Abstract: An exemplary fuel cell device assembly is a fuel cell stack assembly comprising: (i) a plurality of fuel cell packets, each of the packets comprising (a) a frame and (b) two planar electrolyte-supported fuel cell arrays, the fuel cell arrays arranged such that anode side of one fuel cell array faces the anode side of another fuel cell array, and the frame in combination with the fuel cell arrays defines a fuel chamber; (ii) a main enclosure enclosing the plurality of fuel cell packets, such that the plurality of packets form a plurality of oxidant channels; (iii) a restrictor plate forming, in conjunction with the fuel cell pockets, a plurality of oxidant channels; (iv) an inlet oxidant plenum manifold connected to one side of the oxidant channels; (v) an outlet oxidant plenum manifold connected to the other side of the oxidant channels; (vi) an inlet fuel manifold connected to one side of each of the fuel chambers; and (vii) an outlet fuel manifold connected to the other side of each of the fuel chambers.

Abstract: A low slope dispersion shifted optical waveguide fiber having an effective area of less than about 60 ?m2 at a wavelength of about 1550 nm, a zero-dispersion wavelength of less than about 1430 nm, a dispersion of between about 4 ps/nm/km and about 10 ps/nm/km at a wavelength of about 1550 nm, a dispersion slope of less than 0.045 ps/nm2/km at a wavelength of about 1550 nm, and a cabled cutoff wavelength of less than about 1260 nm.

Abstract: Disclosed is a single mode optical waveguide fiber having a low cut off wavelength, and mode field diameter and bend resistance similar to step index single mode optical waveguide fiber designed for use at 1310 nm. By including a clad region of raised refractive index spaced apart from the core region of the single mode optical waveguide fiber, the cut off wavelength can be reduced to 850 nm. The single mode optical waveguide fiber in accord with the invention may also have a core region having a reduced refractive index on centerline surrounded by a region of higher refractive index and a clad region which is substantially uniform. The single mode optical waveguide fiber is thus ideally suited for use with the low cost, reliable VCSEL operating at 850 nm, a Fabry-Perot laser operating at 1310 nm, or a distributed feedback laser operating at 1550 nm thereby enabling low cost, easily installed, home access portions of the broadband telecommunications system.

Abstract: Disclosed is an optical waveguide fiber that simultaneously exhibits large effective area and good resistance to bend induced attenuation, as measured by any of the tests known in the art. The cut off wavelength is controlled to allow single mode operation over a wavelength range that extends from about 1340 nm to 1650 nm. The optical waveguide fiber refractive index profile is simple in design allowing cost effective manufacture.

Abstract: An optical waveguide fiber that simultaneously exhibits large effective area and good resistance to bend induced attenuation, as measured by any of the tests known in the art. The cut off wavelength is controlled to allow single mode operation over a wavelength range that extends from about 1340 nm to 1650 nm. The optical waveguide fiber refractive index profile is simple in design allowing cost effective manufacture.

Abstract: A dispersion flattened non-zero dispersion shifted optical waveguide fiber which includes a central core region surrounded by an outer cladding region, the central core region having an alpha less than 4. The optical fiber has a dispersion at a wavelength of about 1550 nm of between about 4 ps/nm/km and about 8 ps/nm/km, and a dispersion slope of less than 0.025 ps/nm2/km at every wavelength between about 1525 nm and 1650 nm.

Abstract: The present invention provides devices and methods for Raman amplification and dispersion compensation.

Abstract: A low slope dispersion shifted optical waveguide fiber having an effective area of less than about 60 &mgr;m2 at a wavelength of about 1550 nm, a zero-dispersion wavelength of less than about 1430 nm, a dispersion of between about 4 ps/nm/km and about 10 ps/nm/km at a wavelength of about 1550 nm, a dispersion slope of less than 0.045 ps/nm2/km at a wavelength of about 1550 nm, and a cabled cutoff wavelength of less than about 1260 nm.

Abstract: Disclosed is a single mode optical waveguide fiber having a low cut off wavelength, and mode field diameter and bend resistance similar to step index single mode optical waveguide fiber designed for use at 1310 nm. By including a clad region of raised refractive index spaced apart from the core region of the single mode optical waveguide fiber, the cut off wavelength can be reduced to 850 nm. The single mode optical waveguide fiber in accord with the invention may also have a core region having a reduced refractive index on centerline surrounded by a region of higher refractive index and a clad region which is substantially uniform. The single mode optical waveguide fiber is thus ideally suited for use with the low cost, reliable VCSEL operating at 850 nm, a Fabry-Perot laser operating at 1310 nm, or a distributed feedback laser operating at 1550 nm thereby enabling low cost, easily installed, home access portions of the broadband telecommunications system.