14 December 1989 Nonreciprocal Devices For Integrated Optics
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Proceedings Volume 1126, Electro-Optic and Magneto-Optic Materials and Applications; (1989) https://doi.org/10.1117/12.961381
Event: 1989 International Congress on Optical Science and Engineering, 1989, Paris, France
Recent development of waveguide nonreciprocal devices, i.e. , isolator and circulator, is reviewed. Two major difficulties exist for their fabrication. First, form birefringence must be overcome to obtain high TE-TM mode conversion efficiency. Secondly, both of input and output light must be either TE or TM mode. A variety of methods and device structures have been proposed to solve these difficulties. However, experimental demonstration of waveguide isolator has been limited. After a brief discussion on advantages and drawbacks of proposed methods and device structures, a new fabrication process of waveguide isolator is described. A device structure which ensures TE mode operation was achieved by making adjoining nonreciprocal and reciprocal mode converters by using laser annealing technique. Faraday and Cotton-Mouton effects of Bi-substituted iron garnet film were used for nonreciprocal and reciprocal mode converters, respectively. Growth-induced and stress-induced birefringences of the film were used to cancel the form birefringence. An isolation ratio of 12.5dB was achieved at wavelength of 1.15μm with external magnetic field of 100 Gauss.
© (1989) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Koji Ando, "Nonreciprocal Devices For Integrated Optics", Proc. SPIE 1126, Electro-Optic and Magneto-Optic Materials and Applications, (14 December 1989); doi: 10.1117/12.961381; https://doi.org/10.1117/12.961381

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