CN106785836A - A kind of fiber amplifier for suppressing optical fiber laser output intensity noise - Google Patents
A kind of fiber amplifier for suppressing optical fiber laser output intensity noise Download PDFInfo
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- CN106785836A CN106785836A CN201611155233.4A CN201611155233A CN106785836A CN 106785836 A CN106785836 A CN 106785836A CN 201611155233 A CN201611155233 A CN 201611155233A CN 106785836 A CN106785836 A CN 106785836A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06754—Fibre amplifiers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
- H01S3/0941—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a laser diode
Abstract
A kind of fiber amplifier for suppressing optical fiber laser output intensity noise, including the first and second 1480/1550 polarization maintaining optical fibres isolation wavelength division multiplexer, 980nm laser diodes, 980/1550 polarization maintaining optical fibre isolation wavelength division multiplexer, Er-doped fiber, 1480nm laser diodes, polarization maintaining optical fibre wave filter, 1:99 polarization-maintaining fiber couplers, adjustable optic fibre attenuator, photodetector, feedback controller, laser diode drive.Two pump light injection Er-doped fibers of laser diode output, form laser gain, amplify laser power；1480nm pumping wavelengths are added in fiber amplifier, the broadband control to amplifier gain can be realized by part Er ions from ground state level pump-coupling to upper laser level；Using the feedback control loop to laser intensity noise, you can realize effective suppression of and low-frequency noise neighbouring to relaxation oscillation frequency.
Description
Technical field
The present invention relates to the fiber amplifier in photoelectron technical field, and in particular to one kind suppresses optical fiber laser output
The fiber amplifier of intensity noise.
Background technology
Low noise, single-frequency, C-band (wavelength is 1528.77nm~1560.61nm) lasing light emitter of narrow linewidth are in high-rate laser
The fields such as communication, coherent laser detection and Microwave photonics have a wide range of applications.This kind of light source mainly includes semiconductor laser
Device and Er-doped fiber laser.Compared with semiconductor laser, the line width of Er-doped fiber laser is narrower, can reach 1kHz with
It is interior, and the line width of the semiconductor laser of free-running is usually more than 100kHz.But, Er-doped fiber laser is generally present
Stronger intensity noise, the noise is caused by relaxation oscillation, the crest frequency of relaxation oscillation be normally at 200kHz~
2MHz。
For above-mentioned laser intensity noise, can be suppressed using fiber amplifier.D.Q.Pan et al. is proposed to utilize and is mixed Er
The gain saturaition of fiber amplifier suppresses laser intensity noise (Z Q Pan, J Zhou, F Yang, Q Ye, H W
Cai,R H Qu and Z J Fang,Low-frequency noise suppression of a fiber laser
based on a round-trip EDFA power stabilizer,Laser Physics,23(2013),03510501-
03510504) round trip fiber amplifier device, including single frequency optical fiber laser, optical circulator, Er-doped fiber, optical fiber, are disclosed
Wavelength division multiplexer, adjustable optical attenuator, faraday's speculum and pump light source.The laser produced from single frequency optical fiber laser leads to
Cross optical circulator and enter Er-doped fiber, in the presence of pump light source, gain is formed in Er-doped fiber, so as to realize to laser
First time amplify, exaggerated laser is reflected by optical fibre wavelength division multiplexer and adjustable optical attenuator by faraday's speculum
Pass sequentially through adjustable optical attenuator and optical fibre wavelength division multiplexer again afterwards, again from Er-doped fiber is redirected back into, realization is put for the second time
Greatly, exported finally by optical circulator.The fundamental mechanism that the device can suppress laser intensity noise is, by adjusting tunable optical
The insertion loss of attenuator, under specific insertion loss, power output and input power differential of round trip fiber amplifier etc.
It is insensitive in the change of zero, i.e. power output to input power, so as to realize the suppression to exporting laser intensity noise.From experiment
From the point of view of result, the device can produce significant inhibition to the laser intensity noise within 1kHz, and to more than 10kHz's
Noise does not influence significantly then.Therefore, the apparatus and method be difficult to suppress relaxation oscillation frequency (be usually located at 200kHz~
2MHz) intensity noise nearby, and the noise in the frequency range is the main component of optical fiber laser output intensity noise.
