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解释了超结构光纤光栅(SSFBG)作为脉冲成型滤波器的特性,说明SSFBG能够产生规则的时域矩形光脉冲,在频域上功率谱密度表现为sinc函数的形式.当光波道的频率间隔为码元速率的整数倍时,相邻波长的功率谱零点位于信号波长的中心频率处,频谱正交交叠.研究了一种基于SSFBG的正交波分复用(OWDM)系统,发送端用SSFBG进行脉冲整形,接收端采用窄带滤波器.给出基于理想窄带滤波器和高斯窄带滤波器两种接收机的串扰噪声模型,并得出了仿真结果.结果显示,两种窄带滤波器均可抑制严重的信道串扰,当接收机窄带滤波器通带足够窄时,接收机串扰比信道串扰降低约10 dB;理想窄带滤波器优于高斯窄带滤波器2~5 dB.
The characteristics of the SSFBG as a pulse shaping filter are explained, which shows that the SSFBG can generate regular time-domain rectangular light pulses with the power spectral density in the form of the sinc function in the frequency domain.When the frequency of the optical channel is When the symbol rate is an integral multiple of the symbol rate, the zero point of the power spectrum of the adjacent wavelength is located at the center frequency of the signal wavelength and the spectra overlap orthogonally. An Orthogonal Wavelength Division Multiplexing (OWDM) system based on SSFBG is studied, SSFBG is used for pulse shaping and the receiver is a narrowband filter.The crosstalk noise model based on the ideal narrowband filter and the Gaussian narrowband filter is given and the simulation results are given.The results show that both narrowband filters Suppresses severe channel crosstalk. When the receiver narrowband passband is sufficiently narrow, the receiver crosstalk is reduced by about 10 dB compared to the channel crosstalk. The ideal narrowband filter is superior to the Gaussian narrowband filter by 2 ~ 5 dB.