CN102495510A - Gain flat type high-power optical fiber amplifier based on optical fiber loop mirror - Google Patents
Gain flat type high-power optical fiber amplifier based on optical fiber loop mirror Download PDFInfo
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- CN102495510A CN102495510A CN2011104063434A CN201110406343A CN102495510A CN 102495510 A CN102495510 A CN 102495510A CN 2011104063434 A CN2011104063434 A CN 2011104063434A CN 201110406343 A CN201110406343 A CN 201110406343A CN 102495510 A CN102495510 A CN 102495510A
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Abstract
The invention belongs to the technical field of optical fiber amplifiers, and particularly relates to a gain flat type high-power optical fiber amplifier based on an optical fiber loop mirror. The gain flat type high-power optical fiber amplifier is sequentially composed of a signal light source, a first optical isolator, a wavelength division multiplexer, a 980nm single mode pump source, erbium-doped optical fibers, a second optical isolator, a pump coupler, a 975nm multimode pump source, erbium and ytterbium codoping double-coated optical fibers, a three-port annular device and the optical fiber loop mirror. The optical fiber loop mirror comprises two sections of polarization maintaining optical fibers with the beat length of 3.9mm, two three-ring shaped polarization controllers and a 2X2 beam splitter with the splitting ratio of 50/50. Compared with a general optical fiber amplifier, the gain flat type high-power optical fiber amplifier based on the optical fiber loop mirror can achieve gain flatness under high power output, and is an all-optical component.
Description
Technical field
The invention belongs to the fiber amplifier technical field, be specifically related to a kind of flat gain type high-power fiber amplifier based on fiber loop mirror.
Background technology
Consider by the professional data traffic that produces of Internet access, multiple phone line road, teleconference, data and video transmission; The network bandwidth that the user uses and the estimation of the existing design initial network bandwidth are greatly different, and operators need a large amount of network capacitys to satisfy growing demand for services urgently.The problem that also need solve in addition is exactly how could be in a kind of physical network deploy and the integrated multiple communication technology.That is to say under consumer's needs and the competitive pressure between the enterprise; Operator will be provided at both economical multiple service on construction and the operation cost on the one hand, also will on the existing network basis of having buried underground, dispose these business as much as possible on the other hand.Dense wave division multipurpose (DWDM) technology provides the feasible solution that satisfies these demands simultaneously just.The DWDM technology can effectively utilize bandwidth of an optical fiber to realize high capacity, long-distance optical fiber communication; Can in user allocation system, increase number of services; In addition because the characteristics of " transparence " of its transmission link, can be equal for different transmission modes unified bandwidth management capability is provided.Because the use of DWDM technology makes that the power in the simple optical fiber is very high, so just need high-power fiber amplifier to carry out relaying and amplify.
DWDM technology is exactly the transmission of arranging in pairs or groups of a plurality of light signals, and these light signals are weaved into same group and are exaggerated simultaneously and through single Optical Fiber Transmission, the bandwidth of network has also just increased greatly.And in such DWDM technology, realize the transmission of multi-wavelength and extra long distance just needing amplifier to have wide flat gain scope.Some performance deficiency of traditional fiber amplifier---the heteropical influence of gain spectral just further significantly comes out.Because the uneven phenomenon of gain; When a plurality of fiber amplifier cascade; The gain inequality mutation of different wave length channel is big; Thereby cause those little optical channels of channel gain to produce very big error code, will certainly influence the transmission range of system like this, therefore be necessary to carry out smooth the gain spectral of fiber amplifier.
At present, the method for flat gain mainly contains: photodetection-circuit gain monitoring adjusting method (CN101414731A is used for the apparatus and method that smooth light amplifier gain is composed); Insert loss spectra fiber grating method (the Broad-band Erbium-Doped Fiber Amplifier Flattened Beyound 40nm Using Long-Period Grating Filter.Paul F.Wysock opposite with gain spectral; Et.al., IEEE Photo.Tech.Lett., 1997; 9 (10): 1343); Photodetection-circuit gain monitoring adjusting method is owing to introduced circuit working when working in the light territory, and device can run into electronic bottleneck when high speed operation, and is unfavorable for integrated; The smooth method of optical fibre raster gain is static flat gain technology, can make the flatness reduction during online applications.
