CN2631132Y - Mixed broadband optical fiber amplifier - Google Patents
Mixed broadband optical fiber amplifier Download PDFInfo
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- CN2631132Y CN2631132Y CNU032552750U CN03255275U CN2631132Y CN 2631132 Y CN2631132 Y CN 2631132Y CN U032552750 U CNU032552750 U CN U032552750U CN 03255275 U CN03255275 U CN 03255275U CN 2631132 Y CN2631132 Y CN 2631132Y
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Abstract
The utility model relates to a hybrid broadband fiber amplifier. The signal light passes through a Raman fiber amplifier (FRA), a fixed optical filter and an erbium doped fiber amplifier (EDFA) to achieve the C+L-band (1530 nm-1610nm) broadband amplification. The FRA is mainly used to enlarge the L-band (1570 nm-1610nm) and the EDFA is mainly used to magnify the C-band (1530 nm-1560nm). A fixed optical filter is cascade connected between the two fiber amplifiers so as to smooth the gain in the signal-band. The control unit respectively controls the pumped laser array used for pumping the FRA and the pumped laser used for pumping the EDFA according to the receiving array of p-i-n pipe and the residual incentive optical power of FRA and EDFA both of which is received by the p-i-n pipe to make the gain spectrum in the signal-band smooth more easily.
Description
Technical field
The utility model relates to the fiber amplifier field, particularly a kind of technology in conjunction with Raman Fiber Amplifier (FRA) and erbium-doped fiber amplifier (EDFA), the hybrid optical fiber amplifier that amplify in the broadband of realization C+L wave band.
Technical background
For modern lightwave system, its emphasis is to utilize wavelength division multiplexing (WDM) technology to transmit a plurality of channels simultaneously to increase transmission capacity.For multi channel lightwave system, needs adopt image intensifer that all channels are amplified simultaneously and do not need to adopt photoelectric repeater.Along with the continuous increase of optical communication system bandwidth of operation, require the bandwidth of fiber amplifier also constantly to increase.
Now, the technology of erbium-doped fiber amplifier is very ripe, and it has been widely used in the light conducting system.Although EDFA has the advantage of high-gain, low noise, stable performance, its gain spectral width is narrower, has only the 3dB gain bandwidth of 20nm ~ 30nm, and gain peak fixes, and peak wavelength changes between 1530nm and 1535nm greatly.Fig. 2 has provided the characteristic gain spectral of common EDFA.Although have various smoothing techniques can widen and level and smooth gain bandwidth, obviously can't satisfy the requirement of amplifying the C+L wave band simultaneously.
Raman Fiber Amplifier can realize that the signal in any wave band amplifies, to depolarized pumping source, its Polarization-Dependent Gain is insensitive, crosstalk noise is lower between the different wave length signal, and have good saturation output power and a good noise factor, distributed Raman fiber amplifier particularly, thus because its gain media itself is exactly the signal light power that Transmission Fibers can reduce incident optical, online amplification simultaneously can avoid in Optical Fiber Transmission signal light power to fall too lowly.
Adopt many pumping excitations to come balanced Raman Fiber Amplifier gain, can realize that the broadband of C+L wave band is amplified.For example document 1 " Y.Emori; et al.; ' and 1-THz-spaced multi-wavelength pumping for broadband Ramanamplifiers '; ECOC ' 2000; Vol.2.pp.73-75. " in, adopt N=12 pump laser to close behind the ripple, output center wavelength by setting each suitable laser and the power planarization of wave spectrum that realizes gaining then as driving source.But much more so a fairly large number of exciting light source of method needs of this level and smooth broadband signal gain, the power of control exciting light source come the flat gain wave spectrum to become is not easy very much.And the power utilization efficient of FRA driving source is much lower than EDFA, reaches identical gain, and the FRA exciting light source needs higher power, and more exciting light source makes and closes wave structure and become more complicated, will improve the cost of fiber amplifier so greatly.
The advantage of comprehensive EDFA of the utility model and FRA adopts and mixes the mode of amplifying, and utilizes flexibility, the many pumpings flat gain technology of low cost, high-gain and the FRA of EDFA, realizes that at the C+L wave band broadband of signal is amplified.
Summary of the invention
The purpose of this utility model provides the mixed type broadband optical fiber amplifier that a kind of cost is low, gain is high, flexibility is good, for dense wavelength division multiplexing system provides jumbo communication.