Additionally, for the output intensity noise of optical fiber laser, can also be suppressed using semiconductor laser amplifier.China
Team of the Yang Zhong militias proposition of southern Polytechnics, is amplified using semiconductor laser amplifier to laser, and to semiconductor laser
The driving current of amplifier carry out feedback control mode suppress laser intensity noise (Qilai Zhao, Shanhui Xu,
Kaijun Zhou,Changsheng Yang,Can Li,Zhouming Feng,Mingying Peng,Huaqiu Deng,
and Zhongmin Yang,Broad-bandwidth near-shot-noise-limited intensity noise
suppression of a single-frequency fiber laser,Optics Letters,41(2016),1333-
1335).Semiconductor laser amplifier device, including laser diode (LD), polarization-maintaining wavelength division multiplexer have been built by the seminar
(PM-WDM), short cavity optical fiber laser, polarization preserving fiber isolator (PM-ISO), adjustable optical attenuator (VOA), Polarization Controller
(PC), fiber coupling semiconductor optical amplifier (SOA), fiber band-pass filter (BPF), 1:99 fiber couplers, photodetection
The driver of device, low pass filter (LPF), amplifier (AMP) and semiconductor optical amplifier.The 980nm pump lights warp that LD is produced
After crossing PM-WDM, into short cavity optical fiber laser；The 1550nm laser that short cavity optical fiber laser is produced passes through PM-WDM and PM-
After ISO, into VOA, laser power is suitably decayed；SOA is then entered by PC, 1550nm laser powers are put from 4mW
Arrive 17.5mW or so greatly；Laser after amplification passes through BPF again, to filter the spontaneous emission light outside 1550nm；Then pass through 1:
99 fiber couplers, its 99% port as semiconductor laser amplifier delivery outlet, 1% port connection PD, by laser intensity
Fluctuating is converted into electric signal, then by LPF, AMP, is input into the driver of semiconductor optical amplifier, and driver connection SOA is formed
To the feedback control loop of laser intensity noise.Under the inc state of loop, laser by after semiconductor laser amplifier,
Laser intensity noise near relaxation oscillation frequency reduces 50dB or so.In the state of loop closure, further significantly drop
The low low-frequency noise of below 1kHz, makes the laser intensity noise of 0.8kHz to 50MHz be reduced to -150dB/Hz or so.It is above-mentioned
Although preferable noise suppression effect can be obtained by the way of using semiconductor laser amplifier and by feedback control, can
The laser output power for reaching is limited by semiconductor laser amplifier power capacity, the semiconductor of usual Single-Mode Fiber Coupling
Laser amplifier power output is no more than 18dBm (i.e. 63mW).
In a word, the existing gain saturaition by fiber amplifier suppresses the side of the intensity noise of optical fiber laser
Method, is only capable of suppressing low-frequency noise, it is impossible to suppress the noise near relaxation oscillation frequency, and the noise near the frequency is strong laser
Spend the main component of noise.And using semiconductor laser amplifier and by feedback control by the way of, although can obtain preferably
Noise suppression effect, but power output is relatively low.
The content of the invention
The purpose of the present invention is directed to the defect of background technology presence, and research and design is a kind of to suppress optical fiber laser output by force
The fiber amplifier of noise is spent, can effectively suppress relaxation oscillation frequency nearby and low frequency lasers intensity noise, i.e., effectively suppressed
Main component in optical fiber laser output intensity noise, while improving laser output power.
