bundling device, the other end is connected with rear stage first optical fiber amplifying device or the second optical fiber amplifying device, and the first bundling device signal input part is connected with the first online optical isolator;
Wherein another kind of situation is, first gain fibre one end is connected to the signal output part of the first bundling device, the other end is connected with the online optical isolator of first in the first optical fiber amplifying device at the same level, and the first bundling device signal input part is connected with rear stage first optical fiber amplifying device or the second optical fiber amplifying device.
Preferably, described second optical fiber amplifying device comprises the second online optical isolator and the second fiber amplifier, and the second fiber amplifier comprises the second pump laser, the second bundling device and the second gain fibre that connect successively; The pumping end of described second bundling device is connected to the second described pump laser, and the second pump laser is electrically connected with pumping drive circuit; Second gain fibre is connected with output isolator.
Preferably, described output isolator comprises the second time delay optical fiber and collimated light isolator, and the second time delay optical fiber is used for the pulse laser after power amplification to be transferred to material, and increases the transmission range of part retroreflection laser to super-radiance light emitting diode.
Preferably, the length L of described second time delay optical fiber
3specifically obtained by following formula,
Wherein, pulse semi-width is d, and in air, laser speed is c, and optical fibre refractivity is n, and the fiber lengths of collimated light isolator is L
3.
Wherein a kind of situation is, second fiber amplifier is specially the signal output part that second gain fibre one end is connected to the second bundling device, the other end and rear stage second optical fiber amplifying device or export isolator and be connected, the second bundling device signal input part is connected with the second online optical isolator;
Wherein another kind of situation is, second gain fibre one end is connected to the signal output part of the second bundling device, the other end is connected with the online optical isolator of second in the second optical fiber amplifying device at the same level, the second bundling device signal input part and rear stage second optical fiber amplifying device or export isolator and be connected.
Preferably, super-radiance light emitting diode drive circuit also for modulating the pulse signal of distinct pulse widths different frequency as required, and controls the output waveform of super-radiance light emitting diode.
The pulse that the embodiment of the present invention utilizes pulsed drive super-radiance light emitting diode to realize fiber laser exports; the output of different pulse duration and impulse waveform laser pulse is realized according to the signal of telecommunication pulse duration of super-radiance light emitting diode and the difference of impulse waveform; and protect super-radiance light emitting diode from the damage of reverse laser by time delay optical fiber; the present invention; can available protecting pulsed drive super-radiance light emitting diode from the damage of reverse laser, improve the life-span of laser.
Accompanying drawing explanation
Fig. 1 is the structural frames schematic diagram of the MOPA pulse optical fiber based on pulsed drive super-radiance light emitting diode that the embodiment of the present invention one provides;
Fig. 2 is the schematic diagram of pulse period of providing of the embodiment of the present invention one and bright dipping time;
Fig. 3 is the schematic diagram of the amplification afterpulse shape that the embodiment of the present invention one provides;
Fig. 4 is the structural frames schematic diagram of the MOPA pulse optical fiber based on pulsed drive super-radiance light emitting diode that the embodiment of the present invention two provides;
Fig. 5 is the structural frames schematic diagram of the MOPA pulse optical fiber based on pulsed drive super-radiance light emitting diode that the embodiment of the present invention three provides;
Fig. 6 is the structural frames schematic diagram of the MOPA pulse optical fiber based on pulsed drive super-radiance light emitting diode that the embodiment of the present invention four provides.
Being labeled as in accompanying drawing: 1-light path module, 2-circuit module, 3-super-radiance light emitting diode, 4-first time delay optical fiber, 5-broadband filter, 6-first optical fiber amplifying device, 7-second optical fiber amplifying device, 8-exports isolator, 9-pumping drive circuit, 10-super-radiance light emitting diode drive circuit, 11-output control circuit, 12-protective circuit, the online optical isolator of 13-first, 14-first fiber amplifier, 15-first pump laser, 16-first bundling device, 17-first gain fibre, the online optical isolator of 18-second, 19-second pump laser, 20-second bundling device, 21-second gain fibre, 22-second fiber amplifier, 23-photodetector, 24-second time delay optical fiber, 25-collimated light isolator.
