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Proceedings Paper

Characteristics Of Fused Couplers Below Cut-Off
Author(s): T. J. Meyer; V. J. Tekippe
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Paper Abstract

A number of different architectures are being explored for the utilization of optical fiber in the subscriber loop. In addition to reliability and maintainability, cost is a prime consideration since full implementation of fiber in the local loop will not occur until it is economically viable. It is becoming increasingly clear that in order to accommodate a number of ISDN applications, including high definition television (HDTV), singlemode fiber with a singlemode laser at the terminal end will be required. The situation at the subscriber end is quite different, however. The data rates are expected to be low on the return path to allow for POTS ( plain old telephone service) and some data transfer. When this requirement is combined with cost and reliability considerations, the inexpensive lasers developed for the CD (compact disk) market become quite attractive. The biggest disadvantage of this source is that the fiber which is optimized for singlemode operation at 1300nm tends to be multimode in the 800nm band where these lasers operate. Previous papers have considered such effects as modal noise and pulse dispersion when using these lasers with fiber that is singlemode in the 1300nm band.[1] Another consideration is the passive components required to implement such an architecture. Figure 1 shows a typical bidirectional design with full duplex operation on a single fiber. The key component is the 800/1300 wavelength division multiplexer/demultiplexer (WDM). Because of the multimode nature of the fiber in the 800nm band, all fiber approaches to fabricating the WDM, such as the fused beconical taper (FBT) approach, raise new issues which are not encountered, for example, with 1300/1500nm WDM's.[2] In this paper we discuss the effects of the multimode behavior of the fiber on the performance of fused couplers and WDM's.

Paper Details

Date Published:
PDF: 4 pages
Proc. SPIE 0988, Components for Fiber Optic Applications III and Coherent Lightwave Communications, ; doi: 10.1117/12.959730
Show Author Affiliations
T. J. Meyer, Gould Inc . (United States)
V. J. Tekippe, Gould Inc . (United States)


Published in SPIE Proceedings Vol. 0988:
Components for Fiber Optic Applications III and Coherent Lightwave Communications
Paul M. Kopera; Harish R. Sunak, Editor(s)

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