A reprojection/backprojection technique and apparatus for carrying out such a technique provides a hierarchical solution to speeding-up reprojection and backprojection of tomographic images. In the context of reprojection, a tomographic image is divided into a series of subimages. Each subimage is shifted to the origin, projected at a reduced number of views, and then up-sampled and shifted back (in the sinogram space). The resulting sinograms are then combined to provide a single sinogram. This...

Filling materials are prepared which contain polyoxyalkylenes and surfactants. These filling materials are particularly well-suited for optical waveguides of which the cable and/or core sheaths consist essentially of polyolefin plastics.

An optical wavelength multiplexer/demultiplexer, capable of exhibiting flat spectral response characteristics while minimizing insertion loss, is proposed. The optical wavelength multiplexer/demultiplexer, used in WDM systems, includes a first slab waveguide for dividing powers of input optical signals coupled from the input optical waveguides, an arrayed waveguide grating for guiding the optical signals from the first slab waveguide therethrough in such a fashion that the optical signals have c...

The invention relates to a method for optical fiber use, in which light that is generated by means of a light generating apparatus is being led by exploiting an optical fiber, wherein the light generating apparatus has at least light generating means (1), such as a lamp (1a) and an objective assembly (1b) and/or like to direct light towards the end of the optical fiber (2), for leading of the same further by the optical fiber (2). Particularly for cooling of the input end for light (2a) of the o...

A system and method are introduced to provide a flexible splint for an optical-fiber splice. After splicing the fiber, it is placed within a flexible inner layer. Over the flexible inner layer is placed a flexible outer layer, thereby creating an inner- and outer-layer splint.

Compliant, resilient mounting means are provided for minimizing stresses on the platform of an optical sub-assembly package that tend to be caused by such factors as the mounting of the package base to a rigid, external platform, as by bolting, so as to maintain good alignment between the laser beam emitted from a laser chip mounted on the platform and the lens of an optical fiber also mounted on the platform.

A low cost, high speed WDM optical link which employs a circular array of VCSEL emitters directly coupled to a multi-mode fiber through which multiple simultaneously optical transmissions are sent to an optical detector comprising a circular array of RCPD detectors receiving the multiple simultaneous transmissions. The emitters and detectors within each array are fabricated with a double-absorber design which avoids position sensitivity related to the cavity standing wave and eliminates the need...

A wavelength division multiplex/demultiplexer (WDM) has a plurality of narrow-band zeroth order resonant grating filters (10a-10e) to multiplex or demultiplex multiple wavelengths that have very close channel spacing. In one embodiment, a plurality of these filters (10a14 10e) are assembled in a block (20) in parallel and at an angle to a propagation axis to reflect signals for a plurality of discrete frequency channels. The block spacing material (21) can be liquid or solid. In another embodime...

A nonlinear optical loop mirror is combined with a pulse compressor. The nonlinear loop mirror receives both control pulses and data pulses and further transmits selected data pulses in accordance with relative amounts of overlap between individual control and data pulses. The pulse compressor compresses at least one of the control and data pulses for improving the transmission efficiency of the selected data pulses and reducing crosstalk with the remaining data pulses.

A specification is given of an OWG plug-in system for multimedia devices comprising a first OWG plug connector (1) with a mechanically releasable connector (2) and a mating connector (3), the said OWG plug connector being arranged in proximity to a multimedia device, a second OWG plug connector (101) with an OWG connector (105) and a printed circuit board (102), this second OWG plug connector (101) being arranged in an electromagnetically compatible region of the multimedia device and containing...