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Design and Characterization Methodology for Efficient Wide Range Tunable MEMS Filters

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Narrowband tunable photonic notch filter.

A A Savchenkov¹, W Liang, A B Matsko

¹OEwaves, Inc., 2555 East Colorado Boulevard, Pasadena, California 91107, USA.

|May 5, 2009

Summary

We developed a novel tunable notch filter using whispering-gallery-mode resonators. This device offers high contrast and low insertion loss, crucial for optical signal processing applications.

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Area of Science:

Photonics
Optical Engineering
Materials Science

Background:

Whispering-gallery-mode (WGM) resonators are sensitive to optical properties.
Developing tunable optical filters with high performance is essential for advanced optical systems.

Purpose of the Study:

To demonstrate a high-contrast, tunable, low-insertion-loss notch filter.
To utilize the polarization selectivity of WGM resonators for filter realization.

Main Methods:

Employing polarization selectivity of whispering-gallery-mode resonators.
Fabricating and characterizing a notch filter with specific performance metrics.

Main Results:

Achieved a 10 MHz notch filter with 5.5 dB insertion loss.
Demonstrated 45.5 dB in-band rejection, limited by laser linewidth.
Showcased potential for tunable bandwidth without compromising rejection.

Conclusions:

The proposed technique enables efficient notch filtering using WGM resonators.
The filter exhibits promising characteristics for tunable optical signal processing.
Further improvements are possible with narrower laser linewidths.