CN1195244C - Multi-band rare-earth doped optical fibre amplifier - Google Patents
Multi-band rare-earth doped optical fibre amplifier Download PDFInfo
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- CN1195244C CN1195244C CNB021365121A CN02136512A CN1195244C CN 1195244 C CN1195244 C CN 1195244C CN B021365121 A CNB021365121 A CN B021365121A CN 02136512 A CN02136512 A CN 02136512A CN 1195244 C CN1195244 C CN 1195244C
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Abstract
The present invention relates to a multiwave band rare-earth doped optical fibre amplifier which comprises three signal transmitting and amplifying arms, a pair of wave band multiplexers/demultiplexers, three rare-earth ion doped optical fiber amplifiers, a gain flattening wave filter and a pair of input output isolator, wherein the three amplifying arms respectively transmit and amplify 1280 to 1400NM and 1400 to 1530NM of short wavelength signals and C wave band and L wave band signals with the wavelength range of 1530 to 1620NM; the pair of wave band demultiplexers demultiplex input optical signals with the wavelength range of 1280 to 1620NM into the three wave bands which are coupled into output optical fibres via the wave band multiplexers after respectively amplified by the rare-earth ion doped optical fibre amplifiers. The present invention respectively adopts an erbium doped optical fibre amplifier, a thulium doped optical fibre amplifier and a praseodymium doped optical fibre amplifier so that the whole emission range of the optical fibres covers all the low-loss windows of full wave optical fibres, and the bandwidth can reach 340NM.
Description
Technical field:
The present invention relates to a kind of multi-band rare-earth doped optical fibre amplifier, be applicable to optical fiber telecommunications system and network.
Background technology:
In recent years, dense wave division multipurpose (DWDM) technology is owing to its remarkable advantage is subjected to experts and scholars' great attention, and it can effectively utilize bandwidth of an optical fiber and realize high capacity, long-distance optical fiber communication, can increase number of services in user allocation system.In these DWDM The Application of Technology,, need the bigger bandwidth and the cascade of a plurality of amplifiers for realizing the transmission of multi-wavelength and extra long distance.Compare with semiconductor optical amplifier, the increasingly mature rare-earth doped optical fibre amplifier of technology has that gain is high, bandwidth is wide, noise is low, gain characteristic is insensitive to the light polarization state, to data speed and form is transparent and in multiloop loop system the channel cross-talk advantage such as can ignore and be subjected to domestic and international experts and scholars' attention.At present, the domestic and international rare-earth doped optical fibre amplifier of studying concentrates on the Erbium-Doped Fiber Amplifier (EDFA) (EDFA) mostly.Yang Dandan (the CN1233868A of Canada AFC company, high efficient band width doubles and gain flattened silica fibre amplifier) and (US6049417, the Wideband Optical Amplifier) such as Atol Kumar Srtvas-tava of Lucent the broadband Erbium-Doped Fiber Amplifier (EDFA) is successively studied.The former proposes to adopt quartz optical fiber and two wave bands (C-band and L-band) to divide band structure can realize the smooth amplification of 80nm bandwidth (1530nm-1610nm), the latter proposes to adopt quartz optical fiber and triband (S-band: 1510-1525nm, M-band: 1525-1565nm and L-band: 1565-1610nm) divide band structure can realize the smooth amplification of 100nm bandwidth, these methods have been brought into play positive role for the potential bandwidth aspect of abundant excavation Er-doped fiber.In addition, at present, use the multi wavelength pumping structure, the smooth bandwidth of Raman Fiber Amplifier can reach 120nm.
Along with the day by day demand of user to bandwidth, optical fiber communication develops towards the direction of two-forty high bandwidth, and the silica fibre at anhydrous peak is succeeded in developing (as the AllWave optical fiber of LUCENT), will put it into commercial operation soon.The low-loss bandwidth of the silica fibre at anhydrous peak is 400nm (1250-1650nm), covered second, third, the 4th and the 5th communication window.Yet the maximally-flat bandwidth of the fiber amplifier of invention has only 120nm at present, and its bandwidth is less than all-wave fiber can utilize 1/3rd of bandwidth.Therefore, the wideer super-broadband fiber amplifier of research bandwidth becomes the research theme of recent close wavelength-division multiplex technology.
Summary of the invention:
The objective of the invention is at the deficiencies in the prior art, a kind of multi-band rare-earth doped optical fibre amplifier is proposed, with Er-doped fiber, thulium doped fiber with mix praseodymium optical fiber and be used in combination, have wideer bandwidth, the low loss window of all-wave fiber can be fully used.
