Abstract

A wideband operation of a magneto-optical isolator is demonstrated. The isolator is based on a Mach-Zehnder interferometer employing nonreciprocal phase shift. The wideband operation is achieved by adjusting a reciprocal phase difference in the interferometer. We designed and fabricated a wideband isolator with a magneto-optic garnet waveguide. The isolation ratio of 15-25dB was obtained in a wavelength range from 1530nm to 1640nm.

© 2007 Optical Society of America

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  1. K. Ando, T. Okoshi, and N. Koshizuka, "Waveguide magneto-optical isolator fabricated by laser annealing," Appl. Phys. Lett. 53,4-6 (1988).
    [CrossRef]
  2. T. Shintaku, "Integrated optical isolator based on efficient nonreciprocal radiation mode conversion," Appl. Phys. Lett. 73,1946-1948 (1998).
    [CrossRef]
  3. F. Auracher and H. H. Witte, "A new design for an integrated optical isolator," Opt. Commun. 13,435-438 (1975).
    [CrossRef]
  4. 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]
  5. 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]
  6. 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]
  7. 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]
  8. 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]
  9. Y. Shoji and T. Mizumoto, "Ultra-wideband design of waveguide magneto-optical isolator operating in 1.31μm and 1.55μm band," Opt. Express 15,639-645 (2007).
    [CrossRef] [PubMed]

2007 (1)

2006 (1)

2005 (1)

2000 (2)

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]

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]

1998 (1)

T. Shintaku, "Integrated optical isolator based on efficient nonreciprocal radiation mode conversion," Appl. Phys. Lett. 73,1946-1948 (1998).
[CrossRef]

1988 (1)

K. Ando, T. Okoshi, and N. Koshizuka, "Waveguide magneto-optical isolator fabricated by laser annealing," Appl. Phys. Lett. 53,4-6 (1988).
[CrossRef]

1986 (1)

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]

1975 (1)

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

Ando, K.

K. Ando, T. Okoshi, and N. Koshizuka, "Waveguide magneto-optical isolator fabricated by laser annealing," Appl. Phys. Lett. 53,4-6 (1988).
[CrossRef]

Auracher, F.

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

Bahlmann, N.

Dötsch, H.

Fujita, J.

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]

Futakuchi, N.

Gerhardt, R.

Hammer, M.

Harada, T.

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]

Hertel, P.

Koshizuka, N.

K. Ando, T. Okoshi, and N. Koshizuka, "Waveguide magneto-optical isolator fabricated by laser annealing," Appl. Phys. Lett. 53,4-6 (1988).
[CrossRef]

Levy, M.

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]

Mizumoto, T.

Naito, Y.

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]

Nakano, Y.

Okoshi, T.

K. Ando, T. Okoshi, and N. Koshizuka, "Waveguide magneto-optical isolator fabricated by laser annealing," Appl. Phys. Lett. 53,4-6 (1988).
[CrossRef]

Oochi, K.

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]

Osgood, R. M.

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]

Shinjo, N.

Shintaku, T.

T. Shintaku, "Integrated optical isolator based on efficient nonreciprocal radiation mode conversion," Appl. Phys. Lett. 73,1946-1948 (1998).
[CrossRef]

Shoji, Y.

Wilkens, L.

Witte, H. H.

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

Yokoi, H.

Zhuromskyy, O.

Appl. Opt. (2)

Appl. Phys. Lett. (3)

K. Ando, T. Okoshi, and N. Koshizuka, "Waveguide magneto-optical isolator fabricated by laser annealing," Appl. Phys. Lett. 53,4-6 (1988).
[CrossRef]

T. Shintaku, "Integrated optical isolator based on efficient nonreciprocal radiation mode conversion," Appl. Phys. Lett. 73,1946-1948 (1998).
[CrossRef]

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. (1)

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 (1)

Opt. Commun. (1)

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

Opt. Express (1)

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Figures (6)

Fig. 1.
Fig. 1.

Schematic diagram of MZI configuration of nonreciprocal phase shift isolator.

Fig. 2.
Fig. 2.

Schematic illustration of wavelength dependence of nonreciprocal and reciprocal phase differences and the total phase differences of the MZI isolator. (a), (b) correspond to the conventional design and (c), (d) correspond to the wideband design.

Fig. 3.
Fig. 3.

Calculated operation spectra of the MZI isolator of (a) conventional design, (b) wideband design.

Fig. 4.
Fig. 4.

Optical measurement setup for MZI isolator

Fig. 5.
Fig. 5.

Near field patterns of transmitted light with an ASE light source having an optical gain around λ= 1.55μm. The MZI isolators are fabricated with (a), (b) conventional design and (c), (d) wideband design on a same wafer.

Fig. 6.
Fig. 6.

Measured transmission of the MZI isolator of (a) conventional design and (b) wideband design.

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