Along with being widely used of Optical Access Network, the high-power fiber amplifier that can carry more users simultaneously comes into one's own owing to having the advantage that reduces the single household cost of access.Therefore study high power amplifier and become DWDM Study on Technology theme with flat gain spectrum.
Summary of the invention
The objective of the invention is deficiency to prior art; A kind of flat gain type high-power fiber amplifier based on fiber loop mirror is proposed; Er-doped fiber, erbium ytterbium co doped double clad fiber are used in combination with annular mirror, obtain having high-output power, the fiber amplifier of flat gain spectral line.
In order to realize such purpose; The smooth fiber amplifier of the full gain of light of the present invention design is made up of signal optical source 1, first optoisolator 4, wavelength division multiplexer 6,980nm single mode pumping source 2, Er-doped fiber 8, second optoisolator 5, pumping coupler 7,975nm multimode pumping source 3, erbium ytterbium co doped double clad fiber 9, three port circulators 10 and fiber loop mirror 11 successively; The flashlight that signal optical source 1 produces arrives wavelength division multiplexer 6 through first optoisolator 4; The pump light of 980nm single mode pumping source 2 outputs directly gets into wavelength division multiplexer 6; Wavelength division multiplexer 6 outputs to the flashlight and the pump light coupling of input in the fibre core of Er-doped fiber; Flashlight is amplified in advance and (regulates the pump power of 980nm single mode pumping source, make output power＞=30mW) in Er-doped fiber 8 (EDF); Flashlight through Er-doped fiber arrives pumping coupler 7 through second optoisolator 5 again; The light of 975nm multimode pumping source 3 outputs directly gets into pumping coupler 7; Pumping coupler 7 is coupled to the flashlight of input in the fibre core of erbium ytterbium co doped double clad fiber of output terminal and transmits, and the pump light of input is coupled in the covering of erbium ytterbium co doped double clad fiber of output terminal to transmit; Flashlight is further amplified at erbium ytterbium co doped double clad fiber 9; Flashlight after the amplification gets into fiber loop mirror 11 through three port circulators 10; After fiber loop mirror 11 reflections, obtain the amplification light of gain spectrum flattening, by the output terminal output of three port circulators 10.
The used flashlight of the present invention is provided by tunable laser or the single wavelength continuous wave laser of 1550nm; As santec company's T SL-210 tunable optical source (output power is-10dBm～+ 10dBm; Centre wavelength 1550nm; Tuning range 1535nm～1565nm), C-band tunable laser (peak power output 10dBm, the centre wavelength 1550nm of fast sky photoelectricity; Tuning range 1530nm～1560nm) or 41 AV38124 of electronics industry, 1.55 μ m single mode modulated laser light sources (operation wavelength 1550nm, output power 0.25mW～1.2mW).
It is 980nm that 980nm single mode pumping source is selected operation wavelength; Maximum output single-mode laser power is greater than the single mode pumping source of 120mW; Like the LU0980M150 of Lumics company (peak power output 150mW), the general scientific and technological LSB-PUMP-980 single mode pump laser of Beijing CTC (Centell Technology Corporation) light (peak power output 850mW).
975nm multimode pumping source is selected the multimode pump laser of the highest Output optical power greater than 4W; Like the bright prosperous scientific and technological 975nm fiber laser MXLS-0975 in Shenzhen (maximum power output 5.5W), the general LSB-PUMP-975 high power of Beijing CTC (Centell Technology Corporation) light multimode pumping source (maximum power output 6W).
It is 1550nm that optoisolator is selected operation wavelength, and maximum carrying luminous power gets final product more than or equal to the polarization independent type optical isolator of 300mW, like Shanghai vast space 1550nm polarization independent optical isolator, the IS-1550-P of ADF company optoisolator etc.
