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提出一种基于啁啾光纤布拉格光栅(CFBG)的宽谱光单边带(OSSB)调制实现方法。光双边带(ODSB)调制信号经过同一CFBG两个相反方向的反射,利用偏振控制器(PC)实现两个方向偏振态的正交。这种双反射CFBG(DR-CFBG)结构可以滤出光载波与其中一个边带实现OSSB调制,同时消除了反射谱内的色散,避免了滤波引起的相位畸变。利用实验制作的线性CFBG搭建了DR-CFBG,实验数据仿真结果表明,本文方法可以实现宽谱基带信号与加载数据信息射频信号的OSSB调制,结果表明传输距离大于6km时,40Gb/s NRZ信号OSSB调制传输有明显优势;加载2.5Gb/s的NRZ信号,OSSB调制传输50km,误码率为10-9时,20GHz射频为载波的功率代价比10GHz低3dB,比40GHz低1.2dB。改进CFBG的边沿斜率可以更好地抑制边带残留,提高OSSB调制信号的传输性能。
A wideband single sideband (OSSB) modulation scheme based on chirped fiber Bragg grating (CFBG) is proposed. The optical double-sideband (ODSB) modulated signal is reflected by two opposite directions of the same CFBG, and the polarization state of the two directions is orthogonalized by a polarization controller (PC). The double reflex CFBG (DR-CFBG) structure can filter out the optical carrier and one of the sidebands for OSSB modulation, and meanwhile eliminate the dispersion in the reflection spectrum and avoid the phase distortion caused by filtering. The experimental results show that this method can achieve the OSSB modulation of the wideband baseband signal and the loaded data RF signal. The results show that when the transmission distance is more than 6km, the 40Gb / s NRZ signal OSSB Modulation transmission has obvious advantages; loading 2.5Gb / s NRZ signal, OSSB modulation transmission 50km, bit error rate of 10-9, 20GHz RF carrier power for the cost of 3dB lower than 10GHz, lower than 40GHz 1.2dB. Improving the edge slope of the CFBG can better suppress the sideband residue and improve the transmission performance of the OSSB modulated signal.