CN110112638A - A kind of high-gain low-noise erbium-doped fiber amplifier device - Google Patents
A kind of high-gain low-noise erbium-doped fiber amplifier device Download PDFInfo
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- CN110112638A CN110112638A CN201910160088.6A CN201910160088A CN110112638A CN 110112638 A CN110112638 A CN 110112638A CN 201910160088 A CN201910160088 A CN 201910160088A CN 110112638 A CN110112638 A CN 110112638A
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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
- H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
- H01S3/06716—Fibre compositions or doping with active elements
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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
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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
- H01S3/06791—Fibre ring lasers
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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
- H01S3/08—Construction or shape of optical resonators or components thereof
- H01S3/08018—Mode suppression
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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
- H01S3/09—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
- H01S3/094049—Guiding of the pump light
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Abstract
The invention belongs to technical field of optical fiber sensing, are related to a kind of relaying optical signal amplification technology, specifically provide a kind of high-gain low-noise erbium-doped fiber amplifier device, to improve system gain, reduce system noise, improve signal-to-noise ratio.The present invention substitutes common doping concentration Er-doped fiber using high-dopant concentration Er-doped fiber in traditional linear structure erbium-doped fiber amplifier, and then input signal light can effectively be amplified, then it is re-introduced into and is made of hybrid fiber annular chamber inhibition system noise common doping concentration Er-doped fiber and fiber coupler, highly nonlinear optical fiber, WDM, Polarization Controller, the signal-to-noise ratio for improving system signal light, promotes the sensitivity and accuracy of optical fiber sensing system；And apparatus of the present invention have many advantages, such as that structure is simple, are easily integrated.
Description
Technical field
The invention belongs to technical field of optical fiber sensing, are related to a kind of relaying optical signal amplification technology, specially a kind of high increasing
Beneficial low noise erbium-doped fiber amplifier device reduces system noise, improves signal-to-noise ratio to improve system gain.
Background technique
Fibre Optical Sensor is the medium using optical fiber as transmission, a kind of novel sensing skill of the lightwave signal as the carrier propagated
Art, relative to traditional sensing technology, Fibre Optical Sensor has high sensitivity, service life length, not by outside electromagnetic interference, to environment
Adaptable, advantages of simple structure and simple is widely used in the early warning of security protection circumference, line leakage, railway security monitoring etc.
Field.Currently, the non-relay long range that the Distributed Optical Fiber Sensing Techniques based on wavelength-division multiplex have been carried out tens kilometers passes
Sense, but to realize longer extra long distance sensing, it must just solve optical fiber and the optical device bring in transmission process and damage
Consumption, it is therefore desirable to which the weak signal light of decaying is amplified.
Erbium-doped fiber amplifier (Erbium-Doped Fiber Amplifier, EDFA) has high-gain, low noise, increasing
The features such as benefit is flat makes it be widely used in the relaying amplification for realizing signal light in optical fiber sensing system.Erbium-doped fiber amplifier
The basic principle of device be when signal light passes through Er-doped fiber, in metastable carrier due to the incentive action of signal light,
It is transitted in stable state in a manner of stimulated radiation, largely photon identical with signal light is generated in the process, to realize light
Amplification.However, can also generate spontaneous radiation, the photon of spontaneous radiation other than stimulated radiation in metastable erbium ion
Can also it be amplified in transmission process, to generate spontaneous emission noise.Moreover, the photon and signal light of spontaneous radiation it
Between interaction, the interaction between spontaneous radiation photon can also generate beat frequency noise and the shot of spontaneous radiation is made an uproar
Sound etc. increases the noise of system, influences the sensitivity and accuracy of sensor-based system.In addition, with optical fiber sensing technology
Development need effectively to be put faint Rayleigh beacon light in long-distance distributed optical fiber sensor-based system
Greatly, to the gain of optical signal, higher requirements are also raised, the image intensifer of urgent demand high-gain, low noise.
