CN205231455U - 1550nm pulsed optical fibre laser ware - Google Patents
1550nm pulsed optical fibre laser ware Download PDFInfo
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- CN205231455U CN205231455U CN201520487738.5U CN201520487738U CN205231455U CN 205231455 U CN205231455 U CN 205231455U CN 201520487738 U CN201520487738 U CN 201520487738U CN 205231455 U CN205231455 U CN 205231455U
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Abstract
The utility model is suitable for a fiber laser technical field provides a 1550nm pulsed optical fibre laser ware, including circuit module and light path module, light path module includes single mode semiconductor laser, triport circulator, a optical fiber amplifier, the 2nd optical fiber amplifier, a optical fiber amplifier with the 2nd optical fiber amplifier same multimode semiconductor laser that shares, a optical fiber amplifier is including connecting gradually ware, first gain fibre and narrowband speculum are restrainted to multimode semiconductor laser, multimode beam splitter and first closing, the pilot light by multimode semiconductor laser sends, the process the multimode beam splitter inserts respectively in advance the amplifier stage with main power amplifier stage, first gain fibre with the second gain fibre is the two cladded fiber of erbium -ytterbium co -doped. Therefore, the utility model provides a 1550nm fiber laser output is low, bulky, the problem of low signal -to -noise ratio.
Description
Technical field
The utility model relates to fiber laser technology field, particularly relates to a kind of 1550nm pulse optical fiber.
Background technology
1550nm wave band is positioned at the 3rd low-loss communication window, this wave band of laser has very strong penetration power to cloud and mist, flue dust, and human eye exceeds four orders of magnitude at the damage threshold of 1550nm wave band than at the damage threshold of 1060nm wave band, so this laser wavelength is also referred to as " eye-safe " laser wavelength.The fields such as optical fiber communication, laser radar, laser ranging, 3D scanning, biomedicine are widely used in by means of its this wave band of laser of above feature.And 1550nm fiber laser because its Threshold pumped power is low, conversion efficiency is high, compact conformation, good heat dissipation communicate with existing fiber and the feature such as optical fiber sensing system is completely compatible, becomes the study hotspot in present laser field.Current commonly er-doped 1550nm pulse optical fiber, MOPA (MasterOscillatorPower-Amplifier can be utilized, master oscillation power amplification) fiber laser of structure, easily there is Cluster Phenomenon in erbium ion wherein, maximum quantum conversion efficiency is low, be difficult to realize high-power output, and be easy to when erbium ion-doped concentration is higher produce concentration quenching thus occur that Energy upconversion causes the problems such as self-pulsing.The power of er-doped 1550nm pulse optical fiber is difficult to improve, but the 1550nm laser of not all power level can meet practical application, so the power level how improving 1550nm pulse optical fiber is a large limiting factor of its further genralrlization application at present, the volume how reducing 1550nm pulse optical fiber in addition further is also urgent problem to improve the signal to noise ratio of its integrated level and raising Output of laser.Common 1550nm erbium and ytterbium codoping laser is all generally adopt two-stage to amplify, the first order adopts erbium-doped single-mode fiber and 980nm single mode semiconductor laser to carry out one-level pre-amplification, the main power-amplifier stage of secondary adopts erbium ytterbium co doped double clad fiber and 975nm multimode semiconductor laser, this structure two-stage is amplified all needs independently drives, 980nm single mode semiconductor laser needs independently temperature control, in circuit, just cannot reach enough miniaturizations.Also have 1550nm flashlight directly to mix through one-level the scheme that amplifier carries out amplifying altogether, but the signal to noise ratio of this scheme is lower, power output is also starkly lower than front a kind of Hybrid amplifier mode.
In summary, obviously there is inconvenience and defect in actual use, so be necessary to be improved in existing laser.
Utility model content
For above-mentioned defect, the purpose of this utility model is to provide a kind of 1550nm pulse optical fiber, the problem such as the power output solving current common 1550nm pulse optical fiber is low, volume is large, signal to noise ratio is low.
