Phase-coded signal generation system and method based on spatial light modulator and optical pulse interference

Abstract

The invention discloses a phase-coded signal generation system and method based on a spatial light modulator and optical pulse interference. The generation system comprises a mode-locked laser (1), anoptical dispersion device (2), an optical divider (3), an optical fiber delay line (4), the spatial light modulator (5), an optical multiplexer (6) and a high-speed photoelectric detector (7); the mode-locked laser (1), the optical dispersion device (2), and the optical divider (3) are connected in sequence; the optical divider (3) is separately connected with the input end of the optical fiber delay line (4) and the input end of the spatial light modulator (5); the output end of the optical fiber delay line (4) and the output end of the spatial light modulator (5) are separately connected with the optical multiplexer (6); and the optical multiplexer (6) is connected with the high-speed photoelectric detector (7). The system and method provided by the invention can generate a phase-codedsignal with tunable broadband, and has the advantages of relatively low system loss and relatively high signal to noise ratio of output signal.

Description

Technical field [0001] The invention belongs to the technical field of microwave signal generation, and in particular relates to a phase encoding signal generation system and method based on the interference of a spatial light modulator and optical pulses. Background technique [0002] In modern pulse compression radar systems, it is often necessary to simultaneously measure the distance and speed of the target. Generally speaking, the range resolution of a radar system is inversely proportional to the bandwidth of its transmitted signal, and the speed resolution is inversely proportional to the time width of the radar signal. Therefore, in a radar system with high range and speed resolution, it is necessary to transmit signals with a large time width and bandwidth at the same time. Thus, the product of time and bandwidth of the signal is defined as the time-bandwidth product to measure the performance of the radar signal. The phase-encoded signal, especially the two-phase enco...

AI Technical Summary

Problems solved by technology

However, since the baseband encoded signal is often generated using an electronic pseudo-random code generator, the bandwidth of the generated phase-encoded signal is still limited by the "electronic bottleneck"

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