Title :
Optical frequency tuning by laser-irradiation in silica-based March-Zehnder-type multi/demultiplexers
Author :
Hibino, Yoshinori ; Kominato, Toshimi ; Ohmori, Yasuji
Author_Institution :
NTT Opto-Electron. Labs., Ibaraki, Japan
fDate :
7/1/1991 12:00:00 AM
Abstract :
Optical frequency tuning due to photoinduced refractive-index changes is described in Mach-Zehnder interferometer-type frequency division multiplexers (FDMs) which are composed of GeO/sub 2-/silica-based waveguides on Si substrates. A maximum refractive-index change of about 4*10/sup -5/ at 1.3 mu m is obtained at an Ar/sup +/ laser power of 20 W and an irradiation time of 1 h. This leads to frequency tuning of more than half a period in FDM with a free spectral range of 25 GHz. In addition, the annealing effects on the refractive-index change are investigated.<>
Keywords :
annealing; frequency division multiplexing; germanate glasses; light interferometers; multiplexing equipment; optical communication equipment; optical glass; optical waveguides; photorefractive materials; tuning; 1 h; 1.3 micron; 20 W; Ar/sup +/ laser power; FDM; March-Zehnder-type multi/demultiplexers; Si substrates; SiO/sub 2/-GeO/sub 2/ based waveguides; SiO/sub 2/GeO/sub 2/-Si; annealing effects; frequency tuning; interferometer-type frequency division multiplexers; irradiation time; laser-irradiation; optical frequency tuning; photoinduced refractive-index changes; photorefractive effect; Argon; Frequency division multiplexing; Laser tuning; Optical frequency conversion; Optical interferometry; Optical refraction; Optical tuning; Optical waveguides; Waveguide lasers; Waveguide transitions;
Journal_Title :
Photonics Technology Letters, IEEE