Three port circulators 10 are selected operation wavelength 1550nm, and the maximum three port circulators that carry luminous power 1000mW are like the vast space PIOC3-15-P in Shanghai, the fast CIR-3-1550-P of Wuhan light etc.
The spectroanalysis instrument (OSA) that can adopt the luminous power and the calculated gains of power meter (integrating sphere) test output signal, also available front end to add attenuator at the output terminal of three port circulators 10 detects amplifying signal light.
During design fiber loop mirror 11; At first to measure the spontaneous emission spectrum of the fiber amplifier (not comprising annular mirror) that contains the two-stage amplification system; Shape according to spontaneous emission spectrum designs fiber loop mirror, and purpose is to make reflectance spectrum and the spontaneous emission spectrum of fiber loop mirror complementary, wherein the position of reflection peak in the length of the polarization maintaining optical fibre decision reflectance spectrum in the annular mirror; The change in depth of the reflection peak of the state decision fiber loop mirror of Polarization Controller; That is to say through regulating these two parameters to make that the reflectivity of the wavelength that corresponding output power is big is low that the reflectivity of the wavelength that corresponding output power is little is high, realizes that at last Amplifier Gain is smooth.
Compare with common fiber amplifier, the present invention can realize the flat gain under the high power output, and is full optical device.
Description of drawings
Fig. 1: the structural representation of the smooth high-power fiber amplifier of the full gain of light of the present invention;
Each component names is: signal optical source 1, first optoisolator 4, wavelength division multiplexer 6,980nm single mode pumping source 2, Er-doped fiber 8, second optoisolator 5, pumping coupler 7,975nm multimode pumping source 3, erbium ytterbium co doped double clad fiber 9, three port circulators 10 and fiber loop mirror 11;
Fig. 2: the annular mirror structural representation that uses in the embodiment of the invention 1;
Fig. 3: the annular mirror structural representation that uses in the embodiment of the invention 2;
Fig. 4: the absorption spectra of employed EDF in the instance of the present invention;
As can be seen from Figure 4, the absorption peak of Er-doped fiber (EDF) is positioned near the 980nm, so the centre wavelength of the pump light of selecting is 980nm;
Fig. 5: employed length is about the EYDF absorption spectra of 4m in the instance of the present invention;
As can be seen from Figure 5, the absorption peak of erbium ytterbium co doped double clad fiber (EDF) is positioned near the 975nm, so the centre wavelength of the pump light of selecting is 975nm;
Fig. 6: two-stage amplifier does not pass through the gain spectral (ASE spectrum) of annular mirror when smooth;
The gain spectral of last output behind the two-stage amplifier process annular mirror flat gain among Fig. 7: the embodiment 1;
The gain spectral of last output behind the two-stage amplifier process annular mirror flat gain among Fig. 8: the embodiment 2.
Embodiment
Below in conjunction with accompanying drawing and embodiment technical scheme of the present invention is further described.
Embodiment 1:
In the present embodiment, tunable laser 1 is used santec company's T SL-210 tunable optical source, and output power is-10dBm～+ 10dBm, operation wavelength 1550nm; 980nm single mode pumping source 2 is selected the LU0980M150 of Lumics company for use, and operation wavelength is 980nm, and maximum output single-mode laser power is 150mW; The bright prosperous scientific and technological 975nm semiconductor laser MXLS-0975 in 975nm multimode pumping source 3 use Shenzhen, operation wavelength is 975nm, maximum power output is 5.5W; Two isolators 4 and 5 use Shanghai vast space 1550nm polarization independent optical isolator, operation wavelength is 1550nm, it is maximum that to carry luminous power be 300mW; Wavelength division multiplexer 6 employing Shanghai vast space fused tapered 980/1550nm pump light wavelength division multiplexer; Pumping coupler 7 adopts Non-PM type (2+1) * 1 multimode pumping+signal light combiner of ITF company; Er-doped fiber (EDF) 8 is selected Nufern EDFC-980-HP C-band for use, and length is 5～10 meters; Erbium ytterbium co doped double clad fiber 9 is selected Nufern EYDF-7/130 for use, and length is 3～4 meters; Fiber loop mirror 11 is by F
1(0.5 meter) and F
2(1.2 meters) two sections are clapped long the be polarization maintaining optical fibre of 3.9mm (Nufern PM 1550-HP polarization-maintaining fiber), two three annular polarization controller (PC
1And PC
2, the MPC-1-0 of ProtoDel company) to form with 50: 50 2 * 2 beam splitters of a splitting ratio (three-dB coupler, vast space WIC-2X2-1550-50/50), its structure and connected mode are as shown in Figure 2.
