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Integrated optical 4*4 star coupler on LiNbO3

: Heidrich, H.; Hoffmann, D.; Doldissen, W.; Klug, M.

Electronics Letters 20 (1984), No.25-26, pp.1058-9
ISSN: 0013-5194
Journal Article
Fraunhofer HHI ()
integrated optics; lithium compounds; optical communication equipment; optical couplers; optical fibres; optical waveguides; titanium; less than 4.2 db excess loss; low-loss type; passive planar configuration; te mode; single-mode operation; optical communication devices; 4*4 star coupler; x-cut; z-propagation; tm polarised light; linbo3

A novel low-loss passive planar 4*4 star coupler consisting of four interconnected 3 dB couplers was fabricated on X-cut LiNbO3:Ti using Z-propagation. Almost even distribution was achieved for both TE and TM polarised light incident on any of the four inputs. Excess loss including fibre coupling was <4.2 dB.