随着对通信带宽要求的提高，急需发展一种全光网络.其中一个重要的部分就是目前开关的替代品，它必须能够将光信号转换成电信号，然后再转换成光信号以便进一步传输。避免信号转换次数增加不仅能明显减少费用，而且能够以更高的速度无变形地传送更大数量的数据、声音和图像。从 As communications bandwidth requirements increase, there is an urgent need to develop an all-optical network, an important part of which is an alternative to current switches that must convert optical signals into electrical signals and then into optical signals for further transmission. Avoiding the increase in the number of signal transitions not only significantly reduces costs, but also enables greater amounts of data, sound and images to be transmitted without distortion at higher speeds. From