Optical device

Details Optical device Optical device

G - Physics

02

B

G02B 6/28 (2006.01) G02F 2/00 (2006.01) H01P 1/16 (2006.01)

Patent

CA 2096423

An optical device (10) incorporates a rectangular multimode waveguide (14) with an input aperture (22), and two output optical fibres (26 and 28) with respective input apertures (30 and 32). An input light beam (34) of Gaussian transverse intensity profile is focussed to a beam waist (36) at the centre of the aperture (22). The beam phase and waist radius w are arranged such that the light beam (34) excites symmetric modes in the waveguide (14). Modal dispersion along the waveguide (14) produces two electric field intensity maxima of similar magnitude centred on the fibre input apertures (30 and 32). This provides the beamsplit- ter function of division of input radiation into two similar intensity outputs. Devices of the invention may be arranged to divide input beams into more than two output beams. The invention may also provide a light beam combiner.

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