An optical fiber system includes an optical fiber light transmission system having a light path therethrough, and a filter module positioned to controllably place light filters into the light path of the optical fiber light transmission system. The filter module includes a movable support on which light filters are mounted, and a drive mechanism operably connected to the movable support to controllably move the at least one light filter into and out of the light path. The drive mechanism is operated to move the light filters into or out of the light path.

 
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> Method for estimating amount of angular disagreement of planes of polarization of polarization-maintaining optical fibers and for connecting polarization-maintaining optical fibers

> Device for adding and dropping optical signals
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