The mixed type broadband optical fiber amplifier of the utility model design is connected and composed through circuit by Raman Fiber Amplifier (FRA) 1, erbium-doped fiber amplifier (EDFA) 2, fixed light filter 3 and control section, and its structure as shown in Figure 1.Wherein, FRA is connected by isolator 9, signal source Pu multiplexer 8, Raman gain optical fiber 7, signal/pumping demodulation multiplexer 6, isolator 10 circuit successively, and pump laser array 4 connects to form through many pumpings wave multiplexer 5 and signal/pumping demodulation multiplexer 6; The output of signal/pumping multiplexer 8 connects with attenuator 16, many pumpings demodulation multiplexer 17, p-i-n pipe successively and is connected with controller 19 after array 18 is connected; EDFA is connected by signal/pumping multiplexer 15, Er-doped fiber 14, signal/pumping demodulation multiplexer 13, isolator 12 circuit successively, and pump laser 11 connects to form with signal/pumping multiplexer; The output of signal/pumping multiplexer 15 connects with attenuator 21, p-i-n pipe successively and is connected with controller 19 after array 20 is connected; And controller 19 respectively with FRA in pump laser array 4 be connected with pump laser 1 among the EDFA; Optical filter 3 is connected between the isolator 10 of FRA and the signal of the EDFA/pumping multiplexer 15.
In the utility model, FRA is mainly used in and amplifies L-band (1570nm-1610nm), and EDFA is mainly used in and amplifies C-band (1530nm-1560nm), and combination of them can realize that the broadband of C+L wave band (1530nm-1610nm) is amplified.
In the utility model, controller 19 is common controller, and it includes transducer (A/D) and microprocessor (MCU) etc.
Operation principle of the present utility model is as follows:
Flashlight is realized amplifying through FRA1, optical filter 3, EDFA2 successively.In the process process of FRA1, light signal passes through signal/pumping multiplexer 8, Raman gain optical fiber 7, signal/pumping demodulation multiplexer 6 successively from isolator 9 inputs, then from isolator 10 outputs.In the process process of EDFA2, light signal is from signal/pumping multiplexer 15 inputs, through Er-doped fiber 14, signal/pumping demodulation multiplexer 13, then from isolator 12 outputs.
The step of control action process is as follows:
One, measures pumping source that encourages FRA1 and the residual power that encourages the pumping source of EFDA2 respectively
(1) residual power of the pumping source of excitation FRA1 arrives p-i-n pipe receiving array 18 through attenuator 16 and many pumpings demodulation multiplexer 17; The pumping source residual power of excitation EDFA2 arrives the p-i-n pipe through attenuator 21 and receives 20; The residual power of the pumping source of the residual power of each wavelength of the pumping source of excitation FRA1 and excitation EDFA2 is converted into the corresponding signal of telecommunication.
(2) controller has comprised analog to digital converter (A/D), and the corresponding signal of telecommunication of each wavelength pumping source residual power is changed into digital signal by analog quantity, so that the measurement of microprocessor (MCU) is handled.
(3) MCU preserves the residual power of each wavelength that records.
Two,, adjust each the wavelength pump laser of excitation FRA1 and the power of the pump laser of excitation EDFA2 according to the remnant pump source power of each wavelength that records
(1) controller comprises the control circuit to each pump laser, and it is by MCU control and change the power that each pump laser is exported.
(2) desired each the wavelength residual power of each wavelength residual power that relatively records and flat gain.
(3) each wavelength pump laser of adjustment excitation FRA1 is consistent up to desired each the wavelength residual power of each wavelength residual power that records and flat gain with the power of the pump laser of excitation EDFA2.
Desired each the wavelength residual power of flat gain is by manually being input in the controller.
Description of drawings
The structure chart of the broadband optical fiber amplifier of a kind of mixed type that Fig. 1 provides for the utility model.
Fig. 2 has provided the characteristic gain spectrum of a common EDFA.
Fig. 3 has provided with EDFA corresponding, mainly amplifies the characteristic gain curve of the FRA of L-band.
Fig. 4 has provided in conjunction with the output characteristic with Fig. 2 and Fig. 3 two-stage, resulting amplification output spectral line.
Fig. 5 has provided the fixed light filter attenuation curve that has the gain-smoothing effect with Fig. 4 accordingly.
Fig. 6 is in conjunction with Fig. 4 and Fig. 5 output characteristic, the signal gain curve of resulting C+L wave band.
Embodiment
Further specifically describe the utility model below by drawings and Examples.
