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Integrated Nonreciprocal Devices for Application in Optical Communication Systems

Published online by Cambridge University Press:  10 February 2011

T. Shintaku,
N. Sugimoto,
A. Tate,
E. Kubota,
H. Kozawaguchi and
Y. Katoh
T. Shintaku
Affiliation:
NTT Opto-electronics Laboratories, Tokai, Ibaraki, 319-1193 JAPAN, shintaku@iba.iecl.ntt.co.jp
N. Sugimoto
Affiliation:
NTT Opto-electronics Laboratories, Tokai, Ibaraki, 319-1193, JAPAN
A. Tate
Affiliation:
NTT Opto-electronics Laboratories, Tokai, Ibaraki, 319-1193, JAPAN
E. Kubota
Affiliation:
NTT Opto-electronics Laboratories, Tokai, Ibaraki, 319-1193, JAPAN
H. Kozawaguchi
Affiliation:
NTT Opto-electronics Laboratories, Tokai, Ibaraki, 319-1193, JAPAN
Y. Katoh
Affiliation:
NTT Opto-electronics Laboratories, Tokai, Ibaraki, 319-1193, JAPAN
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Abstract

We describe our recently developed integrated isolators. Their structure is simple, in that it consists solely of a single-mode channel magneto-optic waveguide. The operating principle is that a backward fundamental TM mode wave is converted to higher-order or radiation TE modes while a forward fundamental TM mode wave propagates with no mode conversion. These isolators are realized using a single-mode rib channel waveguide in Ce-substituted yttrium iron garnet which has a very large Faraday rotation. We obtain 13-27 dB isolation around a wavelength of 1.55 μm. We also review our recent study on a hybrid-integrated polarization-independent optical circulator based on a nonreciprocal Mach-Zehnder interferometer which does not need a polarization-beam splitter. We obtain 14.1-23.7 dB isolation at λ = 1.55 μm.

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