CN1540429A - L wave band bipass optical fiber amplifier with erbium being adulterated enhanced by optical fiber grating - Google Patents
L wave band bipass optical fiber amplifier with erbium being adulterated enhanced by optical fiber grating Download PDFInfo
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- CN1540429A CN1540429A CNA2003101083041A CN200310108304A CN1540429A CN 1540429 A CN1540429 A CN 1540429A CN A2003101083041 A CNA2003101083041 A CN A2003101083041A CN 200310108304 A CN200310108304 A CN 200310108304A CN 1540429 A CN1540429 A CN 1540429A
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Abstract
The invention includes optical circulator, reflector of optical fiber, fiber Bragg grating, 980nm/1550nm wavelength selection coupler, erbium adulterated fiber, 980nm pump laser, tunable laser and spectrum analyzer. Parts connections are as following: output of tunable laser connected to a port of optical circulator; b port of optical circulator connected to Bragg grating, and another end of Bragg grating connected to 1550nm port of wavelength selection coupler, and 980nm port of wavelength selection coupler connected to 980nm pump laser etc. In the invention, using lower pump power and shorter erbium adulterated fiber obtains high small signal gain and low noise label. Changing reflected wavelength of Bragg grating and selecting proper reflected wavelength and reflectivity would optimize performances further.
Description
Technical field
What the present invention relates to is a kind of Erbium-Doped Fiber Amplifier (EDFA), the L-band bilateral Erbium-Doped Fiber Amplifier (EDFA) that particularly a kind of fiber grating strengthens.Belong to the optical communication field.
Background technology
Along with increasing rapidly of Internet data transmission, in system, use L-band (1565nm-1610nm) to become more and more important, the L-band Erbium-Doped Fiber Amplifier (EDFA) has inherent flat gain performance.But because L-band Erbium-Doped Fiber Amplifier (EDFA) operation wavelength is away from the radiation peak of erbium ion, its pump conversion efficiency is quite low.Although some technology can effectively improve the L-band signal gain at present, because higher cost or relatively poor noise figure, effect in actual applications is also little.
Find by literature search, Malaysia's College Physics is S.W.Harun, P.Poopalan, " Gain Enhancement in L-Band EDFA Through a Double-PassTechnique (improving the L-band gain of EDFA by the bilateral technology) " publishes thesis with people such as H.Ahmad, IEEE Photon.Technol.Lett., vol.14, NO.3, MARCH 2002 (being published in the electric Engineering society of U.S. photoelectron technology wall bulletin in March, 2002).The document has reported that the raising of L-band signal gain can realize by the bilateral technology.Promptly the output terminal at Er-doped fiber connects a circulator, and amplifying signal is carried out the secondary amplification along importing Er-doped fiber in the other direction once more, and final amplifying signal utilizes the 3rd output port of first circulator to insert spectroanalysis instrument and measures.This structure uses the 980nm pump laser of 98mW and the long erbium ion concentration of 50m as the Er-doped fiber of 400ppm, compares with the single-pass structure, when the 1570nm of input-20dBm flashlight, can improve the about 11dB of gain, the about 2dB of noise figure deterioration.Higher because of its noise figure, especially when pump power was lower, when pump power was 60mW, the noise figure of 1580nm signal was up to 10dB.This is very disadvantageous in some application scenario.
Summary of the invention
The objective of the invention is to overcome deficiency of the prior art, the L-band bilateral Erbium-Doped Fiber Amplifier (EDFA) that provides a kind of fiber grating to strengthen makes it have the characteristics of low-cost and high-performance.The present invention improves the gain of L-band signal and the noise figure of reduction signal by inserting a Fiber Bragg Grating FBG in the bilateral light channel structure, thereby solve above-mentioned two problems that are present in traditional L-band Erbium-Doped Fiber Amplifier (EDFA), promptly can effectively improve the gain of L-band, thereby since optical grating reflection a part of C-band spontaneous radiation suppressed back to spontaneous radiation, can obtain lower noise figure, the more important thing is that the cost of system can effectively be reduced.
The present invention is achieved by the following technical solutions, the present invention includes: optical circulator, fiber reflector, Fiber Bragg Grating FBG, the 980nm/1550nm wavelength selective coupler, Er-doped fiber, the 980nm pump laser, tunable laser, spectroanalysis instrument, its connected mode is: the output of tunable laser is connected to a port of optical circulator, the b port of optical circulator is connected to Fiber Bragg Grating FBG, the other end of Fiber Bragg Grating FBG is connected to the 1550nm port of 980nm/1550nm wavelength selective coupler, the 980nm port of 980nm/1550nm wavelength selective coupler then connects the 980nm pump laser, the other end of wavelength selective coupler connects Er-doped fiber, the other end of Er-doped fiber connects fiber reflector, and the c port output of optical circulator is connected to spectroanalysis instrument.
