CN106785833B - A kind of erbium-doped fiber amplifier of power limiting gain controllable - Google Patents
A kind of erbium-doped fiber amplifier of power limiting gain controllable Download PDFInfo
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- CN106785833B CN106785833B CN201611110860.6A CN201611110860A CN106785833B CN 106785833 B CN106785833 B CN 106785833B CN 201611110860 A CN201611110860 A CN 201611110860A CN 106785833 B CN106785833 B CN 106785833B
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- doped fiber
- multiplexer
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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
- H01S3/06754—Fibre amplifiers
- H01S3/06758—Tandem amplifiers
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- Optics & Photonics (AREA)
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Abstract
The present invention discloses a kind of erbium-doped fiber amplifier of power limiting gain controllable, including the first isolator, the first optical splitter, the first multiplexer, the first Er-doped fiber, the second multiplexer, the second Er-doped fiber, the second isolator, the second optical splitter, controller, the first photodetector and the second photodetector, the present invention solves that noise coefficient in the prior art is big and the technical problem of gain flatness difference.
Description
Technical field
The present invention relates to technical field of photo communication more particularly to a kind of Erbium-doped fiber amplifiers of power limiting gain controllable
Device.
Background technique
The basic principle of erbium-doped fiber amplifier is to utilize the shape under the excitation of pump light of the Er3+ ion in Er-doped fiber
At population inversion, stimulated radiation light amplification is realized under the induction of signal light.Pumping source generallys use 980nm's and 1480nm
Laser.The metastable state and ground state of Er3+ ion have certain width, and the enlarge-effect of EDFA is made to have a wavelength range,
Representative value is in 1530-1570nm.
However, other than stimulated radiation and excited absorption occurs, also to be generated spontaneous when Er3+ ion is in metastable state
Radiation, i.e. Er3+ ion of short duration stop in metastable state do not have had a chance to interact with photon, will be spontaneously from metastable state
It transits to ground state and launches the photon of 1550nm wave band, this photon is different from signal light, it constitutes the noise of EDFA.In reality
In the system of border, due to the presence of spontaneous radiation and optical noise, erbium-doped fiber amplifier is not only propagated and amplified signal light, simultaneously
Also it is exaggerated spontaneous radiation, this non-signal light propagated and amplified in a fiber is called ASE light.
Although the power very little of ASE, the frequency that it is covered is very wide, can consume the pump power of a part, Er Qieyou
Two directions of propagation (forward and reverse) are so that influence the amplification factor of signal.Especially the ASE light of reverse transfer is by anti-
To amplification after, pass to quite big when the input terminal of erbium-doped fiber amplifier, and signal light at this time is then very weak, this
Sample will directly result in the deterioration of noise coefficient and signal gain.
With the continuous development of the communication technology, extensive concern of the communication of broadband and high speed increasingly by society.Especially
The huge potential broadband of DWDM (dense wave division multipurpose) bring of optical communication field, broadband transmission are attracted attention by people.From er-doped light
Since fiber amplifier is commercial, it is unquestionably played a crucial role in all optical communication.It is mixed 1.55um wave band
Doped fiber amplifier (EDFA) can effectively compensate for fiber transmission attenuation and shunt loss.However, since EDFA itself exists
Gain unevenness and the gain spreading characteristic that is uniformly saturated, this power difference gradually accumulate, can make along transmission path
At certain signal power high concentrations, cause fiber nonlinear effect (such as: Self-phase modulation SPM, Cross-phase Modulation XPM
Deng), and certain channel powers are too small, exceed receiver sensitivity range.Therefore, the unbalanced eventually serious evil of channel power
The performance of change system.It will appear the unbalanced phenomenon of interchannel power in signal amplification process.
In order to solve this problem, there has been proposed a variety of technical sides that power limiting is realized using erbium-doped fiber amplifier
Case, the signal for keeping power different output power after amplification are identical.Wherein, Oliver C.Graydon etc. proposes a kind of insertion
The mechanism of differential loss realizes power limiting, relatively simple for structure.But the program is using the fiber turns for being coiled into certain diameter
Realize the differential loss to pump light and signal light, reliability is poor.