Embodiment
Below in conjunction with drawings and Examples, the art of this patent is further described.
Embodiments of the invention one: as shown in Figure 1, a kind of MOPA pulse optical fiber based on pulsed drive super-radiance light emitting diode, comprises light path module 1 and circuit module 2; Described light path module 1 comprises super-radiance light emitting diode 3, first time delay optical fiber 4, broadband filter 5, first optical fiber amplifying device 6, second optical fiber amplifying device 7, photodetector 23 and the output isolator 8 that coaxially connect successively; Described second optical fiber amplifying device 7 is 2.Whether photodetector 23 is arranged at the second gain fibre 21 and the fusion point place exporting isolator 8, impaired for detecting light path, once optical fiber blows power-off immediately.
Described circuit module 2 comprises pumping drive circuit 9, super-radiance light emitting diode drive circuit 10, output control circuit 11 and protective circuit 12;
Pumping drive circuit 9 produces continuous pumping laser for driving the first optical fiber amplifying device 6 and the second optical fiber amplifying device 7, super-radiance light emitting diode drive circuit 10 produces modulating pulse laser or continuous laser for driving super-radiance light emitting diode 3, and realize the adjustable of laser pulse pulsewidth according to the difference of signal of telecommunication pulsewidth, output control circuit 11 is for arranging the pulsewidth of Output of laser by man-machine interface, repetition rate and power, realize the control exported laser; Protective circuit 12 is for monitoring and protection light path.
Wherein, described reverse laser comprises the counterpropagation laser of retroreflection laser and the stimulated Brillouin scattering generation acting on material surface; in order to protect super-radiance light emitting diode 3 will add the first time delay optical fiber thereafter, ensure that reverse laser transmission is in closed condition to during SLD.The retroreflection laser that obvious stimulated Brillouin scattering produces can retroeflection quickly to super-radiance light emitting diode 3, as long as so it is in closed condition when ensureing that the retroreflection laser of stimulated Brillouin scattering generation is transferred to super-radiance light emitting diode 3.The length L of described first time delay optical fiber 4
1specifically obtained by following formula,
Wherein, in pulse period T, the bright dipping time is D, and as shown in Figure 2, in air, laser speed is c, and optical fibre refractivity is n, not very drives super-radiance light emitting diode (3) to be L to the fiber lengths of main power-amplifier stage during the first time delay optical fiber length.
First optical fiber amplifying device 6 comprises the first online optical isolator 13 and the first fiber amplifier 14, first fiber amplifier 14 and comprises and connect the first pump laser 15, first bundling device 16 and the first gain fibre 17 successively; The pumping end of described first bundling device 16 is connected to the first described pump laser 15, first pump laser 15 and is electrically connected with pumping drive circuit 9;
Wherein, first fiber amplifier 14 is forward pumping mode, first concrete gain fibre 17 one end is connected to the signal output part of the first bundling device 16, the other end is connected with rear stage first optical fiber amplifying device 6 or the second optical fiber amplifying device 7, first bundling device 16 signal input part is connected with the first online optical isolator 13, and advantage is that the signal to noise ratio of amplifier out is higher than backward pumping.
Described second fiber amplifier 22 is forward pumping structure, in forward pumping second fiber amplifier, second gain fibre 21 one end is connected to the signal output part of the second bundling device 20, the other end and rear stage second optical fiber amplifying device 7 or export isolator 8 and be connected, the second bundling device 20 signal input part is connected with the second online optical isolator 18.The advantage of forward pumping second fiber amplifier is that the signal to noise ratio of amplifier out is higher than backward pumping, and stimulated Raman scattering SRS is weaker than backward pumping.
