Optical logic gate device on basis of coherent feedback and working method thereof

Abstract

The invention discloses an optical logic gate device on the basis of coherent feedback, which comprises a laser, polarization beam splitters, a medium unit, logic control gates, an optical fiber coupling frame and a multimode optical fiber. Pump light emitted by the laser enters a first polarization beam splitter and is reflected to the medium unit; after the pump light is subjected to four-wave mixing in the medium unit, an output light beam is generated and is emitted by a second polarization beam splitter to form a ring-shaped light spot and two bright spots in the vertical direction; two beams of feedback light are generated from the bright spots by a third polarization beam splitter; and the feedback light is controlled by a first logic control gate and a second logic control gate, enters the first polarization beam splitter by the optical fiber coupling frame and the multimode optical fiber and is crossed with the pump light in the medium unit. According to the invention, an optical logic OR gate and an optical logic NOR gate can be simultaneously implemented; and the optical logic gate device has the advantages of high ascending speed, consistent logic level, capability of controlling strong light by weak light and the like. The invention also discloses a working method of the optical logic gate device on the basis of coherent feedback.

Description

technical field [0001] The invention relates to the field of optical communication and optical computing, in particular to an optical logic gate device based on coherent feedback and a working method thereof. Background technique [0002] The principle of coherent feedback is to coherently interact an output signal with an input signal within an optical system. Compared with measurement-based feedback, coherent feedback has significant advantages in many applications, such as real-time control, preservation of coherent information and avoiding the introduction of additional measurement noise. The principle of coherent feedback has been used before to dynamically control, stabilize and enhance the performance of optical systems. For example, coherent feedback can be used for quantum error correction in the field of quantum information, and can be used to improve the compression degree of quantum squeezed light sources. In ultra-low energy optical bistability, coherent feedba...

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Problems solved by technology

[0003] The invention overcomes the defects in the prior art that the rising speed of the logic gate is slow, needs to use strong light to control the weak light, and the output logic level is difficult to keep consistent, and proposes an optical logic gate device based on coherent feedback and its working method

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