Journal
JOURNAL OF LIGHTWAVE TECHNOLOGY
Volume 34, Issue 8, Pages 1699-1705Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2015.2505538
Keywords
Integrated optics; magneto-optical garnet; phase shift; waveguide optical isolator
Funding
- JSPS KAKENHI [26249047]
- Grants-in-Aid for Scientific Research [16K06295, 26249047] Funding Source: KAKEN
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Optical isolators play unique roles in photonic circuits. We have developed an optical isolator with silicon waveguides, based on a Mach-Zehnder interferometer. The device characteristics were temperature dependent. We investigated the temperature dependence of the refractive index (dn/dT) and the magneto-optical coefficient (d theta(f) /dT) of a magneto-optical garnet Ce:YIG, and estimated these as 9.1 x 10(-5) K-1 and 44 degrees . cm(-1) . K-1, respectively. We discuss the design of an athermal silicon waveguide optical isolator, in which the temperature dependences of the magneto-optical effect and refractive indices are canceled in the backward direction. The high optical isolation, greater than 20 dB, is demonstrated for temperature in the 20-60 degrees C range.
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