Connected mode of the present invention is: the flashlight (10dBm～10dBm) (make the flashlight one way propagation through isolator 4 that is provided by tunable laser 1; Prevent the flashlight infringement signal source that end face reflection returns) be connected with wavelength division multiplexer 6, the pump light of 980nm single mode pumping source 2 outputs gets into wavelength division multiplexer 6.Wavelength-division multiplex 6 is coupled into Er-doped fiber (EDF) 8 with the flashlight and the 980nm single mode pump light of input; (pump power of regulating 980nm single mode pumping source makes preparatory amplification output power＞30mW) in EDF, to carry out the preparatory amplification of signal; Obtain preliminary amplifying signal light through isolator 5 (the reverse ASE that can effectively suppress EYDF; Make it can not get into EDF; Reduce the consumption of pump power on reverse ASE at preparatory amplifier stage place, make the more effective energy that converts flashlight to of pump light) link to each other with the signal input part of pumping coupler 7, the pumping input end of pumping coupler 7 is connected with 975nm multimode pumping source 3; And the output terminal of pumping coupler 7 links to each other with erbium ytterbium co doped double clad fiber 9; Flashlight further amplifies at erbium ytterbium co doped double clad fiber 9; Flashlight after the amplification gets into three port circulators 10 through 1. holding; Enter into fiber loop mirror 11 via the output of the 2. port of circulator 10, the 3. port output through fiber loop mirror 11 reflection backs by circulator 10, the flashlight of output this moment is through the two-stage amplification and by annular mirror and carries out the flashlight behind the flat gain.
The Er-doped fiber that adopts among the embodiment (EDF) and erbium ytterbium co doped double clad fiber (EYDF) absorption spectra such as Fig. 3 and shown in Figure 4.As can be seen from the figure; The absorption peak of Er-doped fiber and erbium-ytterbium co-doped fiber is respectively 980nm, 975nm; So when in this example light signal being amplified, use the pump laser of different centre wavelengths (980nm or 975nm) to different Active Optical Fiber (EDF and EYDF).
As input signal light, input signal wavelength 1550nm during power 0dBm (1mW), is about 29.13dBm (820mW) with integrating sphere test output terminal output power by tunable laser, and gain is about 29dB.
Can describe by the ASE spectral line because the Amplifier Gain spectrum is approximate, so the present invention will observe the smooth effect of Amplifier Gain through the variation of observing the ASE spectral line.With existing ordinary optic fibre amplifier (like EDFA output power＜50mW; Unevenness degree 8～10dB, as shown in Figure 6) compare, the present invention realizes the high-output power (flat gain (uneven degree＜2.5dB under the output power＞800mW); As shown in Figure 7), and be full optical device.
Embodiment 2:
The formation of fiber loop mirror 11 changed into only adopt one section to clap the long Nufern PM1550-HP polarization maintaining optical fibre F of 3.9mm that is
1(0.5 meter), three annular polarization controller (PC
1) and 50: 50 2 * 2 beam splitters (three-dB coupler) of a splitting ratio, its structure and connected mode are as shown in Figure 3.Other conditions are with embodiment 1.
