共查询到20条相似文献,搜索用时 31 毫秒
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探索了新型Er2Tm共掺石英基质超荧光光纤光源的特性,在粒子数方程和功率传输方程的基础上对其放大自发辐射(ASE)特性进行了理论分析。在单向泵浦中,分析了泵浦功率和信号功率随光纤长度的变化特性,描述了在不同光纤长度、离子浓度及泵浦功率下信号谱的变化趋势;在双向泵浦中,讨论了泵浦功率和信号功率随光纤长度的变化特性以及信号谱相对于光纤长度和泵浦功率的稳定性。结果显示,利用Er2Tm共掺石英基质光纤可以获得稳定的100nm放大自发辐射带宽,大约是传统掺铒光纤超荧光光源带宽的两倍,但输出功率比后者低3个量级以上。 相似文献
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全光纤型Er/Yb共掺光纤短腔激光器 总被引:9,自引:4,他引:5
报道了一种高输出功率、高斜率效率的短腔ErYb共掺杂光纤激光器。激光谐振腔由一段ErYb共掺杂单模光纤与一对布拉格反射波长相同的光纤布拉格光栅(FBG)组成。反射率为60%的光纤光栅用作光纤激光器谐振腔的输出,3dB带宽为016nm。反射率为99%的光纤光栅作为高宽带反射腔镜,同时作为抽运光输入端,3dB带宽102nm。以980nm激光二极管(LD)作抽运源进行实验。使用不同的抽运功率分别测量不同长度的ErYb共掺杂光纤,优化光纤激光器谐振腔得到的最佳长度仅为13cm。即选用13cmErYb共掺杂光纤作为增益介质来制作短腔ErYb光纤光栅激光器,最大输出功率可达11mW,输出功率稳定性<±001dB,抽运阈值功率为35mW,斜率效率为153%,测量其15522nm激光的输出光谱,25dB线宽为03nm,边模抑制比>60dB,波长稳定性为005nm。可用于密集波分复用(DWDM)系统。 相似文献
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H.S. Seo W.J. Chung J.T. Ahn 《Photonics Technology Letters, IEEE》2005,17(9):1830-1832
We report a novel hybrid optical amplifier covering S+C+L bands with 105-nm total bandwidth using a silica fiber. The principle of amplification is based on the stimulated radiative transition of Er-ions for C-band and on the stimulated Raman scattering for S- and L-band, respectively. In this letter, we analyze the amplification characteristics for two types of active fiber mediums through numerical simulation. One is a silica fiber configured with Er-doped cladding and Ge-doped core and the other is a medium consisting of Er-doped fiber and dispersion-compensating fiber. By optimizing parameters such as fiber length and pump power, we newly achieve wide-band amplification with 105-nm bandwidth showing a flat gain characteristic over the entire S+C+L bands. 相似文献
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H.S. Seo Y.G. Choi B.J. Park D.H. Cho K.H. Kim 《Photonics Technology Letters, IEEE》2003,15(9):1198-1200
A flat signal gain over in the entire C- and L-bands by erbium (Er) ions' radiative transition and stimulated Raman scattering in an Er-doped germano-silica fiber can be obtained if proper values of the concentration of Er and background loss in a fiber core are obtained during the fiber fabrication process. The optimized conditions for the flat C- and L-band gain are analyzed as functions of Er concentrations. Even for a low-gain value provided by a germano-silica core fiber with a low Er concentration and an optimum fiber length, a relatively low pump is required to obtain the flat gain band. 相似文献
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ZHUO Zhong-chang SU Xue-mei YU Yong-sen ZHENG Wei ZHANG Yu-shu 《半导体光子学与技术》2005,11(3):145-149
The method to pump the FBGT written into an Er^3+-doped optical fiber is proposed to increase the group velocity of a probing pulse based on the facts that pump-induced process changes the refractive index and dispersion associated with the ^4I15/2-^4I12/2 transition in Er^3+-doped optical fiber.The system equations are derived.The effects of pump power and doping concentration on the group velocity are discussed. 相似文献
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M.R.X. de Barros G. Nykolak D.J. DiGiovanni A. Bruce W.H. Grodkiewicz P.C. Becker 《Photonics Technology Letters, IEEE》1996,8(6):761-763
We report the gain, noise figure, output saturation power, and conversion efficiency of a highly concentrated Er/sup 3+/-doped alumino silicate fiber amplifier. We obtain a gain per unit length of 1.0 dB/cm, which corresponds to the highest gain per unit length obtained in an Er/sup 3+/-doped fiber amplifier. The pump power threshold ranges from 2 to 5 mW, depending on the fiber length. 相似文献
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本文主要研究DBR掺饵光纤激光器的功率特性。通过对光纤Bragg光栅的光谱特性和激光器的传播方程的分析,得到了阈值泵浦光功率、掺饵光纤长度、Bragg光栅反射率与激光器输出光功率之间的关系。与近期报道的实验数据进行了比较,结果十分吻合。 相似文献
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分布拉曼光纤放大的实验研究 总被引:1,自引:1,他引:1
采用符合ITU-T标准的G波段40信道波分复用(WDM)光源对分布式拉曼放大器(DRA)的特性进行了实验研究。对不同抽运方式及不同光纤长度的分布式拉曼放大器性能作了较为详细的报道。在抽运功率相同的条件下,选用50km单模光纤对比研究了不同抽运方式的拉曼放大器增益和噪声。通过对不同光纤长度的分布式拉曼放大器的实验研究发现,在较低抽运功率且输入信号功率较低的情况下,随着光纤长度增加,拉曼增益也增加,有效噪声系数减小。研究了分布式拉曼放大器对波分复用通信系统信噪比的改善,实验发现不同抽运功率下,拉曼放大器对系统信噪比的改善随抽运功率增加而增加,但是不成线性关系,而且最终会出现饱和。 相似文献
