设计实验实现了基于级联调制器抽运源的1.7 μm波段宽带光源。采用连续光源和级联调制器组合的方式,在反常色散区域抽运1 km的高非线性色散位移光纤,产生了超连续谱。经过光纤波分复用器的滤波后,得到了峰值波长为1748.9 nm、输出功率约为22 dBm、20 dB光谱范围为1.6 ~2 μm、相应的谱宽约为419 nm的宽带光源。通过增加Sagnac滤波器,得到了频率周期为2.5 nm、强度周期为9.5 dB的多波长宽带光源。此外,分析了抽运功率、波长及重复频率对超连续谱展宽的影响。

We designed and experimentally implemented a broadband light-source at 1.7 μm based on a cascaded-modulator pumping source. We generated supercontinuum by pumping a 1 km highly nonlinear dispersion-shifted fiber in the anomalous dispersion region by using a continuous light source combined with a cascaded-modulator. After filtering by using an optical fiber wavelength-division multiplexer, we obtained a broadband light source with a peak wavelength of 1748.9 nm, an output power of approximately 22 dBm, a 20 dB spectral range of 1.6-2 μm, and a corresponding spectral width of approximately 419 nm. By adding the Sagnac filter, a multi-wavelength broadband light source with a frequency period of 2.5 nm and an intensity period of 9.5 dB was obtained. In addition, we analyzed the effects of pump power, wavelength, and repetition rate on supercontinuum broadening.