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

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

Published on: September 5, 2019

Polarization-insensitive photonic microwave downconversion.

Xiaowen Gu¹, Shilong Pan, Zhenzhou Tang

¹Microwave Photonics Research Laboratory, College of Electronic and Information Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, China. pans@ieee.org

|July 2, 2013

Summary

This summary is machine-generated.

This study introduces a novel photonic microwave downconverter that is insensitive to polarization. The device successfully downconverts radio-over-fiber signals with minimal performance variation across different polarization states.

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Area of Science:

Photonics and Optical Engineering
Microwave Engineering
Radio-over-Fiber Communications

Background:

Traditional photonic microwave downconverters often suffer from polarization-dependent performance, limiting their practical application.
Maintaining signal integrity in radio-over-fiber (RoF) systems is crucial for reliable data transmission.

Purpose of the Study:

To propose and demonstrate a polarization-insensitive photonic microwave downconverter.
To evaluate the downconverter's performance in a radio-over-fiber link.

Main Methods:

The proposed downconverter utilizes a polarization beam splitter, two Mach-Zehnder modulators (MZMs) biased at quadrature points with opposing slopes, and a balanced photodetector.
Experiments were conducted to measure polarization-dependent loss and evaluate performance in a RoF link with a 20 GHz RF signal and 16-QAM data.

Main Results:

The photonic microwave downconverter demonstrated polarization-insensitive operation with polarization-dependent loss below 0.06 dB.
Successful downconversion of a 20 GHz RF signal (20 MBaud, 16-QAM) to a 1 GHz IF signal was achieved.
Error vector magnitude variation remained below 0.4% despite adjustments to the input signal's polarization state.

Conclusions:

The proposed design effectively mitigates polarization-dependent effects in photonic microwave downconversion.
The demonstrated downconverter is suitable for robust radio-over-fiber systems requiring stable performance.