Described second optical fiber amplifying device 7 comprises the second online optical isolator 18 and the second fiber amplifier 22, second fiber amplifier 22 comprises the second pump laser 19, second bundling device 20 and the second gain fibre 21 connected successively; The pumping end of described second bundling device 20 is connected to the second described pump laser 19, second pump laser 19 and is electrically connected with pumping drive circuit 9; Second gain fibre 21 is connected with output isolator 8.Described first gain fibre 17 and the second gain fibre 21 are yb-doped double-clad fiber.
Preferably, described output isolator 8 comprises the second time delay optical fiber 24 and collimated light isolator 25, second time delay optical fiber 24 is for being transferred to material by the pulse laser after power amplification, and increase the transmission range of part retroreflection laser to super-radiance light emitting diode 3, when each impulse action of laser can be made to return laser to material surface back reflection, pulse front edge peak power higher position staggers therewith, avoids reflected light to cause damage to laser.
Wherein, because MOPA laser amplifies afterpulse shape as shown above, in order to the pulse front edge tip portion after preventing main power amplification be applied to material surface retroeflection to gain fibre after be reversed amplification and cause the too high damage optical fiber of peak value, we with the addition of the second time delay optical fiber between the second gain fibre and collimated light isolator again, mainly in order to the pulse of forward transmission when preventing the part retroreflection laser at pulse front edge tip to be transferred to the second gain fibre has been in the lower state of peak power.Consider that the long threshold value of stimulated Raman scattering that also can cause of energy-transmission optic fibre declines, so the second time delay optical fiber 24 is also unsuitable long simultaneously.The length L of the second time delay optical fiber 24
3specifically obtained by following formula,
Wherein, pulse semi-width is d, and as shown in Figure 3, in air, laser speed is c, and optical fibre refractivity is n, and the fiber lengths of collimated light isolator is L
3.
Preferably, super-radiance light emitting diode drive circuit (10) also for modulating the pulse signal of distinct pulse widths different frequency as required, and controls the output waveform of super-radiance light emitting diode (3).Such as in order to suppress the gain of amplifying stage pulse front edge too high, it is low rear along high triangle or trapezoidal pulse signal that super-radiance light emitting diode can be modulated to pulse front edge.
Embodiments of the invention two: as shown in Figure 4, a kind of MOPA pulse optical fiber based on pulsed drive super-radiance light emitting diode, described first fiber amplifier 14 is backward pumping mode, in backward pumping first fiber amplifier, first gain fibre 17 one end is connected to the signal output part of the first bundling device 16, the other end is connected with the online optical isolator 13 of the online optical isolator first of first in the first optical fiber amplifying device 6 at the same level, and the first bundling device 16 signal input part is connected with rear stage first optical fiber amplifying device 6 or the second optical fiber amplifying device 7.The advantage of backward pumping first fiber amplifier is that the gain ability of amplifier is higher than forward pumping.
Described second fiber amplifier 22 adopts forward pumping structure, in forward pumping second fiber amplifier, second gain fibre 21 one end is connected to the signal output part of the second bundling device 20, the other end and rear stage second optical fiber amplifying device 7 or export isolator 8 and be connected, the second bundling device 20 signal input part is connected with the second online optical isolator 18.The advantage of forward pumping second fiber amplifier is that the signal to noise ratio of amplifier out is higher than backward pumping, and stimulated Raman scattering is weaker than backward pumping.
Embodiments of the invention three: as shown in Figure 5, a kind of MOPA pulse optical fiber based on pulsed drive super-radiance light emitting diode, first fiber amplifier 14 is forward pumping mode, in forward pumping first fiber amplifier, first gain fibre 17 one end is connected to the signal output part of the first bundling device 16, the other end is connected with rear stage first optical fiber amplifying device 6 or the second optical fiber amplifying device 7, first bundling device 16 signal input part is connected forward pumping first fiber amplifier advantage with the first isolator 13 is that the signal to noise ratio of amplifier out is higher than backward pumping.
