Jm. Hammer et al., POLYCRYSTALLINE-METAL-FERROMAGNETIC OPTICAL WAVE-GUIDE ISOLATOR (POWI) FOR MONOLITHIC-INTEGRATION WITH DIODE-LASER DEVICES, IEEE photonics technology letters, 9(5), 1997, pp. 631-633
Optical Faraday rotation in polycrystalline or amorphous thin films of
ferromagnetic materials can be used to obtain true-optical isolators
and nonreciprocal-TE-TM-mode converters which cover a wide wavelength
range, These can be integrated with semiconductor lasers and other int
egrated optic devices because the films do not require epitaxial depos
ition, A detailed description and analysis of an integrable isolator w
ith better than 30-dB isolation ratio and low insertion loss in the 1.
5-mu m wavelength region is given.