Solution of the invention is directed to background technology can not be while obtain high power and the output of occupational noise laser
Disadvantage, the present invention using include the one 1480/1550 polarization maintaining optical fibre isolation wavelength division multiplexer, the 2nd 1480/1550 polarization-maintaining light
Fibre isolation wavelength division multiplexer, 980nm laser diodes, 980/1550 polarization maintaining optical fibre isolation wavelength division multiplexer, Er-doped fiber,
1480nm laser diodes, polarization maintaining optical fibre wave filter, 1:99 polarization-maintaining fiber couplers, adjustable optic fibre attenuator, photodetector,
The fiber amplifier of feedback controller, laser diode drive, with power capacity higher, can show to laser power
Write and amplify；Also, except conventional 980nm pumping wavelengths, the present invention employs 1480nm pumpings simultaneously in fiber amplifier
Wavelength, by the pumping of the wavelength laser, by part Er ions from ground state level pump-coupling to upper laser level, then can pass through
Quickly relaxing towards up to Laser emission sub- energy level in energy level, is capable of achieving the broadband control to amplifier gain；Using strong to laser
Spend the feedback control loop of noise, you can effective suppression of and low-frequency noise neighbouring to relaxation oscillation frequency is realized, so that can be same
When obtain high power and occupational noise laser output.The operation principle of the fiber amplifier：The output of 980nm laser diodes
980nm pump lights are isolated wavelength division multiplexer and inject Er-doped fiber by 980/1550 polarization maintaining optical fibre, meanwhile, the pole of 1480nm laser two
The 1480nm pump lights of pipe output are isolated wavelength division multiplexer and inject Er-doped fiber by the 2nd 1480/1550 polarization maintaining optical fibre, at it
Middle formation laser gain；Input laser passes sequentially through the isolation of the one 1480/1550 polarization maintaining optical fibre wavelength division multiplexer and 980/1550
Polarization maintaining optical fibre isolates wavelength division multiplexer, then by Er-doped fiber, laser power is amplified；1480nm pump lights by part Er from
Son is somebody's turn to do from ground state level pump-coupling to upper laser level, then by quickly relaxing towards up to Laser emission sub- energy level in energy level
Relaxation time is ns magnitudes so that the modulation bandwidth to laser gain can reach more than 100MHz；By the 2nd 1480/1550 polarization-maintaining
Fiber isolation wavelength division multiplexer, polarization maintaining optical fibre wave filter, 1:99 polarization-maintaining fiber couplers, adjustable optic fibre attenuator, photodetection
Device, feedback controller, laser diode drive, 1480nm laser diodes form the feedback control loop to laser intensity noise
Road, by the gain of feedback control fiber amplifier, then can suppress relaxation oscillation frequency nearby and low frequency lasers intensity noise；This
Invention realizes its goal of the invention with this.
A kind of fiber amplifier for suppressing optical fiber laser output intensity noise proposed by the present invention, it is characterised in that institute
Stating fiber amplifier includes the one 1480/1550 polarization maintaining optical fibre isolation wavelength division multiplexer, the isolation of the 2nd 1480/1550 polarization maintaining optical fibre
Wavelength division multiplexer, 980nm laser diodes, 980/1550 polarization maintaining optical fibre isolation wavelength division multiplexer, Er-doped fiber, 1480nm laser
Diode, polarization maintaining optical fibre wave filter, 1:99 polarization-maintaining fiber couplers, adjustable optic fibre attenuator, photodetector, feedback control
Device, laser diode drive；
The output port of 1480nm laser diodes connects the anti-of the 2nd 1480/1550 polarization maintaining optical fibre isolation wavelength division multiplexer
Port is penetrated, the public port of the one 1480/1550 polarization maintaining optical fibre isolation wavelength division multiplexer connects the isolation of 980/1550 polarization maintaining optical fibre
The straight-through port of wavelength division multiplexer, the one of the common port connection Er-doped fiber of 980/1550 polarization maintaining optical fibre isolation wavelength division multiplexer
End, the other end of Er-doped fiber connects the common port that the 2nd 1480/1550 polarization maintaining optical fibre isolates wavelength division multiplexer, the 2nd 1480/
The straight-through end of 1550 polarization maintaining optical fibres isolation wavelength division multiplexer connects the common port of polarization maintaining optical fibre wave filter, polarization maintaining optical fibre wave filter
Reflection end connection 1:The input of 99 polarization-maintaining fiber couplers, 1:The 1% output port connection of 99 polarization-maintaining fiber couplers is adjustable
One end of fibre optic attenuator, the other end of adjustable optic fibre attenuator is sequentially connected photodetector, feedback controller, the pole of laser two
Pipe driver, 1480nm laser diodes；During work, input laser isolates wavelength-division multiplex from the one 1480/1550 polarization maintaining optical fibre
The straight-through port input of device, exports laser from 1:The 99% output port output of 99 polarization-maintaining fiber couplers.
Fiber amplifier of the present invention uses two laser diode-pumped injection Er-doped fibers of different wave length, wherein,
980nm and 1480nm laser diodes can export power higher, gain higher be formed in Er-doped fiber, with higher
Pumping-laser transformation efficiency, power output (more than 200mW) higher can be obtained；Also, 1480nm laser diodes are exported
Pump light can be by part Er ions from ground state level pump-coupling to upper laser level, then by the quick relaxation in energy level
Reach the sub- energy level of Laser emission, the relaxation time is ns magnitudes so that the modulation bandwidth of laser gain can reach 100MHz with
On；Controlled by the broadband feedback of the gain to fiber amplifier, then can suppress relaxation oscillation frequency nearby and low frequency lasers are strong
Degree noise.Thus the present invention having the characteristics of obtain simultaneously high power and occupational noise laser to export.
