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为满足光纤故障高精度诊断需求,研制了一种面向混沌光时域反射仪(COTDR)的混沌光源模块,该模块由宽带混沌信号源与激光器调制电路构成。其中,宽带混沌信号源可产生频谱平坦且10dB带宽达500MHz的混沌电信号,该信号经调制电路放大后,驱动分布反馈式(DFB)半导体激光器可输出大功率、宽频带的混沌激光信号。所研制的混沌光源模块应用于光纤故障诊断中,不仅可实现光纤断点、不匹配连接点的检测,而且在107km测量范围内,可实现与距离无关的0.35m空间分辨率。此外,设计的混沌光源模块还可便捷地应用于混沌雷达、混沌保密通信等领域。
In order to meet the needs of high-precision optical fiber fault diagnosis, a chaotic light source module for chaotic optical time domain reflectometer (COTDR) is developed. The module consists of a broadband chaotic signal source and a laser modulation circuit. Among them, the chaotic signal source of broadband can produce the chaotic signal with flat frequency spectrum and the frequency of 10dB up to 500MHz. After amplified by the modulation circuit, the drive distributed feedback (DFB) semiconductor laser can output chaotic laser signals with high power and wide band. The developed chaos light source module is applied in optical fiber fault diagnosis, which can not only detect fiber breakpoint and mismatch connection point, but also realize the spatial resolution of 0.35m independent of the distance in the 107km measuring range. In addition, the designed chaotic light source module can also be conveniently applied to the fields of chaotic radar, chaotic secure communication and the like.