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Related Experiment Video

Updated: May 22, 2026

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

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Single silicon wire waveguide based delay line interferometer for DPSK demodulation.

Rai Kou1, Hidetaka Nishi, Tai Tsuchizawa

  • 1NTT Microsystem Integration Laboratories, NTT Corporation, Atsugi, Kanagawa, Japan. takahashi.rai@lab.ntt.co.jp

Optics Express
|May 9, 2012
PubMed
Summary

We developed a compact silicon photonic wire waveguide for high-quality differential phase shift keying (DPSK) demodulation. This device achieves error-free 10 Gb/s data transmission, showing great potential for optical communication systems.

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Area of Science:

  • Photonics
  • Optical Communications
  • Integrated Optics

Background:

  • Differential phase shift keying (DPSK) is a key modulation format in optical communications.
  • Silicon photonics offers a platform for compact and efficient optical devices.
  • Existing DPSK demodulators face challenges in size and performance.

Purpose of the Study:

  • To demonstrate a high-quality DPSK demodulator using a silicon photonic wire waveguide.
  • To design an ultra-compact and high-extinction-ratio delay line interferometer.
  • To evaluate the performance and feasibility of the proposed device for DPSK demodulation.

Main Methods:

  • Experimental demonstration of a silicon photonic wire waveguide.
  • Design and simulation of a delay line interferometer considering waveguide birefringence.

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Last Updated: May 22, 2026

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  • Measurement of interference spectrum, eye pattern, bit error rate, and temperature dependence.

    • Main Results:

    • A free spectral range of 9.6 GHz was achieved with a 2.8 cm-long wire waveguide.
    • Error-free DPSK demodulation at approximately 10 Gb/s was successfully obtained.
    • The device exhibited good performance and temperature stability.

    Conclusions:

    • The silicon photonic wire waveguide is a viable platform for high-performance DPSK demodulation.
    • The developed ultra-compact interferometer enables efficient and high-extinction-ratio operation.
    • This technology holds promise for advancing optical communication systems.