All-optical XOR logic gate based on optical bistability of vertically coupled microring laser

Abstract

The invention discloses an all-optical exclusive or logical gate based on the optical bistable state of a vertical coupled microring laser. First and second nanowire waveguides are used for coupling input optical signals into a first microring resonant cavity by use of first and second directional couplers, respectively, and logical operation is performed in the first microring resonant cavity; the first microring resonant cavity is used for coupling the output optical signal obtained through the operation into the first nanowire waveguide by use of the first directional coupler; third and fourth nanowire waveguides are used for coupling the input optical signals into a second microring resonant cavity by use of third and fourth directional couplers, respectively, and corresponding logical operation is performed; the second microring resonant cavity is used for coupling the output optical signal obtained through the operation into the fourth nanowire waveguide by use of the fourth directional coupler; the output optical signals of the first and fourth nanowire waveguides are combined by use of a third Y-branch coupler, and finally, the operation result is output. The all-optical exclusive or logical gate based on the optical bistable state of the vertical coupled microring laser is high in performance and low in loss; the lateral dimension of the device is effectively reduced and high-density device integration can be realized.

Description

technical field [0001] The invention relates to the field of all-optical logic operation devices, in particular to an all-optical XOR logic gate based on the optical bistable state of a vertically coupled micro-ring laser. Background technique [0002] With the rapid development of global network speed, higher requirements are placed on the transmission capacity and information processing capability of optical communication. Due to the problems of large size, complex structure and high energy consumption in the traditional optical communication system, it is difficult to adapt to the rapid development of network speed and the requirements of green energy saving and environmental protection. Therefore, one of the fundamental methods to solve the above problems is to build optoelectronic integrated chips, directly Signals are processed and exchanged within the domain. [0003] As one of the most important logic functions in the optical information processing unit, the all-opt...

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This not only makes the cost of device preparation expensive, but also makes it difficult to control the process precision

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