Abstract
A compact system with multiple signal processing functions is of interest in many applications. The purpose of this paper is to present a microwave photonic structure that is capable of simultaneously realising in-phase/quadrature (I/Q) mixing and phase shifting operations. The multi-function signal processor has a simple structure and can be constructed using off-the-shelf components. It is designed to enable commercial modulator bias controllers to be incorporated into the system to provide accurate phase shift and to improve system stability. Non-ideal effects in the system that cause deviation in the two output IF signal phase difference from 90° can be mitigated by adjusting a modulator bias voltage. The multi-function signal processor is theoretically analysed and experimentally demonstrated. Its performance including two output IF signals with a quadrature phase difference, wideband operation, continuous 0° to 360° IF signal phase shift and long-term stable operation are verified experimentally.
Highlights
There is on-going research in processing microwave and millimetre wave signal in optical domain since 1980s
A microwave photonic structure based on a dual-polarisation binary phase shift keying (DP-BPSK) modulator and an optical bandpass filter (OBPF), that is capable to realise frequency down conversion with two phase-tunable quadrature-phase intermediate frequency (IF) signals, has been presented
The I/Q mixer and phase shifter structure is designed to enable commercial bias controllers to be incorporated into the system to eliminate the modulator bias drift problem
Summary
There is on-going research in processing microwave and millimetre wave signal in optical domain since 1980s. This is because microwave photonic signal processors have the potential of very wide bandwidth, high reconfigurability, parallel processing and multi-function capabilities [1], [2]. They can be designed to be compatible with fibre optic communication systems. Recent research focuses on including additional functions such as phase shifting operation in a microwave photonic mixer [22], [23]
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