光源线宽和色散对DWDM通信系统光纤光栅滤波器的码率限制

Light Source Spectrum-induced and Dispersion-induced Bit-rate Limitation of Fiber Bragg Grating Filter in DWDM Communication Systems

分析了DWDM系统中光纤光栅滤波器透射色散特性 ,光源线宽和光栅透射色散对啁啾高斯光脉冲的展宽及对通信系统码率的限制 ,在适当的参量条件下 ,对系统码率进行了计算 ;结果表明 ,在接近单色时 ,啁啾是限制码率的主要因素 ,在线宽较大时 ,线宽成为限制码率的主要因素 ,光栅长度的增长 。

Transmission dispersion of fiber Bragg grating filter is analysed in high bit rate dense wavelenghth division multiplexed (DWDM) communication systems,for chirped ganssian optical pulses, the pulse broadening and bit rate limitation in DWDM systems resulted by FGB filter′s transmission dispersion and light source line width are also analyzed ,the bit rate limitation is calculated with given parameters.As a result,the chirp is the key factor in limiting the bit rate when light source is almost monochromic,line width becomes the key factor when line width is big,and the length of the FBG is proved to be a factor to bit rate limitation too.