码型调制技术在光纤通信系统中的应用

Application of Modulation Format in Optical Fiber Communication Systems

近年来,互联网业务的飞速增长对骨干网及接入网的传输容量和速率提出了越来越高的要求,尤其是语音和视频业务的发展,大大刺激了光纤通信技术的发展。新型调制格式DPSK、DQPSK等由于具有较高的频谱利用率和抗噪声能力,而逐渐成为商用电信网络中的主要调制格式;D8PSK调制格式由于具有更高的比特/符号率,也受到了越来越多的关注。论文介绍了光信号调制/解调的基本原理及在调制/解调光信号的过程中发挥重大作用的Mach-Zehnder调制器,并重点介绍OOK、DPSK、DQPSK、D8PSK信号的调制/解调原理及性能。

In recent years, put forward higher requirements on the rapid growth of Intemet business backbone network and access network transmission capacity and rate, especially the development of voice and video business, greatly stimulated the development of optical communication technology. New modulation formats such as DPSK, DQPSK as the rate and anti noise ability of using spectrum has high, and gradually become the main modulation format commercial telecommunications network; D8PSK modulation format because of its higher bit/symbol rate, has also attracted more and more attention. The paper introduces the basic principles of optical signal modulation/ demodulation and play an important role in the modulation/demodulation process of optical signals in the Mach-Zehnder modulator, and introduced OOK, DPSK, DQPSK, D8PSK signal modulation/demodulation principle and performance.