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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).