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扫频光源是光纤传感解调的关键部件,高质量的扫频光源可提高光纤传感系统的信噪比和解调精度。研制了一种基于傅里叶域模式锁定(FDML)的扫频光源。光源采用环形腔结构,由半导体光放大器(SOA)、光纤法布里-珀罗(FP)可调谐滤波器、隔离器、光纤耦合器和光纤延迟线组成。同时设计了基于FP腔的滤波器,对输出光谱进行平坦滤波。得到扫频范围为60 nm(1506~1566 nm),扫频速度为250 Hz,平坦度优于0.3 d B,线宽小于0.16 nm,平均输出光功率为4.53 m W的扫频光源。研制出的扫频光源结构简单、成本低廉、平坦度好,在光纤传感解调系统中作为光源有一定的实用价值。
Swept-frequency light source is a key component of fiber-optic sensing demodulation. High-quality swept-frequency light source can improve signal-to-noise ratio and demodulation accuracy of optical fiber sensing system. A scanning source based on Fourier domain mode locking (FDML) was developed. The light source uses a ring cavity structure consisting of a semiconductor optical amplifier (SOA), a fiber Fabry-Perot (FP) tunable filter, an isolator, a fiber coupler, and a fiber delay line. At the same time, a filter based on FP cavity is designed to flatten the output spectrum. A swept frequency light source with a swept frequency range of 60 nm (1506 ~ 1566 nm), a sweep speed of 250 Hz, a flatness better than 0.3 d B, a line width of less than 0.16 nm and an average output optical power of 4.53 mW was obtained. The swept frequency light source developed has the advantages of simple structure, low cost and good flatness, and has certain practical value as a light source in an optical fiber sensing demodulation system.