Abstract
A key functional element for advanced single-mode optical fibre networks is a 2x2 crosspoint switch for routeing optical signals (1). Such a switch would be used to configure an optical system and would not necessarily need to have a fast switching characteristic. An all-fibre device would be attractive because of the low transmission loss and ease of coupling to system fibre, and a basic building block for many fibre-based devices is the polished fibre coupler (2).
© 1987 Optical Society of America
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