共查询到19条相似文献,搜索用时 156 毫秒
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基于悬臂梁啁啾调谐的光纤光栅滤波器 总被引:1,自引:1,他引:0
提出并发展了一种基于悬臂梁结构的啁啾光纤Bragg光栅(CFBG)啁啾调谐方案,获得了一系列性能优异的可调谐CFBG滤波器,包括调谐范围达到36 nm(1.8~37.8 nm)的带宽可变反射滤波器、色散在178~2 100ps/nm范围内可调的色散补偿器、基于取样CFBG或重叠写入CFBG的信道间隔可调谐滤波器等。这些FBG滤波器不但能维持较高的反射率,还能保持中心波长基本不变。 相似文献
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改变啁啾光栅轴向温度场的梯度,可使得该非周期光栅轴向上不同位置的反射波长发生相应的变化,从而改变光栅的啁啾量,达到调节色散的目的.文章通过在可调色散补偿器中封装两个分别具有正、负色散的光纤布拉格光栅(FBG),实现了色散调节范围达到-900-700 ps/nm的可调色散补偿(TODC)技术.这种方式具有无机械调节运动装... 相似文献
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用于10Gb/s WDM系统色散补偿的波长取样啁啾光纤光栅 总被引:6,自引:2,他引:4
研制出一种新型色散补偿光纤光栅--波长取样啁啾光纤光栅,它具有10个周期性为0.8nm的波长结构,每个周期的反射特性和色散特性都基本相同,其带宽为0.6nm、峰值反射率为90%、色散量为1300ps/nm、时延抖动小于50ps,光栅长度为10cm.利用此波长取样啁啾光纤光栅,在8×10Gb/s波分复用(WDM)系统中,进行了NRZ码140km标准单模光纤的色散补偿实验,补偿效果良好. 相似文献
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主动锁模光纤环形激光器的悬臂梁调谐法 总被引:1,自引:1,他引:0
利用悬臂梁来对光纤光栅的Bragg波长进行调谐,并将可调谐光纤光栅用于主动锁模光纤环形激光器中,获得了5.24nm的波长调谐范围。同时,在1547.883nm处,获得了脉宽为55ps,谱宽为0.017nm锁模脉冲输出。 相似文献
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基于SOA啁啾管理的连续可调谐色度色散补偿的研究 总被引:1,自引:0,他引:1
提出了一种新型的可小范围连续调谐的色度色散(CD)补偿方案.该CD补偿方案包括一个半导体光放大器(SOA)和一段固定长度的色散补偿光纤(DCF).利用SOA的交叉相位调制(XPM)效应,通过调节SOA的偏置电流和控制脉冲光的强度,可以对进入SOA的光信号引入不同大小的附加啁啾量,从而可以利用固定长度的DCF得到补偿后的无啁啾光信号.实验中,实现了10 Gb/s可调谐CD补偿器,在无需替换DCF的情况下,实现了补偿范围为-40 ps/nm到60 ps/nm的连续可调谐CD补偿. 相似文献
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色散补偿型光栅是非周期光栅,采用改变光栅轴向温度场梯度,可使得光栅轴向上不同位置的反射波长发生不同的变化,从而改变啁啾量,达到调节色散的目的.基于这一理论设计了一种基于光纤布喇格光栅的可调色散补偿器,具有无机械调节运动装置,模块可靠性高,色散的调节范围可达到为800ps/nm. 相似文献
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B. Dabarsyah C.S. Goh S.K. Khijwania S.Y. Set K. Katoh K. Kikuchi 《Photonics Technology Letters, IEEE》2003,15(3):416-418
We demonstrate a dispersion compensation device based on thermal chirping of a glued fiber Bragg grating. The device can change the group velocity dispersion (GVD) while maintaining a center wavelength or change the center wavelength while preserving a GVD value. The GVD can be tuned from -122.5 to -57 ps/nm with a center wavelength at 1552.9 nm. On the other hand, the center wavelength can be shifted by 2.2 nm with a GVD value around -105 ps/nm. 相似文献
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Lunardi L.M. Moss D.J. Chandrasekhar S. Buhl L.L. Lamont M. McLaughlin S. Randall G. Colbourne P. Kiran S. Hulse C.A. 《Lightwave Technology, Journal of》2002,20(12):2136-2144
We present a multichannel tunable dispersion compensator (TDC) based on multicavity all-pass etalons that is capable of operation at 40 Gb/s. The device has a tuning range of +200/-220 ps/nm with a group delay ripple < /spl plusmn/5 ps over a channel bandwidth of 80 GHz, an overall loss of < 5.2 dB, very low insertion loss ripple, and can operate on any channel on a 200-GHz grid over the C-band. In addition, we present system performance results at 40 Gb/s using NRZ, RZ, and CS-RZ modulation, compensating up to 45 km of nonzero dispersion shifted fiber (NZDSF). Our results show that this device introduces very little excess system penalty with signal frequency drifts of up to 20 GHz when operated near the center of its tuning range. For single channel experiments with fiber, the system penalty increase versus signal detuning is more significant, but can be reduced by dynamically optimizing the device dispersion during detuning. Finally, we demonstrate simultaneous compensation of 4 channels across the C-band over 25 km of NZDSF. 相似文献
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Electrically tunable dispersion compensator with fixed center wavelength using fiber Bragg grating 总被引:1,自引:0,他引:1
Ngo N.Q. Li S.Y. Zheng R.T. Tjin S.C. Shum P. 《Lightwave Technology, Journal of》2003,21(6):1568-1575
We present the design and development of a novel tunable dispersion compensator with fixed center wavelength that is based on the electrical adjustment of the chirp of a fiber Bragg grating (FBG). Both temperature gradient and strain gradient are employed to adjust the chirp of the FBG jointly. The electrical current flowing through the taper on-fiber thin-film heater will introduce a temperature gradient on the FBG. The shrinkage of a negative thermal expansion coefficient (NTEC) ceramic due to the temperature rise will compress the tapered FBG mounted inside it, and this will introduce a strain gradient on the FBG. The center wavelength of the FBG will be kept fixed because the effect of temperature rise on the FBG and the effect of compression of the FBG will offset each other. Applying an electrical power of less than 0.68 W, we demonstrate a linearly chirped FBG whose dispersion can be continuously adjusted from -178 ps/nm to -302 ps/nm with a central wavelength shift of as small as 0.16 nm. 相似文献
