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Quasi-light Storage for Optical Data Packets
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Slow-light-based variable symbol-rate silicon photonics DQPSK receiver.

Keijiro Suzuki1, Hong C Nguyen, Takemasa Tamanuki

  • 1Department of Electrical and Computer Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogayaku, Yokohama, 240-8501, Japan.

Optics Express
|March 16, 2012
PubMed
Summary

This study presents a silicon receiver for differential quadrature phase-shift keying (DQPSK) signals. Its symbol rate is tunable using a novel slow-light device, enabling flexible data transmission rates up to 18.0 Gb/s.

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Area of Science:

  • Photonics and optical communications
  • Integrated silicon photonics
  • High-speed optical receivers

Background:

  • Differential quadrature phase-shift keying (DQPSK) is a spectrally efficient modulation format.
  • Tunable symbol rates are crucial for flexible optical networks.
  • Silicon photonics offers a CMOS-compatible platform for integrated optical devices.

Purpose of the Study:

  • To demonstrate a tunable silicon DQPSK receiver.
  • To integrate key photonic components for high-speed optical signal processing.
  • To achieve variable symbol rate demodulation using slow-light technology.

Main Methods:

  • Fabrication of a silicon DQPSK receiver using CMOS-compatible processes.
  • Integration of Si-wire waveguides, spot-size converters, splitters/couplers, Mach-Zehnder attenuators and phase shifters.

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  • Utilizing a tunable one-bit delay line with an all-pass micro-ring slow-light device for symbol rate tuning.
  • Incorporation of a 90° hybrid with a low-loss crossing and balanced germanium photodiodes for demodulation.

    • Main Results:

    • Successful demodulation of DQPSK signals was confirmed.
    • The receiver demonstrated tunable symbol rates ranging from 7.4 to 9.0 Gbaud.
    • Achieved bit-rates varied from 14.8 to 18.0 Gb/s, showcasing the device's flexibility.

    Conclusions:

    • The developed silicon DQPSK receiver offers tunable symbol rate capabilities.
    • The integration of slow-light devices enables flexible data rates in silicon photonic systems.
    • This technology holds promise for future high-speed, reconfigurable optical communication systems.