Title :
Improved coupling efficiency using /spl Delta/n-controlled polymer waveguides with two-dimensional spot-size transformation
Author :
Inaba, R. ; Kato, M. ; Akahoshi, H.
Author_Institution :
Res. Lab., Hitachi Ltd., Ibaraki, Japan
fDate :
4/1/2000 12:00:00 AM
Abstract :
A new type of polymer waveguide for two-dimensional spot-size transformation is reported, with which coupling efficiency of waveguides with 4- and 8-μm core diameters was reduced by /spl ap/1.6 dB. The length needed for spot-size transformation was less than 1 mm along the direction of propagation. In this polymer waveguide, refractive index difference between core and cladding (/spl Delta/n) is properly controlled along the direction of propagation while the core cross section is kept uniform.
Keywords :
claddings; optical couplers; optical fabrication; optical losses; optical polymers; refractive index; /spl Delta/n-controlled polymer waveguides; 1 mm; 4 mum; 8 mum; cladding; core; core cross section; core diameters; coupling efficiency; polymer waveguide; propagation direction; refractive index difference; spot-size transformation; two-dimensional spot-size transformation; Circuits; Electron beams; Electron optics; Optical devices; Optical losses; Optical polymers; Optical propagation; Optical refraction; Optical waveguides; Polyimides;
Journal_Title :
Photonics Technology Letters, IEEE
