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自注入锁定DFB半导体激光器用作φ-OTDR光源研究
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Abstract:
φ-OTDR分布式振动传感系统需使用窄线宽和频率漂移率小的相干光源，DFB半导体激光器的线宽通常在MHz量级且频率稳定性差，无法直接用作φ-OTDR系统的光源。本文使用光纤环形谐振器利用自注入锁定的方法来压窄DFB半导体激光器的线宽并稳定其频率，并且将其作为φ-OTDR分布式振动传感系统的光源。自注入锁定实现了约300倍的线宽压窄，振动传感实验显示该系统有时能测到振动信号有时不能，表明锁定过程中的跳模是自注入锁定激光器用于φ-OTDR振动传感系统时需要克服的困难。
A coherent light source with narrow
linewidth and small frequency drift rate is needed for an φ-OTDR distributed vibration sensing system. The linewidth of the DFB
semiconductor laser is usually in the order of MHz and its frequency stability
is poor, so it cannot be used directly as a light source for an φ-OTDR system. In this paper, a fiber
ring resonator is used to narrow the linewidth and stabilize the frequency of a
DFB semiconductor laser by using the self-injection locking method, and the
laser is used as the light source of an φ-OTDR
distributed vibration sensing system. The self-injection locking can achieve
about 300-time narrowing. The vibration sensing experiment shows that the system
can sometimes distinguish vibration signals and sometimes cannot. We
demonstrate that the mode hopping in the locking process is a difficulty to be
overcome when the self-injection locking laser is used in the φ-OTDR vibration sensing system.
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