Input signal light passes through the broadband amplification that Raman Fiber Amplifier (FRA) 1, fixed light filter 3 and erbium-doped fiber amplifier (EDFA) 2 are realized the C+L wave band successively.FRA partly comprises one group of pump laser array 4, pumping wave multiplexer 5, signal/pumping demodulation multiplexer 6, Raman gain optical fiber 7, signal/pumping multiplexer 8, isolator 9 and 10, and its EDFA partly comprises a pump laser 11, isolator 12, signal/pumping demodulation multiplexer 13, Er-doped fiber 14, signal/pumping multiplexer 15.The circuit of FRA and the circuit of EDFA are with original identical.The typical noise factor of FRA is about 0dB, and the typical noise factor of EDFA is about 5dB, so flashlight now passes through EDFA again through FRA, can make this fiber amplifier have better noise characteristic.Fixed light filter of cascade in the middle of two fiber amplifiers makes the gain in the signal in band more level and smooth.Its structure is seen shown in Figure 1.
In the FRA part, constitute the pump laser array by N (12 〉=V＞1) pump laser (Laser Diode), after ripple is closed in pumping all energy of lasers are coupled as the exciting light source of FRA, this exciting light source is delivered to Raman gain optical fiber 7 through signal/pumping demodulation multiplexer 6.All optical fiber all has the excited Raman effect, can be as Raman gain optical fiber.The utility model can adopt dispersion compensating fiber (DCF) as the discrete fiber amplifier, can carry out dispersion compensation like this, and bigger Raman gain is arranged again.The other end at gain fibre 7 after the transmission of exciting light source process Raman gain optical fiber is coupled away by signal/pumping multiplexer 8, becomes the remaining exciting light that FRA uses.This residual light is by behind the corresponding attenuator 16, isolate and the remaining exciting light in each pumping wavelength corresponding N road of pump laser array by many pumpings demodulation multiplexer 17, detect the residual light power of each pumping wavelength by p-i-n pipe receiving array 18 then, and export the corresponding signal of telecommunication.Controller 19 comprises the reception to residual light power corresponding electric signal, and according to the residual light power of each wavelength the power of each road pumping laser in the pump laser array is controlled, with the gain curve in the level and smooth corresponding signal bandwidth.
Accordingly in the EDFA part, the EDFA of pump laser 11 outputs delivers in the Er-doped fiber 14 through signal/pumping demodulation multiplexer 13 with exciting light, after transmitting,, be coupled away, become the remnant pump light that EDFA uses by signal/pumping multiplexer 15 at the other end of Er-doped fiber.This residual light receives the power that detects this pumping residual light by p-i-n pipe 20, and exports the corresponding signal of telecommunication by behind the corresponding attenuator 21.Controller 19 receives these signals of telecommunication, and the power of the pump laser of EDFA being used according to the pumping residual light power that records controls, with the gain curve in the level and smooth corresponding signal bandwidth.
Fig. 2 has provided the characteristic gain spectrum of a common EDFA.EDFA can produce very high signal gain as seen from the figure, but its gain peak is fixed, peak wavelength changes between 1530nm and 1535nm greatly, and its smooth gain spectrum width is narrower, therefore the 3dB gain bandwidth of having only 20nm ~ 30nm must adopt the gain-smoothing technology to enlarge its bandwidth of operation.Owing to being negative at the later signal gain slope of 1560nm,, then just in time can realize the broadband amplification as long as the signal gain slope is that positive amplifier compensates after the employing 1560nm to EDFA.Consider that FRA can amplify the signal of any wave band, therefore, FRA and the EDFA cascade mutually of adopting gain and EDFA to adapt.
That Fig. 3 has provided is corresponding with EDFA in the present embodiment, mainly amplify the characteristic gain curve of the FRA of L-band.Adapt with Fig. 2, FRA is from short wavelength to 1600nm, and its gain slope is for just.In the present embodiment, adopted the pump laser array of N=2 among the FRA, promptly the exciting light source used of FRA is a pair of wavelength excitation source.Compare with document 1, the utility model greatly reduces the quantity of required pump laser among the FRA, and the control of flat gain is more prone to, and also greatly reduces cost.
Fig. 4 has provided in conjunction with the output characteristic with figure (2) and figure (3) two-stage, resulting signal output spectral line.To between the 1600nm, its gain slope is compensation mutually just in time at 1560nm for the gain curve of EDFA and FRA.But because the gain slope of the unevenness of EDFA gain spectrum and EDFA and FRA and incomplete coupling, therefore, the gain curve in its broadband is still unsmooth.
