An optical multiaccessor designed for a fiber-optic star-ring LAN

Author

Sasaki, Jun ; Takato, Norio

Author_Institution

NTT Telecommun. Networks Lab., Tokyo, Japan

Volume

10

Issue

2

fYear

1992

fDate

2/1/1992 12:00:00 AM

Firstpage

250

Lastpage

254

Abstract

An optical waveguide-type multiaccessor for physically star and logically ring local area networks (star-ring LANs) has been manufactured. The multiaccessor has sufficient low optical transmission loss to bypass some failure nodes without an optical repeater. As the multiaccessor (eight-node-connection type) features are small size, 5 cm square by 0.5 cm thick, a smaller cable concentrator can be applied. The design method used for the multiaccessor to minimize total optical transmission loss caused by both signal interference loss and bypassing loss when failure nodes are bypassed in the star-ring LAN is described. The experimental results for the 32 Mb/s single-mode fiber-optic star-ring system show that at least three nodes can be continuously bypassed by using the multiaccessor with a coupling ratio of 0.5 and a bypass loss of 3 dB. As a result, highly reliable and inexpensive star-ring LANs can be designed with the multiaccessor

Keywords

local area networks; optical communication equipment; optical links; optical losses; 3 dB; 32 Mbit/s; bypass loss; bypassing loss; cable concentrator; coupling ratio; eight-node-connection; failure nodes; fiber-optic star-ring LAN; local area networks; logically ring; low optical transmission loss; node bypass; optical multiaccessor; signal interference loss; single-mode fiber-optic star-ring system; waveguide-type multiaccessor; Local area networks; Manufacturing; Optical design; Optical fiber LAN; Optical fiber cables; Optical fiber networks; Optical losses; Optical waveguides; Propagation losses; Repeaters;

fLanguage

English

Journal_Title

Lightwave Technology, Journal of

Publisher

ieee

ISSN

0733-8724

Type

jour

DOI

10.1109/50.120557

Filename

120557