Traditional unistage type erbium-doped fiber amplifier optical path: signal light and pump light are coupled into er-doped light by coupler
Fibre, the length of Er-doped fiber generally pass through theoretical modeling and reach maximization under given pumping efficiency.Since Er-doped fiber is put
Stimulated radiation and spontaneous radiation are existed simultaneously in big device, spontaneous radiation is constantly amplified during propagation, to output
Apparent noise can be become when end, to influence the signal-to-noise ratio of output signal.
Summary of the invention
The object of the present invention is to provide a kind of erbium-doped fiber amplifiers of power limiting gain controllable, solve in the prior art
Noise coefficient is big and the technical problem of gain flatness difference；
The technical scheme to solve the above technical problems is that
A kind of erbium-doped fiber amplifier of power limiting gain controllable, including it is the first isolator, the first optical splitter, first multiple
With device, the first Er-doped fiber, the second multiplexer, the second Er-doped fiber, the second isolator, the second optical splitter, controller, the first light
Detector and the second photodetector；
The input optical signal enters the first Er-doped fiber by the first isolator, the first optical splitter and the first multiplexer,
The output end of input the first optical splitter of termination of first photodetector；
The input terminal of the controller is separately connected the first optical detector and the second optical detector, the output of the controller
End connects the input terminal of the first multiplexer through pump laser；
The output end of first Er-doped fiber connects the second multiplexer, the output end connection second of second multiplexer
Er-doped fiber；
Second Er-doped fiber is sequentially connected second isolator and the second optical splitter.
Based on the above technical solution, the present invention can also be improved as follows:
Further, it further includes differential loss ring, and the differential loss ring is arranged in the first Er-doped fiber, the second er-doped light
Between fibre, and differential loss ring is in parallel with the second multiplexer.
Further, the differential loss ring includes adjustable attenuator and third isolator, the adjustable attenuator and third
Isolator series connection, and adjustable attenuator is connect with the controller,
Further, it further includes back-ray detection device, and the back-ray detection device is separately connected the second optical splitter, controller.
Beneficial effects of the present invention:
1. the present invention is separated using the Er-doped fiber of two sections of cascade optimizations by isolator, allow signal light logical from forward direction
It crosses, and the ASE noise of backpropagation can not be by leading portion optical fiber, so that reversed ASE noise will not consume pump laser
Power and influence signal improve signal gain amplifier in the amplification of leading portion.
2. the present invention can reduce the first order since reversed ASE noise is not amplified in first segment Er-doped fiber
Noise coefficient, since in multilevel system, the total noise coefficient of system is mainly influenced by first order noise coefficient, so can
To reduce total noise coefficient.
3. the present invention utilizes and places adjustable attenuator in circuit, adjustable by changing the loss of adjustable attenuator
The average reversion level of Er-doped fiber, further changes the gain tilt in EDFA gain spectral；
4. the present invention is turned using the first optical detector, the input of the second optical detector acquisition signal, output power by A/D
Signal is converted into digital signal, via controller processing, control pump laser output, to reach fine tuning pump by analog quantity by parallel operation
The pump power of Pu laser；
5. the present invention does light echo detection from output end using back-ray detection device, the subsequent optical fiber of output end once breaks
Road, local erbium-doped fiber amplifier can detecte stronger back wave, so that microprocessor judgement and time disconnected pumping swash
Light device is avoided injuring other optical devices and be alarmed.
Detailed description of the invention
It, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution in the prior art
Embodiment or attached drawing needed to be used in the description of the prior art be briefly described, it should be apparent that, it is described below
Attached drawing is some embodiments of the present invention, for those of ordinary skill in the art, before not making the creative labor
It puts, is also possible to obtain other drawings based on these drawings.
Fig. 1 is a kind of structure of the erbium-doped fiber amplifier of power limiting gain controllable described in the specific embodiment of the invention
Schematic diagram；
Fig. 2 is a kind of pumping of the erbium-doped fiber amplifier of power limiting gain controllable described in the specific embodiment of the invention
Light and signal light power strangulation curve.
In attached drawing, parts list represented by the reference numerals are as follows:
1, the first isolator；2, the first optical splitter；3, the first multiplexer；4, the first Er-doped fiber；5, the second multiplexer；6,
Second Er-doped fiber；7, the second isolator；8, the second optical splitter；9, controller；10, the first photodetector；11, the second light detection
Device；12, pump laser；13, differential loss ring；14, adjustable attenuator；15, third isolator；16, back-ray detection device；17,
First port；18, second port；19, third port；20, the 4th port.
