Tunable Germanium-on-Insulator Band-Stop Optical Filter Using Thermo-Optic Effect

Tunable Germanium-on-Insulator Band-Stop Optical Filter Using Thermo-Optic Effect

We demonstrate a tunable band-stop optical filter on a germanium-on-insulator photonic platform operating at 1.95 <italic>&#x03BC;</italic>m wavelength. The band-stop filter is implemented using parallel-coupled microring resonators with the number of microring resonators varied from...

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Bibliographic Details
Main Authors: Chong Pei Ho, Ziqiang Zhao, Qiang Li, Shinichi Takagi, Mitsuru Takenaka
Format: Article
Language:English
Published: IEEE 2020-01-01
Series:IEEE Photonics Journal
Subjects:
Tunable filter
optical resonators
thermal effects
Online Access:https://ieeexplore.ieee.org/document/8664084/
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Summary:We demonstrate a tunable band-stop optical filter on a germanium-on-insulator photonic platform operating at 1.95 <italic>&#x03BC;</italic>m wavelength. The band-stop filter is implemented using parallel-coupled microring resonators with the number of microring resonators varied from one to. three. Through the use of a heating stage, the thermo-optic coefficient of germanium is measured to be &#x002B;3.55 &#x00D7; 10<sup>&#x2212;4</sup>&#x002F;&#x00B0;C. The high thermo-optic coefficient of germanium is exploited by including metal heating lines to provide localized on-chip tuning. As predicted by theoretical analysis, our experimental results show that when the number of microring resonators increases, the &#x2212;3 dB bandwidth and extinction ratio of the optical filter increases. With the number of microring resonators increases from one to three, the &#x2212;3 dB bandwidth of the filter increases from 0.283 to 0.661 nm and the extinction ratio from 9.56 to 22.10 dB.
ISSN:1943-0655

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