CN1588151A - Multiple wave length simultaneously exciting erbium blended optical fiber laser working and room temperature - Google Patents
Multiple wave length simultaneously exciting erbium blended optical fiber laser working and room temperature Download PDFInfo
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- CN1588151A CN1588151A CNA2004100690408A CN200410069040A CN1588151A CN 1588151 A CN1588151 A CN 1588151A CN A2004100690408 A CNA2004100690408 A CN A2004100690408A CN 200410069040 A CN200410069040 A CN 200410069040A CN 1588151 A CN1588151 A CN 1588151A
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 51
- 229910052691 Erbium Inorganic materials 0.000 title claims description 12
- UYAHIZSMUZPPFV-UHFFFAOYSA-N erbium Chemical compound [Er] UYAHIZSMUZPPFV-UHFFFAOYSA-N 0.000 title claims description 12
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Abstract
The invention relates to a multiwavelength simultaneously-exciting erbium-doped optical fiber laser working in green house, composing an annular optical cavity by an erbium-doped optical-fiber amplifier, an output coupler and a comb filter, and its characteristic: at least an high-nonlinear optical fiber segment is inserted in the annular optical cavity. Its structure synthetically uses the advantages of high gain and high pumping converting efficiency of erbium-doped optical fiber and the character of energy diffusion from high-power wavelength to low-power wavelength in high-nonlinear optical fiber, caused by parameter four-wave frequency mixing, to effectively prohibit uniform widening characteristic of the erbium-doped optical fiber and realize simultaneous excitation of multiwavelength in the green house.
Description
Technical field
The invention belongs to laser technology field, particularly the erbium doped fiber laser structural design of multi-wavelength simultaneous lasing.
Background technology
Current, wavelength-division multiplex (WDM) technology has become the mainstream technology of long haul communication main line and optical-fiber network.Wavelength-division multiplex technique is exactly in order to make full use of the bandwidth resources of optical fiber low loss window, a plurality of wavelength optical signals to be grouped together to transmit in an optical fiber, and therefore, multiple wavelength laser light source is indispensable.Traditional multi-wavelength signals source is formed by a series of single wavelength dfb semiconductor laser instrument combinations, and technology is simple relatively, and shortcoming is that system is huge, cost is high, and problem is just more outstanding when consideration has the optical-fiber network of optical switch node.From simplied system structure, be convenient to operation maintenance and the angle that reduces cost is considered, especially in the occasion of system unit debugging or component testing, the LASER Light Source that can provide a plurality of wavelength outputs simultaneously has very big advantage.In addition, the broadband multiple-wavelength laser also has a wide range of applications at the light sensory field.
At this application target, people have done many researchs.People such as Rie Hayashi are in being entitled as in " 16-Wavelength 10-GHzActively Mode-Locked Fiber Laser With Demultiplexed Outputs Anchored on theITU-T Grid " article of delivering on photon technology wall bulletin (IEEE Photonics Technology Letters) in Dec, 2003, the Er-doped fiber that employing is cooled to liquid nitrogen temperature (77K) is a gain media, adopt circulator, the feedback loop that lithium niobate external modulator etc. constitute is as an end of resonator cavity, reflectivity is 90% waveguide array as the other end of resonator cavity simultaneously also as wavelength selector, has realized 16 wavelength simultaneously, repetition rate 10GHz, the mode locking pulse output of wavelength interval 100GHz.Adopt Er-doped fiber to realize that a fatal problem of multi-wavelength output is, Er-doped fiber belongs to even broadening medium, only just may realize multi-wavelength stable oscillation stationary vibration simultaneously under very low temperature, and this will be a very big problem in practical occasion.