Fig. 5 has provided the fixed light filter attenuation curve that has the gain-smoothing effect in the present embodiment with Fig. 4 accordingly.Owing to the signal gain curve of the two-stage output characteristic that EDFA and FRA are singly arranged is still level and smooth inadequately in the broadband, therefore adopt the fixed light filter to make the gain in the signal in band more level and smooth.The fixed light filter is arranged on after the FRA rather than before, avoids signal light power to fall lowly excessively before arriving fiber amplifier, thereby reduce signal to noise ratio, influences transmission performance; And the power that makes input signal light satisfies the requirement of EDFA to input optical power, and its requirement has comprised 2 points: the one, and make input signal light power satisfy the requirement of gain-smoothing; The signal light power of on the other hand avoiding importing EDFA is excessive, satisfies and reduces the saturated requirement of power among the EDFA as far as possible.In the present embodiment, the fixed light filter has adopted the form of 3 Gaussian optical filters cascade.
Fig. 6 has provided in the present embodiment in conjunction with Fig. 4 and Fig. 5 output characteristic, the fes signal output benefit curve that the C+L wave band that obtains at last is level and smooth.
The utility model combines the advantage of FRA and EDFA, and the complementarity of utilizing both gain curves has realized the broadband amplification of C+L wave band, significantly reduced the required pump laser number of gain-smoothing simultaneously, thereby the gain-smoothing that makes control is more prone to, and has also reduced the complexity and the cost of overall optical amplifier architecture.
Claims (6)
1, a kind of mixed type broadband optical fiber amplifier, it is characterized in that connecting and composing through circuit by Raman Fiber Amplifier (FRA) (1), erbium-doped fiber amplifier (EDFA) (2), fixed light filter (3) and control section, wherein, FRA is connected by isolator (9), signal source Pu multiplexer (8), Raman gain optical fiber (7), signal/pumping demodulation multiplexer (6), isolator (10) circuit successively, and pump laser array (4) connects to form through many pumpings wave multiplexer (5) and signal/pumping demodulation multiplexer (6); The output of signal/pumping multiplexer (8) connects with attenuator (16), many pumpings demodulation multiplexer (17), p-i-n pipe successively and is connected with controller (19) after array (18) is connected; EDFA is connected by signal/pumping multiplexer (15), Er-doped fiber (14), signal/pumping demodulation multiplexer (13), isolator (12) circuit successively, and pump laser (11) connects to form with signal/pumping multiplexer; The output of signal/pumping multiplexer (15) connects with attenuator (21), p-i-n pipe successively and is connected with controller (19) after array (20) is connected; And controller (19) respectively with FRA in pump laser array (4) be connected with pump laser (1) among the EDFA; Optical filter (3) is connected between the isolator (10) of FRA and the signal of the EDFA/pumping multiplexer (15).
2, fiber amplifier according to claim 1, it is characterized in that flashlight passes through Raman Fiber Amplifier, fixed light filter and erbium-doped fiber amplifier (2) successively and realizes the amplification of C+L wave band broadband, wherein Raman Fiber Amplifier mainly amplifies L-band, and erbium-doped fiber amplifier mainly amplifies C-band.
3, fiber amplifier according to claim 2, it is characterized in that including in the pump laser array (4) N pump laser, after many pumpings wave multiplexer closes ripple, take the mode of reverse energization, send into Raman gain optical fiber (7), 1＜N≤12 by signal/pumping demodulation multiplexer (6).
4, fiber amplifier according to claim 2 is characterized in that adopting dispersion compensating fiber as its Raman gain optical fiber of separate amplifier.
5, fiber amplifier according to claim 1 is characterized in that the remnant pump luminous power that FRA uses receives measurement through attenuator (6), many pumpings demodulation multiplexer (7) back by p-i-n pipe receiving array (18); The remnant pump luminous power that EDFA uses is received by p-i-n pipe (20) through attenuator (21) back and measures.
