Abstract: An optical transmission fiber has a refractive index profile with an area of increased index of refraction at the inner core of the fiber, an annular region positioned radially outward from the inner core with an index of refraction exceeding the index of the inner core, and at least a low dopant content region in a cross-sectional region between the inner core and the annular region. A low loss cladding layer surrounds the core region. The optical transmission fiber with this segmented core profile provides a high effective area, low non-linearity coefficient, nonzero dispersion, and relatively flat dispersion slope.

Abstract: A graphics subsystem including a RAMDAC for connection to a graphics bus implemented on an integrated circuit chip separate from a graphics processor. In one embodiment, the graphics processor is configured to render digital image information in response to graphics commands and to store the digital image information in a memory. The RAMDAC IC includes a conversion unit, which includes a color mapping unit and a digital-to-analog converter and is configured to convert a representation of the digital image information into one or more analog signals for driving a video display. The graphics subsystem further includes a Direct Memory Access (DMA) controller implemented on the second integrated circuit chip. The DMA controller is configured to generate read requests to retrieve the digital image information stored in the memory to thereby cause the digital image information to be provided to the conversion unit.

Abstract: An optical transmission fiber has a refractive index profile with an area of increased index of refraction at the inner core of the fiber, an annular region positioned radially outward from the inner core with an index of refraction exceeding the index of the inner core, and at least a low dopant content region in a cross-sectional region between the inner core and the annular region. A low loss cladding layer surrounds the core region. The optical transmission fiber with this segmented core profile provides a high effective area, low non-linearity coefficient, nonzero dispersion, and relatively flat dispersion slope.

Abstract: An optical transmission fiber has a refractive index profile with an area of increased index of refraction at the inner core of the fiber, an annular region positioned radially outward from the inner core with an index of refraction exceeding the index of the inner core, and at least a low dopant content region in a cross-sectional region between the inner core and the annular region. A low loss cladding layer surrounds the core region. The optical transmission fiber with this segmented core profile provides a high effective area, low non-linearity coefficient, nonzero dispersion, and relatively flat dispersion slope.

Abstract: An optical transmission fiber has a refractive index profile with an area of increased index of refraction at the inner core of the fiber, an annular region positioned radially outward from the inner core with an index of refraction exceeding the index of the inner core, and at least a low dopant content region in a cross-sectional region between the inner core and the annular region. A low loss cladding layer surrounds the core region. The optical transmission fiber with this segmented core profile provides a high effective area, low non-linearity coefficient, nonzero dispersion, and relatively flat dispersion slope.

Abstract: This invention refers to an electronic computer 10 having a reader 21 for the reading of removable magneto-optic media (CD-ROM) 14. The electronic computer 10 allows even non-expert users to playback the CD-ROM media by pressing pushbuttons 48 on a button panel 45 and visualises on a display 47 information concerning the type of CD-ROM inserted in the reader 21 and the functionality selected. The electronic computer 10 is also capable of passing automatically from an operating state of maximum performance to one of reduced performance with a resultant reduction in electrical energy consumption. The electronic computer 10 can also be connected to television sets 12 and to video recorders 13. The computer 10 according to this invention, while possessing the functionality described above, still remains flexible, powerful, and upgradable, which are attributes typical of personal computers.