K.Cheng, in international optical communication annual meeting (OFC ' 2003) in 2003, delivered the article that is entitled as " All-FiberRoom Temperature Multi-Frequency Laser with Ultra Low Cavity Loss " Deng the people, reported in the Er-doped fiber resonator cavity and to have introduced acousto-optic shift frequency mechanism, be used in combination and fuse the biconical fiber comb filter and gain flattening filter has at room temperature realized multi-wavelength output.What people such as Yong Wook Lee delivered on photon technology wall bulletin (IEEE Photonics Technology Letters) in January, 2004 is entitled as in " Multiwavelength-Switchable SOA-Fiber Ring Laser Based onPolarization-Maintaining Fiber Loop Mirror and Polarization Beam Splitter " article, reported that employing semi-conductor amplifier (SOA) makes gain media, adopt polarization maintaining optical fibre tore of reflection mirror and polarizing beam splitter etc. to constitute comb filter, realized 17 wavelength outputs under the room temperature.People such as Nam Seong Kim are in the article " CW Depolarized Multiwavelength RamanFiber Ring Laser with over 58 channels and 50GHz Channel spacing " that international optical communication annual meeting in 2002 (OFC ' 2002) is delivered, the Raman gain that report adopts the long dispersion compensating fiber of 16km (DCF) of 6 diode-end-pumpeds of 3 wavelength to obtain, adopt the fiber F-P adjustable filter to select element as wavelength, realized the nearly output of 58 wavelength on ring cavity structure, the wavelength interval is 50GHz.Adopt semiconductor SOA or Raman gain, perhaps adopt the method for acousto-optic shift frequency can overcome even broadening problem, at room temperature just can realize multi-wavelength oscillation.But semiconductor SOA is not full optical fibre device, and coupling loss is bigger than normal, and output power is restricted; Raman gain coefficienct is less, general long fiber lengths and the bigger pump power of requiring, and this improvement to output characteristics has very big restriction; And adopt the way of acousto-optic shift frequency that harshness or the like is compared in the requirement of equipment.On the other hand, adopt the Fiber-optic parameter gain can realize that also multi-wavelength vibrates simultaneously, the parametric gain coefficient ratio Raman gain coefficienct of same fibre is high slightly, but the requirement aspect the quality of phase matching and pump light requires height than Raman gain, at present also in conceptual phase.In a word, up to the present, realize that simultaneously the technology of the laser instrument of multi-wavelength output still can not satisfy demands of applications.
Summary of the invention
The present invention is in order to overcome the weak point of prior art, a kind of ring cavity erbium doped fiber laser of new construction is proposed, this structure is introduced the mechanism of parametric four-wave mixing in ring cavity, utilize this mechanism can suppress the even spreading characteristic of Er-doped fiber, at room temperature just can realize multi-wavelength simultaneous lasing.The present invention only need introduce one section passive highly nonlinear optical fiber, and is simple in structure, realizes easily.
The erbium doped fiber laser of the multi-wavelength simultaneous lasing of a kind of working and room temperature that the present invention proposes, connect and compose the loop laser chamber by Erbium-Doped Fiber Amplifier (EDFA), output coupler and comb filter, it is characterized in that, in this loop laser chamber, insert one section highly nonlinear optical fiber at least.
Described Erbium-Doped Fiber Amplifier (EDFA) has multiple commercial product available at present, C-band amplifier for example, and L-band amplifier or C+L band amplifier can be selected according to the desired wavelength band of the application target of multiple-wavelength laser.
The existing at present commercial product of described highly nonlinear optical fiber is available.The zero-dispersion wavelength of highly nonlinear optical fiber should be selected near the gain wavelength scope of Er-doped fiber.
Described comb filter can adopt accomplished in many ways such as fusing biconical fiber, birefringence fiber ring mirror, Fabry-Perot-type cavity, is the technology of optoelectronic areas comparative maturity, generally adopts in various multiple-wavelength lasers.At present existing commercial product is available.
Described output coupler is a conventional products.
Principle of work of the present invention:
The basic structure of the room temperature Multiwavelength Erbium-doped Fiber Laser that the present invention proposes as shown in Figure 1.This is a ring cavity structure, and being linked to each other one by one with comb filter 13 by Erbium-Doped Fiber Amplifier (EDFA) 11, output coupler 12, highly nonlinear optical fiber 14 constitutes.With the difference of common ring cavity erbium doped fiber laser be to have inserted one section highly nonlinear optical fiber and a comb filter, and comb filter generally adopts in the multiple-wavelength laser that other method realizes.Contain optoisolator in the Erbium-Doped Fiber Amplifier (EDFA), so the light in the chamber can only unidirectional operation.Ultimate principle according to laser instrument, in common ring cavity erbium doped fiber laser, (promptly from structure shown in Figure 1, remove high non-linear light fibre and comb filter), laser generation at first in the cavity loss minimum, generally be that the maximum wavelength place of Erbium-Doped Fiber Amplifier (EDFA) gain produces.In the actual conditions, even the Erbium-Doped Fiber Amplifier (EDFA) in the ring cavity has adopted the flat gain filtering measures, the gain at each wavelength place also can not be identical, and laser generation will generally be multimode oscillation at the at first starting oscillation of the highest wavelength place that gains.If there is the more approaching maximal value of several sizes in the gain spectral of Er-doped fiber, vibration might take place simultaneously at these maximal value places, and promptly several wavelength may vibrate simultaneously.But there is competition in the even spreading characteristic decision by Er-doped fiber between the pattern that takes place to vibrate, and rises one after another, and is very unstable.