6, fiber amplifier according to claim 1, it is characterized in that control section is accepted array according to the p-i-n pipe respectively and p-i-n manages remaining FRA exciting light power and the EDFA exciting light power that acceptance records, control the pump laser array of FRA excitation usefulness and the pump laser of EDFA excitation usefulness respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU032552750U CN2631132Y (en) | 2003-07-03 | 2003-07-03 | Mixed broadband optical fiber amplifier |
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| Application Number | Priority Date | Filing Date | Title |
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| CNU032552750U CN2631132Y (en) | 2003-07-03 | 2003-07-03 | Mixed broadband optical fiber amplifier |
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| CNU032552750U Expired - Fee Related CN2631132Y (en) | 2003-07-03 | 2003-07-03 | Mixed broadband optical fiber amplifier |
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| CN100416396C (en) * | 2006-08-10 | 2008-09-03 | 浙江大学 | Method and apparatus for multi-wavelength stable output of line type structure optical fiber laser |
| US7924497B2 (en) | 2006-09-21 | 2011-04-12 | Tyco Electronics Subsea Communications Llc | System and method for gain equalization and optical communication system incorporating the same |
| CN102843192A (en) * | 2012-09-05 | 2012-12-26 | 武汉光迅科技股份有限公司 | Hybrid optical fiber amplifier as well as method and device for adjusting gain and gain slope of amplifier |
| CN103580754A (en) * | 2012-07-19 | 2014-02-12 | 菲尼萨公司 | Hybrid optical amplifier with optimized noise figure |
| CN104821481A (en) * | 2015-05-15 | 2015-08-05 | 中国电子科技集团公司第八研究所 | Mixed discrete-type high-nonlinearity optical fiber amplifier based on double-feedback structure |
| CN105207719A (en) * | 2015-08-25 | 2015-12-30 | 武汉光迅科技股份有限公司 | Cascaded Hybrid amplifier control method and system |
| CN107124224A (en) * | 2017-06-22 | 2017-09-01 | 武汉光迅科技股份有限公司 | A kind of adaptive wave band amplification method and amplifier |
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| CN100416396C (en) * | 2006-08-10 | 2008-09-03 | 浙江大学 | Method and apparatus for multi-wavelength stable output of line type structure optical fiber laser |
| US7924497B2 (en) | 2006-09-21 | 2011-04-12 | Tyco Electronics Subsea Communications Llc | System and method for gain equalization and optical communication system incorporating the same |
| CN101517847B (en) * | 2006-09-21 | 2012-02-01 | 泰科电子海底通信有限责任公司 | System and method for gain equalization and optical communication system incorporating the same |
| CN103580754B (en) * | 2012-07-19 | 2018-04-27 | 菲尼萨公司 | Hybrid optical amplifier with optimization noise coefficient |
| CN103580754A (en) * | 2012-07-19 | 2014-02-12 | 菲尼萨公司 | Hybrid optical amplifier with optimized noise figure |
| CN102843192B (en) * | 2012-09-05 | 2016-05-11 | 武汉光迅科技股份有限公司 | The method of adjustment of Now therefore to all whom it may concern and gain thereof, gain slope and device |
| WO2014036764A1 (en) * | 2012-09-05 | 2014-03-13 | 武汉光迅科技股份有限公司 | Hybrid fiber amplifier and method for adjusting gain and gain slope thereof |
| CN102843192A (en) * | 2012-09-05 | 2012-12-26 | 武汉光迅科技股份有限公司 | Hybrid optical fiber amplifier as well as method and device for adjusting gain and gain slope of amplifier |
| US9722559B2 (en) | 2012-09-05 | 2017-08-01 | Accelink Technologies Co., Ltd. | Hybrid fiber amplifier and method for adjusting gain and gain slope thereof |
| CN104821481B (en) * | 2015-05-15 | 2017-08-25 | 中国电子科技集团公司第八研究所 | A kind of mixing discrete highly nonlinear optical fiber amplifier based on double feedback arrangements |
| CN104821481A (en) * | 2015-05-15 | 2015-08-05 | 中国电子科技集团公司第八研究所 | Mixed discrete-type high-nonlinearity optical fiber amplifier based on double-feedback structure |
| US10686525B2 (en) | 2015-08-25 | 2020-06-16 | Accelink Technologies Co., Ltd. | Control method and system for cascade hybrid amplifier |
| CN105207719B (en) * | 2015-08-25 | 2017-06-27 | 武汉光迅科技股份有限公司 | The control method and system of Cascade H ybrid amplifiers |
| CN105207719A (en) * | 2015-08-25 | 2015-12-30 | 武汉光迅科技股份有限公司 | Cascaded Hybrid amplifier control method and system |
| CN107124224A (en) * | 2017-06-22 | 2017-09-01 | 武汉光迅科技股份有限公司 | A kind of adaptive wave band amplification method and amplifier |
| CN107124224B (en) * | 2017-06-22 | 2019-06-14 | 武汉光迅科技股份有限公司 | A kind of adaptive wave band amplification method and amplifier |
| JP2021535610A (en) * | 2018-08-30 | 2021-12-16 | オーエフエス ファイテル，エルエルシー | Wide Gain Bandwidth C-Band Fiber Optic Amplifier |
| JP7387721B2 (en) | 2018-08-30 | 2023-11-28 | オーエフエス ファイテル，エルエルシー | Wide gain bandwidth C-band optical fiber amplifier |
| WO2021232782A1 (en) * | 2020-05-21 | 2021-11-25 | 武汉光迅科技股份有限公司 | Hybrid fiber amplifier, optical signal amplification method, and optical communication system |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20040804 Termination date: 20110703 |