Unitary trees and stars for subscriber loop applications

Daniel R. Campbell Jr.; David W. Stowe

doi:10.1117/12.134960

1 February 1992 Unitary^® trees and stars for subscriber loop applications

Daniel R. Campbell Jr., David W. Stowe

Proceedings Volume 1578, Fiber Networks for Telephony and CATV; (1992) https://doi.org/10.1117/12.134960
Event: OE Fiber, 1991, Boston, MA, United States

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.

Citation Download Citation

Daniel R. Campbell Jr. and David W. Stowe "Unitary^® trees and stars for subscriber loop applications", Proc. SPIE 1578, Fiber Networks for Telephony and CATV, (1 February 1992); https://doi.org/10.1117/12.134960

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