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Demonstration of Multi-Casting in a 1 × 9 LCOS Wavelength Selective Switch

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13 Author(s)
Brian Robertson ; Dept. of Eng.,Photonics & Sensors Group, Univ. of Cambridge, Cambridge, UK ; Haining Yang ; Maura M. Redmond ; Neil Collings
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A multi-functional 1 × 9 wavelength selective switch based on liquid crystal on silicon (LCOS) spatial light modulator technology and anamorphic optics was tested at a channel spacing of 100 and 200 GHz, including dynamic data measurements on both single beam deflection and multi-casting to two ports. The multi-casting holograms were optimized using a modified Gerchberg-Saxton routine to design the core hologram, followed by a simulated annealing routine to reduce crosstalk at non-switched ports. The effect of clamping the magnitude of phase changes between neighboring pixels during optimization was investigated, with experimental results for multi-casting to two ports resulting in a signal insertion loss of -7.6 dB normalized to single port deflection, a uniformity of ±0.6%, and a worst case crosstalk of -19.4 dB, which can all be improved further by using a better anti-reflection coating on the LCOS SLM coverplate and other measures.

Published in:

Journal of Lightwave Technology  (Volume:32 ,  Issue: 3 )