Improved coupling efficiency using /spl Delta/n-controlled polymer waveguides with two-dimensional spot-size transformation

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....

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Bibliographic Details
Published inIEEE photonics technology letters Vol. 12; no. 4; pp. 404 - 406
Main Authors Inaba, R., Kato, M., Akahoshi, H.
Format Journal Article
LanguageEnglish
Published IEEE 01.04.2000
Subjects
Circuits
Electron beams
Electron optics
Optical devices
Optical losses
Optical polymers
Optical propagation
Optical refraction
Optical waveguides
Polyimides
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Summary: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.
ISSN:1041-1135
1941-0174
DOI:10.1109/68.839033