Device for increasing signal-to-noise ratio of dense wave division multiplex multiple wavelength light source

The present invention belongs to great capacity fiber communication technology. The device includes ultrashort pulse light source providing ultrashort light pulse signal; fiber amplifier amplifying light pulse signal; fiber expanding the spectrum of the light pulse signal; filter filtering the expanded spectrum to obtain multi-wavelength light source with channel interval coinciding with the communication standard; fiber amplifier amplifying the multi-wavelength light signal; non-linear fiber environment filtering the multi-wavelength light simultaneously to eliminate in-line noise; and waveguide grating array demultiplexing multi-wavelength light signal to obtain single wavelength light signals. The present invention can raise S/N ratio effectively, has no need of outer sync signal and small insertion loss. 本发明涉及一种提高密集波分复用多波长光源信噪比的装置，属于大容量光纤通信领域。该装置包括：用于提供超短光脉冲信号的超短脉冲光源；用于对光脉冲信号进行放大的光纤放大器；用于对光脉冲信号的光谱进行展宽的光纤；用于对展宽光谱进行滤波的滤波器，以得到信道间隔符合通信标准的多波长光源；用于对多波长光源进行放大的光纤放大器；用于对多波长光源进行同时滤波的非线性光纤环镜，以滤除信号中的同频噪声；用于对多波长光源进行解复用的阵列波导光栅，以得到单一波长的各路光信号。本装置降低了滤波器无法滤除的同频噪声，有效地提高了信道的信噪比，操作简便，无须外部同步控制信号，而且还具有插入损耗小的优点。