Traditional linear structure erbium-doped fiber amplifier when using common doping concentration Er-doped fiber as gain media, though
The lower signal gain of noise coefficient can be so obtained, but due to the limitation of common doping concentration Er-doped fiber, whole increasing
Benefit is lower, is not able to satisfy the demand in optical fiber sensing technology to high-gain fiber amplifier；If using high-dopant concentration er-doped
When optical fiber is as gain media, although higher gain can be obtained, biggish ASE noise can be introduced, system is reduced
Signal-to-noise ratio influences the sensitivity and accuracy of optical fiber sensing system.Therefore, the present invention is by the linear structure er-doped light of high-gain
Fiber amplifier and with gain compensation, inhibit system noise effectiveness hybrid fiber annular chamber be combined together to form it is a kind of new
The erbium-doped fiber amplifier of type structure has obtained the erbium-doped fiber amplifier of high-gain, low noise.
Summary of the invention
The purpose of the present invention is to provide a kind of high-gain low-noise erbium-doped fiber amplifier devices, in existing er-doped
The gain of amplifier is improved on the basis of fiber amplifier, the noise of step-down amplifier obtains the good amplified signal of signal-to-noise ratio
Light.The present invention provides high-gain by high-dopant concentration Er-doped fiber, then uses common doping concentration Er-doped fiber and optical fiber
Coupler, highly nonlinear optical fiber, WDM, Polarization Controller, which constitute hybrid fiber annular chamber, to be carried out compensating gain and inhibits noise, with
Improve the signal-to-noise ratio of signal light.
To achieve the above object, The technical solution adopted by the invention is as follows:
A kind of high-gain low-noise erbium-doped fiber amplifier device, comprising: pumping source 1, the first wavelength division multiplexer 2,1 × 2
Fiber coupler 3, the second wavelength division multiplexer 4, the second Er-doped fiber 5, input signal light source 6, the first optoisolator 7, third
Wavelength division multiplexer 8, the first Er-doped fiber 9, the second optoisolator 10, first filter 11,2 × 2 fiber couplers 12, second
Filter 14, third optoisolator 15, Polarization Controller 16 and highly nonlinear optical fiber 17；Wherein, input signal light source 6, first
Optoisolator 7, third wavelength division multiplexer 8, the first Er-doped fiber 9, the second optoisolator 10, first filter 11 are sequentially connected
Constitute linear structure erbium-doped fiber amplifier；It is characterized in that, second wavelength division multiplexer 4, the second Er-doped fiber 5, Gao Fei
After linear optical fiber 17, Polarization Controller 16 are sequentially connected, both ends are connected to two ports of 2 × 2 fiber couplers 12,
Collectively form hybrid fiber annular chamber；
The total pump light of the pumping source 1 is incident to 1 × 2 fiber coupler 3 after the first wavelength division multiplexer 2, through 1 ×
2 fiber couplers are divided into two bundles branch's pump light, wherein a branch of branch's pump light is transmitted to the second wavelength division multiplexer 4, is used for
Pump energy is provided for the gain compensation of hybrid fiber annular chamber, another beam branch pump light is transmitted to third wavelength division multiplexer
8, pump energy is provided for amplifying optical path for linear structure；The output light of the linear structure erbium-doped fiber amplifier is incident
To 2 × 2 fiber couplers 12, it is divided into the two-beam transmitted in opposite directions after 2 × 2 fiber couplers and enters hybrid fiber annular
In chamber, respectively along transmitting clockwise and counterclockwise, and interfere output at 2 × 2 fiber couplers 12, output light letter
It number is successively emitted after third optoisolator 15, filter 14.
Further, the transfer function of the hybrid fiber annular chamber are as follows:
Wherein, g is the gain coefficient of Er-doped fiber, and γ is the nonlinear factor of highly nonlinear optical fiber, P0It is input mixing
The signal light power of optic fiber ring-shaped cavity, L are the length of hybrid fiber annular chamber.
