Shen Xiling, Kahn Joseph M, Horowitz Mark A
Department of Electrical Engineering, Stanford University, California 94305, USA.
Opt Lett. 2005 Nov 15;30(22):2985-7. doi: 10.1364/ol.30.002985.
Adaptive optics is used to compensate for modal dispersion in digital transmission through multimode fiber (MMF). At the transmitter, a spatial light modulator (SLM) controls the launched field pattern. An estimate of intersymbol interference (ISI) caused by modal dispersion is formed at the receiver and fed back to the transmitter, where the SLM is adjusted to minimize ISI. Error-free transmission of 10 Gbit/s non-return-to-zero signals through standard 50 microm graded-index MMFs up to 11.1 km long is demonstrated. It is shown that a single SLM can compensate for modal dispersion across a 600 GHz bandwidth.
自适应光学用于补偿通过多模光纤（MMF）进行数字传输时的模式色散。在发射端，空间光调制器（SLM）控制发射的场模式。在接收端形成由模式色散引起的符号间干扰（ISI）估计，并反馈到发射端，在那里调整SLM以最小化ISI。展示了通过长达11.1公里的标准50微米渐变折射率多模光纤实现10 Gbit/s非归零信号的无差错传输。结果表明，单个SLM可以补偿600 GHz带宽内的模式色散。
