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Current optical telecommunication systems employ dense wavelength division multiplexing (WDM) techniques to increase the data carrying capacity of fiber networks. Dynamic add/drop and filtering processes are crucial for the precise control of individual channels on these networks. Reconfigurable integrated optical devices, such as planar Bragg gratings, can tune the reflection wavelength over several...
Direct-UV-written liquid crystal tunable planar Bragg gratings exhibit complex wavelength tuning with threshold points and hysteresis. We discuss the role of disclinations in the liquid crystal and whether they may allow faster wavelength tuning.
We report our recent developments in micro-structured evanescent devices. Micro-machining prior to direct UV writing of channel waveguides provides additional flexibility to fabricate evanescent interacting devices such as modulators and sensors, which allow adiabatic operation.
This study demonstrates Bragg wavelength tuning, with maximum tunability of 114 GHz at 1561.8 nm using patterned ITO glass electrodes with 170 Vpp voltage at 1 kHz. The development of a cascaded architecture of such integrated liquid crystal devices operating at different Bragg wavelengths could pave the way towards true colorless add/drop modules for dynamic dense optical networks.
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