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Updated: May 27, 2026

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
Published on: September 5, 2019
I/Q intensity-demodulation analog photonic link based on polarization modulator
1State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing, 100876, China.
This study introduces a novel analog photonic link using polarization modulation for high linearity. The new design suppresses third-order intermodulation distortion by over 40 dB, enhancing signal fidelity.
Area of Science:
- Photonics
- Analog Signal Processing
- Optical Communications
Background:
- Analog photonic links are crucial for high-frequency signal transmission.
- Achieving high linearity and suppressing intermodulation distortion are key challenges.
Purpose of the Study:
- To experimentally demonstrate a high-linearity analog photonic link.
- To investigate a polarization-modulation intensity-demodulation scheme.
- To improve spurious free dynamic range (SFDR) and reduce distortion.
Main Methods:
- Utilized a polarization modulator (PolM) with light polarization at 45° to the principal axis.
- Employed a polarization-modulation to intensity-modulation conversion.
- Implemented in-phase/quadrature (I/Q) intensity-demodulation using optical couplers (OC) and polarization beam splitters (PBS).
Main Results:
- Achieved suppression of third-order intermodulation distortion (IMD3) by over 40 dB.
- Demonstrated a link gain of -11.5 dB and a noise figure of 26.5 dB.
- Obtained a third-order limited SFDR of 124 dB in a 1 Hz bandwidth.
Conclusions:
- The proposed polarization-modulation scheme offers high linearity and immunity to optical phase noise.
- A single PolM simplifies the system, avoiding dual modulator matching requirements.
- This approach significantly enhances the performance of analog photonic links.
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