发明授权
- 专利标题: Method and system to reduce FWM penalty in NRZ WDM systems
- 专利标题(中): NRZ WDM系统减少FWM损失的方法和系统
-
申请号: US09401871申请日: 1999-09-23
-
公开(公告)号: US06606178B1公开(公告)日: 2003-08-12
- 发明人: June-Koo Rhee , Jason E. Hurley
- 申请人: June-Koo Rhee , Jason E. Hurley
- 主分类号: H04B1004
- IPC分类号: H04B1004
摘要:
A method and a system are disclosed for reducing four-wave mixing (FWM) penalties in an optical transmission network. The FWM penalties are reduced by simultaneously and periodically modulating the phase of the optical signals propagating through a long fiber waveguide at a modulation frequency that causes destructive interference of the FWM products that are otherwise generated along the length of the long fiber waveguide. The method may be implemented in an optical transmitter for an optical transmission network by providing a phase modulator between the multiplexer and an optical boost amplifier so as to simultaneously modulate the phase of all the optical signals that are transmitted through the long fiber waveguide. Alternatively, a phase modulator may be disposed between each source of modulated optical signals and the multiplexer so as to separately modulate the phase of all the optical signals that are subsequently transmitted through the long fiber waveguide.