Apparatus for Optically Generating Microwave Phase-Encoded Signals

Abstract

The invention discloses a device for optically generating microwave phase encoding signals, which relates to the field of microwave technology and optical communication technology, and is mainly applied to the generation of pulse compression signals in pulse compression radars. Using the frequency-shifting characteristics of the dual-parallel Mach-Zehnder modulator, the optical wavelength modulated by the coded signal and the frequency-shifted optical wavelength are coupled and detected by a photodetector to generate a phase-coded microwave signal. The device can generate binary, quaternary or multi-ary phase-encoded microwave signals, and the generated phase-encoded microwave signal has a large frequency adjustable range and has a large time-width-bandwidth product, which overcomes the traditional electric field generation of phase-encoded microwaves. The signal mode is limited by the speed bottleneck and bandwidth of electronic devices, the cost of high-frequency signal generation is extremely high or cannot be generated, and the time-width-bandwidth product is limited, and the system has disadvantages such as poor reconfigurability and frequency adjustability.

Description

technical field [0001] The invention relates to the field of microwave technology and the field of optical communication technology, in particular to a device for optically generating microwave phase encoding signals. Background technique [0002] With the rapid development of radar technology, the requirements for radar operating range, resolution capability and measurement accuracy are getting higher and higher. The resolution theory of radar shows that: on the premise of ensuring a certain signal-to-noise ratio and achieving the best processing, the ranging accuracy and distance resolution mainly depend on the spectral structure of the signal, which requires the signal to have a large bandwidth; the speed measurement accuracy and speed resolution Depending on the temporal structure of the signal, it requires the signal to have a large duration. Therefore, in order to make the radar system have a long range and have high range and speed measurement accuracy and good dista...

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Problems solved by technology

The above methods can only generate binary phase encoding signals. In order to generate multi-ary phase encoding signals, an arbitrary waveform generation system based on photoelectric oscillators is proposed. This method can generate frequency-adjustable binary and quaternary phase encoding signals. , but the frequency adjustable range of this scheme is limited by the phase-shifted fiber Bragg grating used in the system, and since the system frequency tuning is realized by changing the wavelength of the optical signal, its long-term working stability is limited by the wavelength stability of the light source

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