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Liquid crystal variable optical attenuators integrated on planar lightwave circuits

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3 Author(s)
Hirabayashi, K. ; NTT Photonics Labs., Kanagawa, Japan ; Wada, M. ; Amano, Chikara

Variable optical attenuators using polymer-network liquid crystal have been integrated with the pitch of 250 /spl mu/m on planar lightwave circuits. Trenches are cut in the direction perpendicular to the parallel light waveguides into planar lightwave circuits, a transparent electrode is deposited inside the trenches, and the trenches are filled with polymer-network liquid crystal. The typical attenuation range is 18 dB when the driving voltage is <20 Vrms at 1.55-/spl mu/m wavelength. The power consumption is estimated to be very low (200 nW/ch).

Published in:

Photonics Technology Letters, IEEE  (Volume:13 ,  Issue: 6 )

Date of Publication:

June 2001

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