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Silica-based, compact and variable-optical-attenuator integrated coherent receiver with stable optoelectronic

Satoshi Tsunashima1, Fumito Nakajima, Yusuke Nasu

  • 1NTT Photonics Laboratories, NTT Corporation, Atsugi, Kanagawa, Japan.

Optics Express
|November 29, 2012
PubMed
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We developed a compact integrated coherent receiver with a variable optical attenuator (VOA) on a single chip. This device achieves a wide dynamic range, enabling the demodulation of high-speed signals.

Area of Science:

  • Photonics and Optical Engineering
  • Integrated Optics
  • Telecommunications

Background:

  • Coherent receivers are crucial for high-speed optical communication systems.
  • Integrating components like variable optical attenuators (VOAs) into compact receiver designs presents significant engineering challenges.
  • Achieving a wide dynamic range in optical receivers is essential for handling varying signal strengths.

Purpose of the Study:

  • To demonstrate a compact, integrated coherent receiver incorporating a variable optical attenuator (VOA).
  • To enhance the dynamic range of optical receivers through VOA integration.
  • To validate the performance of the integrated VOA coherent receiver with high-speed optical signals.

Main Methods:

  • Fabrication of a silica-based planar lightwave circuit (PLC) integrating a VOA, polarization beam splitters, and optical 90-degree hybrids.

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  • Development of a stable optoelectronic coupling system using micro lens arrays and photodiode (PD) subcarriers with high-speed signal lines.
  • Integration of the VOA and coherent receiver into a compact 27x40x6 mm package.

    • Main Results:

    • Successful integration of a VOA and coherent receiver onto a single PLC chip.
    • Demonstration of a compact receiver package measuring 27x40x6 mm.
    • Demodulation of a 128-Gbit/s polarization division multiplexed (PDM) quadrature phase shift keying (QPSK) signal.
    • Achieved a VOA-assisted wide dynamic range exceeding 30 dB.

    Conclusions:

    • The integrated VOA coherent receiver offers a compact solution for high-speed optical communications.
    • The VOA integration significantly enhances the receiver's dynamic range, improving signal handling capabilities.
    • This compact design is suitable for advanced optical networking applications requiring robust performance and small form factors.