Title :
Semiconductor Waveguide Optical Isolators Towards Larger Optical Isolation Utilizing Nonreciprocal Phase Shift by Ferromagnetic Co
Author :
Shimizu, Hiromasa ; Yoshida, Syunta ; Goto, Syunsuke
Author_Institution :
Dept. of Electr. & Electron. Eng., Tokyo Univ. of Agric. & Technol., Tokyo
Abstract :
We theoretically investigated optical isolation in Co-InGaAsP semiconductor active waveguide optical isolators based on a nonreciprocal phase shift. By appropriate design of the waveguide layer structure and ferromagnetic metal, a large alpha parameter can be obtained, and the optical isolation was estimated to be larger than 30 dB in Mach-Zehnder interferometric waveguide optical isolators. The length of the nonreciprocal phase shifting region is as short as 1.3 mm.
Keywords :
III-V semiconductors; cobalt; ferromagnetic materials; gallium arsenide; gallium compounds; indium compounds; integrated optics; integrated optoelectronics; optical isolators; optical waveguides; Co-InGaAsP; Mach-Zehnder interferometric waveguide optical isolators; alpha parameter; ferromagnetic metal; nonreciprocal phase shift; nonreciprocal phase shifting; semiconductor active waveguide optical isolators; waveguide layer structure; Isolators; Nonlinear optics; Optical devices; Optical feedback; Optical interferometry; Optical refraction; Optical variables control; Optical waveguide theory; Optical waveguides; Semiconductor waveguides; Alpha parameter; Co; InGaAsP; nonreciprocal loss; nonreciprocal phase shift; photonic integrated circuit; semiconductor optical amplifier (SOA); waveguide optical isolator;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2008.928839
