All-optical diode is one of the key devices of future optical communication and photonic computer.In this paper, the nonreciprocal optical transmission characteristics of a new-type all-optical diode based on nonlinear photonic crystal (PC) are analyzed by means of finite difference time domain, and two ultrashort pulse lasers are used to pump the PC directly-coupled microcavity and the side-coupled microcavity, respectively, so that the nonlinear optical bistable state of the two microcavities can be accurately adjusted and a high-performance optical diode, which is of a unidirectional transmission rate up to 90% and a forward-reverse transmission contrast ratio of more than 80, is realized in a broad operating bandwidth of more than 0.44nm (dozens of times that in the literature).%全光二极管是未来光通信和光计算中的关键器件之一.文中通过仿真实验,利用时域有限差分法研究了一种新型非线性光子晶体全光二极管的非互易光传输特性,提出通过利用两个超短脉冲泵浦对光子晶体直接耦合微腔与侧边耦合微腔分别进行泵浦,以对两个微腔的非线性光学双稳态进行精确调控,从而在较宽的工作带宽内(0.44nm,是已报道的数十倍)实现信号光的单向高透射率(可达90%),同时可获得较高的正反向传输对比度(超过80).
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