Brief description of the drawings
A kind of structural representation of the fiber amplifier of suppression optical fiber laser output intensity noise that Fig. 1 is provided for the present invention
Figure；
Fig. 2 is tradition sensitization pumping (a) and the level structure figure of resonance pumping (b) of Er-doped fiber medium；
In figure：The polarization maintaining optical fibres of 1-1. the 1st isolate wavelength division multiplexer, the polarization-maintaining light of 1-2. the 2nd 1480/1550
Fibre isolation wavelength division multiplexer, 2.980nm laser diodes, 3.980/1550 polarization maintaining optical fibre isolation wavelength division multiplexer 4. mixes Er light
Fibre, 5.1480nm laser diodes, 6. polarization maintaining optical fibre wave filter, 7.1:99 polarization-maintaining fiber couplers, 8. adjustable optic fibre attenuator,
9. photodetector, 10. feedback controller, 11. laser diode drives.
Specific embodiment
In present embodiment：First, second 1480/1550 polarization maintaining optical fibre isolation wavelength division multiplexer 1-1 and 1-2：Model
HPMIWDM-5548-B-S-F-01-N-B-0.8,1460~1490nm of pumping wavelength, 1530~1565nm of optical maser wavelength, power
Capacity 1W, leads directly to branch road insertion loss 0.7dB, reflects branch road insertion loss 0.5dB, more scientific and technological (Shenzhen) the Co., Ltd system of light
Make, C1-1And C1-2Represent public port, P1-1And P1-2Represent straight-through port, R1-1And R1-2Represent reflector port；
980nm laser diodes 2：Model SC962UF76P-20R, wavelength 980nm, power output 750mW (@driving currents
1.1A), Single-Mode Fiber Coupling output, U.S.'s OCLARO INC. manufactures；
980/1550 polarization maintaining optical fibre isolates wavelength division multiplexer 3：Model HPMIWDM-5598-B-S-F-01-N-B-0.8, pump
960~990nm of pumping wavelength, 1530~1565nm of optical maser wavelength, power capacity 1W, lead directly to branch road insertion loss 0.7dB, reflection branch
Road insertion loss 0.5dB, more scientific and technological (Shenzhen) the Co., Ltd manufacture of light, C3Represent public port, P3Represent straight-through port, R3Table
Show reflector port；
Er-doped fiber 4：Model Er110-4/125, absorption coefficient 110dB/m, length 250mm, U.S.'s NLIGHT INC. systems
Make；
1480nm laser diodes 5：Model AF4B142FG80L, wavelength 1480nm, power output 320mW (@driving currents
1A), Single-Mode Fiber Coupling output, Japanese ANRITSU CORP. manufactures；
Polarization maintaining optical fibre wave filter 6：Model PMDWDM-1-34-NNN-BBB-0.8, wavelength 1550nm, bandwidth (@0.5dB)
0.4nm, insertion loss (reflection branch road) 0.3dB, more scientific and technological (Shenzhen) the Co., Ltd manufacture of light, C6Represent public port, P6Represent
Straight-through port, R6Represent reflector port；
1:99 polarization-maintaining fiber couplers 7：Model HPMFC-1550-1-01-F-01-NNN-BBB-P-0.8, wavelength
1550nm, splitting ratio 1:99, insertion loss 0.3dB, more scientific and technological (Shenzhen) the Co., Ltd manufacture of light, I7Represent input port, S7,01
Represent 1% output port, S7,99Represent 99% output port；
Adjustable optic fibre attenuator 8：Model PMVOA-55-22-BB-0.8, wavelength 1550nm, maximum attenuation scope 30dB, light
More scientific and technological (Shenzhen) Co., Ltd manufacture；
Photodetector 9：Model DET10C, 700~1800nm of response wave length, rise time 10ns, U.S. THORLABS
INC. manufacture；
Feedback controller 10：Model IFC-50B, bandwidth 10MHz, group delay<50ns@12MHz, low-frequency gain>80dB is beautiful
State's THORLABS INC. manufactures；
Laser diode drive 11：Model ADA4870, bandwidth 70MHz, output current 1A, U.S. ANALOG
DEVICES INC. are manufactured.