In order to realize such purpose, the multi-band rare-earth doped optical fibre amplifier of the present invention's design comprises three signal transmission and amplifies arm, a pair of wavestrip multiplexing demultiplexing device, three rare earth ion doped optical fiber amplifiers, gain flattening filter and a pair of input and output isolators.Three signals transmission and amplifying in the arm, one is amplified the ultrashort wavelength signals that arm is used to transmit and amplify the 1280-1400nm wavelength coverage, second short wavelength's signal that is used to transmit and amplify the 1400-1530nm wavelength coverage, the 3rd C-band and L-band signal that is used to transmit and amplify the 1530-1620nm wavelength coverage.The input optical signal demultiplexing that the wavestrip demodulation multiplexer is used for the 1280-1620nm wavelength coverage is above-mentioned three wavestrips, after three rare earth ion doped optical fiber amplifiers amplify, is coupled into output optical fibre through the wavestrip multiplexer more respectively.Amplifier out is provided with a gain flattening filter, is used for smooth from the gain spectral of wavestrip multiplexer output and the noise outside the filtering 1280-1620nm wavelength coverage.
Three rare earth ion doped optical fiber amplifiers that the present invention adopts are respectively Erbium-Doped Fiber Amplifier (EDFA), thulium doped fiber amplifier and PDFA Praseodymium Doped Fiber Amplifier, because Er-doped fiber, thulium doped fiber and the emission spectrum of mixing praseodymium optical fiber cover 1450-1650nm respectively, 1350-1550nm and 1250-1450nm wavelength coverage, its whole transmitting boundary has covered all low loss window of all-wave fiber.The present invention is used in combination above three kinds of rare-earth doped optical fibres, designs the multi-band rare-earth doped optical fibre amplifier of 340nm bandwidth.Amplifier of the present invention can be fully used the low loss window of all-wave fiber.
Description of drawings:
Fig. 1 is the structural representation of multiband light fiber amplifier of the present invention.
Among Fig. 1, ISO is an isolator, and WBMU is the wavestrip multiplexer, and WBDMU is the wavestrip demodulation multiplexer, and EDFA is an Erbium-Doped Fiber Amplifier (EDFA), and TDFA is a thulium doped fiber amplifier, and PDFA is a PDFA Praseodymium Doped Fiber Amplifier, and GFF is a gain flattening filter.
Fig. 2 is the pumping configuration synoptic diagram of Fig. 1 middle rare earth ion doping fiber amplifier.
Among Fig. 2, REDF is rare earth ion (erbium ion, a thulium ion or praseodymium ion) doped fiber; WDM is pumping and signal coupler; LD is a semiconductor laser.
Fig. 3 is Er-doped fiber, thulium doped fiber and the combination of the emission spectrum of mixing praseodymium optical fiber.
Fig. 4 is the gain spectral after the wavestrip multiplexer is multiplexing.
Fig. 5 is the gain spectral of multiband light fiber amplifier output terminal through gain flattening filter.
Embodiment:
Below in conjunction with drawings and Examples technical scheme of the present invention is further described.
In the present embodiment, the structure of multi-band rare-earth doped optical fibre amplifier as shown in Figure 1, comprise three signal transmission and amplify arm, a pair of wavestrip multiplexing demultiplexing device (WBMU/WBDMU), three rare earth ion doped optical fiber amplifiers, gain flattening filter (GFF) and a pair of input and output isolators (ISO).Three transmission and amplify arm and use er doped silica glasses optical fiber respectively, mix the thulium glass optical fiber, mix the praseodymium glass optical fiber and make gain media, and use the semiconductor laser two directional pump.Three rare earth ion doped optical fiber amplifiers are respectively Erbium-Doped Fiber Amplifier (EDFA) (EDFA), thulium doped fiber amplifier (TDFA) and PDFA Praseodymium Doped Fiber Amplifier (PDFA), three signals transmission and amplifying in the arm, one is amplified the ultrashort wavelength signals that arm is used to transmit and amplify the 1280-1400nm wavelength coverage, second short wavelength's signal that is used to transmit and amplify the 1400-1530nm wavelength coverage, the 3rd C-band and L-band signal that is used to transmit and amplify the 1530-1620nm wavelength coverage.Wavestrip demodulation multiplexer (WBDMU) is above-mentioned three wavestrips with the input optical signal demultiplexing of 1280-1620nm wavelength coverage, after three rare earth ion doped optical fiber amplifiers amplify, is coupled into output optical fibre through wavestrip multiplexer (WBMU) more respectively.Amplifier out is provided with a gain flattening filter (GFF), is used for smooth from the gain spectral of wavestrip multiplexer output and the noise outside the filtering 1280-1620nm wavelength coverage.Whole amplifier input and output two ends are provided with an isolator (ISO) respectively.
Three rare earth ion doped optical fiber amplifiers that the present invention adopts have identical pumping configuration, as shown in Figure 2.For Erbium-Doped Fiber Amplifier (EDFA), use 20 meters long erbium-doped tellurate glass optical fiber as the gain media in the 1530-1620nm wavelength coverage, adopt two 1480nm semiconductor laser two directional pumps; For thulium doped fiber amplifier, use 10 meters long thulium-doped tellurate glass optical fiber as the gain media in the 1420-1530nm wavelength coverage, adopting wavelength is semiconductor laser and the 1405nm semiconductor laser two directional pump of 1100nm.For PDFA Praseodymium Doped Fiber Amplifier, use and mix praseodymium chalcogenide glass optical fiber as the gain media in the 1280-1420nm wavelength coverage, adopt two semiconductor laser two directional pumps that wavelength is 1060nm.Erbium-doped tellurate glass optical fiber (EDF), thulium-doped tellurate glass optical fiber (TDF) and mix praseodymium chalcogenide glass optical fiber (PDF) emission spectrum as shown in Figure 3.