When add comb filter and highly nonlinear optical fiber in ring cavity after, on the one hand, the wavelength that vibration takes place also will be subjected to the influence that wave filter sees through the peak simultaneously except the influence that is subjected to the Erbium-Doped Fiber Amplifier (EDFA) gain maximum.Could vibrate at the wavelength of wave filter again when having only gain, but this does not change the situation of vying each other between multimode oscillation and the pattern through the place, peak than Datong District.On the other hand, parametric four-wave mixing takes place after entering highly nonlinear optical fiber in the light of different wave length, the result of mixing makes luminous power shift to lower-powered wavelength from the bigger wavelength of power, promptly originally the little wavelength of power obtained gain and originally high-power wavelength be subjected to loss (negative gain).If the wavelength that obtains gaining drops on seeing through in the peak of comb filter, just can enter Er-doped fiber once more and as input signal light, obtain the gain of Er-doped fiber, this gain process consumes the last energy level population in the Er-doped fiber, and the vibration that takes place is the earliest had a kind of effect that slackens.Through after the circulation repeatedly, the power of each wavelength reaches a kind of balance in the chamber in, and all that gains and to be enough to overcome the wavelength of loss and can to keep vibration.Therefore, generally the even spreading characteristic of Er-doped fiber is suppressed, and stable simultaneously sharp the penetrating of multi-wavelength is achieved under the room temperature.
The technical indicator of weighing multiple-wavelength laser has: difference (fluctuating quantity), output power, extinction ratio and the wavelength interval of the wavelength coverage of output wave long number, covering (bandwidth), each wavelength power, the line width of each wavelength etc.Wherein Guan Jian technical indicator is wavelength coverage, fluctuating quantity and the extinction ratio that covers.Theoretical and experimental studies results proves that the wavelength coverage of covering depends primarily on the flat gain bandwidth of Erbium-Doped Fiber Amplifier (EDFA), and the flat gain bandwidth of amplifier is wide more, and the covering wavelength coverage that may reach is big more.The contrast of extinction ratio and comb filter is relevant, but depends primarily on amplified spontaneous emission (ASE) substrate of Erbium-Doped Fiber Amplifier (EDFA) output.And fluctuating quantity is except relevant with the flat gain bandwidth of amplifier, depends primarily on the parametric four-wave mixing gain that the light of each wavelength obtains in highly nonlinear optical fiber, because this four-wave mixing is the key that realizes the multi-wavelength stable vibration.In theory, under logarithmic coordinate, fluctuating quantity becomes negative linear relationship with the product of three amounts of nonlinear factor and effective length of the average power density of importing highly nonlinear optical fiber, highly nonlinear optical fiber, will prove this point below by embodiment.
Therefore, when big and fluctuating quantity is as far as possible little when the wavelength coverage that requires multi-wavelength output to cover, the characteristic that the Erbium-Doped Fiber Amplifier (EDFA) of selecting should have a gain spectrum flattening to be guaranteeing wide flat gain bandwidth, be enough to overcome under the prerequisite of cavity loss the locking gain should be low as far as possible and output power is big.Gain is low can to make the extinction ratio height of the multiwavelength laser of the low and output of ASE substrate, and power helps reducing fluctuating quantity greatly and improves output power.Highly nonlinear optical fiber also should require the nonlinear factor height except requiring zero-dispersion wavelength near the gain wavelength of Er-doped fiber, and chromatic dispersion is little, and chromatic dispersion gradient is smooth as far as possible.Simultaneously, the length of highly nonlinear optical fiber does not make the ring cavity total losses can suitably extend above under the prerequisite of amplifier gain, and the highly nonlinear optical fiber that adopts existing product is generally about 500m～2000m, to produce enough strong parametric four-wave mixing.The wavelength interval of comb filter is depended in the wavelength interval of output multiwavelength laser, covers after the decision of wavelength coverage and wavelength interval, and the output wave long number is just definite.The line width of multi-wavelength output and the width of comb filter each " tooth " have much relations, and the line width of the laser of vibration output generally can be littler than the broadband of " tooth ".Therefore the parameters such as wavelength coverage, wavelength interval and facewidth degree of comb filter can be determined according to application requirements.