Further, in the linear linear structure erbium-doped fiber amplifier, the input signal light source 6 issues input letter
Number light is incident on Part III multiplexer 8 after the first optoisolator 7, and input signal light couples together with branch's pump light
Into the first Er-doped fiber 9, then in turn through being exported after the second optoisolator 10, first filter 11.
Further, first Er-doped fiber 9 uses peak absorption for the Er-doped fiber of 30dB/m@1530nm,
Doping concentration is higher, length 7m；Second Er-doped fiber 5 uses peak absorption for the er-doped of 6dB/m@1530nm
Optical fiber, doping concentration is lower, length 6m.
Further, the nonlinear factor of the highly nonlinear optical fiber is 11.5 (WKm)-1, length 42m.
Further, the splitting ratio of 1 × 2 fiber coupler is 80:20, wherein branch's pump light of accounting 20 passes
The second wavelength division multiplexer is transported to, branch's pump light of accounting 80 is transmitted to third wavelength division multiplexer.
In the present invention, the main function of hybrid fiber annular chamber is to inhibit system noise, can be changed by Polarization Controller
In a disguised form to the polarization state of the two-beam of transmission, the phase of two-beam can change by highly nonlinear optical fiber, finally in 2 × 2 light
It interferes and exports at fine coupler；It can be seen from the transfer function of hybrid fiber annular chamber by Optimal Parameters g,
γ, L, the transfer function value of lower-powered noise light are approximately zero, are suppressed, and the biggish signal light of power then not by
It influences, so hybrid fiber annular chamber has the function of inhibiting system noise well；Finally, it is exported through the invention
Signal light not only has good gain, and has lower noise coefficient.
In conclusion the beneficial effects of the present invention are:
The present invention provides a kind of high-gain low-noise erbium-doped fiber amplifier device, puts in traditional linear structure Er-doped fiber
Common doping concentration Er-doped fiber is substituted using higher-doped concentration Er-doped fiber in big device, and then can be by input signal light
Effectively amplified, then using by common doping concentration Er-doped fiber and fiber coupler, highly nonlinear optical fiber, WDM,
Polarization Controller constitutes hybrid fiber annular chamber and inhibits system noise, improves the signal-to-noise ratio of system signal light, promotes Fibre Optical Sensor
The sensitivity and accuracy of system；And apparatus of the present invention have many advantages, such as that structure is simple, are easily integrated.
Detailed description of the invention
Fig. 1 is high-gain low-noise erbium-doped fiber amplifier system structure of device figure of the present invention；
Wherein: 1 is pumping source, and 2 be the first wavelength division multiplexer (WDM), and 3 be 1 × 2 fiber coupler, and 4 be the second wavelength-division
Multiplexer, 5 be the second Er-doped fiber, and 6 be input signal light, and 7 be the first optoisolator, and 8 be third wavelength division multiplexer, and 9 be the
One Er-doped fiber, 10 be the second optoisolator, and 11 be first filter, and 12 be 2 × 2 fiber couplers, and 13 be output signal
Light, 14 be second filter, and 15 be third optoisolator, and 16 be Polarization Controller, and 17 be highly nonlinear optical fiber.
Fig. 2 is hybrid fiber ring cavity structure figure in high-gain low-noise erbium-doped fiber amplifier device of the present invention.
Fig. 3 is high-gain low-noise erbium-doped fiber amplifier device of the present invention and traditional erbium-doped fiber amplifier device spectrum
Comparison diagram；Wherein: 1 is input signal light, and 2 be output light spectrogram of the present invention, and 3 be traditional erbium-doped fiber amplifier output spectrum
Figure.
Specific embodiment
The present invention will be further explained below with reference to the attached drawings and specific examples.