Gain spectral through behind this annular mirror is as shown in Figure 8, and the uneven degree of 1539nm～1546nm wavelength period is in 0.8dB.
Compare with embodiment 1, though the flatness of whole wave band not as embodiment 1, when only needing the L-band of the smooth wave band of application, embodiment 2 has simple in structure, cost is lower, debug more convenient, and the littler advantage of the gain fluctuation of second half section wavelength.
Claims (9)
1. flat gain type high-power fiber amplifier based on fiber loop mirror; It is characterized in that: form by signal optical source (1), first optoisolator (4), wavelength division multiplexer (6), 980nm single mode pumping source (2), Er-doped fiber (8), second optoisolator (5), pumping coupler (7), 975nm multimode pumping source (3), erbium ytterbium co doped double clad fiber (9), three port circulators (10) and fiber loop mirror (11) successively; The flashlight that signal optical source (1) produces arrives wavelength division multiplexer (6) through first optoisolator (4); The pump light of 980nm single mode pumping source (2) output directly gets into wavelength division multiplexer (6); Wavelength division multiplexer (6) outputs to flashlight and pump light coupling in the fibre core of Er-doped fiber (8), and flashlight is amplified in advance in Er-doped fiber 8; Flashlight through Er-doped fiber (8) arrives pumping coupler (7) through second optoisolator (5) again; The pump light of 975nm multimode pumping source (3) output directly gets into pumping coupler (7); Pumping coupler (7) is coupled to the flashlight of input in the fibre core of erbium ytterbium co doped double clad fiber (9) of output terminal and transmits, and the pump light of input is coupled in the covering of erbium ytterbium co doped double clad fiber (9) of output terminal to transmit; Flashlight is further amplified at erbium ytterbium co doped double clad fiber (9); Flashlight after the amplification gets into fiber loop mirror (11) through three port circulators (10); After fiber loop mirror (11) reflection, obtain the amplification light of gain spectrum flattening, by the output terminal output of three port circulators (10).
2. a kind of flat gain type high-power fiber amplifier based on fiber loop mirror as claimed in claim 1 is characterized in that: signal optical source (1) adopts tunable laser or the single wavelength continuous wave laser of 1550nm.
3. a kind of flat gain type high-power fiber amplifier based on fiber loop mirror as claimed in claim 1 is characterized in that: it is 980nm, the maximum single mode pumping source of exporting single-mode laser power greater than 120mW that 980nm single mode pumping source (2) is selected operation wavelength.
4. a kind of flat gain type high-power fiber amplifier based on fiber loop mirror as claimed in claim 1 is characterized in that: 975nm multimode pumping source (3) is selected the multimode pump laser of the highest Output optical power greater than 4W.
5. a kind of flat gain type high-power fiber amplifier as claimed in claim 1 based on fiber loop mirror; It is characterized in that: optoisolator (4,5) selection operation wavelength is 1550nm, the maximum polarization independent type optical isolator that carries luminous power more than or equal to 300mW.
6. a kind of flat gain type high-power fiber amplifier based on fiber loop mirror as claimed in claim 1 is characterized in that: three port circulators (10) are selected operation wavelength 1550nm, the maximum three port circulators that carry luminous power 1000mW.
7. a kind of flat gain type high-power fiber amplifier as claimed in claim 1 based on fiber loop mirror; It is characterized in that: adopt the luminous power and the calculated gains of power meter test output signal at the output terminal of three port circulators (10), or the spectroanalysis instrument that adopts front end to add attenuator detects amplifying signal light.
8. a kind of flat gain type high-power fiber amplifier based on fiber loop mirror as claimed in claim 1 is characterized in that: it is the polarization maintaining optical fibre (F of 3.9mm that fiber loop mirror (11) is clapped length by two sections
1, F
2), two three annular polarization controller (PC
1, PC
2) and 50: 50 2 * 2 beam splitters of splitting ratio composition, the length of first section polarization maintaining optical fibre is 0.5 meter, the length of second section polarization maintaining optical fibre is 1.2 meters, polarization maintaining optical fibre (F
1), three annular polarization controller (PC
1), polarization maintaining optical fibre (F
2), three annular polarization controller (PC
2) be connected in order with beam splitter.
