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Narrow band wavelength selective filter using grating assisted single ring resonator.

P Prabhathan1, V M Murukeshan1

  • 1Centre for Optical & Laser Engineering (COLE), School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798.

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Summary

This study presents a novel silicon photonics filter using a ring and grating resonator for precise single wavelength selection and switching. This device offers high performance for on-chip applications like lasers and biosensors.

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Area of Science:

  • Photonics
  • Optical Engineering
  • Materials Science

Background:

  • On-chip optical filters are crucial for wavelength selection in integrated photonic circuits.
  • Existing filters often face challenges with selectivity, switching, and integration.
  • Silicon photonics offers a scalable platform for developing advanced optical devices.

Purpose of the Study:

  • To propose and demonstrate a novel filter configuration for single wavelength selectivity and switching.
  • To design a grating resonator with high Q-factor, high transmittivity, and minimal loss.
  • To explore applications in silicon photonics, including on-chip lasers and biosensors.

Main Methods:

  • A filter configuration combining a ring resonator and a grating resonator was designed.
  • The grating resonator was optimized for high performance metrics.
  • A proof-of-concept device was fabricated on a Silicon-on-Insulator (SOI) platform using electron beam lithography and Reactive Ion Etching (RIE).

Main Results:

  • The device demonstrated narrow-band single wavelength selection and switching.
  • A high Free Spectral Range (FSR) of approximately 60 nm was achieved.
  • A sideband rejection ratio greater than 15 dB was observed, indicating high selectivity.

Conclusions:

  • The proposed filter configuration effectively achieves single wavelength selectivity and switching.
  • The device's performance is suitable for on-chip wavelength selection applications.
  • This technology holds promise for advancing silicon photonics devices.