Specific embodiment
The principle and features of the present invention will be described below with reference to the accompanying drawings, and the given examples are served only to explain the present invention, and
It is non-to be used to limit the scope of the invention.
Technical solution of the present invention is clearly and completely described below in conjunction with attached drawing, it is clear that described implementation
Example is a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill
Personnel's every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that term " first " and " second " are used for description purposes only, and cannot
It is interpreted as indication or suggestion relative importance.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
To be mechanical connection, it is also possible to be electrically connected；It can be directly connected, can also can be indirectly connected through an intermediary
Connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood at this with concrete condition
Concrete meaning in invention.
Embodiment:
A kind of erbium-doped fiber amplifier of power limiting gain controllable, including the first isolator 1, the first optical splitter 2, first
Multiplexer 3, the first Er-doped fiber 4, the second multiplexer 5, the second Er-doped fiber 6, the second isolator 7, the second optical splitter 8, control
Device 9, the first photodetector 10 and the second photodetector 11；
The input optical signal enters the first er-doped light by the first isolator 1, the first optical splitter 2 and the first multiplexer 3
Fibre 4, the output end of input the first optical splitter 2 of termination of first photodetector 10；
The input terminal of the controller 9 is separately connected the first optical detector 10 and the second optical detector 11, the controller 9
Output end through pump laser 12 connect the first multiplexer 3 input terminal；
The output end of first Er-doped fiber 4 connects the second multiplexer 5, the output end connection of second multiplexer 5
Second Er-doped fiber 6；
Second Er-doped fiber 6 is sequentially connected second isolator 7 and the second optical splitter 8.
Wherein, it further includes differential loss ring 13, and the setting of differential loss ring 13 is mixed in the first Er-doped fiber 4, second
Between erbium optical fiber 6, and differential loss ring 13 is in parallel with the second multiplexer 5.
Further, the differential loss ring 13 includes adjustable attenuator 14 and third isolator 15, the adjustable attenuator
14 and third isolator 15 connect, and adjustable attenuator 14 is connect with the controller 15,
Wherein, it further includes back-ray detection device 16, and the back-ray detection device 16 is separately connected the second optical splitter 8, controller
9。
The working principle of the invention:
Optical signal is coupled to third end from the first port 17 of differential loss ring 13 after first segment Er-doped fiber 4
Mouth 19, after optoisolator 6 and variable attenuator 7, and is coupled to the 4th port 20 from second port 18 and enters back into second segment
In Er-doped fiber 6.And the residual pump light exported from first segment Er-doped fiber 4 is directly from the first port 17 of differential loss ring 13
It is coupled to the 4th port 20, almost without added losses；
The electric signal for the light that first photodetector 10, the second photodetector 11 and back-ray detection device 16 detect all is sent into control
Device 9, the controller 9 control the work of pump laser 12 accordingly, the laser power of pump laser 12 by the first multiplexer 3 with
First segment Er-doped fiber 4 is inputted after signal optical coupling.
Wherein 9 major function of controller includes optical detector acquisition unit, pump laser power driving unit, micro process
The function of device (MCU) and control keyboard and display, gain control is implemented as follows: the first optical detector 10 and the second light are visited
It surveys device 11 and acquires the instant laser power of input, output signal respectively, and export corresponding electric signal to controller 9；
(1) optical detector acquisition unit is electric by the luminous intensity of the first optical detector 10 and the acquisition input of the second optical detector 11
Signal is converted into digital signal by analog quantity；
(2) it is handled through Micro-processor MCV, the gain of real-time signal is calculated.
(3) by the instant gain of signal compared with preset target gain, controller 9 goes out to pump according to certain step size computation
This result is converted into analog signal output to pump by D/A converter by the increase or reduction amount of 12 Injection Current of Pu laser
Pu laser 12, to reach the power of fine tuning pump laser；
(4) real-time signal gain adjusted is measured according to the method in (1)-(3) step, repeats Step d, until pumping
The instant gain of the signal of laser 12 reaches target gain.