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The transmission of ultrashort optical pulses over long distances in optical fibers is limited by pulse broadening due to group velocity dispersion. A grating and telescope dispersion compensator with group velocity dispersion of equal magnitude and opposite sign can compensate for the fiber dispersion. The possible benefits of such dispersion compensation in the 1.3-1.6-μm wavelength region are investigated. The results show that compensation of first-order dispersion at 1.55 μm in a fiber with zero dispersion near 1.3 μm is primarily limited by the second-order dispersion of the grating and the telescope compensator. For a wavelength slightly greater than the zero dispersion wavelength, both the first- and second-order group velocity dispersion can be canceled by the grating and telescope dispersion compensator, allowing transmission exceeding 100 Gb/s over 100 km 相似文献
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D. Gauden E. Goyat A. Mugnier P. Lesueur P. Yvernault D. Pureur 《Photonics Technology Letters, IEEE》2003,15(10):1387-1388
A tunable four-channel dispersion compensator is achieved using fiber Bragg grating technology and applying a temperature gradient along the grating. Any dispersion from -370 to -1420 ps/nm could be obtained. 相似文献
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CHEN Ming YIN Fei-fei HE Li-na ZHANG Ye-jin YANG Si-gang CHEN Hong-wei XIE Shi-zhong 《光电子快报》2007,3(5):359-362
A remnant dispersion monitoring method based on spectral-shift of SOA in high speed optical communication system with CSRZ format and single channel speed of 40 Gbit/s is proposed. The system performance can be optimized by careful choosing bandwidth and center wavelength of the optical fiber grating filter. The dynamical monitoring range is ±60 ps/nm and the monitoring precision is about 5 ps/nm. This method can be suitable for the application in dynamical dispersion compensation of high speed optical communication systems. 相似文献
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K. Thyagarajan C. Kakkar 《Photonics Technology Letters, IEEE》2003,15(12):1701-1703
We report here a novel fiber design which has inherently flattened effective Raman gain spectrum, with a relative 3-dB bandwidth of /spl sim/90 nm. Gain-flattened broad-band amplification can be achieved in any wavelength band by suitably choosing the fiber parameters and the pump wavelength. Simulations show that the proposed fiber also has high negative dispersion coefficient /spl sim/(-300 to -600) ps/km /spl middot/ nm in the operating range of wavelength. Hence, the designed fiber serves the purpose of a gain-flattened broad-band amplifier and dispersion compensator. 相似文献
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Goh C.S. Set S.Y. Taira K. Khijwania S.K. Kikuchi K. 《Photonics Technology Letters, IEEE》2002,14(5):663-665
In this letter, we demonstrate an adjustable dispersion slope compensator for waveform distortion compensation based on a nonlinearly strain-chirped fiber Bragg grating. The dispersion slope of the device can be tuned up to -18.9 ps/nm2 with a bandwidth >2.4 nm. After transmission through a 120-km-long dispersion-shifted fiber, the resulting waveform distortion for a 2.65-ps pulse is successfully compensated by using this device 相似文献
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Tunable dispersion compensator based on a fiber Bragg grating written in a tapered fiber 总被引:1,自引:0,他引:1
J. Mora A. Diez M.V. Andres P.-Y. Fonjallaz M. Popov 《Photonics Technology Letters, IEEE》2004,16(12):2631-2633
We report a novel dispersion tunable device for first-order dispersion compensation. It is based on a fiber Bragg grating written in a tapered fiber with a specific profile. The taper profile allows tuning the dispersion of the grating by stretching the fiber while the linearity of the group delay is preserved. A device with 0.8 nm of useful bandwidth and dispersion value tunable over more than 400 ps/nm is reported. 相似文献