Polarization multiplexing channelization receiver based on optical comb

Abstract

The invention discloses a polarization multiplexing channelization receiver based on an optical comb. The polarization multiplexing channelization receiver comprises a flat optical comb generator, a light intensity modulator connected with the flat optical comb generator, an optical coupler connected with the light intensity modulator, an acoustic optical modulator connected with the optical coupler, a variable attenuator connected with the optical coupler, a first polarization controller connected with the variable attenuator, a second polarization controller connected with the acoustic optical modulator, a polarization beam combiner connected with the first polarization controller, an F-P standard tool connected with the polarization beam combiner, a third polarization controller connected with the F-P standard tool, a polarization beam splitter connected with the third polarization controller, a first wavelength division multiplexer and a second wavelength division multiplexer respectively connected with the polarization beam splitter, and a first photoelectric detector array and a second photoelectric detector array which are respectively connected with the first wavelength division multiplexer and the second wavelength division multiplexer. On the basis that the number of spectral components of the optical comb is not changed, the measurement range and the measurement precision are improved.

Description

technical field [0001] The invention belongs to the technical field of microwave photon signal processing, which is used for real-time measurement of the spectrum characteristics of wideband radio frequency signals, capable of generating high-precision frequency spectrum of radio frequency signals, and particularly relates to a polarization multiplexing channelized receiver based on an optical comb. Background technique [0002] In the modern military radar system, the real-time monitoring and measurement of the broadband radio frequency signal spectrum is an essential and important part. However, direct full-spectrum real-time monitoring has not been possible so far due to the limited real-time bandwidth of electronic devices. Therefore, the current common real-time monitoring of radio frequency spectrum is divided into two steps. First, channelize the wideband radio frequency signal, that is, divide the wideband frequency spectrum into multiple subbands, and then receive ...

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Problems solved by technology

[0005] However, the channelization receiver based on the optical comb currently has the problem of insufficient measurement range. The root of this problem is that the existing optical comb generation method is difficult to generate a large number of spectral components with flat power and equal frequency intervals

For example, the optical comb generation method using parametric mixing can only generate 10 spectral components, and its power fluctuation is large (about 7dB); the nonlinear optical comb generation method based on microdisk can generate about 100 spectral components, but its The power fluctuation is close to 10dB; the externally modulated optical comb generation method can generate an optical comb with extremely small power fluctuation, but the number of spectral components is limited and a large RF drive power is required

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