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 dB，线宽小于0.16 nm，平均输出光功率为4.53 mW 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 light source is a key component of fiber optic sensing demodulation. High-quality of the swept light source can improve the signal- to- noise ratio and demodulation precision of fiber sensing system. A Fourier domain mode locking (FDML) operating mode of the swept light source is reported. Semiconductor optical amplifier (SOA), fiber-optic tunable FP filter, isolator, fiber coupler and optical delay line form the swept source ring cavity. While a filter based on Febry- Perot (FP) cavity is designed to flat the output spectrum. The swept range is 1506~1566 nm, swept speed is 250 Hz, flatness is better than 0.3 dB, full width at half maximum (FWHM) is less than 0.16 nm, the average optical output power is 4.53 mW. The swept source has the advantages of simple structure, low cost and good flatness. As the light source of optical fiber sensor demodulation system, swept source has some practical value.