Self-phase modulation effect based transient signal light modulus conversion system

Abstract

A self-phase modulation effect based transient signal light modulus conversion system comprises a laser. An output end of the laser is connected with an input end of a first circulator through an adjustable attenuator. A first output end of the first circulator is connected with a first faraday rotating mirror through a first dispersive medium, and a second output end thereof is connected with an input end of a double-arm single-end-output electric light modulator through a polarization controller. Microwave signals are divided into two channels to be connected with the double-arm single-end-output electric light modulator through a hybrid coupler. An output end of the double-arm single-end-output electric light modulator is connected with an input end of a second circulator, a first output end of the second circulator is connected with the second faraday rotating mirror through a second dispersive medium, and a second output end of the second circulator is sequentially connected with an electric modulus converter through an optical fiber amplifier and a photoelectric detector. The self-phase modulation effect based transient signal light modulus conversion system can reduce length and loss of the dispersive media and cost.

Description

technical field [0001] The invention relates to the technical field of optical analog-to-digital conversion, in particular to a transient signal optical analog-to-digital conversion system based on self-phase modulation effect. Background technique [0002] With the continuous improvement of digital signal processing capabilities, the requirements for the performance of analog-to-digital converters are getting higher and higher. Today, there is an increasing demand for high-sampling rate, high-resolution, and high-bandwidth analog-to-digital converters, which are mainly used in advanced Important fields such as experimental instruments, military systems, biomedical imaging systems, radar systems and communication systems. The experimental group of Professor Jalali of UCLA first proposed the method of using time stretching to increase the sampling rate of the analog-to-digital conversion system in 1999. Compared with the traditional electrical analog-to-digital conversion sys...

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Problems solved by technology

[0009] This method of stretching the optical pulse only by dispersion requires a large amount of dispersion in the high-speed transient signal optical analog-to-digital conversion system. For a dispersion medium with a certain dispersion coefficient, a long fiber length is often required. The transmission loss in the long dispersion medium is large, and the system signal-to-noise ratio and effective bits are not very high

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