An Ultra-Wideband Microwave Photonic Channelized Receiver with Zero-IF Architecture

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.

Deep learning-based image-like channelization for broadband receiver

“…In a modern WDM-based coherent optical communication system, the baud rate of a single wavelength can be over 100 GHz, imposing strong bandwidth requirements for the electrical hardware, including the ADC and DSP. In recent years, there has been considerable progress in channelization for a coherent optical communication system [1][2][3][4][5][6][7], but little work has been done to propose optimization methods for a single channel. Moreover, the ultra-high sampling rate of the ADCs beyond 100 GHz and ultra-fast DSP to perform real-time distortion compensation are needed for a 1 Tb/s communication system.…”