An Optical Signal Encryption/Decryption System Based on Time Lens Imaging

Abstract

The invention discloses an optical signal encryption / decryption system based on time lens imaging. The system comprises time lens imaging sub-systems. Each time lens imaging sub-system is composed of an input section optical fiber, a time lens and an output section optical fiber. The second-order dispersion phi''<2> of the output section optical fiber is opposite to the second-order dispersion phi''<1> of the input section optical fiber, namely the''<2> is equal to -phi''<1>. The amplification factor of each time lens imaging sub-system is M=phi''<2> / phi''<1>=-1. In all 0 code periods of time of pump light sequence streams, time lens effects will not be generated and signal sequences in covered periods of time of pump light are kept unchanged. In all 1 code periods of time of the pump light sequence streams, the time lens effects are generated and the signal sequences in the covered periods of time of the pump light are inverted. According to the optical signal encryption / decryption system based on time lens imaging provided by the invention, optical signals can be encrypted and decrypted, and the security of the system is high.

Description

technical field [0001] The invention relates to an optical signal encryption / decryption system constructed by using time lens imaging technology. Background technique [0002] Time lens refers to an optical device that can generate a second time phase shift for optical signals. For signal processing in the field of optical communication, the first choice is to use four-wave mixing (FWM) to achieve the time lens effect. The magnitude of the electric field is E s (t) and E p (t) The signal light and the pump light have FWM interaction, and the electric field amplitude of the idle wave generated idle light E idler Relative to the input signal light E s In terms of introducing a quadratic phase shift, this is the basic principle of FWM to produce temporal lensing effect. [0003] From the input fiber (the second order dispersion is φ 1 "=β 2s L s ), time lens (the focal length dispersion is φ f ″=-φ p " / 2=-β 2p L p / 2), output fiber (the second order dispersion is φ...

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the shortcomings of the existing technology that cannot realize optical signal encryption and decryption, and cannot prevent optical information from being stolen and embezzled by criminals, the present invention provides a time-lens-based imaging system that can effectively realize optical signal encryption and decryption and has good security. Optical signal encryption / decryption system

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