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High-speed optical switch fabrics with large port count.

Yong-Kee Yeo1, Zhaowen Xu, Dawei Wang

  • 1Institute for Infocomm Research, Singapore, Singapore. ykyeo@ieee.org

Optics Express
|June 25, 2009
PubMed
Summary

Researchers developed a new optical switch fabric architecture enabling high port counts and nanosecond switching speeds. This novel design overcomes crosstalk limitations of previous technologies, achieving the highest reported port count for this switch type.

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Area of Science:

  • Photonics and Optical Engineering
  • Telecommunications Technology
  • Integrated Optics

Background:

  • High port count and nanosecond switching speed are critical yet challenging requirements for optical switch fabrics.
  • Current solutions often combine wavelength-tunable lasers and arrayed waveguide grating routers (AWGRs), but scaling AWGRs increases crosstalk noise.
  • Directly increasing the channel count of AWGRs leads to significant crosstalk issues due to narrow wavelength spacing.

Purpose of the Study:

  • To propose and demonstrate a novel architecture for constructing high-port count optical switch fabrics.
  • To overcome the crosstalk limitations inherent in scaling traditional AWGR-based optical switches.
  • To achieve ultra-fast switching speeds (nanoseconds) combined with a very high number of ports.

Main Methods:

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  • Proposed a new architecture utilizing a combination of low-port count arrayed waveguide grating routers (AWGRs), optical ON-OFF gates, and Wavelength Division Multiplexing (WDM) couplers.
  • Developed a methodology to construct scalable optical switch fabrics by mitigating crosstalk.
  • Implemented a proof-of-concept experiment to validate the proposed architecture.

Main Results:

  • Successfully demonstrated a 256 x 256 optical switch fabric.
  • Achieved a port count significantly higher than previously reported for similar switch fabric types.
  • Validated the feasibility of the novel architecture for high-performance optical switching.

Conclusions:

  • The proposed architecture effectively enables the construction of optical switch fabrics with unprecedented high port counts.
  • This novel approach overcomes the crosstalk challenges associated with scaling AWGRs, paving the way for more advanced optical networks.
  • The demonstrated 256 x 256 switch fabric represents a significant advancement in optical switching technology.