500 kHz高速扫频光源的研制

Development of 500 kHz High-Speed Swept Source

基于半导体光放大器和高速光纤法布里-珀罗滤波器,搭建了一个用于产生高速扫频激光的短环形腔。滤波器从长波到短波扫描时,关闭半导体光放大器的偏置电流,可以获得50%占空比的扫频激光。借助交织器,可以获得占空比为100%的扫频激光。再利用二级半导体光放大器,可以进一步提高扫频激光的输出功率。经测试,本扫频激光的扫描频率为500 kHz,中心波长为1550 nm,扫描范围达到67 nm,有效相干长度为6.5 mm,平均输出功率大于20 mW。

Based on a semiconductor optical amplifier(SOA)and a high-speed fiber Fabry-Perot filter,we built a short ring cavity for producing high-speed swept laser.During the filter sweeping from the long wavelength to the short wavelength,if the bias current of the SOA was switched off,we could acquire a swept laser with a duty cycle of 50%.With the help of an interleaver,the swept laser with a duty cycle of 100%could be obtained.Furthermore,after a second SOA was applied,the output power of the swept laser was further improved.Finally,it was experimentally demonstrated that the swept laser featured a swept frequency of 500 kHz,a center wavelength of 1550 nm,a sweep range of 67 nm,an effective coherence length of 6.5 mm,and an average output power of greater than 20 mW.