Second fiber amplifier 22 adopts counter-pumping configuration, in backward pumping second fiber amplifier, second gain fibre 21 one end is connected to the signal output part of the second bundling device 20, the other end is connected with the online optical isolator 18 of second in the second optical fiber amplifying device 7 at the same level, the second bundling device 20 signal input part and rear stage second optical fiber amplifying device 7 or export isolator 8 and be connected.The advantage of backward pumping second fiber amplifier is that the gain ability of amplifier is higher than forward pumping, and the amplification degree of Output of laser reflect back into laser is weaker than forward pumping.
Embodiments of the invention four: as shown in Figure 6, a kind of MOPA pulse optical fiber based on pulsed drive super-radiance light emitting diode SLD, first fiber amplifier 14 is backward pumping mode, in backward pumping first fiber amplifier, first gain fibre 17 one end is connected to the signal output part of the first bundling device 16, the other end is connected with the online optical isolator 13 of the online optical isolator first of first in the first optical fiber amplifying device 6 at the same level, and the first bundling device 16 signal input part is connected with rear stage first optical fiber amplifying device 6 or the second optical fiber amplifying device 7.The advantage of backward pumping first fiber amplifier is that the gain ability of amplifier is higher than forward pumping.
Described second fiber amplifier 22 adopts counter-pumping configuration, in backward pumping second fiber amplifier, second gain fibre 21 one end is connected to the signal output part of the second bundling device 20, the other end is connected with the online optical isolator 18 of second in the second optical fiber amplifying device 7 at the same level, the second bundling device 20 signal input part and rear stage second optical fiber amplifying device 7 or export isolator 8 and be connected.The advantage of backward pumping second fiber amplifier is that the gain ability of amplifier is higher than forward pumping, and the amplification degree of Output of laser reflect back into laser is weaker than forward pumping.
Claims (10)
1. based on a MOPA pulse optical fiber for pulsed drive super-radiance light emitting diode, it is characterized in that: comprise light path module (1) and circuit module (2), wherein, described light path module (1) comprises the super-radiance light emitting diode (3) coaxially connected successively, first time delay optical fiber (4), broadband filter (5), first optical fiber amplifying device (6) of more than 1, second optical fiber amplifying device (7) of more than 1, photodetector (23) and output isolator (8), first time delay optical fiber (4) for increasing reverse laser transmission to time of super-radiance light emitting diode (3) to ensure that reverse laser transmission is in closed condition to super-radiance light emitting diode (3) time super-radiance light emitting diode (3), described time size is directly proportional to the length of the first time delay optical fiber (4), circuit module (2) comprises pumping drive circuit (9), super-radiance light emitting diode drive circuit (10), output control circuit (11) and protective circuit (12), pumping drive circuit (9) produces continuous pumping laser for driving the first optical fiber amplifying device (6) and the second optical fiber amplifying device (7), super-radiance light emitting diode drive circuit (10) produces modulating pulse laser or continuous laser for driving super-radiance light emitting diode (3), and realize the adjustable of laser pulse pulsewidth according to the difference of signal of telecommunication pulsewidth, output control circuit (11) is for arranging the pulsewidth of Output of laser by man-machine interface, repetition rate and power, realize the control that laser is exported, protective circuit (12) is for monitoring and protection light path.
2. a kind of MOPA pulse optical fiber based on pulsed drive super-radiance light emitting diode according to claim 1, is characterized in that: described reverse laser comprises the counterpropagation laser of retroreflection laser and the stimulated Brillouin scattering generation acting on material surface.
3. a kind of MOPA pulse optical fiber based on pulsed drive super-radiance light emitting diode according to claim 1, is characterized in that: the length L of described first time delay optical fiber (4)
1specifically obtained by following formula,
Wherein, in pulse period T, the bright dipping time is D, and in air, laser speed is c, and optical fibre refractivity is n, not very drives super-radiance light emitting diode (3) to be L to the fiber lengths of main power-amplifier stage during the first time delay optical fiber length.