Embodiment in present embodiment：
The output port of 980nm laser diodes 2 connects the reflection end that 980/1550 polarization maintaining optical fibre isolates wavelength division multiplexer 3
Mouth R3, the public port C of the one 1480/1550 polarization maintaining optical fibre isolation wavelength division multiplexer 1-11-1Connect 980/1550 polarization maintaining optical fibre
Isolate the straight-through port P of wavelength division multiplexer 33, 980/1550 polarization maintaining optical fibre isolation wavelength division multiplexer 3 common port C3Er light is mixed in connection
Fine 4 one end, the other end of Er-doped fiber 4 connects the common port of the 2nd 1480/1550 polarization maintaining optical fibre isolation wavelength division multiplexer 1-2
C1-2, the straight-through end P of the 2nd 1480/1550 polarization maintaining optical fibre isolation wavelength division multiplexer 1-21-2The public affairs of connection polarization maintaining optical fibre wave filter 6
C is held altogether6, the reflection end R of polarization maintaining optical fibre wave filter 66Connection 1:The input I of 99 polarization-maintaining fiber couplers 77, 1:99 polarization maintaining optical fibres
1% output port S of coupler 77,01One end of connection adjustable optic fibre attenuator 8, the other end of adjustable optic fibre attenuator 8 is successively
Connection photodetector 9, feedback controller 10, laser diode drive 11,1480nm laser diodes 5,1480nm laser
The output end of diode 5 connects the reflection end R of the 2nd 1480/1550 polarization maintaining optical fibre isolation wavelength division multiplexer 1-21-2。
The 980nm pump lights of the output of 980nm laser diodes 2 isolate wavelength division multiplexer 3 by 980/1550 polarization maintaining optical fibre
Injection Er-doped fiber 4, meanwhile, the 1480nm pump lights of the output of 1480nm laser diodes 5 pass through the 2nd 1480/1550 polarization-maintaining light
Fibre isolation wavelength division multiplexer 1-2 injection Er-doped fibers 4, form laser gain wherein；Input laser passes sequentially through the 1st
1550 polarization maintaining optical fibres isolate wavelength division multiplexer 1-1 and 980/1550 polarization maintaining optical fibre isolation wavelength division multiplexer 3, then by Er-doped fiber
After 4, laser power is amplified；1480nm pump lights by part Er ions from ground state level pump-coupling to upper laser level,
Again by quickly relaxing towards up to the sub- energy level of Laser emission (shown in such as Fig. 2 (b)) in energy level, the relaxation time is ns magnitudes, is made
More than 100MHz must be can reach to the modulation bandwidth of laser gain；Wavelength division multiplexer is isolated by the 2nd 1480/1550 polarization maintaining optical fibre
1-2, polarization maintaining optical fibre wave filter 6,1:99 polarization-maintaining fiber couplers 7, adjustable optic fibre attenuator 8, photodetector 9, feedback control
Device 10, laser diode drive 11,1480nm laser diodes 5 form the feedback control loop of laser intensity noise, pass through
The gain of feedback control fiber amplifier, then can suppress relaxation oscillation frequency nearby and low frequency lasers intensity noise；Output laser
From 1:99% output port S of 99 polarization-maintaining fiber couplers 77,99Output.
One 1480/1550 polarization maintaining optical fibre isolation wavelength division multiplexer 1-1 is used to filter the 1480nm pump lights of back-propagating,
Avoiding pump light influences the normal work of fiber optic laser source；Polarization maintaining optical fibre wave filter 6 is used to filtering spontaneous beyond optical maser wavelength
Radiant light.
Part characteristic according to employed in the present embodiment, the loop of the feedback control loop of the laser intensity noise
With a width of 10MHz or so, the crest frequency of the noticeably greater than relaxation oscillation of conventional fiber laser (be normally at 200kHz~
2MHz), by debugging the gain of feedback controller 10 or the insertion loss of adjustable optic fibre attenuator 8, can effectively suppress relaxation and shake
Swing near frequency and low frequency lasers intensity noise；In contrast, if carrying out feedback control to 980nm laser diodes 2, Er light is mixed
The pump light for playing the Yb Ions Absorptions 980nm of sensibilization in fine 4, produces energy level transition, and relaxation mistake is then passed through again
Journey transfers energy to Er ions, shown in such as Fig. 2 (a).And it is general in more than 10 μ s the time required to the relaxation process, make loop control
Bandwidth processed is difficult to reach more than 100kHz, can seriously limit noise suppression effect.
