New Directional Coupler And Connecting Device For Fiber Optic Local Area Networks

P. A. Bulteel; J. Tillemans

doi:10.1117/12.942780

1 August 1984 New Directional Coupler And Connecting Device For Fiber Optic Local Area Networks

P. A. Bulteel, J. Tillemans

Proceedings Volume 0479, Fiber Optic Couplers, Connectors, and Splice Technology; (1984) https://doi.org/10.1117/12.942780
Event: 1984 Technical Symposium East, 1984, Arlington, United States

Abstract

A new directional coupler and fiber optic connecting device are presented. Both components combine high performance with low cost. The devices are designed for standard low loss 200 micron plastic clad silica (PCS) fiber. The paper describes the design of a new connecting device (LANsplice) which features low loss, small dimensions, ease of installation, visible connection and inspectability of insertion loss after assembly. Mean insertion loss is 0.3 dB, and the device can be remated many times. By using index matching gel, Fresnel reflections are strongly suppressed. The influence of connection loss on reflected power is discussed, and the results of environmental tests (temperature, humidity and shock) are presented. The fiber optic directional coupler (LANtap) features mean excess loss of 0.24 dB for 1:1 couplers and 0.15 dB for 3:1 and 10:1 couplers. The mode selectivity of fused couplers is sometimes indicated as a drawback, however better understanding of this effect leads to a simple rule of thumb to overcome this in local area networks. Measurement results on a bi-directional link on a single fiber and on a fail-safe LAN with passive optical bypass are discussed. It is shown that both designs are quite insensitive to variations of coupler parameters and to the mode selectivity of this coupler. Results of environmental tests are presented.

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P. A. Bulteel and J. Tillemans "New Directional Coupler And Connecting Device For Fiber Optic Local Area Networks", Proc. SPIE 0479, Fiber Optic Couplers, Connectors, and Splice Technology, (1 August 1984); https://doi.org/10.1117/12.942780

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KEYWORDS

Local area networks

Fiber optics

Reflectivity

Connectors

Directional couplers

Cladding

Signal attenuation

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