The used flashlight of the present invention is provided by tunable laser, also can provide by the fixing single wavelength laser instrument of wavelength, in order to obtain less input signal power, can connect attenuator at the tunable laser output terminal and reduce signal power, optical attenuator can be formed by the coupling mechanism cascade of a plurality of splitting ratios or form by each loss welding optic fibre wire jumper.Flashlight enters the output of b end from circulator a end, Fiber Bragg Grating FBG advances Er-doped fiber with 90% power reflection of the 1553nm light in the C-band spontaneous radiation and amplifies the L-band signal as middle pumping, 1550/980 wavelength selective coupler, flashlight and laser coupled are imported Er-doped fiber together, the 980nm pump light of semiconductor laser diode output 60mw, 1553nmC band of light that fiber reflector will not absorb and the L-band flashlight reflected back Er-doped fiber that is exaggerated carry out secondary to flashlight and amplify, final amplifying signal light enters the output of c end from circulator b end, c port output from optical circulator is connected to spectroanalysis instrument then, and spectroanalysis instrument is used to test the input/output signal luminous power, gain and noise figure.
The reflection wavelength of Fiber Bragg Grating FBG used in the present invention is 1553nm, because 1553nm is lower to the efficiency ratio that the L-band signal transforms, therefore after forward direction passes through Er-doped fiber, except being exaggerated the L-band flashlight, also comprise 1553nm luminous power greatly from the light of Er-doped fiber output.Fiber reflector is with this two parts luminous power while reflected back Er-doped fiber, this moment, pump laser was equivalent to the L-band flashlight is carried out the backward pump amplification, the 1553nm luminous power is then carried out forward direction as additional pumping to the L-band flashlight and is amplified, and is converted into the L-band signal.If use the grating of other reflection wavelength, as to the higher C-band wavelength of L-band conversion of signals efficient, then the signal forward is by behind the Er-doped fiber, the L-band signal that only is exaggerated in the output light, fiber reflector is with flashlight reflected back Er-doped fiber, and pump laser carries out the back to amplification to flashlight.In actual applications, can change the reflection wavelength of Fiber Bragg Grating FBG, select suitable reflection wavelength and reflectivity, the performance of Erbium-Doped Fiber Amplifier (EDFA) can further be optimized.
The parameter of employed pump laser, Er-doped fiber, Fiber Bragg Grating FBG and fiber reflector is not unique, fixing in the structure of the present invention, can do corresponding change as required in actual use, can provide by 980nm pump laser or 1480nm pump laser as pumping laser, and pump power is adjustable; The length of Er-doped fiber can change and can use other doped fiber; Fiber Bragg Grating FBG can be substituted by tunable reflection bandstop filter, can change its reflection wavelength and reflectivity; Fiber reflector can adopt at the terminal plating of Er-doped fiber reflectance coating and realize that an also available optical circulator substitutes.
Compare with traditional L-band Erbium-Doped Fiber Amplifier (EDFA), the present invention can effectively be reduced the cost of Erbium-Doped Fiber Amplifier (EDFA), utilize low pump power and shorter Er-doped fiber can not only obtain higher gain and lower noise figure, and because economic pump power and the Er-doped fiber length used, its cost advantage also is quite tangible.Change the reflection wavelength of Fiber Bragg Grating FBG, select suitable reflection wavelength and reflectivity, the performance of Erbium-Doped Fiber Amplifier (EDFA) can further be optimized.Therefore this structure will be very competitive in the practical application of Erbium-Doped Fiber Amplifier (EDFA).
Description of drawings
Fig. 1 structural representation of the present invention
Embodiment
As shown in Figure 1, the present invention includes: tunable laser 1, optical circulator 2, Fiber Bragg Grating FBG 3,980/1550nm wavelength selective coupler 4,980nm pump laser 5, Er-doped fiber 6, fiber reflector 7, spectroanalysis instrument 8, its connected mode is: optical circulator 2 and fiber reflector 7 constitute dual channel structure, the output of tunable laser 1 is connected to a port of optical circulator 2, the b port of optical circulator 2 is connected to Fiber Bragg Grating FBG 3, the other end of Fiber Bragg Grating FBG 3 is connected to the 1550nm port of 980/1550nm wavelength selective coupler 4, and the 980nm port of 980/1550nm wavelength selective coupler 4 then connects 980nm pump laser 5; The other end of wavelength selective coupler 4 connects Er-doped fiber 6, and the other end of Er-doped fiber 6 connects fiber reflector 7, and the c port output of optical circulator 2 is connected to spectroanalysis instrument 8.
