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Proceedings Paper

Unitary trees and stars for subscriber loop applications
Author(s): Daniel R. Campbell; David W. Stowe
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Paper Abstract

As fiber is becoming more prevalent in subscriber loop applications, telephony passive optical networks (TPON) and broadband passive optical networks (BPON) have been proposed using 1 X N trees. In the past, these 1 X N trees have been formed using standard 1 X 2 couplers that are spliced together. The resulting tree had fairly high excess loss due to the splicing together of couplers, a large package size (typically 152 mm X 108 mm X 12.7 mm), and a higher probability of failure, with N-1 possible failure points for each 1 X N tree. Aster has produced a single fused, UnitaryTM fiber optic coupler that exhibits a typical excess loss of less than 0.3 dB, a dramatic decrease in size (69 mm X 3 mm cylindrical tube), and improved reliability, with only one possible failure point per tree. The UnitaryTM coupler is available in any configuration, from 1 X 3 to 1 X 7. We report on the optical performance of these devices, typical excess losses, maximum insertion losses, typical uniformities and discuss their manufacturability. Preliminary results of environmental testing are discussed.

Paper Details

Date Published: 1 February 1992
PDF: 7 pages
Proc. SPIE 1578, Fiber Networks for Telephony and CATV, (1 February 1992); doi: 10.1117/12.134960
Show Author Affiliations
Daniel R. Campbell, Aster Corp. (United States)
David W. Stowe, Aster Corp. (United States)

Published in SPIE Proceedings Vol. 1578:
Fiber Networks for Telephony and CATV

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