The present embodiment provides a kind of high-gain low-noise erbium-doped fiber amplifier device, structure is as shown in Figure 1, comprising:
Pumping source 1,2,1 × 2 fiber coupler 3 of the first wavelength division multiplexer (WDM), the second wavelength division multiplexer 4, the second Er-doped fiber 5,
Input signal light 6, the first optoisolator 7, third wavelength division multiplexer 8, the first Er-doped fiber 9, the second optoisolator 10, first
Filter 11,2 × 2 fiber couplers 12, output signal light 13, second filter 14, third optoisolator 15, Polarization Control
Device 16 and highly nonlinear optical fiber 17, in which:
The output end of pumping source 1 connects the 980nm input terminal of the first wavelength division multiplexer 2, the first wavelength-division multiplex by optical fiber
The end COM of device 2 connects the end COM for 1 × 21 × 2 fiber couplers 3 that splitting ratio is 20:80 by optical fiber, and pumping source and 1 ×
The first wavelength division multiplexer between 2 fiber couplers plays the role of that rear reflection light, protection pumping source is isolated；
The output end that the splitting ratio of 1 × 2 fiber coupler 3 is 80 connects the 980nm of third wavelength division multiplexer 8 by optical fiber
Input terminal provides pump energy for the linear structure amplification optical path of the first Er-doped fiber part；Point of 1 × 2 fiber coupler 3
Light connects the 980nm input terminal of the second wavelength division multiplexer 4 than the output end for 20 by light pricker, is hybrid fiber annular chamber
Gain compensation provides pump energy；Input signal light 6 connects the input terminal of the first optoisolator 7, the first optical isolation by optical fiber
The output end of device 7 connects the 1550nm input terminal of third wavelength division multiplexer 8 by optical fiber, after the first optoisolator 7 is for being isolated
Square reflected light, protection signal optical source；The end COM of third wavelength division multiplexer 8 connects the input of the first Er-doped fiber 9 by optical fiber
End, input signal light are coupled to the first Er-doped fiber 9 by third wavelength division multiplexer 8 with pump light and amplify；
The output end of first Er-doped fiber 9 connects the input terminal of the second optoisolator 10, the second optoisolator by optical fiber
10 output end connects the input terminal of first filter 11 by optical fiber；Between first Er-doped fiber and first filter
Two optoisolators improve pump conversion efficiency, improve gain and noise level, keep system work steady for reversed ASE to be isolated
It is fixed；The output end of first filter 11 connects No. 1 of 2 × 22 × 2 fiber couplers 12 that splitting ratio is 50:50 by optical fiber
Port, No. 3 ports of 2 × 2 fiber couplers 12 connect the 1550nm input terminal of the second wavelength division multiplexer 4 by optical fiber, and second
The end COM of wavelength division multiplexer 4 connects the input terminal of the second Er-doped fiber 5 by optical fiber, and the output end of the second Er-doped fiber 5 is logical
The input terminal of optical fiber connection highly nonlinear optical fiber 17 is crossed, the output end of highly nonlinear optical fiber 17 connects Polarization Control by optical fiber
The input terminal of device 16, the output end of Polarization Controller 16 connect No. 4 ports of 2 × 2 fiber couplers 12 by optical fiber, and 2 × 2
No. 2 ports of fiber coupler 12 connect the input terminal of third optoisolator 15, the output of third optoisolator 15 by optical fiber
End connects the input terminal of second filter 14, the output end output optical signal 13 of second filter 14 by optical fiber.
