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分析了光纤光栅不理想特性的产生机理,对以啁啾光纤光栅为色散补偿器的10Gb/s光传输系统中,啁啾光纤光栅的不理想特性包括群时延纹波、反射纹波及光栅通带带宽对采用归零码(RZ)、非归零码(NRZ)以及载波抑制归零码(CSRZ)三种调制格式传输系统性能的影响进行了详细的数值分析和比较.同时进行了基于光纤光栅色散补偿的1500km无误码传输实验,通过对啁啾光纤光栅由于不理想特性的差别而导致对实际传输系统不同信道性能影响的比较,进一步验证了仿真分析的正确性.
The mechanism of the undesired characteristics of FBG is analyzed. For the 10Gb / s optical transmission system with chirped FBG as dispersion compensator, the undesirable characteristics of chirped FBG include group delay ripple, reflected ripple and grating pass Bandwidth The numerical analysis and comparison of the impact of transmission system performance using three kinds of modulation schemes, ie, zero return code (RZ), non-return to zero code (NRZ) and carrier suppression to zeroing code (CSRZ), are carried out in detail.At the same time, The experiment of 1500km error-free transmission of grating dispersion compensation is carried out. The comparison of different channel performance of the actual transmission system caused by the difference of the undesired characteristics of chirped fiber gratings further verifies the correctness of the simulation analysis.