Browse Prior Art Database

Holographic Coupler Devices for Fiber-Optic Networks

IP.com Disclosure Number: IPCOM000102287D
Original Publication Date: 1990-Nov-01
Included in the Prior Art Database: 2005-Mar-17
Document File: 2 page(s) / 66K

Publishing Venue

IBM

Related People

Huang, KS: AUTHOR [+3]

Abstract

Disclosed is a holographic approach for implementing Nxl (lxN) coupler devices for fiber-optic networks. This design does not require more conventional combinations of many 3 dB couplers. With proper arrangements, such holographic coupler devices may be used to implement MxN star networks. Theoretically the number of input/output fibers with such devices can reach 100-1000.

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Holographic Coupler Devices for Fiber-Optic Networks

       Disclosed is a holographic approach for implementing Nxl
(lxN) coupler devices for fiber-optic networks.  This design does not
require more conventional combinations of many 3 dB couplers.  With
proper arrangements, such holographic coupler devices may be used to
implement MxN star networks. Theoretically the number of input/output
fibers with such devices can reach 100-1000.

      The basic idea is to fabricate a multiplexed hologram for a
beam combiner (Nxl coupler) (Fig. 1(a)) and the other multiplexed
hologram for beam splitter (lxN coupler) (Fig. 1(a)).  These two
multiplexed holograms are primarily identical, except that input
ports of combiner become output ports of splitter, and vice versa.
By combining a holographic beam combiner and a holographic beam
splitter, a holographic star coupler is then achieved (Fig. 1(b)).
The functions of a beam combiner and a beam splitter can be
fabricated in the same hologram also.  This holographic star coupler
can be implemented either in a 2-D planar version with multiplexed
waveguide holograms (Fig. 1(b)) or in a 3-D volume version with
multiplexed bulk hologram.  Depending on particular implementations,
proper imaging devices (e.g., lenses) may be used.

      This holographic coupler device need not necessarily be used at
a central network between system nodes.  It is possible to use it as
a transmitting or receiving coupler at individual nodes. ...