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Efficient N×N star couplers using Fourier optics

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1 Author(s)
Dragone, C. ; AT&T Bell Labs., Holmdel, NJ, USA

A technique for constructing an efficient N×N star coupler with large N at optical frequencies is described. The coupler is realized in free space using two arrays, each connected to N single-mode fibers. The highest efficiencies are obtained using a planar arrangement of two linear arrays separated by a dielectric slab serving as free-space region. The coupler is suitable for mass production in integrated form, with efficiencies exceeding 35%

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Lightwave Technology, Journal of  (Volume:7 ,  Issue: 3 )