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Proceedings Paper

Functions of GRIN lenses and alignments in a thin film DWDM filter
Author(s): Yufeng Li
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Paper Abstract

The functions of gradient-index (GRIN) rod lenses and opto- mechanical alignments in a thin-film dense wavelength- division multiplexing (DWDM) filter module is analyzed analytically and numerically. Two figures of merit are adopted to characterize the performance of the thin film filter: center wavelength (CWL) shift and coupling efficiency (CEF). For a typical 100 GHz filter with four cavities and 143 stacks of films, the angular alignment tolerance is so tight that meaningful product yield will be difficult to achieve. However, with the deployment of GRIN lenses and active alignments, the angular product yield will be difficult to achieve. However, with the deployment of GRIN lenses and active alignments, the angular alignment tolerance is relaxed by two orders of magnitude. The effects of component tolerances and assembly tolerances on coupling efficiency are also analyzed. The results indicate that while the GRIN lens helps in the alignment of a thin- film filter, and sequence of assembly also plays an important role.

Paper Details

Date Published: 13 November 2001
PDF: 9 pages
Proc. SPIE 4437, Gradient Index, Miniature, and Diffractive Optical Systems II, (13 November 2001); doi: 10.1117/12.448146
Show Author Affiliations
Yufeng Li, Scion Photonics (United States)


Published in SPIE Proceedings Vol. 4437:
Gradient Index, Miniature, and Diffractive Optical Systems II
Thomas J. Suleski, Editor(s)

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