To achieve these goals, the utility model provides a kind of 1550nm pulse optical fiber, comprises circuit module and light path module, and described light path module comprises single mode semiconductor laser, three port circulators, the first fiber amplifier, the second fiber amplifier; Described first fiber amplifier and described second fiber amplifier share same multimode semiconductor laser;
Described first fiber amplifier comprise connect successively described multimode semiconductor laser, multimode beam splitter and the first bundling device, the first gain fibre and narrowband reflection mirror, flashlight is sent by described multimode semiconductor laser, then accesses pre-amplification stage and main power-amplifier stage respectively through described multimode beam splitter; Described flashlight is through described first gain fibre, and described narrowband reflection mirror reflects described flashlight, and described flashlight returns and realizes pre-amplification through described first gain fibre again; Described second fiber amplifier comprises described multimode semiconductor laser, described multimode beam splitter, the second bundling device and the second gain fibre, and described first gain fibre and described second gain fibre are erbium ytterbium co doped double clad fibers;
Described three port circulators control optic path direction, and the described flashlight of the first port input only exports from the second port, and the described flashlight of described second port input only exports from the 3rd port.
According to fiber laser described in the utility model, what arrange in described second fiber amplifier structure is backward pumping, described second gain fibre one end is connected with pattern matcher, the other end is connected with the signal output part of described second bundling device, the signal input part of described second bundling device is connected with narrow band filter input, and described single mode semiconductor laser output signal enters described first bundling device through described three port circulators.
According to fiber laser described in the utility model, described three port circulators are 1550nm tri-port circulators, described multimode semiconductor laser is 915nm multimode semiconductor laser, described narrowband reflection mirror is 1550nm narrowband reflection mirror, described single mode semiconductor laser is 980nm single mode semiconductor laser, and described flashlight is 1550nm flashlight.
According to fiber laser described in the utility model, what arrange in described second fiber amplifier structure is backward pumping, described second gain fibre one end is connected with described pattern matcher, the other end is connected with the signal output part of described second bundling device, the signal input part of described second bundling device is connected with described narrow band filter input, and described single mode semiconductor laser output signal enters described first bundling device through described three port circulators.
According to fiber laser described in the utility model, described single mode semiconductor laser pulsewidth is 3ns, and repetition rate is 50000 hertz, and power output is 9 μ W.
According to fiber laser described in the utility model, described second fiber amplifier is provided with forward pumping.
The utility model is formed and amplifying stage and main power-amplifier stage through multimode beam splitter one-to-two by adopting erbium ytterbium co doped double clad fiber and same 915nm multimode semiconductor laser, the unique design such as the special round structure that pre-amplification stage adopts 1550nm circulator and 1550nm narrowband reflection mirror etc. to form, the problem such as the power output solving current common 1550nm pulse optical fiber is low, volume is large, signal to noise ratio is low, achieve the 1550nm pulse optical fiber of a kind of high-output power, small size, high s/n ratio, have using value.
Accompanying drawing explanation
Fig. 1 is 1550nm pulse optical fiber structural representation of the present utility model;
Fig. 2 A is 1550nm pulse optical fiber first preferred embodiment structural representation of the present utility model;
Fig. 2 B is 1550nm pulse optical fiber second preferred embodiment structural representation of the present utility model;
Fig. 3 is one of 1550nm pulse optical fiber first preferred embodiment effect schematic diagram of the present utility model;
Fig. 4 is 1550nm pulse optical fiber first preferred embodiment effect schematic diagram two of the present utility model;
Fig. 5 is one of 1550nm pulse optical fiber second preferred embodiment effect schematic diagram of the present utility model;
Fig. 6 is 1550nm pulse optical fiber second preferred embodiment effect schematic diagram two of the present utility model.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.
In conjunction with illustrating, see Fig. 1, the 1550nm pulse optical fiber 100 that the utility model provides, comprises circuit module 30 and light path module, and described light path module comprises single mode semiconductor laser 3, three port circulator 4, first fiber amplifier 10, second fiber amplifier 20; Described first fiber amplifier 10 and described second fiber amplifier 20 share same multimode semiconductor laser 17;
Described first fiber amplifier 10 comprises the described multimode semiconductor laser 17, multimode beam splitter 16 and the first bundling device 11, first gain fibre 12 and the narrowband reflection mirror 13 that connect successively, and flashlight accesses pre-amplification stage and main power-amplifier stage through described first gain fibre 12 and described multimode semiconductor laser 17 respectively through described multimode beam splitter 16; Described flashlight is through described first gain fibre 12, and described narrowband reflection mirror 13 reflects described flashlight, and described flashlight returns and realizes pre-amplification through described first gain fibre 12 again; Carry out pre-amplification through described first gain fibre 12 twice because described flashlight comes and goes, described narrowband reflection mirror 13 is by noise filtering; Described first gain fibre 12 is erbium ytterbium co doped double clad fibers.
