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Proceedings Paper

4X4 Electro-Optical Matrix Switch For Fiber Optic Networks
Author(s): Richard A. Soref
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Paper Abstract

A new optical switching component for multimode fiber-optic networks has been developed. This voltage-controlled switch is an 8-port device coupled by GRINrod lenses to four input fibers and to four output fibers (graded index, 50-μm core diameter). The matrix switches light from any input to any output, and four simultaneous input-output connections are made. There are 24 such states. Switching is done via controlled reflection from two layers of nematic liquid crystal. This switch is the first multimode, electro-ontic, fiber-optic matrix. Construction is simple and compact, using only four glass prisms and two liquid crystal layers. The matrix architecture is based on a new dual-switching-array concept that provides very low levels of optical crosstalk, more than 53 dB below the optical input level. The 5-ms on/off response time is faster than that of electro--mechanical matrices, although the 40 Vrms addressing voltage is higher. The optical insertion loss had a minimum value of 6 dB and an average value of 15 dB. The latter is due to misalignment of fibers during attachment to the switch, which can be remedied. Because the present switch does not use moving parts, it is quite reliable.

Paper Details

Date Published: 15 October 1982
PDF: 8 pages
Proc. SPIE 0326, Fiber Optics: Technology '82, (15 October 1982); doi: 10.1117/12.933340
Show Author Affiliations
Richard A. Soref, Sperry Research Center (United States)

Published in SPIE Proceedings Vol. 0326:
Fiber Optics: Technology '82
Claire E. Loscoe, Editor(s)

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