共查询到18条相似文献,搜索用时 109 毫秒
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目前光纤通信系统所用的激光器都是固定波长激光器,这种激光器一旦制作好,波长便难以改变。而在密集波分复用(DWDM)系统中需要若干不同波长的激光二极管(LD)作光源,这样便需要制作若干个不同波长的固定波长激光器,不仅工艺制作困难,而且成本也增加。如能制作出在较宽波长范围内其波长可以任意调节的LD,便可采用同一结构制作出满足一系列波长要求的光源。目前,可调波长激光器已成为激光二极管研发的热点。按其波长可调激光器的工作原理可分为机械、电和热调谐,若按其结构可分为外腔型半导体激光器、电调谐半导体激光器和热调谐半导体激光器。 相似文献
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可调谐激光器是DWDM系统及未来全光网络中的关键器件,提升了易升级、可重构光网络的智能性和动态性。全面详细地介绍了各种通信用可调谐激光器的类型、结构、特点及调谐原理,描述了多家著名公司推出的可调谐激光器的性能参数,总结了可调谐激光器的研究进展和发展趋势。 相似文献
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光通信用可调谐激光器技术研究发展 总被引:5,自引:0,他引:5
可调谐激光器是DWDM系统及未来全光网络中的关键器件,提升了易升级、可重构光网络的智能性和动态性.全面详细地介绍了各种通信用可调谐激光器的类型、结构、特点及调谐原理,描述了多家著名公司推出的可调谐激光器的性能参数,总结了可调谐激光器的研究进展和发展趋势. 相似文献
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可调谐激光器是DWDM系统及未来全光网络中的关键器件,提升了易升级、可重构光网络的智能性和动态性,在未来光通信领域具有重要的应用价值。在这种背景下,本文首先概述了可调协半导体激光器,进而提出了光通信系统可调谐半导体激光器的电路设计思路。 相似文献
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对于大容量的波分复用(WDM)光通信系统,精确控制波长及波长间隔是系统应用的关键.而对于信道间隔为 0.8 nm的 WDM系统,要求波长与 ITU的标准价差小于±0.01 nm.因此,波长可精确调谐的单模激光器成为必需.本文介绍了我们制作的两种波长可调谐的单模激光器:可调谐DFB激光器和可调谐DBR激光器.其中,可调谐DFB激光器采用的是热调谐方式,即改变DFB激光器的工作温度,实现了波长向长波方向连续移动 2.2 nm;可调谐 DBR激光器采用的是注入电流的方式,实现了 6.5 nm的准连续调谐. 可调… 相似文献
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Halbritter H. Riemenschneider F. Kogel B. Feldmeier E. Meissner P. 《Electronics letters》2004,40(24):1536-1538
A novel idea and realisation of a control algorithm to switch the wavelength of continuously tunable lasers is presented. The concept allows the switching of a defined number of dense wavelength division multiplexed (DWDM) channels up or down by employing a broadband wavelength locker. The switching algorithm is implemented and demonstrated for a micro-electro-mechanically tunable vertical-cavity surface emitting laser (MEM-VCSEL). 相似文献
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O'Dowd Ronan Duill Sean O' O'Gorman Neal Mulvihill Gavin 《Photonic Network Communications》2001,3(4):377-381
As WDM channel spacing continues to decrease in size, and with the application of tunable lasers in DWDM (dense wavelength division multiplexing) systems, we demonstrate the ability of electronically tuned lasers to cope with demanding channel spacing and inevitable low frequency setting error. By finding the stable operating points of a single tunable laser at the desired frequencies, using advanced software for feature extraction a look-up table to drive the laser was generated. Once the drive currents to access 2000 channels in a 2 GHz comb are found, and in order to justify their usability in WDM networks, their frequency setting error and Side Mode Suppression Ratio (SMSR) was found. These results open up new possibilities for DWDM access networks while pointing to new potential for management of versatile wavelength re-allocation as well as providing a limit of achievement for channel density and granularity in the optical fiber network. 相似文献
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随着光通信技术的快速发展,光纤传输的容量呈几何式增长,对密集波分复用(DWDM)网络系统的管理和调度灵活性要求也在不断提高。波长可调模块可以满足网络管理灵活的要求,在波分复用(WDM)系统和5G网络中将会有广泛应用。而作为模块内的核心元件,可调激光器的研究就显得尤为重要。文章介绍了一种可调激光器和硅光调制器芯片混合集成封装技术,利用一种胶合标准具的设计进行波长控制,节省了半导体制冷器,减小了封装尺寸。其制作的可调激光器件能满足ITU-96通道的波长输出,且满足100 G BASE-LR4国际标准的工作眼图要求。 相似文献
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A discretely tunable, single-frequency erbium-doped fiber ring laser demonstrates frequency locking to the 50-GHz ITU frequency grid with an accuracy of /spl plusmn/0.3 GHz and stability of /spl plusmn/0.05 GHz over a 50-nm tuning range. An output power of 7 mW and an extinction ratio of 45 dB make this single-frequency laser useful for a variety of DWDM applications. 相似文献
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为了寻求高质量和高密度的密集波分复用器件,采用了在双掺铟铁的铌酸锂晶体中透射式记录/正交式读出方案制作体全息光栅的方法,对体全息光栅衍射特性进行理论分析和实验验证.利用波长为532nm的激光记录尺寸比为1:1的体全息光栅,然后用中心波长为1550nm的红外通讯波长成功读出,取得了波长选择性为0.5nm的波长衍射特性数据.同时,利用2维耦合波理论的闭形式解析解得到了该体全息光栅衍射效率随波长的变化关系.结果表明,实验结果与理论预期相符合,这一方法对制作体全息光栅密集波分复用器件的实用化是有帮助的. 相似文献
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Dai H. Janz S. Normandin R. Nielsen J. Chatenoud F. Williams R. 《Photonics Technology Letters, IEEE》1992,4(8):820-823
An In0.22Ga0.78As/GaAs single quantum-well (SQW) laser integrated monolithically with a surface-emitting harmonic generator (SEHG) segment was fabricated and tested. By coupling a 1.06-μm Nd:YAG laser output into the active device, the green surface-emitting light at 0.51 μm was observed as the result of nonlinear interactions within the SEHG segment. The nonlinear interaction cross section A nl of the device was found to be 2.3×10-7 W-1, which agrees well with theory. The application of the active devices as a dense wavelength-division-multiplexing (DWDM) demultiplexer was demonstrated with a tunable Ti:sapphire laser to simulate the multiwavelength signal source and a CCD detector array to record the spatially separated signals of different wavelength. System resolution better than 2 nm was obtained for the device, which was limited by the short length of the SEHG segment. Potential for a DWDM channel spacing of 10 GHz is discussed 相似文献