Box-like filter response and expansion of FSR by a vertically triple coupled microring resonator filter

Author

Yanagase, Yuji ; Suzuki, Shuichi ; Kokubun, Yasuo ; Chu, Sai Tak

Author_Institution

Graduate Sch. of Eng., Yokohama Nat. Univ., Japan

Volume

20

Issue

8

fYear

2002

fDate

8/1/2002 12:00:00 AM

Firstpage

1525

Lastpage

1529

Abstract

The Lorentzian-shape filter response of a microring resonator filter is not suitable for practical use in wavelength division multiplexing (WDM) systems because of the lack of passband flatness, high crosstalk, and the large wing in the rejection band. Therefore, the tailoring of filter response shape is required to improve the performance. The series coupled microring resonator is one of the solutions. We designed and fabricated vertically triple coupled microring resonator add/drop filters with a stacked configuration. A box-like filter response with a flat passband was successfully obtained, and the free spectral range (FSR) was expanded to 25.8 nm owing to the Vernier effect.

Keywords

band-pass filters; integrated optics; micro-optics; optical communication equipment; optical crosstalk; optical waveguide filters; resonator filters; wavelength division multiplexing; Lorentzian-shape filter response; SiO₂ cladding; Vernier effect; WDM systems; add/drop filters; box-like filter response; busline waveguides; crosstalk; filter response shape tailoring; free spectral range expansion; passband flatness; radiation loss; rejection band wing; series coupled microring resonator; stacked configuration; vertically triple coupled microring resonator filter; wavelength division multiplexing; Arrayed waveguide gratings; Band pass filters; Crosstalk; Optical filters; Optical resonators; Optical waveguides; Passband; Resonator filters; Shape; Wavelength division multiplexing;

fLanguage

English

Journal_Title

Lightwave Technology, Journal of

Publisher

ieee

ISSN

0733-8724

Type

jour

DOI

10.1109/JLT.2002.800296

Filename

1058164