In terms of power output, the power output of single-frequency polarization-maintaining fiber laser can reach 77mW or so, (bibliography 1：
The continuous single frequency optical fiber laser of Yang Changsheng, Xu Shanhui, Li Can, Mo Shupei, Feng Zhouming, Jiang Zhonghong, Yang Zhongmin, 1.5 mu m waveband
Progress, Chinese science：Chemistry, 43 (2013), 1407-1417), the pumping-laser transformation efficiency of highly doped Er-doped fiber
More than 29% (bibliography 1) is can reach, with reference to the Insertion Loss characteristic of each component in the present embodiment, and the connection of each element is considered
Loss, output power for fibre amplifier can reach more than 200mW.
Laser output power can further improve using the laser diode of more power, as do not considered pumping light power
Limitation, the power output of fiber amplifier is primarily limited to nonlinear effect, and the non-thread of single mode Er-doped fiber 4 and conduction optical fiber
Property effect threshold value be more than 10W (bibliography 1), i.e., below 10W power outputs, nonlinear effect is negligible.Therefore, the present invention
With power capacity and good power expansion higher, high power and the output of occupational noise laser can be simultaneously obtained.
Claims (1)
1. it is a kind of suppress optical fiber laser output intensity noise fiber amplifier, it is characterised in that the fiber amplifier bag
Include the one 1480/1550 polarization maintaining optical fibre isolation wavelength division multiplexer, the 2nd 1480/1550 polarization maintaining optical fibre isolation wavelength division multiplexer,
980nm laser diodes, 980/1550 polarization maintaining optical fibre isolation wavelength division multiplexer, Er-doped fiber, 1480nm laser diodes, polarization-maintaining
Optical fiber filter, 1:99 polarization-maintaining fiber couplers, adjustable optic fibre attenuator, photodetector, feedback controller, laser diode
Driver；
The output port of 1480nm laser diodes connects the reflection end that the 2nd 1480/1550 polarization maintaining optical fibre isolates wavelength division multiplexer
Mouthful, the public port of the one 1480/1550 polarization maintaining optical fibre isolation wavelength division multiplexer connects the isolation wavelength-division of 980/1550 polarization maintaining optical fibre
The straight-through port of multiplexer, the common port of 980/1550 polarization maintaining optical fibre isolation wavelength division multiplexer connects one end of Er-doped fiber, mixes
The other end of Er optical fiber connects the common port that the 2nd 1480/1550 polarization maintaining optical fibre isolates wavelength division multiplexer, and the 2nd 1480/1550 protects
The straight-through end of inclined Fiber isolation wavelength division multiplexer connects the common port of polarization maintaining optical fibre wave filter, the reflection end of polarization maintaining optical fibre wave filter
Connection 1:The input of 99 polarization-maintaining fiber couplers, 1:The 1% output port connection adjustable optic fibre of 99 polarization-maintaining fiber couplers declines
Subtract one end of device, the other end of adjustable optic fibre attenuator is sequentially connected photodetector, feedback controller, laser diode and drives
Device, 1480nm laser diodes；During work, input laser is straight from the one 1480/1550 polarization maintaining optical fibre isolation wavelength division multiplexer
Go side mouthful input, exports laser from 1:The 99% output port output of 99 polarization-maintaining fiber couplers.
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Cited By (4)
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| CN110112638A (en) * | 2019-03-04 | 2019-08-09 | 电子科技大学 | A kind of high-gain low-noise erbium-doped fiber amplifier device |
| CN113346347A (en) * | 2021-05-06 | 2021-09-03 | 电子科技大学 | YVO for Nd4Laser intensity noise suppression device of laser |
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| CN109004988A (en) * | 2018-08-10 | 2018-12-14 | 无锡恒纳信息技术有限公司 | It is a kind of to inhibit self-oscillatory double semiconductor optical amplification systems |
| CN110112638A (en) * | 2019-03-04 | 2019-08-09 | 电子科技大学 | A kind of high-gain low-noise erbium-doped fiber amplifier device |
| CN113517627A (en) * | 2021-03-30 | 2021-10-19 | 廊坊市路环科技有限公司 | Ultra-narrow linewidth optical fiber laser capable of inhibiting relaxation oscillation |
| CN113346347A (en) * | 2021-05-06 | 2021-09-03 | 电子科技大学 | YVO for Nd4Laser intensity noise suppression device of laser |
| CN113346347B (en) * | 2021-05-06 | 2022-12-13 | 电子科技大学 | YVO used as Nd 4 Laser intensity noise suppression device of laser |
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