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Updated: Sep 11, 2025

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

Optic-electronic-optic (OEO) interferometer enabling coherent optical add-drop multiplexing.

Md Salek Mahmud, Patrick Matalla, Joel Dittmer

|August 13, 2025

Summary

This summary is machine-generated.

We demonstrated the first optic-electronic-optic interferometer using digital signal processing for stable optical signal add-drop functionality. This advancement enables robust performance in optical communication systems.

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Last Updated: Sep 11, 2025

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Area of Science:

Optoelectronics
Optical Communications
Digital Signal Processing

Background:

Optic-electronic-optic (OEO) interferometers are crucial for advanced optical signal processing.
Achieving stable and functional OEO systems requires sophisticated control mechanisms.

Purpose of the Study:

To experimentally demonstrate a novel OEO interferometer.
To showcase the add-drop functionality of optical quadrature phase-shift keying (QPSK) signals within the OEO system.
To achieve long-term stable operation through active phase stabilization.

Main Methods:

Utilized coherent detection and real-time digital signal processing (DSP).
Implemented electro-optic in-phase/quadrature (I/Q) remodulation in one interferometer path.
Integrated endless active phase stabilization within the DSP for sustained performance.

Main Results:

Successfully demonstrated the first experimental OEO interferometer.
Quantified system performance and validated add-drop functionality for optical QPSK signals.
Achieved long-term stable operation via DSP-based phase stabilization.

Conclusions:

The presented OEO interferometer design is effective for optical signal processing.
The system enables stable add-drop multiplexing of QPSK signals.
DSP-based active phase stabilization is key to achieving robust and long-term operational stability.