Be more preferably, described 1550nm pulse optical fiber 100 is master oscillation power amplification structures.
The utility model just reduces the volume of laser effectively with unique design, difference from prior art is the pumping source that two-stage is amplified is same multimode semiconductor laser 17, adopts multimode beam splitter 16 to be divided into two bundles to access described pre-amplification stage and described main power-amplifier stage respectively.This design eliminates one-level multimode semiconductor laser and drive circuit thereof, effectively reduce size and the space of circuit board, light path synchronously reduces coiling area, achieves the miniaturization of laser, and volume size is all less than the common 1550nm narrow spaces fiber laser of same power level.
1550nm pulse optical fiber described in the utility model 100 1 specific embodiment, as shown in Figure 2 A, described light path module also comprises the online isolator of the first light 6, the online isolator 9 of narrow band filter 8, second light and exports wire jumper 5;
Described second fiber amplifier 20 comprises described multimode semiconductor laser 17, described multimode beam splitter 16, second bundling device 24 and the second gain fibre 25; Described first gain fibre 25 and described multimode semiconductor laser 17 carry out pre-amplification, and described second gain fibre 25 and described multimode semiconductor laser 17 pairs of flashlights carry out main power amplification;
Described three port circulators 4 control optic path direction, and 2. the described flashlight that 1. the first port inputs only exports from the second port, and 3. the flashlight that 2. described second port inputs only exports from the 3rd port.Being more preferably described second gain fibre is yb-doped double-clad fiber, and described three port circulators 4 are 1550nm tri-port circulators, described multimode semiconductor laser 17 is 915nm multimode semiconductor laser, described narrowband reflection mirror 13 is 1550nm narrowband reflection mirrors, and described flashlight is 1550nm flashlight.
In embodiment of the present utility model, described circuit module 30 comprises seed source pulse driving circuit 38, seed source temperature control circuit 39, pumping row driver circuitry 33, control circuit 31 and protective circuit 32, the non-the utility model core of circuit part does not repeat them here, for the problem that signal to noise ratio after the less amplification of narrow spaces seed source power is lower, secondary is utilized to come and go the first gain fibre 13 to improve gain characteristic and the noise characteristic of the pre-amplification stage of yb-doped double-clad fiber and multimode pumping source, 1550nm flashlight is exaggerated toward returning twice through yb-doped double-clad fiber, be equivalent to add the intensity of flashlight and the length of gain fibre using simultaneously, and narrowband reflection mirror 13 can direct for most noise filtering, effectively increase the signal to noise ratio with amplifying stage, so this structure makes the gain of pre-amplification stage effectively improve and maintains good signal to noise ratio.
Described flashlight carries out main power amplification through described second fiber amplifier 20, through the 8 pairs of noise light filterings of described narrow band filter, then is exported by described output wire jumper 5 after the online isolator of described second light 9.
What the utility model adopted is pre-amplification stage and main power-amplifier stage is all erbium ytterbium co doped double clad fiber, difference is the pumping source that two-stage is amplified is same 915nm multimode semiconductor laser, adopts multimode fiber beam splitter to be divided into two bundles to access pre-amplification stage and main power-amplifier stage respectively.This design eliminates drive circuit and the temperature control circuit of one-level 980nm single mode semiconductor laser, effectively reduce size and the space of circuit board, achieve the miniaturization of laser, laser outward appearance is only the cylinder of diameter 90mm, height is 20mm, and volume size is much smaller than the common lasers of same power level.Be more preferably, the collimater that inner three ports of described three port circulators 4 are arranged is all the collimater of collimator and extender.
Described second fiber amplifier 20 is provided with forward pumping or backward pumping, and introduce backward pumping in the present embodiment, being next arranged on of forward pumping mentioned.The main power amplification of secondary is that conventional forward amplifies and oppositely amplifies two kinds of structures, the advantage that forward amplifies is that the signal to noise ratio of amplifier out is higher than reverse amplification, stimulated Raman scattering (SRS, StimulatedRamanscattering) is weaker than reverse amplification; The advantage of reverse amplification second fiber amplifier is that the gain ability of amplifier is amplified higher than forward.Forward pumping mode and backward pumping mode less in signal power, during amplifier unsaturation, performance is almost identical, and in operate in saturation district, the power conversion efficiency of backward pumping mode is higher, because now amplified spontaneous emission is lower.
