Abstract: An optical fiber interleaver and method for aligning the output channels to a set of nominal values in frequency space. The interleaver is formed of two optical fibers joined together at fused input and output couplers to define an input section, an interferometer section and an output section. Within the interferometer section, an element is arranged to vary the optical path length of at least one of the fibers in response to a feedback signal. The feedback signal is generated by examination of the intensity of a monitor signal at the output section that was applied at the input section.

Abstract: An optical switch includes a reflective element that may be moved into and out of the path of an input light beam without rotation about a hinge. The switch includes a right angle prism whose hypotenuse is an angularly-fixed reflective surface. The prism is fixed to a base platform that is pivotal about an underlying pivot member. A switchable electromechanical relay is energizable for selectively rotating the platform about the pivot member to move the prism in and out of the path of the input beam. A collimator fixed to the output face of the prism assures proper registration of the output with a beam when reflected.

Abstract: An optical interleaver. The interleaver is based upon the Mach Zender interferometer. At least one of the optical paths joining opposed couplers of the arrangement includes an optical image transfer element intermediate the ends of fibers associated with the couplers. In one embodiment, the optical image transfer element is a single imaging lens whereas, in another embodiment, the element consists of an aligned pair of collimating lenses. During fabrication, optical positioning stages support the optical image transfer element and fiber ends to permit ready adjustment of &Dgr;&THgr;, the optical path length difference between the arms of the interleaver, to assure predetermined optical channel spacing of an input DWDM signal.