Photopatterned Polymer Multimode 88 Star Couplers: Comparative Design Methodologies and Device Measurements

Igor ILIC
Robert SCARMOZZINO
Richard M. OSGOOD, Jr
James T.YARDLEY
Karl W. BEESON
Michael J. McFARLAND
Kelly M. T. STENGEL

Publication
IEICE TRANSACTIONS on Communications   Vol.E80-B       pp.135-144
Publication Date: 1997/01/25
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: Category: Communication Cable and Wave Guides
Keyword: 
star coupler,  polymer,  multimode,  beam propagation,  ray tracing,  

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Summary: 
The design, fabrication, and testing of a highly multimode polymeric 88 star coupler is described. The design process allowed a comparison to be made of ray tracing and beam propagation methods for the design of such highly multimode waveguide devices. The results obtained with either of these two different methods agree well with actual measurements on a fabricated 88 multimode-input star coupler with a refractive index difference of Δn=0.0274 and a device length of L=4.25 cm. The reduction in the rms power fluctuation in the output guides with the choice of a higher refractive index difference is demonstrated.