As shown in Figure 2 A, what arrange in described second fiber amplifier 20 structure is backward pumping, described second gain fibre 25 one end is connected with pattern matcher 7, the other end is connected with the signal output part of described second bundling device 24, and the signal input part of described second bundling device 25 is connected with described narrow band filter 8 input.
Seed source pulsed drive adjustable pulse width scope is 1ns-100ns repetition rate adjustable extent is 10Hz-1MHz, 1550nm single mode semiconductor fiber laser 3 pulsewidth is 3ns repetition rate when being 50000 hertz, and power output is 9 μ W, through three port circulators 4 the first port 1. after enter the signal end of the first bundling device 11, simultaneously the 915nm multimode semiconductor laser 17 of 10W outputs signal light through the multimode beam splitter 16 of splitting ratio 20:80 and is divided into two, multimode beam splitter 16 output of 20% port is connected with the pumping end of the first bundling device 11, first bundling device 11 is connected with the first gain fibre 12, 1550nm flashlight is by being exaggerated after yb-doped double-clad fiber, oppositely again again amplified by the first gain fibre 12 after being transferred to 1550nm narrowband reflection mirror 13, narrowband reflection mirror 13 is reflected back light path the ase signal in 1550nm flashlight and a small amount of bandwidth range, other most of ASE light is by outputting to outside light path after narrowband reflection mirror 13.3. the 1550nm flashlight of reverse transfer transfers to the online isolator 6 of the first light along the 3rd port after 1550nm tri-port circulator 4, and now the power of 1550nm flashlight is 58mW, and as shown in Figure 3, signal to noise ratio can reach more than 60 decibels to spectrum.Flashlight after pre-amplification continues transmission, main power-amplifier stage adopts counter-pumping configuration, enter into the second gain fibre 25, main power amplification is carried out in this yb-doped double-clad fiber, part ASE noise light is mingled with in flashlight after amplification, further filtering is carried out through 1550nm narrow band filter 8 pairs of ASE noise light again after the second bundling device 14, remaining flashlight and a small amount of noise light export by exporting wire jumper 5 after the online isolator 9 of the second light, it is 910mW that output records average laser power, pulse duration 3ns, repetition rate 50000 hertz, peak power 6.07kW, spectrum as shown in Figure 4, signal to noise ratio can reach about 50 decibels and achieve high-output power, the feature of small size and high s/n ratio.
In another embodiment, as shown in Figure 2 B, what arrange in described second fiber amplifier 20 structure is forward pumping, the signal input part of described second bundling device 26 is connected with pattern matcher 7, the signal output part of described second bundling device 24 is connected with described second gain fibre 25, and described second gain fibre 25 is connected with narrow band filter 8 input.The difference of itself and previous embodiment is moved between the second bundling device 24 and narrow band filter 8 by described second gain fibre 25.
Seed source pulsed drive adjustable pulse width scope is 1ns-100ns repetition rate adjustable extent is 10Hz-1MHz, single mode semiconductor laser 3 pulsewidth is 10ns repetition rate when being 50000 hertz, and power output is 20 μ W, the signal end of the first bundling device 11 is entered after the 1. port of three port circulators 4, simultaneously the 915nm multimode semiconductor laser 17 of 10W outputs signal light through the multimode beam splitter 16 of 20:80 and is divided into two, multimode beam splitter 16 output of 20% port is connected with the pumping end of the first bundling device 11, first bundling device 11 is connected with the first gain fibre 12, 1550nm flashlight is by being exaggerated after yb-doped double-clad fiber, oppositely again again amplified by the first gain fibre 12 after being transferred to narrowband reflection mirror 13, narrowband reflection mirror 13 is the ASE (amplifiedspontaneousemission in 1550nm flashlight and a small amount of bandwidth range, amplified spont-aneous emission) signal reflex recovering light path, other most of ASE light is by outputting to outside light path after speculum 14.3. the 1550nm flashlight of reverse transfer transfers to the online isolator 6 of the first light along the 3rd port after three port circulators 4, and now the power of 1550nm flashlight is 78mW.Flashlight after pre-amplification continues transmission, main power-amplifier stage adopts forward pumping structure, the second gain fibre 25 is entered into after the second bundling device 24, main power amplification is carried out in this yb-doped double-clad fiber, part ASE noise light is mingled with in flashlight after amplification, narrow band filter 8 pairs of ASE noise light again through 1550nm carry out further filtering, remaining flashlight and a small amount of noise light export by exporting wire jumper 5 after the online isolator 10 of the second light, it is 1.02W that output records average laser power, pulse duration 10ns, repetition rate 50000 hertz, peak power 2.04kW, spectrum as shown in Figure 6, signal to noise ratio can reach about 50 decibels.Achieve the feature of high-output power, small size and high s/n ratio.
