Abstract: A column segment comprising a body having at least one external channel, an upper protrusion extending from a top side of the body, and a lower protrusion extending from a bottom side of the body, wherein the at least one external channel further comprises an outer angled wall arranged to receive a securing means and direct said securing means through the at least one external channel, wherein the upper protrusion includes a domed portion and a plurality of locating slots, wherein the lower protrusion includes a domed recess and a plurality of projections, and wherein a first column segment is stackable with a second column segment by the domed portion and the locating slots of the first column segment matingly engaging with the domed recess and the projections of the second column segment.

Abstract: An improved fiber endface shape for increasing coupling of optical power from a source into fiber and its manufacture are disclosed. The inventive tip comprises a cleaved end surface that is preferably substantially orthogonal to the fiber's axis and a first and second polished, angled surfaces intersecting the end surface. Break-lines between the angled surfaces and the end surface fall near an edge of a cladding-core interface and preferably outside that interface when the fiber and transmitted light are such that a substantial portion of the light is transmitted in the cladding. A spatial intensity profile of light exiting from the tip is detected during manufacture and is used to monitor the polishing of the angled surfaces. Tests have shown that the inventive tip achieves the coupling efficiency associated with the double-angled wedge-shaped fiber tips while maintaining much of the ease of manufacture associated with the single-angle wedge tips.

Abstract: A feedback controlled laser diode communication device is disclosed that, as is common, has a laser diode that is modulated in response to an input signal to generate an optical signal, encoding the input signal. Spatially variable passband filter material, however, is arranged to receive at least a portion of the optical signal generated by the laser diode, preferably from the rear facet, and at least one detector is used to detect the thus filtered optical signal. Control circuitry then controls a wavelength of the laser diode based upon the response of the detector(s) to thus provide feedback control. As such, the device is particularly applicable to maintaining the tight channel spacings found in wavelength division multiplexed systems.