Method for generating frequency modulation signal based on light injection locking

Abstract

The invention discloses a method for generating a frequency modulation signal based on light injection locking. A first laser, a second laser, a first microwave source, a second microwave source, a microwave amplifier, a first coupler, a second coupler, a first polarization controller, a second polarization controller, an isolator, an intensity modulator, a circulator, an acousto-optic frequency shifter and a photoelectric detector are included. The temperature and current parameters of a first laser are adjusted to modulate the first laser, wherein one path modulates an optical signal into asideband through an intensity modulator, and then injects and locks the modulated sideband of the optical signal into a second laser without an isolator, so that the phase of the second laser is locked to a high-order sideband of the first laser; the other path outputs a signal of which the frequency can be linearly changed through an acousto-optic frequency shifter; and then, the two paths of light are coupled by the second coupler, the output end of the second coupler and the photoelectric detector beat frequency to generate a frequency modulation signal with tunable high-frequency broadband, and the frequency modulation signal has the advantages of continuous phase and high stability.

Description

technical field [0001] The invention relates to a system for generating frequency modulation signals based on optical injection locking Background technique [0002] The Linear Frequency Modulation (LFM) signal is a pulse compression signal commonly used in radar systems. It can increase the radio frequency pulse width, increase the average transmission power, and increase the communication distance while maintaining sufficient signal spectrum width to ensure the radar. Resolution, so it has been widely used in the field of radar and sonar detection. Pulse compression radar sends LFM signal with wider pulse width when working, and performs pulse compression on it when receiving, so as to extract the distance information of the target; therefore, how to generate high-quality LFM signal is very important for pulse compression radar. With the development of radar, more and more researchers began to seek the method of generating LFM signal with low complexity and high spectral ...

AI Technical Summary

Problems solved by technology

[0007] Aiming at the prior art, the present invention provides a method for generating a frequency modulation signal based on optical injection locking, which solves the problems of poor stability, phase discontinuity, and non-tunability of the existing injection locking technology, and the system structure of the present invention is simple and easy to implement , can be used as a stable signal generator to generate broadband tunable linear frequency modulation signals

Images