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Hybrid optical circulator using garnet-quartz composite embedded in planar waveguides

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7 Author(s)
Hanashima, N. ; Data Storage & Thin Film Technol. Components Bus. Group, TDK Corp., Chiba, Japan ; Hata, K. ; Mochida, R. ; Oikawa, T.
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A novel hybrid configuration of optical circulator is presented. A Garnet-Quartz composite (GQC), which is comprised of four quarter-wave plates and Faraday rotator, is embedded into a groove formed across the branching waveguides pair of Mach-Zehnder interferometer. Optical path difference of the pair is 0 rad for forward path, whereas π for backward path with the GQC, realizing nonreciprocal operation. The forward-to-reverse isolation of 16.2-29.8 dB and the insertion loss of 8.8-9.4 dB are obtained.

Published in:

Photonics Technology Letters, IEEE  (Volume:16 ,  Issue: 10 )