According to theory it is experimentally confirmed that Fig. 2 gives pump light and signal light power under structure shown in Fig. 1 that simulation calculates
Strangulation curve.Solid line and dotted line respectively represent characteristic when input is -20dB and 0dB.It can be seen that by first segment er-doped light
After fibre 4, two signals are amplified, and the gain that still -20dB signal gain ratio 0dB is obtained is much smaller.Continue through difference
Different consumptive loop 5, which is decayed, to be entered after second segment Er-doped fiber 6 after identical dB numerical value, inputs the signal for -20dB in residual pump
Continue to be amplified under the light stimulus of Pu, and inputs the signal second segment Er-doped fiber 6 for being 0dB and it is slightly absorbed.As a result, two
The output end that signal of different sizes is inputted in second segment Er-doped fiber 6 merges on the same power points.From -20dB to 0dB
Between any size signal corresponding power change curve should between this two curves, therefore, -20dB arrive 0dB 20dB
Power limiting is realized in dynamic range.
Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Pipe present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: its according to
So be possible to modify the technical solutions described in the foregoing embodiments, or to some or all of the technical features into
Row equivalent replacement；And these are modified or replaceed, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme.
Claims (2)
1. a kind of erbium-doped fiber amplifier of power limiting gain controllable, it is characterised in that: including the first isolator, the first light splitting
Device, the first multiplexer, the first Er-doped fiber, the second multiplexer, the second Er-doped fiber, the second isolator, the second optical splitter, control
Device, the first photodetector, the second photodetector and input optical signal；
The input optical signal enters the first Er-doped fiber by the first isolator, the first optical splitter and the first multiplexer, described
The output end of input the first optical splitter of termination of first photodetector；
The input terminal of the controller is separately connected the first optical detector and the second optical detector, the output end warp of the controller
Pump laser connects the input terminal of the first multiplexer；
The output end of first Er-doped fiber connects the second multiplexer, and the output end of second multiplexer connects the second er-doped
Optical fiber；
Second Er-doped fiber is sequentially connected second isolator and the second optical splitter；
It further includes differential loss ring, and the differential loss ring is arranged between the first Er-doped fiber, the second Er-doped fiber, and poor
Different consumptive loop is in parallel with the second multiplexer；The differential loss ring includes adjustable attenuator and third isolator, described adjustable to decline
Subtract device and the series connection of third isolator, and adjustable attenuator is connect with the controller.
2. a kind of erbium-doped fiber amplifier of power limiting gain controllable according to claim 1, which is characterized in that it is also
Including back-ray detection device, the back-ray detection device is separately connected the second optical splitter, controller.
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| CN109038189B (en) * | 2018-07-27 | 2019-12-31 | 武汉光迅科技股份有限公司 | Double 980 pump laser pair pump structure for EDFA |
| CN114156722B (en) * | 2021-12-15 | 2023-12-22 | 无锡市德科立光电子技术股份有限公司 | Control method of VOA in variable gain erbium-doped fiber amplifier |
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| US5764406A (en) * | 1996-10-01 | 1998-06-09 | Corning Incorporated | Hydrid optical amplifier having improved dynamic gain tilt |
| CN1265240C (en) * | 2002-07-18 | 2006-07-19 | 华为技术有限公司 | Low-noise variable-gain optical amplifier |
| CN101217319A (en) * | 2008-01-10 | 2008-07-09 | 复旦大学 | A gain controllable two-segment erbium-doped optical fiber amplifier |
| CN105656561A (en) * | 2016-03-21 | 2016-06-08 | 吉林大学 | Double-ring feedback gain flattening erbium-doped optical fiber amplifier |
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Non-Patent Citations (1)
| Title |
|---|
| Erbium-doped-fiber optical limiting amplifiers;Oliver C.Graydon et al;《JOURNAL OF LIGHTWAVE TECHNOLOGY》;19950531;第13卷(第5期);第732-739页 |
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Denomination of invention: An erbium-doped fiber amplifier with controllable power clamp gain Effective date of registration: 20201126 Granted publication date: 20190423 Pledgee: Jiangsu Credit Financing Guarantee Co.,Ltd. Pledgor: JIANGSU HIMARK HI-TECH Co.,Ltd. Registration number: Y2020980008539 |