Abstract
A scheme for realizing a zero-intermediate frequency (IF) channelized receiver using a dual-polarization quadrature phase-shift keying (DP-QPSK) modulator and a narrow-band optical filter is proposed. The channelized system only requires one optical frequency comb to achieve zero-IF multi-channel reception of wideband signals, and the spacing of the optical frequency comb only needs to be equal to the sub-channel width, which is very easy to implement. It is found that using photonic IQ demodulation and balanced detection and reception technology can not only eliminate many disadvantages of the traditional zero-IF receiver, including local oscillator (LO) leakage, direct current (DC) offset, even-order distortion, and in-phase/quadrature (I/Q) imbalance, but also reduce the bandwidth and sample rate of the analog-to-digital converter (ADC). It is theoretically proven that the radio frequency (RF) signal with a bandwidth of 3 GHz can be divided into five sub-channels with a bandwidth of 600 MHz and finally demodulated to I/Q basebands, which are also verified with simulation.
Highlights
The receiving technology of ultra-wideband (UWB) radio frequency signal has always been a research hotspot in the field of communication
The radar system or electronic warfare needs to process multiple signals of different frequencies arriving at the same time in real time, which can be achieved through a channelized receiver by segmenting the electromagnetic spectrum, so as to realize the full probability interception of signals in the monitoring range of the UWB
It mainly consists of a laser diode (LD), a dual-polarization quadrature phase-shift keying (DP-QPSK) modulator, two local oscillator (LO) signals (LO1 and LO2), a set of optical bandpass filters (OBPFs), a single polarization MZM, several controllers (PCs), several polarization beam splitters (PBSs), and several pairs
Summary
The receiving technology of ultra-wideband (UWB) radio frequency signal has always been a research hotspot in the field of communication. The radar system or electronic warfare needs to process multiple signals of different frequencies arriving at the same time in real time, which can be achieved through a channelized receiver by segmenting the electromagnetic spectrum, so as to realize the full probability interception of signals in the monitoring range of the UWB. The optical signals are not transformed to electrical signals before the balanced photodiode (BPD) Since it meets the current demand for large bandwidth in many fields, the channelized receiver based on photonics has become a research hotspot [6,7,8,9,10,11]. Due to the use of photonic I/Q demodulation and balanced detection reception technology, the ADC bandwidth and sampling rate are reduced, and the LO leakage, direct current (DC) offset, even distortion, I/Q imbalance, etc. of the traditional zero-IF receiver are eliminated
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
