Title :
Laser-trimming adjustment of waveguide birefringence in optical FDM components
Author :
Sugita, Akio ; Jinguji, Kaname ; Takato, Norio ; Kawachi, Masao
Author_Institution :
NTT Opto-Electron. Lab., Ibaraki, Japan
fDate :
8/1/1990 12:00:00 AM
Abstract :
Laser trimming of amorphous-silicon stress-applying films deposited on silica-based single-mode waveguides is demonstrated for controlling waveguide birefringence. Successful applications to polarization-insensitive operation of an optical ring resonator and a Mach-Zehnder interferometer are presented. A phase difference of less than π/100 between TE and TM modes has been attained. It is noted that this laser trimming method can also be applicable to other material devices such as LiNbO3 and yttrium-aluminum-garnet (YAG), where waveguide birefringence control is a crucial factor in achieving the practical performance of the device
Keywords :
birefringence; frequency division multiplexing; laser beam machining; optical communication equipment; optical waveguides; LiNbO3; Mach-Zehnder interferometer; Si; SiO2; TE modes; TM modes; YAG; YAl5O12; laser trimming; optical FDM components; optical ring resonator; phase difference; silica-based single-mode waveguides; stress-applying films; waveguide birefringence control; Birefringence; Laser modes; Optical control; Optical films; Optical interferometry; Optical ring resonators; Optical waveguides; Ring lasers; Stress control; Waveguide lasers;
Journal_Title :
Selected Areas in Communications, IEEE Journal on
