针对现有光学相干层析成像(OCT)中所用扫频激光光源能量较低这一技术瓶颈, 研究了一种基于SOA级联的傅里叶域锁模(FDML)扫频光源, 利用中心波长为1310nm的半导体光放大器(SOA)搭建了双环形腔扫频光源。对系统中两只SOA的输出特性和基于SOA级联的双环扫频光源的光谱输出特性进行了研究。结果表明, 在SOA工作电流为280mA下, 该扫频光源光功率达28mW, 扫频速度达81.3kHz, 扫频范围超过90nm, 瞬时线宽小于0.03nm。

To overcome the technical bottleneck of low output optical power of swept laser source used in OCT (optical coherence tomography), a kind of Fourier domain mode-lock swept laser source was studied based on cascading SOA. A dual-ring swept laser source was built by using two semiconductor optical amplifiers(SOA) with the center wavelength of 1310nm. The output characteristics of the two SOA and the spectral output characteristics of dual ring swept laser were studied. The result shows that the optical power of the swept laser source is 28mW under the operating current of 280mA, the swept speed is up to 81.3kHz, the sweep range is beyond 90nm and the instantaneous linewidth is less than 0.03nm.