الفهرس 
Advantage an" ~ " .drawbacks Of WDM Communication SystemsOnly 14 pages are availabe for public view
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Abstract
Wavelength division multiplexing (WDM) is an elegant technique to overcome the huge bandwidth of the current multimedia communication systems for either point-to- point links or networks applications. Tunable optical filters are one of the key elements for WDM communication systems. Different classifications for tunable optical filters have been proposed. Here we classify the tunable optical filters from point of view of its tuning mechanism. Among these filters are the liquid crystal filter which seems to be a promising new filter technology. Different types of LC filter are considered. All of these filters are Fabry-perot filters, its tuning mechanism depends on the electrooptic effect in liquid crystals. The tuning range and the finesse of these filters are accepted and suitable for dense WDM networks, but the speed of these filters (in microsecond range) depends on the response of LC material to the electric field. the effect of pretilt angle and the effect of temperature on the performance of the LC filters are considered.