Fiber Bragg Grating FBG 3 or be tunable reflection bandstop filter.Fiber reflector 7 or employing perhaps are an optical circulator at the terminal plating of Er-doped fiber reflectance coating.The length of Er-doped fiber and type are adjusted according to different output power and gain requirements.980nm pump laser 5 or replace by the 1480nm pump laser.Optical attenuator before the tunable laser 1 is formed or is formed by each loss welding optic fibre wire jumper by the coupling mechanism cascade of a plurality of splitting ratios.Tunable laser 1 is wavelength fixing single wavelength or tunable multi-wavelength laser instrument.
The present invention is further illustrated below in conjunction with embodiment:
At first, by coupling arrangement shown in Figure 1, use a tunable laser source that has optical attenuator as the L-band signal input sources.Wherein the reflection wavelength of Fiber Bragg Grating FBG 3 is 1553nm, and reflectivity is 90%, and reflection three dB bandwidth is that the used Er-doped fiber length of 0.2nm is 70m, and concentration of Er is 240ppm.For the ease of understanding advantage of the present invention, also measured the experimental result of other three kinds of structures.Model 1 is a no-raster single-pass structure, and this structure can be by taking out Fiber Bragg Grating FBG in new construction, replaces Fiber Bragg Grating FBG respectively with two optoisolators simultaneously and fiber coupler obtains; Model 2 is that grating single-pass structure is arranged, and this structure is to insert a Fiber Bragg Grating FBG on the basis of model 1; Model 3 is no-raster dual channel structures, and this structure can obtain by directly take out Fiber Bragg Grating FBG from new construction; Model 4 is the grating dual channel structure that has used in the present invention.In model 1 and 2, spectroanalysis instrument is the output port that is connected to second isolator; And in model 3 and 4, spectroanalysis instrument is connected to the 3rd output port of fiber coupler.In this experiment, the measurement structure of all structures all is to carry out under identical experiment condition.The luminous power of input/output signal, gain and noise figure are measured by spectroanalysis instrument.Analyze explanation of the present invention characteristic with different luminous power inputs as embodiment below in conjunction with different wavelength.
Under the pump power condition of 60mW, the 1580nm signal of input-20dBm is measured four kinds of structures.In the model 1,2,3,4, the output power of 1580nm is respectively-16.06dBm ,-4.19dBm ,-8.97dBm, 0.04dBm.The gain of model 1 is very low, has only 4dB, because lower for this structure pumping efficiency.In the model 2, the Fiber Bragg Grating FBG that reflection wavelength is 1553nm has reflected a part of spontaneous radiation and has entered Er-doped fiber as diode pumping.Compare with model 1, the gain of 1580nm has improved about 12dB, but the output power of 1553nm light is quite strong, reaches-9.36dBm, this will influence the reception of L-band signal.If increase the length of Er-doped fiber, the light of 1553nm can be absorbed fully, and is converted into the L-band flashlight of amplification, but this technology is uneconomic.Model 3 utilizes the bilateral technology to amplify the L-band signal, but the back to spontaneous radiation too strong, thereby cause the noise figure of amplifying signal very high.And the structure composition of model 4 model 2 and 3 advantage, in this structure, the gain of 1580nm is up to 20dB, and because FRM absorbs remaining 1553nm light reflected back Er-doped fiber once more, no longer contains this wavelength power in output spectrum.What deserves to be mentioned is because the 1553nm light in the Er-doped fiber into of being reflected has suppressed back to spontaneous radiation, back in the model 4 to the spontaneous radiation power level than model 3 low about 9dB, so this structure while also can obtain lower noise figure.
Claims (7)
1, the L-band bilateral Erbium-Doped Fiber Amplifier (EDFA) that a kind of fiber grating strengthens, comprise: tunable laser (1), optical circulator (2), 980/1550nm wavelength selective coupler (4), 980nm pump laser (5), Er-doped fiber (6), spectroanalysis instrument (8), it is characterized in that also comprising: Fiber Bragg Grating FBG (3), fiber reflector (7), its connected mode is: optical circulator (2) and fiber reflector (7) constitute dual channel structure, the output of tunable laser (1) is connected to a port of optical circulator (2), the b port of optical circulator (2) is connected to Fiber Bragg Grating FBG (3), the other end of Fiber Bragg Grating FBG (3) is connected to the 1550nm port of 980/1550nm wavelength selective coupler (4), the 980nm port of 980/1550nm wavelength selective coupler (4) then connects 980nm pump laser (5), the other end of wavelength selective coupler (4) connects Er-doped fiber (6), the other end of Er-doped fiber (6) connects fiber reflector (7), and the c port output of optical circulator (2) is connected to spectroanalysis instrument (8).
