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All
Products for US Patent 5469277 - Optical interconnection
device
Inventor(s): Kavehrad; Mohsen (Cumberland,CA),
Yun; Gang (Ottawa,CA)
Owner:
University of Ottawa (Ottawa,CA)
Filing
Date: February 7, 1992
Issue
Date: November 21, 1995
Abstract: In N.times.N optical couplers, such as
are used in local area networks and backplanes of telecommunications
and computer equipment, which use BRAGG volume diffraction means to
couple light beams between the inputs and outputs, the number of
gratings is reduced by means of so-called "grating degeneration" one
grating can be shared by at least two wave pairs at the same time.
In order to achieve this reduction, the directions of light waves in
the dielectric slab (or the lateral positions of fibre ends) are
suitable arranged. In other embodiments, a reduced number of
gratings is achieved by using a "sandwiched" structure which uses
multi-layered dielectric slabs. Both embodiments may be combined in
the one coupler. | 
