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报道了一种用于布里渊分布式光纤传感器(DOFS)的高稳定光学锁频系统。一台波长为1550nm的半导体分布反馈(DFB)激光器作为主激光器用于光纤传感探测,另一台同样的激光器作为从激光器,采用光学锁相的方法将其与主激光器进行频率跟踪,使主激光器与从激光器频率差恒定为11GHz。利用该光源搭建基于自发布里渊的分布式光纤传感系统(BOTDR),可以有效地实现宽带移频,使得探测解调频率降低到百兆赫兹量级,大大降低了探测的噪声,并且降低了BOTDR系统成本。结果表明,采用此光源方案的频率波动范围为±1MHz。
A highly stable optical frequency-locking system for Brillouin distributed optical fiber sensor (DOFS) is reported. A semiconductor distributed feedback (DFB) laser with a wavelength of 1550 nm is used as a master laser for optical fiber sensing and the other laser, the slave laser, is optically phase locked to the master laser to track the frequency of the master The difference between laser and slave laser frequency is constant at 11 GHz. Using this light source to build a self-published Brillouin-based distributed optical fiber sensing system (BOTDR), broadband frequency-shifting can be effectively implemented to reduce the detection and demodulation frequency to the hundred Hundred Hertz scale, greatly reducing the detection noise and reducing BOTDR system costs. The results show that using this light source program frequency fluctuation range ± 1MHz.