2, the L-band bilateral Erbium-Doped Fiber Amplifier (EDFA) that strengthens of fiber grating according to claim 1 is characterized in that, Fiber Bragg Grating FBG (3) or be tunable reflection bandstop filter.
3, the L-band bilateral Erbium-Doped Fiber Amplifier (EDFA) of fiber grating enhancing according to claim 1 is characterized in that, fiber reflector (7) or employing perhaps are an optical circulator at the terminal plating of Er-doped fiber (6) reflectance coating.
4, according to the L-band bilateral Erbium-Doped Fiber Amplifier (EDFA) of claim 1 or 3 described fiber gratings enhancings, it is characterized in that the length and the type of Er-doped fiber (6) are adjusted according to output power and gain requirements.
5, the L-band bilateral Erbium-Doped Fiber Amplifier (EDFA) that strengthens of fiber grating according to claim 1 is characterized in that, 980nm pump laser (5) or replaced by the 1480nm pump laser.
6, the L-band bilateral Erbium-Doped Fiber Amplifier (EDFA) that strengthens of fiber grating according to claim 1 is characterized in that, the preceding optical attenuator of tunable laser (1) is formed or formed by each loss welding optic fibre wire jumper by the coupling mechanism cascade of a plurality of splitting ratios.
7, the L-band bilateral Erbium-Doped Fiber Amplifier (EDFA) of fiber grating enhancing according to claim 1 is characterized in that, tunable laser (1) is fixing single wavelength or a tunable multi-wavelength laser instrument of wavelength.
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| CNB2003101083041A CN1279399C (en) | 2003-10-30 | 2003-10-30 | L wave band bipass optical fiber amplifier with erbium being adulterated enhanced by optical fiber grating |
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| CN1279399C CN1279399C (en) | 2006-10-11 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102073189A (en) * | 2010-12-30 | 2011-05-25 | 长春理工大学 | Two-cascade high-power optical fiber amplifier capable of protecting pump laser by optical circulator |
| WO2014101427A1 (en) * | 2012-12-28 | 2014-07-03 | 华为技术有限公司 | Multi-wavelength light source device |
| CN113410738A (en) * | 2021-06-17 | 2021-09-17 | 福州高意通讯有限公司 | Subminiature high-power C-band broadband spontaneous radiation amplification light source |
| CN114744480A (en) * | 2021-01-07 | 2022-07-12 | 中国石油天然气集团有限公司 | Light distribution type amplifying structure |
| CN116754104A (en) * | 2023-08-14 | 2023-09-15 | 山东省科学院激光研究所 | Fiber bragg grating laser thermal field sensor and application method thereof |
-
2003
- 2003-10-30 CN CNB2003101083041A patent/CN1279399C/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102073189A (en) * | 2010-12-30 | 2011-05-25 | 长春理工大学 | Two-cascade high-power optical fiber amplifier capable of protecting pump laser by optical circulator |
| WO2014101427A1 (en) * | 2012-12-28 | 2014-07-03 | 华为技术有限公司 | Multi-wavelength light source device |
| JP2015504612A (en) * | 2012-12-28 | 2015-02-12 | ▲ホア▼▲ウェイ▼技術有限公司 | Multi-wavelength light source device |
| CN114744480A (en) * | 2021-01-07 | 2022-07-12 | 中国石油天然气集团有限公司 | Light distribution type amplifying structure |
| CN114744480B (en) * | 2021-01-07 | 2024-05-28 | 中国石油天然气集团有限公司 | Light distribution type amplifying structure |
| CN113410738A (en) * | 2021-06-17 | 2021-09-17 | 福州高意通讯有限公司 | Subminiature high-power C-band broadband spontaneous radiation amplification light source |
| CN116754104A (en) * | 2023-08-14 | 2023-09-15 | 山东省科学院激光研究所 | Fiber bragg grating laser thermal field sensor and application method thereof |
| CN116754104B (en) * | 2023-08-14 | 2023-11-03 | 山东省科学院激光研究所 | Fiber bragg grating laser thermal field sensor and application method thereof |
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| CN1279399C (en) | 2006-10-11 |
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