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频谱分割是使用窄带光滤波器选择宽带光源光谱的一个切片的WDM技术,在波分复用无源光网络(WDM-PON)中采用波分复用器((MUX)进行频谱分割,能够实现光网络单元(ONU)的无色化。模型分析表明由于频谱分割的作用,使得波分复用器光通带外的频谱成分被过滤,减小了宽带光源的色散影响。在20 nm CWDM标准信道间隔下,能够以不超过1 dB的光功率代价支持155 Mb/s信号在20 km的G.652常规光纤上传输;在0.8 nm DWDM信道间隔下则能够支持2.5 Gb/s信号传输,色散引起的光功率代价低于0.5 dB。采用中心波长为1550 nm、谱宽70 nm、输出功率为—10 dBm的LED,研制了125 Mb/s速率信号直接调制的无色ONU。在信道间隔为20 nm、光纤长度为20 km的4波长WDM-PON系统上进行测试,色散等因素引起的光功率代价小于1 dB,系统光功率余量则超过5.6 dB。
Spectrum slicing is a slicing WDM technique that uses a narrowband optical filter to select the spectrum of a broadband light source. Spectral division using a wavelength division multiplexer (MUX) in a wavelength division multiplexed passive optical network (WDM-PON) The optical network unit (ONU) is colorless. Model analysis shows that spectral components outside the optical passband of the wavelength division multiplexer are filtered due to spectral splitting, reducing the dispersion of the broadband light source. At 20 nm CWDM standard Channel spacing enables transmission of 155 Mb / s signals over 20 km of G.652 conventional fiber at optical power rates up to 1 dB; 2.5 Gb / s signal transmission at 0.8 nm DWDM channel spacing, dispersion The optical power cost is less than 0.5 dB.The colorless ONU directly modulated by the rate of 125 Mb / s is developed by using the LED with center wavelength of 1550 nm, spectral width of 70 nm and output power of -10 dBm.The channel spacing is 20 nm, and a fiber length of 20 km. The optical power cost caused by the dispersion is less than 1 dB, and the optical power margin of the system exceeds 5.6 dB.