The input channel number is 35, and the channel wavelength scope is from 1280 to 1620nm, and channel separation is 10nm, and the power input of every channel is-20dBm.It is 1.0dB that wavestrip multiplexing demultiplexing device (WBMU/WBDMU) inserts loss, and the insertion loss of gain flattening filter (GFF) is 0.5dB, and input and output isolator (ISO) inserts loss and is respectively 0.5dB.
Theory (IEEE Journal of Quantum electronics according to Michael J.Digonnet, Vol.26, No.10, Octomber, 1990, P1788-1796, " closed-form expression for the gain in the threeand four-level laser fibers ") in three-level and the mathematical model of four-level, obtain through numerical evaluation: work as EDF, when the pump power of TDF and PDF is 400mW, output gain after process wavestrip multiplexer (WBMU) is multiplexing is composed as shown in Figure 4, through the gain spectral after the gain flattening filter (GFF) as shown in Figure 5.
As seen from the figure, its smooth bandwidth is 340nm (1280-1620nm), and gaining is 22dB, and flatness is in 2dB, and amplifier of the present invention is used for the all-wave fiber communication system, can utilize 85% of all-wave fiber effective bandwidth (1250nm-1650nm).
Claims (2)
1, a kind of multi-band rare-earth doped optical fibre amplifier, it is characterized in that comprising three signal transmission and amplify arm, a pair of wavestrip multiplexing demultiplexing device, three rare earth ion doped optical fiber amplifiers, gain flattening filter and a pair of input and output isolator, three signals transmission and amplify arm and transmit respectively and amplify 1280-1400nm, short wavelength's signal of 1400-1530nm and the C-band of 1530-1620nm wavelength coverage and L-band signal, the wavestrip demodulation multiplexer is above-mentioned three wavestrips with the input optical signal demultiplexing of 1280-1620nm wavelength coverage, respectively after three rare earth ion doped optical fiber amplifiers amplify, be coupled into output optical fibre through the wavestrip multiplexer again, amplifier out is provided with a gain flattening filter, the input and output two ends are provided with an isolator respectively, wherein said three rare earth ion doped optical fiber amplifiers are respectively Erbium-Doped Fiber Amplifier (EDFA), thulium doped fiber amplifier and PDFA Praseodymium Doped Fiber Amplifier, PDFA Praseodymium Doped Fiber Amplifier amplifies the signal of 1280-1420nm wavelength coverage, thulium doped fiber amplifier amplifies the signal of 1420-1530nm wavelength coverage, and Erbium-Doped Fiber Amplifier (EDFA) amplifies the signal of 1530-1620nm wavelength coverage.
2, as the said multi-band rare-earth doped optical fibre amplifier of claim 1, it is characterized in that the transmission of three signals and amplify arm and use er doped silica glasses optical fiber respectively, mix the thulium glass optical fiber, mix the praseodymium glass optical fiber and make gain media, and use the semiconductor laser two directional pump.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB021365121A CN1195244C (en) | 2002-08-15 | 2002-08-15 | Multi-band rare-earth doped optical fibre amplifier |
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| CNB021365121A CN1195244C (en) | 2002-08-15 | 2002-08-15 | Multi-band rare-earth doped optical fibre amplifier |
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| CN1195244C true CN1195244C (en) | 2005-03-30 |
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| CNB021365121A Expired - Fee Related CN1195244C (en) | 2002-08-15 | 2002-08-15 | Multi-band rare-earth doped optical fibre amplifier |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103682961A (en) * | 2013-11-12 | 2014-03-26 | 上海交通大学 | Ultra-wideband optical-fibre source system and optical-fibre source implementation method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1295900C (en) * | 2003-10-23 | 2007-01-17 | 武汉光迅科技股份有限公司 | Mixed type dynamic light gain equilibrium method used in WDM system |
| CN102674688B (en) * | 2012-05-25 | 2014-04-09 | 中国科学院上海光学精密机械研究所 | Praseodymium-doped borophosphate base near-infrared ultra wide band luminescent glass and preparation method thereof |
| CN103682960A (en) * | 2013-11-12 | 2014-03-26 | 上海交通大学 | Ultra-wideband light source |
| CN107728403B (en) * | 2017-10-25 | 2023-07-14 | 中国地质大学（武汉） | Wavelength converter with wavelength ranging from 1.55 mu m to 2 mu m |
| CN114180835B (en) * | 2021-11-08 | 2023-06-30 | 宁波大学 | Rare earth doped glass with ultra-wideband near infrared fluorescence emission and preparation method and application thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103682961A (en) * | 2013-11-12 | 2014-03-26 | 上海交通大学 | Ultra-wideband optical-fibre source system and optical-fibre source implementation method |
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