The light path system of high-gain low-noise erbium-doped fiber amplifier device includes: traditional linear structure Erbium-doped fiber amplifier
Device, hybrid fiber annular chamber, 1 × 2 fiber coupler 3, third optoisolator 15, second filter 14；Wherein, pumping source 1,
First wavelength division multiplexer 2, third wavelength division multiplexer 8, the first optoisolator 7, the first Er-doped fiber 9, the second optoisolator 10,
First filter 11 constitutes traditional linear structure erbium-doped fiber amplifier；The 12, second wave of 2 × 2 fiber couplers (Coupler)
The 4, second Er-doped fiber of division multiplexer (WDM) (EDF) 5, highly nonlinear optical fiber (HNLF) 17, Polarization Controller (P C) 16 are constituted
Hybrid fiber annular chamber, as shown in Figure 3；The two is connected by 2 × 2 fiber coupler 12 that splitting ratio is 50:50；Mixing
When optic fiber ring-shaped cavity works, it is divided into the two-beam transmitted in opposite directions by the signal light that No. 1 port of fiber coupler inputs and enters
In hybrid fiber annular chamber, and respectively along transmitting clockwise and counterclockwise, successively pass through Er-doped fiber, high non-linearity
Two beam output lights are interfered and are divided at fiber coupler after optical fiber, Polarization Controller, and output light is along light all the way
No. 1 port backtracking (Reflection) of fine coupler, another output light along fiber coupler No. 2 ports from
(Transmission) is exported in system；The transfer function of hybrid fiber annular chamber are as follows:
Wherein, g is the gain coefficient of Er-doped fiber, and γ is the nonlinear factor of highly nonlinear optical fiber, P0It is input mixing
The signal light power of optic fiber ring-shaped cavity, L are the length of hybrid fiber annular chamber；
From the above equation, we can see that lower-powered noise light is by suppressed output, and signal light is then unaffected, so from optical fiber
The signal light signal-to-noise ratio with higher of No. 2 ports of coupler outgoing.
In the present embodiment, the nonlinear factor of highly nonlinear optical fiber 17 is 11.5 (WKm)-1, length 42m；First mixes
Erbium optical fiber 9 uses peak absorption for the Er-doped fiber of 30dB/m@1530nm, length 7m；Second Er-doped fiber 5 uses
Peak absorption is the Er-doped fiber of 6dB/m@1530nm, length 6m.
Apparatus of the present invention and traditional erbium-doped fiber amplifier device are illustrated in figure 3 in same input signal light, same increasing
Output light spectrogram under beneficial level, wherein spectral line 1 is input signal light, and power is -30dBm, and spectral line 2 is that signal light 1 passes through
Output light spectrogram after apparatus of the present invention, spectral line 3 are output light spectrogram of the signal light 1 after traditional erbium-doped fiber amplifier,
The Output optical power of the two is set as -5dBm, i.e. gain is 25dB；As can be seen that signal light amplifies by apparatus of the present invention
Signal light afterwards has lower, narrower noise floor, i.e., effectively inhibits system noise, improve system signal noise ratio.Separately
Outside, by observing the maximum gain of apparatus of the present invention and traditional erbium-doped fiber amplifier, it is found that the increasing of apparatus of the present invention
Benefit arrives 10dB than the high gain 5 of traditional erbium-doped fiber amplifier.
The above description is merely a specific embodiment, any feature disclosed in this specification, except non-specifically
Narration, can be replaced by other alternative features that are equivalent or have similar purpose；Disclosed all features or all
Method or in the process the step of, other than mutually exclusive feature and/or step, can be combined in any way.
