Abstract
A dynamic dense-wavelength-division-multiplexing (DWDM) channel blocker
and equalizer is developed based on liquid crystal (LC) and dispersion
control technology. A multipixel LC array is adopted to regulate the
power level of each DWDM channel, while a reflective grating diffracts the
input signals spatially to corresponding LC pixels. A dispersion control unit is
proposed and employed to enhance the dispersion and compensate the intrinsic
nonlinear dispersion of the grating. Therefore, all LC pixels could handle corresponding
lights centered at the International Telecommunications Union Grids. A
40-channel, 100-GHz channel-spacing dynamic wavelength blocker/equalizer is
thus demonstrated with ${-}5$ dB insertion loss and over 40 dB extinction ratio. The maximum
center frequency shift of all 40 channels is ${\sim}{\pm}2$ GHz, which means our dispersion control technology works very
well for grating-based DWDM devices.
© 2010 IEEE
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