4. a kind of MOPA pulse optical fiber based on pulsed drive super-radiance light emitting diode according to claim 1,2 or 3, it is characterized in that: the first optical fiber amplifying device (6) comprises the first online optical isolator (13) and the first fiber amplifier (14), the first fiber amplifier (14) comprises and connects the first pump laser (15), the first bundling device (16) and the first gain fibre (17) successively; The pumping end of described first bundling device (16) is connected to described the first pump laser (15), and the first pump laser (15) is electrically connected with pumping drive circuit (9).
5. a kind of MOPA pulse optical fiber based on pulsed drive super-radiance light emitting diode according to claim 4, it is characterized in that: described first fiber amplifier (14) is specially the signal output part that the first gain fibre (17) one end is connected to the first bundling device (16), the other end is connected with rear stage first optical fiber amplifying device (6) or the second optical fiber amplifying device (7), and the first bundling device (16) signal input part is connected with the first online optical isolator (13);
Or first gain fibre (17) one end be connected to the signal output part of the first bundling device (16), the other end is connected with the online optical isolator (13) of first in the first optical fiber amplifying device (6) at the same level, and the first bundling device (16) signal input part is connected with rear stage first optical fiber amplifying device (6) or the second optical fiber amplifying device (7).
6. a kind of MOPA pulse optical fiber based on pulsed drive super-radiance light emitting diode according to claim 1,2 or 3, it is characterized in that: described second optical fiber amplifying device (7) comprises the second online optical isolator (18) and the second fiber amplifier (22), the second fiber amplifier (22) comprises the second pump laser (19), the second bundling device (20) and the second gain fibre (21) that connect successively; The pumping end of described second bundling device (20) is connected to described the second pump laser (19), and the second pump laser (19) is electrically connected with pumping drive circuit (9); Second gain fibre (21) is connected with output isolator (8).
7. a kind of MOPA pulse optical fiber based on pulsed drive super-radiance light emitting diode according to claim 6, it is characterized in that: the second fiber amplifier (22) is specially the signal output part that the second gain fibre (21) one end is connected to the second bundling device (20), the other end and rear stage second optical fiber amplifying device (7) or export isolator (8) and be connected, the second bundling device (20) signal input part is connected with the second online optical isolator (18);
Or second gain fibre (21) one end be connected to the signal output part of the second bundling device (20), the other end is connected with the online optical isolator (18) of second in the second optical fiber amplifying device (7) at the same level, the second bundling device (19) signal input part and rear stage second optical fiber amplifying device (7) or export isolator (8) and be connected.
8. a kind of MOPA pulse optical fiber based on pulsed drive super-radiance light emitting diode according to claim 1, it is characterized in that: described output isolator (8) comprises the second time delay optical fiber (24) and collimated light isolator (25), second time delay optical fiber (24) for the pulse laser after power amplification is transferred to material, and increases the transmission range of part retroreflection laser to super-radiance light emitting diode (3).
9. a kind of MOPA pulse optical fiber based on pulsed drive super-radiance light emitting diode according to claim 8, is characterized in that: the length L of described second time delay optical fiber (24)
3specifically obtained by following formula,
Wherein, pulse semi-width is d, and in air, laser speed is c, and optical fibre refractivity is n, and the fiber lengths of collimated light isolator is L
3.
10. a kind of MOPA pulse optical fiber based on pulsed drive super-radiance light emitting diode according to claim 1, it is characterized in that: super-radiance light emitting diode drive circuit (10) also for modulating the pulse signal of distinct pulse widths different frequency as required, and controls the output waveform of super-radiance light emitting diode (3).
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| CN107968311A (en) * | 2017-12-21 | 2018-04-27 | 山东大学 | A kind of MOPA pulse optical fibers and its method of work |
| CN109462135A (en) * | 2018-12-26 | 2019-03-12 | 昂纳信息技术（深圳）有限公司 | A kind of the amplification output method and system of optical signal |
| CN110661164A (en) * | 2019-08-23 | 2020-01-07 | 大族激光科技产业集团股份有限公司 | Fiber laser for improving Raman optical threshold |
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