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Optical Engineering

Reduction of coupling loss in many-to-many collimating system for optomechanical matrix systems
Author(s): WeiSheng Hu; QingJi Zeng
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Paper Abstract

In a many-to-many collimating system using gradient-index- rod lenses (GRINs) for an optomechanical matrix switch, there are multiple cross-connections having different optical path lengths so that excess coupling losses arise. The total coupling loss is greatly reduced by properly choosing the GRIN lengths. Two schemes can do so. In the equal ?Z scheme, all GRINs have the same excess length ?Z0 than the quarter pitch, which is optimized at 13, 25, and 49 µm for the three focusing parameters of 0.237, 0.326, and 0.417 mm-1, respectively. The total coupling loss is further reduced in the unequal ?Z scheme, in which the ?Zµ of each GRIN is independently determined and optimized by numerical computation. The results are preferred rather than the zero ?Z scheme where just quarter-pitch GRINs are used.

Paper Details

Date Published: 1 June 1998
PDF: 4 pages
Opt. Eng. 37(6) doi: 10.1117/1.601848
Published in: Optical Engineering Volume 37, Issue 6
Show Author Affiliations
WeiSheng Hu, Shanghai Jiao Tong Univ. (China)
QingJi Zeng, Shanghai Jiao Tong Univ. (China)


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