From realizing the target of multi-wavelength stable vibration, Erbium-Doped Fiber Amplifier (EDFA), output coupler, highly nonlinear optical fiber and comb filter can be connected in any order in the ring cavity.But, when the power proportions of output than higher the time, if output coupler is placed on the input end of highly nonlinear optical fiber, can influence the power density that is input to highly nonlinear optical fiber; Therefore and when power density ratio was higher, the four-wave mixing process in the highly nonlinear optical fiber can make the spectral line broadening of single wavelength, if output coupler is placed on the line width that the output terminal of highly nonlinear optical fiber might slightly be widened.These fine distinctions can be selected or compromise according to the requirement of using.
Characteristics of the present invention and effect:
Structure composition of the present invention has utilized the parametric four-wave mixing effect causes in the Er-doped fiber gain is high, pump conversion efficiency is high advantage and the highly nonlinear optical fiber energy from the characteristics of high-power wavelength to the diffusion of low-power wavelength, effectively suppress the even spreading characteristic of Er-doped fiber, at room temperature realized multi-wavelength simultaneous lasing.
Description of drawings
Fig. 1 is the theory structure synoptic diagram of the Multiwavelength Erbium-doped Fiber Laser of the present invention's proposition;
Fig. 2 is the embodiment of the invention one, C-band broadband Multiwavelength Erbium-doped Fiber Laser Experimental equipment;
Fig. 3 is the embodiment of the invention one, the C-band broadband multi-wavelength output laser spectrum that at room temperature measures;
Output laser spectrum fluctuating quantity and highly nonlinear optical fiber input general power, the nonlinear factor of highly nonlinear optical fiber and the relation non-linear effective length product between of Fig. 4 for obtaining at measurement device shown in Figure 2;
Fig. 5 is the embodiment of the invention two, C+L wave band broadband Multiwavelength Erbium-doped Fiber Laser Experimental equipment;
Fig. 6 is the embodiment of the invention two, the C+L wave band multi-wavelength output laser spectrum that at room temperature measures.
Embodiment
The erbium doped fiber laser of the room temperature broadband multi-wavelength simultaneous lasing that the present invention is proposed reaches accompanying drawing in conjunction with the embodiments and is described in detail as follows:
Embodiment one, and the erbium doped fiber laser structure of multi-wavelength simultaneous lasing as shown in Figure 2 under the room temperature.Erbium-Doped Fiber Amplifier (EDFA) 21, variable optical attenuator 251, coupling ratio are that 10: 90 directional coupler 22, highly nonlinear optical fiber 24, comb filter 23 and variable optical attenuator 252 connects and composes the loop laser chamber in order successively.Wherein, the common port 221 of directional coupler links to each other with variable optical attenuator 251, and 90% end 223 links to each other with highly nonlinear optical fiber 24, and 10% end 222 is the output terminal of ring cavity.Erbium-Doped Fiber Amplifier (EDFA) has the automatic smooth lock function of gain spectral, and gain wavelength covers C-band scope, flat gain 24dB, peak power output 18dBm.Long 1450 meters of highly nonlinear optical fiber, zero-dispersion wavelength is at 1548nm, and 1550nm place chromatic dispersion gradient is 0.0155ps/nm
2Km, nonlinear factor are 11.9W
-1Km
-1, loss factor is 0.73dB/km.Comb filter is a Sagnac interference ring wave filter that utilizes high birefringence optical fiber to constitute, and the gap periods at filtering peak is 0.31nm.Coupling ratio is that 10: 90 directional coupler makes in the chamber 10% light be coupled output, and all the other light of 90% feed back in the chamber.Variable optical attenuator 251 is used to adjust the watt level that enters highly nonlinear optical fiber, and variable optical attenuator 252 is used to regulate the total losses in chamber, the power level that Erbium-Doped Fiber Amplifier (EDFA) is got back in feasible vibration remains within the locking input range of amplifier, to obtain the impartial multiwavelength laser output of each wavelength power ratio.During actual the use, can realize this adjustment by the coupling ratio, gain of EDFA level and the input dynamic range that change directional coupler 22, at this moment, 251 and 252 can cancel.
