SCM/WDM系统中抑制载波的光学单边带调制技术

为了有效抑制SCM/WDM光纤通信系统中的群速度色散和非线性效应，利用SCM/WDM光纤通信系统中信号经过两次调制这一特性，提出了一种在SCM/WDM系统中容易实现的抑制载波的光学单边带调制技术。抑制载波的光学单边带调制信号具有很大的调制深度，即通过抑制载波可以有效的增大了调制深度，进而可以减小调制器的外加电压升高而激发的一系列有害的非线性效应。实测的调制信号的频谱只剩下了半个边频，有效地减小了光信号的频带宽度，从而可以有效地减小群速度色散对信号的劣化。接收机灵敏度的实测图表明，利用文中所述的抑制载波的光学单边带调制技术可以有效地提高接收机的灵敏度达3-5dB。

Carrier-suppressed optical single-side-band modulation on SCM/WDM systems

In order to suppress GVD and nonlinear interference on SCM/WDM optical fiber communication systems, a kind of facile carrier-suppressed optical single-side-band(SSB) modulation is used. The carrier-suppressed optical single-side-band modulation signals have a large modulation depth which can suppress nonlinear effect in optical fiber and eliminate intermodulation distortion which comes from nonlinear modulation characteristic of optoelectronic modulators simultaneously. It is clearly that the detected spectrum of the modulated signal only has one sideband which can effectively reduce the band width of the light signal and then significantly decrease dispersion penalty and increase the optical bandwidth efficiency. It can be seen form the measured receiver sensitivity map that using carrier-suppressed optical single-side-band modulation technique can effectively improve the receiver sensitivity of 3-5dB.