Low noise and narrow linewidth external cavity semiconductor laser for coherent frequency and time domain reflectometry

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	Low noise and narrow linewidth external cavity semiconductor laser for coherent frequency and time domain reflectometry
其他题名	Low noise and narrow linewidth external cavity semiconductor laser for coherent frequency and time domain reflectometry
	SU, CHIN B.
	1996-04-23
专利权人	TEXAS A&M UNIVERSITY SYSTEM, THE
公开日期	1996-04-23
授权国家	美国
专利类型	授权发明
摘要	A semiconductor laser (10) having an external cavity used for coherent frequency and time domain reflectometry is provided. The laser (10) provides a very stable single longitudinal mode characteristic, a very narrow lasing linewidth, and a very low noise optical output. The laser (10) includes a semiconductor optical amplifier (14) emitting a coherent light beam from one facet, a phase modulator (22) receiving the coherent light beam and linearly varying an optical frequency of the laser, and an etalon (32) selecting and stabilizing one longitudinal mode of the laser cavity for lasing, narrowing the linewidth and reducing the noise. A computer-controlled and piezoelectric actuated wavelength-selective grating (58) varies the length of the laser cavity and thereby tuning the optical frequency of the selected longitudinal mode to track the transmission frequency of the etalon by maintaining maximum power intensity thereby stabilizing the selected mode. A selected portion of the coherent light beam is directed back to the semiconductor optical amplifier (14) and further amplified. A reference portion of the light beam is coherently mixed with a backscattered signal portion of the light beam to yield reflectometry measurement or detection.
其他摘要	提供了一种半导体激光器（10），其具有用于相干频率和时域反射计的外腔。激光器（10）提供非常稳定的单纵模特性，非常窄的激光线宽和非常低的噪声光输出。激光器（10）包括从一个面发射相干光束的半导体光放大器（14），接收相干光束并线性改变激光器的光频率的相位调制器（22），以及标准具（32）选择并稳定激光腔的一个纵向模式以产生激光，缩小线宽并降低噪声。计算机控制和压电驱动的波长选择光栅（58）改变激光腔的长度，从而通过保持最大功率强度来调节所选纵模的光频以跟踪标准具的传输频率，从而稳定所选模式。相干光束的选定部分被引导回半导体光放大器（14）并进一步放大。光束的参考部分与光束的反向散射信号部分相干地混合，以产生反射测量或测量。
申请日期	1995-03-22
专利号	US5511086
专利状态	失效
申请号	US08/408739
公开（公告）号	US5511086
IPC 分类号	H01S5/14 \| H01S5/00 \| H01S5/0687 \| H01S3/13
专利代理人	-
代理机构	BAKER & BOTTS
文献类型	专利
条目标识符	http://ir.opt.ac.cn/handle/181661/34563
专题	半导体激光器专利数据库
作者单位	TEXAS A&M UNIVERSITY SYSTEM, THE
推荐引用方式 GB/T 7714	SU, CHIN B.. Low noise and narrow linewidth external cavity semiconductor laser for coherent frequency and time domain reflectometry. US5511086[P]. 1996-04-23.

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