Optical interconnection device

Optical: systems and elements – Holographic system or element – Using a hologram as an optical element

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359 34, 359130, 385 17, 385 31, 385 37, 385 46, G03H 100, H04J 1400, G02B 626

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054692776

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.

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"Theory of an efficient of N.times.N passive star coupler"; M. Tabiani and M. Kavehrad, Journal of Lightwave Technology, vol. LT-9, No. 4, pp. 448-455, Apr. 1991.

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