Stabilization of laser sources with closely-coupled optical reflectors using an internal dither circuit

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	Stabilization of laser sources with closely-coupled optical reflectors using an internal dither circuit
其他题名	Stabilization of laser sources with closely-coupled optical reflectors using an internal dither circuit
	ZIARI, MEHRDAD; WAARTS, ROBERT G.; LANG, ROBERT J.; DEANDREA, JOHN; BORTZ, MICHAEL L.; VENTRUDO, BRIAN F.
	2001-04-10
专利权人	SDL, INC.
公开日期	2001-04-10
授权国家	美国
专利类型	授权发明
摘要	Apparatus for providing a laser source optically coupled to an optical waveguide, such as an optical fiber, having a reflective grating positioned from the output facet of the laser source a distance equal to or greater than the coherence length of the laser source providing a portion of reflective feedback into the laser source optical cavity to maintain wavelength operation of the laser source in spite of changes in the laser operating temperature or drive current based upon coherence collapse in the laser operation. In cases where the fiber grating is positioned in the fiber within the coherence length of the laser source, intermittent coherence collapse, as opposed to continuous coherence collapse, is unavoidable. In cases where such a laser source is a pumping source for a solid state gain medium, such as an optical amplifier or laser having an active gain element, e.g., an Er doped amplifier, undesirable perturbations in the laser source output are present which have a deleterious effect on the operation of the solid state gain medium. The effect of these undesirable perturbations are substantially removed by a small, continuous variation or dither in the driving current of the laser source having a rate of variation that exceeds the active gain element excited state lifetime thereby controlling the switching of the laser source operation between states of coherency and coherence collapse. As a result, the effects of laser source perturbations are avoided so as not to have an effect on the operation of the coupled solid state gain medium so that its gain stability is improved. Various embodiments of dither circuits are disclosed. In addition, polarization-maintaining behavior is induced in optical waveguides to further improve laser source stability.
其他摘要	用于提供光耦合到光波导（例如光纤）的激光源的装置，其具有从激光源的输出面定位的反射光栅，其距离等于或大于激光源的相干长度，提供一部分尽管激光器工作温度或驱动电流的变化基于激光器操作中的相干性坍塌，但反射反馈到激光源光学腔中以保持激光源的波长操作。在光纤光栅位于激光源的相干长度内的光纤中的情况下，与连续相干塌陷相反，间歇相干塌陷是不可避免的。在这种激光源是固态增益介质的泵浦源的情况下，例如光学放大器或具有有源增益元件的激光器，例如Er掺杂的放大器，存在激光源输出中的不希望的扰动，其具有有害对固态增益介质的操作有影响。通过激光源的驱动电流中的小的连续变化或抖动基本上消除了这些不期望的扰动的影响，其具有超过有源增益元件激发态寿命的变化率，从而控制激光源操作在状态之间的切换。一致性和连贯性崩溃。结果，避免了激光源扰动的影响，从而不会对耦合的固态增益介质的操作产生影响，从而提高其增益稳定性。公开了抖动电路的各种实施例。另外，在光波导中引起偏振保持行为以进一步改善激光源稳定性。
授权日期	2001-04-10
申请日期	1998-11-20
专利号	US6215809
专利状态	失效
申请号	US09/197062
公开（公告）号	US6215809
IPC 分类号	H01S3/094 \| H01S5/14 \| H01S5/00 \| H01S3/08
专利代理人	-
代理机构	GALLAGHER & LATHROP LATHROP, DAVID N.
文献类型	专利
条目标识符	http://ir.opt.ac.cn/handle/181661/41685
专题	半导体激光器专利数据库
作者单位	SDL, INC.
推荐引用方式 GB/T 7714	ZIARI, MEHRDAD,WAARTS, ROBERT G.,LANG, ROBERT J.,et al. Stabilization of laser sources with closely-coupled optical reflectors using an internal dither circuit. US6215809[P]. 2001-04-10.

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