The output spectrum that present embodiment obtains at measurement of output end with spectrometer as shown in Figure 3.81 wavelength laser outputs are arranged in the wavelength coverage from 1539.28nm to 1564.02nm, and the wavelength interval is 0.31nm, by the wavelength interval decision of used comb filter.The illustration of Fig. 3 enlarges and has shown in 81 output wavelengths a few, can see that the output spectral line of each wavelength is unconventional whole, in fact also highly stable.Can also see that by illustration the extinction ratio of output laser line is near 30dB, obviously greater than the contrast of the about 20dB of comb filter.In the output spectrum shown in Figure 3, the output power level of each wavelength has certain difference, and is higher near near the power ratio wavelength 1543nm and the 1555nm, approximately will hang down 7dB near the middle 1547nm.This gains slightly height by Erbium-Doped Fiber Amplifier (EDFA) near 1543nm and 1555nm and laser generation begins to cause at first there.Fig. 4 represents to sum up the power fluctuation degree of the multiple-wavelength laser output spectrum obtain and the input general power of highly nonlinear optical fiber, the nonlinear factor and the non-linear effective length product P of highly nonlinear optical fiber according to experimental data
Totγ L
EffBetween relation, here, gain fluctuation is defined as the difference power of output power maximal value and intermediate recess place minimum value, represents with dB.The curve shows of Fig. 4 increases input general power, the nonlinear factor of highly nonlinear optical fiber or the power fluctuation that length helps reducing each wavelength in the output spectra of highly nonlinear optical fiber.Need to prove that in measuring experimental data process shown in Figure 4, the wavelength coverage of covering does not become all the time, if will import general power divided by the wavelength coverage that covers, can obtain fluctuating quantity and average power density also has similar negative linear relationship.In addition, non-linear effective length is relevant with the physical length and the loss factor of optical fiber, and for the optical fiber of equal length, loss is big more, and effective length is short more.
Embodiment two, and the erbium doped fiber laser structure of C+L wave band broadband multi-wavelength simultaneous lasing as shown in Figure 5 under the room temperature.Different with structure shown in Figure 2 is that the Erbium Doped Fiber Amplifiers EDFAs that present embodiment uses is amplified by C-band and two branches of L-band amplification compose in parallel.Wherein, C-band branch is made up of with the variable optical attenuator 551 that links to each other with its input end a C-band Erbium-Doped Fiber Amplifier (EDFA) 511, and L-band branch is linked in sequence by a long wave loss device 56, variable optical attenuator 552 and a L-band Erbium-Doped Fiber Amplifier (EDFA) 512 and constitutes.Two branches are connected in parallel by two C+L wave division multiplex couplers 521 and 522 and constitute the amplification combination of C+L broadband.The C+L broadband is amplified combination, highly nonlinear optical fiber 54, comb filter 53 and 10: 90 directional couplers 523 and is connected and composed the loop laser chamber in order successively.5212 ends of C+L wave division multiplex coupler 521 link to each other with long wave loss device 56 with variable optical attenuator 551 respectively with 5213 ends.5211 ends with link to each other with 5233 (90%) of 10: 90 directional couplers 523.5222 ends of C+L wave division multiplex coupler 522 link to each other with the output terminal of C-band Erbium-Doped Fiber Amplifier (EDFA) 511 and the output terminal of L-band Erbium-Doped Fiber Amplifier (EDFA) 512 respectively with 5223 ends.5221 ends link to each other with highly nonlinear optical fiber 54.Comb filter 53 links to each other with common port 5231 ends of 10: 90 directional couplers 523, and 5232 (10%) is the output terminal of ring cavity.
Two Erbium-Doped Fiber Amplifier (EDFA)s of C-band and L-band all have the automatic smooth lock function of gain spectral, and flat gain is 24dB, and peak power output separately is 18dBm.Long wave loss device 56 is devices that utilize curved fiber to make, and the loss of light is increased with wavelength lengthy.Used identical of used highly nonlinear optical fiber and Fig. 2.Comb filter is that (Micron Optics Inc), covers C and L-band to a product wave filter based on the F-P chamber simultaneously, and wavelength interval 0.8nm inserts loss 2dB, contrast 28dB.Variable optical attenuator 551 and 552 is used for adjusting respectively the power level that enters C-band and L-band Erbium-Doped Fiber Amplifier (EDFA), to obtain smooth as far as possible multi-wavelength output laser spectrum.
