A technique that has gained much interest for doubling the system capacity and spectral efficiency is the use of polarization-multiplexing (Pol-Mux) of two independent data streams.

• 使用偏振合并调制两个独立的光讯号流的技术，来达成双倍的光纤传输系统容量还有频谱利用率，最近得到学术研究上的关注。