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Silicon cross-connect filters using microring resonator coupled multimode-interference-based waveguide crossings.

Fang Xu1, Andrew W Poon

  • 1Photonic Device Laboratory, Department of Electronic and Computer Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong SAR, China.

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Summary

New silicon cross-connect filters using microring resonator coupled multimode-interference (MMI) waveguide crossings reduce crosstalk. These filters offer improved performance for optical communication applications, demonstrating practical filter designs.

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Area of Science:

  • Photonics
  • Optical Engineering
  • Materials Science

Background:

  • Microring resonator filters are crucial components in optical communication systems.
  • Conventional waveguide crossings in filters often suffer from high crosstalk, limiting device performance.
  • Multimode-interference (MMI) structures offer potential for improved optical signal routing.

Purpose of the Study:

  • To develop and experimentally validate novel silicon cross-connect filters utilizing microring resonator coupled MMI-based waveguide crossings.
  • To evaluate the crosstalk performance and resonance line shape of the proposed MMI-based filters compared to conventional designs.
  • To demonstrate the feasibility of these filters for practical cross-connection applications.

Main Methods:

  • Fabrication of silicon-on-insulator (SOI) based photonic integrated circuits.
  • Integration of microring resonators with MMI-based waveguide crossings.
  • Experimental characterization of filter performance, including crosstalk and transmission spectra.

Main Results:

  • MMI-based cross-connect filters exhibited significantly lower crosstalk at waveguide crossings compared to conventional filters.
  • The proposed filters demonstrated a nearly symmetric resonance line shape in the drop-port transmission.
  • Successful demonstration of a 4-channel 1x4 linear-cascaded and a 2-channel 2x2 array-cascaded MMI-based cross-connect filter.

Conclusions:

  • Microring resonator coupled MMI-based waveguide crossings provide a superior solution for silicon cross-connect filters.
  • The developed filters offer enhanced performance with reduced crosstalk, suitable for advanced optical networking.
  • The proof-of-concept devices validate the potential of MMI-based structures for integrated photonic applications.