If the output power of Erbium-Doped Fiber Amplifier (EDFA) is enough big, long wave loss device 56 is also nonessential.In addition, variable optical attenuator 551 and 552 loss also can reduce even cancel.But under the experiment condition of present embodiment, Erbium-Doped Fiber Amplifier (EDFA) 511 and 512 peak power output are limited, and 512 output spectra is quite smooth so that initial vibration when 4 wavelength can be arranged nearly, the result causes the power spectrum that is input to highly nonlinear optical fiber 54 to spend low and can not reach desired parametric four-wave mixing effect, and promptly the power difference of each wavelength is bigger in the multiwavelength laser of the output spectrum.The introducing of long wave loss device 56 adds the appropriate adjustment of variable optical attenuator 552, makes the long wavelength's of L-band part vibration be suppressed and the part power of shorter wavelength is concentrated relatively, obtains more smooth spectrum output at last.
The output spectrum figure that the C+L wave band broadband multi-wavelength that the embodiment of being two shown in Figure 6 measures vibrates simultaneously.Output spectra has the output of 30 wavelength in the scope from 1539.53nm to 1562.79nm, 20 wavelength outputs are arranged in the scope from 1567.69nm to 1583.44nm, and the wavelength interval is 0.8nm.Use spectrometer under the condition of resolution, measure as 0.01nm single wavelength in the output spectrum-the 10dB live width is 0.0432nm, and is obviously narrow than the original live width of comb filter (0.0844nm).The extinction ratio of output spectra is greater than 33dB, and also the contrast (28dB) than comb filter is high, and what output was described is to vibrate to swash to penetrate output really.
Claims (1)
1, a kind of erbium doped fiber laser of multi-wavelength simultaneous lasing of working and room temperature, connect and compose the loop laser chamber by Erbium-Doped Fiber Amplifier (EDFA), output coupler and comb filter, it is characterized in that, in this loop laser chamber, insert one section highly nonlinear optical fiber at least.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100444480C (en) * | 2007-02-05 | 2008-12-17 | 北京交通大学 | Ring tunable single-frequency single-polarization fiber laser |
| CN101320884B (en) * | 2008-06-13 | 2010-08-25 | 华中科技大学 | Double wavelength single longitudinal mode optical fiber laser |
| CN103199419A (en) * | 2013-04-15 | 2013-07-10 | 华中科技大学 | Multi-wavelength fiber laser based on carbon nano tube positive dispersion area locked mode |
| CN104614062A (en) * | 2015-01-23 | 2015-05-13 | 哈尔滨工业大学深圳研究生院 | Distributed ultrasonic sensor based on multi-wavelength Er-doped fiber laser |
| CN111227797A (en) * | 2020-01-15 | 2020-06-05 | 电子科技大学 | Nonlinear effect enhanced sweep frequency light source |
-
2004
- 2004-07-16 CN CNA2004100690408A patent/CN1588151A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100444480C (en) * | 2007-02-05 | 2008-12-17 | 北京交通大学 | Ring tunable single-frequency single-polarization fiber laser |
| CN101320884B (en) * | 2008-06-13 | 2010-08-25 | 华中科技大学 | Double wavelength single longitudinal mode optical fiber laser |
| CN103199419A (en) * | 2013-04-15 | 2013-07-10 | 华中科技大学 | Multi-wavelength fiber laser based on carbon nano tube positive dispersion area locked mode |
| CN104614062A (en) * | 2015-01-23 | 2015-05-13 | 哈尔滨工业大学深圳研究生院 | Distributed ultrasonic sensor based on multi-wavelength Er-doped fiber laser |
| CN104614062B (en) * | 2015-01-23 | 2017-09-22 | 哈尔滨工业大学深圳研究生院 | A kind of distributed ultrasound sensor based on Multiwavelength Erbium-doped Fiber Laser |
| CN111227797A (en) * | 2020-01-15 | 2020-06-05 | 电子科技大学 | Nonlinear effect enhanced sweep frequency light source |
| CN111227797B (en) * | 2020-01-15 | 2021-06-08 | 电子科技大学 | Nonlinear effect enhanced sweep frequency light source |
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