In sum, the utility model is formed and amplifying stage and main power-amplifier stage through multimode beam splitter one-to-two by adopting erbium ytterbium co doped double clad fiber and same multimode semiconductor laser, the unique design such as the special round structure that pre-amplification stage adopts 1550nm circulator and 1550nm narrowband reflection mirror etc. to form, the problem such as the power output solving current common 1550nm pulse optical fiber is low, volume is large, signal to noise ratio is low, achieve the 1550nm pulse optical fiber of a kind of high-output power, small size, high s/n ratio, have using value.
Certainly; the utility model also can have other various embodiments; when not deviating from the utility model spirit and essence thereof; those of ordinary skill in the art are when making various corresponding change and distortion according to the utility model, but these change accordingly and are out of shape the protection range that all should belong to the claim appended by the utility model.
Claims (5)
1. a 1550nm pulse optical fiber, comprises circuit module and light path module, it is characterized in that, described light path module comprises single mode semiconductor laser, three port circulators, the first fiber amplifier, the second fiber amplifier; Described first fiber amplifier and described second fiber amplifier share same multimode semiconductor laser;
Described first fiber amplifier comprise connect successively described multimode semiconductor laser, multimode beam splitter and the first bundling device, the first gain fibre and narrowband reflection mirror, flashlight is sent by described multimode semiconductor laser, then accesses pre-amplification stage and main power-amplifier stage respectively through described multimode beam splitter; Described flashlight is through described first gain fibre, and described narrowband reflection mirror reflects described flashlight, and described flashlight returns and realizes pre-amplification through described first gain fibre again; Described second fiber amplifier comprises described multimode semiconductor laser, described multimode beam splitter, the second bundling device and the second gain fibre, and described first gain fibre and described second gain fibre are erbium ytterbium co doped double clad fibers;
Described three port circulators control optic path direction, and the described flashlight of the first port input only exports from the second port, and the described flashlight of described second port input only exports from the 3rd port.
2. fiber laser according to claim 1, it is characterized in that, what arrange in described second fiber amplifier structure is backward pumping, described second gain fibre one end is connected with pattern matcher, the other end is connected with the signal output part of described second bundling device, the signal input part of described second bundling device is connected with narrow band filter input, and described single mode semiconductor laser output signal enters described first bundling device through described three port circulators.
3. fiber laser according to claim 1, described three port circulators are 1550nm tri-port circulators, described multimode semiconductor laser is 915nm multimode semiconductor laser, described narrowband reflection mirror is 1550nm narrowband reflection mirror, described single mode semiconductor laser is 980nm single mode semiconductor laser, and described flashlight is 1550nm flashlight.
4. fiber laser according to claim 1, it is characterized in that, described single mode semiconductor laser pulsewidth is 3ns, and repetition rate is 50000 hertz, and power output is 9uW.
5. fiber laser according to claim 1, it is characterized in that, described second fiber amplifier is provided with forward pumping.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520487738.5U CN205231455U (en) | 2015-07-08 | 2015-07-08 | 1550nm pulsed optical fibre laser ware |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520487738.5U CN205231455U (en) | 2015-07-08 | 2015-07-08 | 1550nm pulsed optical fibre laser ware |
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| CN205231455U true CN205231455U (en) | 2016-05-11 |
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| CN201520487738.5U Active CN205231455U (en) | 2015-07-08 | 2015-07-08 | 1550nm pulsed optical fibre laser ware |
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