Optical Frequency Hopping System and Transmitter Based on Optical Circulator

Abstract

The invention discloses an optical frequency hopping system based on an optical circulator and a transmitter. The optical frequency hopping system includes: an annular modulation unit, whereinthe annular modulation unit comprises a plurality of optical circulators; the first port of each optical circulator receives different optical carriers; a second port of each optical circulator is connected with an optical coupler, each optical coupler is connected with a phase modulator and is combined with frequency hopping coding in a pseudo-random code generator to realize coding modulation of an optical carrier signal, and a third port of each optical circulator respectively outputs the coded and modulated optical carrier signal; a transmitter which is internally provided with the annular modulation unit and is used for transmitting the optical carrier signal encrypted by the annular modulation unit; a receiver which is used for receiving the encrypted optical carrier signal and decrypting the encrypted optical carrier signal through frequency hopping coding; and an optical fiber which is used for realizing carrier communication between the transmitter and the receiver. According to the invention, high-speed optical frequency hopping coding can be realized, a flexible and simple unit structure is provided, expansion to a multi-channel optical frequency hopping system is facilitated, and a communication system with higher confidentiality is provided.

Description

technical field [0001] The invention relates to the field of optical communication security, in particular to an optical frequency hopping system based on an optical circulator. Background technique [0002] In today's information age, too much commercial confidential information and personal privacy information are transmitted through optical fiber networks every day. In the past, people always thought that optical fiber communication was very safe, but with the development of technology, optical fiber eavesdropping can be realized through optical fiber bending, beam splitting, evanescent wave coupling, scattering and other methods. Therefore, safe optical communication becomes a very important subject. [0003] At present, the improvement of communication security is mainly divided into software layer and hardware layer. The software layer includes algorithm encryption for user data, such as AES encryption, but all algorithm-based encryption methods have been proven to be...

AI Technical Summary

Problems solved by technology

For hardware-based encryption methods, such as optical code division multiplexing technology, chaotic encryption technology, etc., since the encrypted signals of these two encryption methods are analog signals, the transmission distance during transmission in the optical fiber network will be limited.

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