Abstract: An optical multiplexing apparatus of a low cost is capable of reliably multiplexing a plurality of optical signals having a narrow wavelength interval, while suppressing the nonlinear optical effect and the crosstalk, and a multiplexing method. The optical multiplexing apparatus includes a first optical multiplexer for multiplexing, among a plurality of optical signals that are input with directions of linear polarization of the neighboring wavelengths being differed to each other, optical signals having odd wavelength numbers while maintaining their polarization states. A second optical multiplexer multiplexes optical signals having even wavelength numbers while maintaining their polarization states, and a third optical multiplexer multiplexes, at an output unit thereof through first and second input units having sharp filtering characteristics, the optical signals multiplexed by the first and second optical multiplexing means, to output WDM signal light.

Abstract: This optical-fiber holder comprises an annular optical-fiber winding framework. The optical-fiber winding framework includes an optical-fiber winding frame portion and a base portion provided as a turning axle of the optical-fiber winding framework. The optical-fiber winding frame portion has an optical-fiber containing groove formed along a periphery thereof. The base portion has an opening penetrating into an interior thereof and communicating with the optical-fiber containing groove at both ends. An optical fiber is wound and held in the interior of the base portion and the optical-fiber containing groove.

Abstract: This optical-fiber holder comprises an annular optical-fiber winding framework. The optical-fiber winding framework includes an optical-fiber winding frame portion and a base portion provided as a turning axle of the optical-fiber winding framework. The optical-fiber winding frame portion has an optical-fiber containing groove formed along a periphery thereof. The base portion has an opening penetrating into an interior thereof and communicating with the optical-fiber containing groove at both ends. An optical fiber is wound and held in the interior of the base portion and the optical-fiber containing groove.