Abstract
A multimode optical fibre is tapered down to a single mode fibre over 10 to 20 mm. The taper is then sandwiched against a high index prism in the manner of the prism thin-film coupler. Single guided modes can then be launched from a TEM00 mode laser beam impinging on the fibre through the prism at the correct angles of incidence and skew. Modes are selected by adjusting the position of incidence along the taper and the angles. The device can be operated in reverse as a mode selective detector.
© 1975 Optical Society of America
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