Ferroelectric liquid-crystal polarization switching-based high speed multi-wavelength add/drop filters using fiber and array waveguide gratings.
Riza, Nabeel A.
Society of Photo-Optical Instrumentation Engineers (SPIE)
A number of approaches have been used to implement programmable add/drop optical filters for wavelength division multiplexed (WDM) optical communications. These include integrated-optic (10) acousto-optic tunable filters (AOTFs) , all-fiber mechanically tuned fiber Bragg grating (FBG) devices , 10 grating switch with 10 coupler devices , array waveguide grating (AWG) multiplexer with 10 thermo-optic switches , FBG devices with magnetic field tuning , JO Bragg gratings with multi-mode interference couplers , NxN wavelength grating routers and lxN mechanical switches , AWG multiplexer with manually simulated 2X2 switches , free-space diffraction gratings-based filter using a linear array twisted nematic liquid crystal device , 10 electro-optically controlled synthesized grating structure based filter [ 10], and bulk dual AOTF-based structures [ 1 1] .It is highly desirable to have a short reconfiguration time (e.g., 10 is), low optical crosstalk (e.g., -40 dB), low drive power (e.g., tens of mWs), low loss (e.g., 5 dB), add-drop filter. In addition, a low cost modular and scaleable filter design that is easily modifiable and repairable is also desirable. So far, to the best of the author's knowledge, no one filter satisfies all the mentioned requirements. In this paper, we propose three filter architectures based on high speed ferroelectric liquid crystal (FLC) devices, that have the potential to meet the above requirements.
Switches , Polarization , Optical filters , Fiber Bragg gratings , Ferroelectric LCDs , Optical switching , Multiplexers
Riza, N. A. (1998) 'Ferroelectric liquid-crystal polarization switching-based high speed multi-wavelength add/drop filters using fiber and array waveguide gratings', Proceedings of SPIE, 3490, International Optics in Computing, Bruges, Belgium. doi: 10.1117/12.308956
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