Dispersion Enhancement and Linearization in a Dynamic DWDM Channel Blocker

Zhang-Di Huang, Su-Shan Li, Fei Xu, Xiao Liang, Xing-Jun Wang, Yan-Qing Lu
2010 Journal of Lightwave Technology  
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
more » ... 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 2 GHz, which means our dispersion control technology works very well for grating-based DWDM devices.
doi:10.1109/jlt.2009.2037248 fatcat:zona6y32sbadtl6ejvvji4wmyy