Claims (6)
1. a kind of high-gain low-noise erbium-doped fiber amplifier device, comprising: pumping source (1), the first wavelength division multiplexer (2), 1 ×
2 fiber couplers (3), the second wavelength division multiplexer (4), the second Er-doped fiber (5), input signal light source (6), the first optoisolator
(7), third wavelength division multiplexer (8), the first Er-doped fiber (9), the second optoisolator (10), first filter (11), 2 × 2 light
Fine coupler (12), second filter (14), third optoisolator (15), Polarization Controller (16) and highly nonlinear optical fiber
(17)；Wherein, input signal light source, the first optoisolator, third wavelength division multiplexer, the first Er-doped fiber, the second optoisolator,
First filter, which is sequentially connected, constitutes linear structure erbium-doped fiber amplifier；It is characterized in that, second wavelength division multiplexer,
After two Er-doped fibers, highly nonlinear optical fiber, Polarization Controller are sequentially connected, both ends are connected to the two of 2 × 2 fiber couplers
A port collectively forms hybrid fiber annular chamber；
The total pump light of the pumping source is incident to 1 × 2 fiber coupler after the first wavelength division multiplexer, through 1 × 2 optical fiber coupling
Clutch is divided into two bundles branch's pump light, wherein a branch of branch's pump light is transmitted to the second wavelength division multiplexer, for being hybrid fiber
The gain compensation of annular chamber provides pump energy, and another beam branch pump light is transmitted to third wavelength division multiplexer, for being linear
Structure amplifies optical path and provides pump energy；The output light of the linear structure erbium-doped fiber amplifier is incident to 2 × 2 fiber couplings
Device is divided into the two-beam transmitted in opposite directions after 2 × 2 fiber couplers and enters in hybrid fiber annular chamber, respectively along up time
Needle and counterclockwise transmission, and interfere output at 2 × 2 fiber couplers, output optical signal successively passes through third optical isolation
It is emitted after device, second filter.
2. by high-gain low-noise erbium-doped fiber amplifier device described in claim 1, which is characterized in that the hybrid fiber ring
The transfer function of shape chamber are as follows:
Wherein, g is the gain coefficient of Er-doped fiber, and γ is the nonlinear factor of highly nonlinear optical fiber, P0It is input hybrid fiber ring
The signal light power of shape chamber, L are the length of hybrid fiber annular chamber.
3. by high-gain low-noise erbium-doped fiber amplifier device described in claim 1, which is characterized in that the linear linear knot
In structure erbium-doped fiber amplifier, it is incident after the first optoisolator (7) that the input signal light source (6) issues input signal light
To Part III multiplexer (8), input signal light is coupled in the first Er-doped fiber (9) together with branch's pump light, then according to
It is secondary to be exported after (11) by the second optoisolator (10), first filter.
4. by high-gain low-noise erbium-doped fiber amplifier device described in claim 1, which is characterized in that the first er-doped light
Fibre uses peak absorption for the Er-doped fiber of 30dB/m@1530nm, length 7m；Second Er-doped fiber uses peak value
Absorption coefficient is the Er-doped fiber of 6dB/m@1530nm, length 6m.
5. by high-gain low-noise erbium-doped fiber amplifier device described in claim 1, which is characterized in that the high non-linearity
The nonlinear factor of optical fiber is 11.5 (WKm)-1, length 42m.
6. by high-gain low-noise erbium-doped fiber amplifier device described in claim 1, which is characterized in that 1 × 2 optical fiber coupling
The splitting ratio of clutch is 80:20, wherein branch's pump light of accounting 20 is transmitted to the second wavelength division multiplexer, the branch of accounting 80
Pump light is transmitted to third wavelength division multiplexer.
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| CN110673202A (en) * | 2019-09-25 | 2020-01-10 | 山东省科学院激光研究所 | Remote large-scale sensing detection system based on optical fiber laser sensor |
| KR20220042920A (en) * | 2020-09-28 | 2022-04-05 | 조선대학교산학협력단 | Phase shifting interferometer using optical fiber doped with rare earth elements |
| KR102443921B1 (en) * | 2020-09-28 | 2022-09-15 | 조선대학교산학협력단 | Phase shifting interferometer using optical fiber doped with rare earth elements |
| CN113991402A (en) * | 2021-10-29 | 2022-01-28 | 北京交通大学 | Ultra-high bandwidth quasi-all optical fiber amplifier |
| CN113991402B (en) * | 2021-10-29 | 2023-10-27 | 北京交通大学 | Ultra-high bandwidth quasi-all-fiber amplifier |
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Application publication date: 20190809 |