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光纤激光器弛豫振荡特性研究 总被引:3,自引:0,他引:3
根据光纤激光器瞬态的速率方程,对F-P腔光纤激光器的瞬态输出特性进行了理论分析.采用数值计算方法对不同长度、不同腔面反射率、不同抽运功率下光纤激光器输出的弛豫振荡特性进行了模拟分析.结果表明弛豫振荡频率随光纤长度增加而减小,但是随抽运功率的变化很小.弛豫振荡幅度随抽运功率上升而增加,振荡的衰减时间随激光器腔镜的反射率的增加而上升,但是不随抽运功率变化.进行了975 nm抽运的Er/Yb共掺双包层光纤激光器的实验,实验表明理论分析得到的基本特性是合理的. 相似文献
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Horiguchi M. Yoshino K. Shimizu M. Yamada M. Hanafusa H. 《Lightwave Technology, Journal of》1994,12(5):810-820
State-of-the-art erbium (Er)-doped optical fiber amplifiers (EDFA's) pumped in the 660- and 820-nm bands are described. We have demonstrated highly efficient EDFA's incorporating optimized 664- and 827-nm pump wavelengths and an Er-doped high numerical aperture (NA) fiber with thermally diffused expanded core (TEC) fiber ends. Gain coefficients of 3.8 and 1.3 dB/mW at respective wavelengths of 664 and 827 nm were achieved at a signal wavelength of 1535 nm. Noise figures of 3.1 and 4.1 dB at respective pump wavelengths of 670 and 827 nm were obtained at a signal wavelength of 1535 nm. A highly efficient Er-doped fiber amplifier module, in which an AlGaInP visible laser diode (LD) was used as the pump source, was successfully developed as a practical application of this technology. A maximum overall gain coefficient of 3.0 dB/mW was achieved at a signal wavelength of 1535 nm. The EDFA module realized a maximum overall signal gain of 33 dB at 1535 nm with a saturated output power of -1 dBm. A maximum saturated output power of 3.9 dBm was obtained at a signal wavelength of 1552 nm. The present EDFA design using a low-cost laser diode for optical disk memory use and a high NA Er-doped fiber has great potential for providing inexpensive, high-performance EDFA's 相似文献
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Li Jin Dong Ma Yiqun Ding Chun Jiang 《Photonics Technology Letters, IEEE》2006,18(3):460-462
The rate and power propagation equations of Er/sup 3+/ and Tm/sup 3+/-codoped tellurite fiber amplifier pumped by 800-nm laser are presented and solved to analyze the dependences of gain at both 1470 and 1530 nm on the codoping concentration of Er/sup 3+/ and Tm/sup 3+/, fiber length, and input signal power. The numerical results show that with pump power of 200 mW and fiber length of 1.5 m, the gain at both 1470 and 1530 nm may reach 12.0 dB when the codoping concentration of Er/sup 3+/ and Tm/sup 3+/ reach 4.0/spl times/10/sup 25/ ions/m/sup 3/, 3.2/spl times/10/sup 25/ ions/m/sup 3/, respectively. The fiber length and codopant concentrations are proposed to make the two channels equivalently amplified. 相似文献
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Efficient and scalable side pumping scheme for short high-power optical fiber lasers and amplifiers 总被引:4,自引:0,他引:4
P. Polynkin V. Temyanko M. Mansuripur N. Peyghambarian 《Photonics Technology Letters, IEEE》2004,16(9):2024-2026
A new and simple method of pumping short high-power optical fiber lasers and amplifiers is described. In our approach, several passive coreless optical fibers are brought into direct contact alongside a single rare-earth doped active fiber which constitutes the active medium of the laser (amplifier). Pump light is delivered through the passive coreless fibers and penetrates into the active fiber via evanescent field coupling. To enhance the pump absorption in the gain medium, high-order spatial modes are excited in the pump delivery fibers, and an active fiber with high concentration of the dopant ions is used. As a demonstration of the viability of our approach, test results are reported on a 12-cm-long Er/sup +3/-Yb/sup +3/ codoped phosphate glass fiber laser. The laser output reaches 5 W using 23-W pumping into six coreless fibers. Above threshold, the laser has /spl sim/24% optical-to-optical conversion efficiency (with /spl sim/64% being the theoretical maximum). The linearity of the input-output characteristic for the laser suggests that the output power can be scaled up by applying higher pump power. 相似文献