光交换是指光纤传送的信息直接进行交换。与电子数字程控交换相比,光交换无需在光纤传输线路和交换机之间设置光端机进行光电、电光变换,并且在交换过程中还能充分发挥光信号的高速、宽带和无电磁感应的优点。主要有4种交换方式:空分光交换、时分光交换、波分光交换、复合型光交换。 Optical switching refers to the optical transmission of information directly exchanged. Compared with electronic digital program-controlled switching, optical switching does not need to set the optical transceiver between optical fiber transmission line and switch for photoelectricity and electro-optic conversion, and can also give full play to the advantages of high speed, broadband and electromagnetic induction of optical signal in the exchange process. There are four main exchange modes: air separation and optical switching, time and optical switching, optical switching, composite optical switching.