Development of a frequency-tunable optical phase lock loop (OPLL) for high resolution fiber optic distributed sensing
Development of a frequency-tunable optical phase lock loop (OPLL) for high resolution fiber optic distributed sensing
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DOI：
10.1117/12.880306
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发表时间：
2011-03
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影响因子：
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通讯作者：
Vladimir Kuperschmidt;L. Stolpner;P. Mols;M. Alalusi;A. Mehnert;R. Barsan;F. Ansari
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文献类型：
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作者：
Vladimir Kuperschmidt;L. Stolpner;P. Mols;M. Alalusi;A. Mehnert;R. Barsan;F. Ansari
我们报告了适用于高性能光纤布里渊散射分布式传感的精密可调双波长光学光源的开发。该设计基于光学锁相环 (OPLL) 系统，采用新颖的窄线宽、低频噪声和高稳定性 PLANEX 外腔半导体。 PLANEX 激光器固有的波长稳定性（通常比市场上任何 DFB 激光器好一个数量级）使 OPLL 能够在较宽的环境温度范围内连续运行，而不会降低波长锁定性能。 OPLL 架构采用保偏 (PM) 组件实现，并且具有非常低的拍频抖动，约为几 kHz。 OPLL 频率调谐范围在 8 至 14 GHz 之间，扫描步长的快速调谐约为 100 µs。这种频率调谐范围几乎涵盖了所有基于自发或受激布里渊散射产生的频移测量的相应温度和应变传感应用，因此对于 BOTDA/BOTDR 分布式传感系统来说是一种通用且可行的技术。
We report on the development of a precision-tunable, dual wavelength, optical light source suitable for high performance fiber optic Brillouin scattering distributed sensing. The design is based on an Optical Phase Locked Loop (OPLL) system using novel narrow linewidth, low frequency noise and high stability PLANEX external cavity semiconductor. The inherent wavelength stability of PLANEX lasers (typically an order of magnitude better that any DFB laser on the market) enable the OPLL to operate continuously over a wide ambient temperature range without degradation in wavelength locking performance. The OPLL architecture is implemented with polarization maintaining (PM) components and has a very low beat frequency jitter on the order of few kHz. The OPLL frequency tuning range is between 8 and 14 GHz, with fast tuning of sweep steps on the order of 100 μsec. Such a frequency tuning range covers practically all corresponding temperature and strain sensing applications based on the measurement of the frequency shift produced by spontaneous or stimulated Brillouin scattering, and thus is a versatile and enabling technology for both BOTDA/BOTDR distributed sensing systems.