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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

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Photonic downconversion with tunable wideband phase shift.

Tianwei Jiang, Song Yu, Ruihuan Wu

|June 1, 2016

Summary

This summary is machine-generated.

This study introduces a novel microwave photonic frequency downconversion system. It achieves wideband operation and continuous phase shift for radio frequency signals, enabling flexible signal processing.

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Area of Science:

Photonics
Microwave Engineering
Optical Signal Processing

Background:

Traditional frequency downconversion methods face limitations in bandwidth and phase control.
Photonic approaches offer potential for enhanced performance in microwave signal processing.

Purpose of the Study:

To propose and experimentally demonstrate a microwave photonic frequency downconversion system.
To achieve wideband operation and continuous phase-shift control for downconverted signals.

Main Methods:

Utilizing a dual-drive Mach-Zehnder modulator (DMZM) for radio frequency (RF) and local oscillator (LO) signal modulation.
Employing a fiber Bragg grating (FBG) to select and reflect specific optical sidebands.
Implementing phase-shift control via DMZM bias voltage or laser wavelength adjustment.

Main Results:

Demonstrated a full 0° to 360° continuous phase shift capability.
Successfully downconverted RF signals from 12 GHz to 20 GHz to intermediate frequencies (IFs) below 4 GHz.
Achieved phase deviation below 2° and magnitude fluctuation within ±1 dB over a wideband range.

Conclusions:

The proposed microwave photonic system offers a robust solution for wideband frequency downconversion with precise phase control.
This technology has potential applications in advanced communication and radar systems requiring flexible signal manipulation.