Title :
Low-loss and large-tolerance fiber coupling of high- Delta silica waveguides by local mode-field conversion
Author :
Yanagisawa, Masahiro ; Yamada, Yasufumi ; Kobayashi, Morio
Author_Institution :
NTT Opto-Electron. Lab., Ibaraki, Japan
fDate :
4/1/1993 12:00:00 AM
Abstract :
Small mode-field silica waveguides with a high refractive index difference of 2% that were efficiently coupled to optical fiber using a local mode-field conversion technique are described. The waveguide end was heated locally at 1300 degrees C for 10 h and this had the effect of doubling the mode-field diameter from 5.0 mu m to about 10 mu m with a taper length of 8 mm. It is shown that, as a result, the fiber coupling loss was drastically reduced from 2.4 to 0.1 dB and the alignment tolerance was doubled.<>
Keywords :
integrated optics; optical couplers; optical fibres; optical losses; optical waveguides; refractive index; 0.1 to 2.4 dB; 10 hrs; 1300 degC; 5 to 10 micron; 8 mm; alignment tolerance; fiber coupling loss; heated locally; high refractive index difference; high- Delta silica waveguides; large-tolerance fiber coupling; local mode-field conversion; low-loss fibre coupling; mode-field diameter; taper length; waveguide end; Heat treatment; Large-scale systems; Optical coupling; Optical fiber losses; Optical fiber testing; Optical fibers; Optical waveguides; Programmable control; Silicon compounds; Temperature;
Journal_Title :
Photonics Technology Letters, IEEE
