The design of an ultra-wideband waveguide magneto-optical isolator is described. The isolator is based on a Mach-Zehnder interferometer employing nonreciprocal phase shift. The ultra-wideband design is realized by adjusting the wavelength dependence of reciprocal phase difference to compensate for that of nonreciprocal phase difference in the backward direction. We obtained the ultra-wideband design that provides isolation > 35dB from 1.25μm to >1.65μm. This is the proposal of magneto-optical isolator that operates both in 1.31μm band and 1.55μm band.

© 2007 Optical Society of America

1. F. Auracher and H. H. Witte, "A new design for an integrated optical isolator," Opt. Commun. 13,435-438 (1975). [CrossRef]
2. T. Mizumoto, K. Oochi, T. Harada, and Y. Naito, "Measurement of optical nonreciprocal phase shift in a Bi-substituted Gd3Fe5O12 film and application to waveguide-type optical circulator," J. Lightwave Technol. LT-4,347-352 (1986). [CrossRef]
3. J. Fujita, M. Levy, R. M. Osgood, Jr. L. Wilkens, and H. Dötsch, "Waveguide optical isolator based on Mach-Zehnder interferometer," Appl. Phys. Lett. 76,2158-2160 (2000). [CrossRef]
4. H. Dötsch, N. Bahlmann, O. Zhuromskyy, M. Hammer, L. Wilkens, R. Gerhardt, and P. Hertel, "Application of magneto-optical waveguides in integrated optics: review," J. Opt. Soc. Am. B 22,240-253 (2005). [CrossRef]
5. H. Yokoi, T. Mizumoto, N. Shinjo, N. Futakuchi, and Y. Nakano, "Demonstration of an optical isolator, with a semiconductor guiding layer that was obtained by use of a nonreciprocal phase shift," Appl. Opt. 39,6158-6164 (2000). [CrossRef]
6. Y. Shoji and T. Mizumoto, "Wideband design of nonreciprocal phase shift magneto-optical isolators using phase adjustment in Mach-Zehnder interferometer," Appl. Opt. 45,7144-7150 (2006). [CrossRef] [PubMed]

Appl. Opt.

• H. Yokoi, T. Mizumoto, N. Shinjo, N. Futakuchi, and Y. Nakano, "Demonstration of an optical isolator, with a semiconductor guiding layer that was obtained by use of a nonreciprocal phase shift," Appl. Opt. 39,6158-6164 (2000). [CrossRef]
• Y. Shoji and T. Mizumoto, "Wideband design of nonreciprocal phase shift magneto-optical isolators using phase adjustment in Mach-Zehnder interferometer," Appl. Opt. 45,7144-7150 (2006). [CrossRef] [PubMed]

Appl. Phys. Lett.

• J. Fujita, M. Levy, R. M. Osgood, Jr. L. Wilkens, and H. Dötsch, "Waveguide optical isolator based on Mach-Zehnder interferometer," Appl. Phys. Lett. 76,2158-2160 (2000). [CrossRef]

J. Lightwave Technol.

• T. Mizumoto, K. Oochi, T. Harada, and Y. Naito, "Measurement of optical nonreciprocal phase shift in a Bi-substituted Gd3Fe5O12 film and application to waveguide-type optical circulator," J. Lightwave Technol. LT-4,347-352 (1986). [CrossRef]

J. Opt. Soc. Am. B

• H. Dötsch, N. Bahlmann, O. Zhuromskyy, M. Hammer, L. Wilkens, R. Gerhardt, and P. Hertel, "Application of magneto-optical waveguides in integrated optics: review," J. Opt. Soc. Am. B 22,240-253 (2005). [CrossRef]

Opt. Commun.

• F. Auracher and H. H. Witte, "A new design for an integrated optical isolator," Opt. Commun. 13,435-438 (1975). [CrossRef]

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