9. a kind of flat gain type high-power fiber amplifier based on fiber loop mirror as claimed in claim 1 is characterized in that: it is the polarization maintaining optical fibre (F of 3.9mm that fiber loop mirror (11) is clapped length by one section
1), three annular polarization controller (PC
1) and 50: 50 2 * 2 beam splitters of a splitting ratio connect to form in order, the length of polarization maintaining optical fibre is 0.5 meter.
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| CN2011104063434A CN102495510A (en) | 2011-12-08 | 2011-12-08 | Gain flat type high-power optical fiber amplifier based on optical fiber loop mirror |
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|---|---|---|---|
| CN2011104063434A CN102495510A (en) | 2011-12-08 | 2011-12-08 | Gain flat type high-power optical fiber amplifier based on optical fiber loop mirror |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103794983A (en) * | 2014-01-27 | 2014-05-14 | 吉林大学 | All-optical gain control gain flatness type high-power optical fiber amplifier |
| CN104659639A (en) * | 2013-11-21 | 2015-05-27 | 上海瀚宇光纤通信技术有限公司 | High-power optical fiber amplifier with high heat dissipation rate |
| CN105656561A (en) * | 2016-03-21 | 2016-06-08 | 吉林大学 | Double-ring feedback gain flattening erbium-doped optical fiber amplifier |
| CN106464378A (en) * | 2014-03-10 | 2017-02-22 | 菲尼萨公司 | Communication over multimode and single mode fiber |
| 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 |
| CN110311731A (en) * | 2019-06-27 | 2019-10-08 | 中国电子科技集团公司第十三研究所 | Scanning light source output gain flatness lifting device and scanning light source |
| CN111245516A (en) * | 2020-01-10 | 2020-06-05 | 广东工业大学 | Optical fiber amplifier |
-
2011
- 2011-12-08 CN CN2011104063434A patent/CN102495510A/en active Pending
Non-Patent Citations (2)
| Title |
|---|
| SHENPING LI, K. S. CHIANG, AND W. A. GAMBLING: "《Gain Flattening of an Erbium-Doped Fiber Amplifier Using a High-Birefringence Fiber Loop Mirror》", 《IEEE PHOTONICS TECHNOLOGY LETTERS》 * |
| Y. JEONG, J. K. SAHU, D. B. S. SOH, C. A. CODEMARD ET.AL: "《High-power tunable single-frequency single-mode erbium:ytterbium codoped large-core fiber master-oscillator power amplifier source》", 《OPTICS LETTERS》 * |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104659639A (en) * | 2013-11-21 | 2015-05-27 | 上海瀚宇光纤通信技术有限公司 | High-power optical fiber amplifier with high heat dissipation rate |
| CN103794983A (en) * | 2014-01-27 | 2014-05-14 | 吉林大学 | All-optical gain control gain flatness type high-power optical fiber amplifier |
| CN106464378A (en) * | 2014-03-10 | 2017-02-22 | 菲尼萨公司 | Communication over multimode and single mode fiber |
| CN105656561A (en) * | 2016-03-21 | 2016-06-08 | 吉林大学 | Double-ring feedback gain flattening erbium-doped optical fiber amplifier |
| 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 |
| CN110311731A (en) * | 2019-06-27 | 2019-10-08 | 中国电子科技集团公司第十三研究所 | Scanning light source output gain flatness lifting device and scanning light source |
| CN111245516A (en) * | 2020-01-10 | 2020-06-05 | 广东工业大学 | Optical fiber amplifier |
| CN111245516B (en) * | 2020-01-10 | 2022-04-19 | 广东工业大学 | Optical fiber amplifier |
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Application publication date: 20120613 |