Device and method of microwave photon channelized receiver of zero intermediate frequency

Abstract

The invention discloses a device and method of a microwave photon channelized receiver of zero intermediate frequency. As shown in the drawings, the device comprises a laser diode (LD), two local oscillator signals (LO1, LO2), a DP-QPSK modulator, an optical band-pass filter (OBPF), a single polarization modulator (MZM), a splitter, a narrowband OBPF group, a polarization controller (PC), a polarization beam splitter (PBS), a balance detector (BPD) and a multi-channel ADC. The DP-QPSK modulator generates polarization multiplexing signals of an optical frequency comb and positive and negative second-order sidebands, a radio frequency (RF) signal modulates the positive and negative second-order sidebands, a generated lower sideband is within a spectral line of the optical frequency comb, and the narrowband OBPF group performs balance detection after channel division and performs demodulation to obtain IQ data. DC bias and even distortion are suppressed by the balance detection, and the IQ amplitude and the phase balance can be finely corrected by optical power and a polarization state.

Description

technical field [0001] The invention relates to the technical fields of optical communication and microwave technology, and mainly relates to realizing zero-IF channelized reception of broadband microwave signals by using photonics technology. Background technique [0002] In modern electronic warfare and radar systems, the microwave signal received by the receiver has a wide bandwidth, a variety of types, and various forms, and the frequency coverage is gradually increasing. This requires the receiver to have a large instantaneous receiving bandwidth, be able to process multi-frequency and multi-form signals at the same time, and have the characteristics of high resolution and high sensitivity. However, the sampling rate and bandwidth of existing analog-to-digital converters (ADCs) are limited, and it is impossible to realize the simultaneous processing of ultra-large bandwidth signals. The channelized receiver can divide the received broadband signal into multiple sub-ban...

AI Technical Summary

Problems solved by technology

However, it is difficult to produce an optical frequency comb with multiple comb lines, wide intervals, and stable coherence, and this solution requires two sets of optical combs to have precise frequency difference and stable phase relationship, which makes system implementation difficult

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