Abstract: A bend-insensitive optical cable for transmitting optical signals includes an optical cable having a length, extending from an input end adapted to receive the optical signals, to an output end and including at least one single-mode optical fiber having a cable cut-off wavelength, of 1290 nm to 1650 nm. The at least one optical fiber is helically twisted around a longitudinal axis with a twisting pitch, for a twisted length, extending along at least a portion of the length, of the optical cable, wherein the twisted length and the twisting pitch are selected such that the optical cable exhibits a measured cut-off wavelength equal to or lower than 1260 nm. Preferably, the at least one fiber has a mode-field diameter of 8.6 ?m to 9.5 ?m. According to a preferred embodiment, the optical cable includes two optical fibers twisted together along the longitudinal axis, each of the two optical fibers having a cable cut-off wavelength of 1290 nm to 1650 nm.

Abstract: A bend-insensitive optical cable for transmitting optical signals includes an optical cable having a length, extending from an input end adapted to receive the optical signals, to an output end and including at least one single-mode optical fiber having a cable cut-off wavelength, of 1290 nm to 1650 nm. The at least one optical fiber is helically twisted around a longitudinal axis with a twisting pitch, for a twisted length, extending along at least a portion of the length, of the optical cable, wherein the twisted length and the twisting pitch are selected such that the optical cable exhibits a measured cut-off wavelength equal to or lower than 1260 nm. Preferably, the at least one fiber has a mode-field diameter of 8.6 ?m to 9.5 ?m. According to a preferred embodiment, the optical cable includes two optical fibers twisted together along the longitudinal axis, each of the two optical fibers having a cable cut-off wavelength of 1290 nm to 1650 nm.

Abstract: An optical fiber link has a plurality of optical fiber spans joined one to the other, the plurality of optical fiber spans including at least one first unidirectionally-spun optical fiber span and at least one second unidirectionally-spun optical fiber span having mutually opposite spinning directions.

Abstract: An optical fiber link has a plurality of optical fiber spans joined one to the other, the plurality of optical fiber spans including at least one first unidirectionally-spun optical fiber span and at least one second unidirectionally-spun optical fiber span having mutually opposite spinning directions.

Abstract: A dispersion-managed optical soliton transmission system uses alternating spans of positive-dispersion optical fiber having a negative slope and negative-dispersion optical fiber having a positive slope. For wavelength division multiplexing, the system has a map strength preferably between 4 and 8. An absolute value of average group velocity dispersion between 0.5 and 0.0 ps2/km, and soliton power may vary between channels within 1 dB. Map periods, amplifier spacings, and dispersion values across a wavelength range of 1530–1600 nm are disclosed for bit rates of 10 and 40 Gbits/sec to maintain the ranges of average group velocity dispersion and soliton power.

Abstract: A cleaning element (1) for brooms or brushes comprises a board (2) having a surface (3) for supporting a plurality of clusters or bundles (4) of fibres forming a cleaning body (5); each cluster (4) is provided with a related element (6) for fastening the clusters (4) to the surface (3) and it can be associated to the board (2); the latter has at least an internal cavity (7) for housing the fastening elements (6) in correspondence with their passage through related through holes (8) provided in the support surface (3).

Abstract: A network for distributing signals to a plurality of user having a distribution unit and a plurality of optical cables adapted to make the distribution unit communicate with the plurality of user equipment. In turn, each optical cable has an optical fibre having a core, a cladding and a predetermined simple refractive index profile ?n(r). Each optical fibre is adapted to guarantee a single-mode propagation at higher wavelengths than about 1260 nm and a few-mode propagation at about 850 nm, and each optical fibre has such refractive index profile ?n(r) as to guarantee macro-bending losses at 1550 nm that are less than about 0.5 dB and an intermodal delay ?? at 850 nm that is less than or equal to, about 1 ns/Km.

Abstract: A dispersion-managed optical soliton transmission system uses alternating spans of positive-dispersion optical fiber having a negative slope and negative-dispersion optical fiber having a positive slope. For wavelength division multiplexing, the system has a map strength preferably between 4 and 8. An absolute value of average group velocity dispersion between 0.5 and 0.0 ps2/km, and soliton power may vary between channels within 1 dB. Map periods, amplifier spacings, and dispersion values across a wavelength range of 1530-1600 nm are disclosed for bit rates of 10 and 40 Gbits/sec to maintain the ranges of average group velocity dispersion and soliton power.

Abstract: A cleaning element (1) for brooms or brushes comprises a board (2) having a surface (3) for supporting a plurality of clusters or bundles (4) of fibres forming a cleaning body (5); each cluster (4) is provided with a related element (6) for fastening the clusters (4) to the surface (3) and it can be associated to the board (2); the latter has at least an internal cavity (7) for housing the fastening elements (6) in correspondence with their passage through related through holes (8) provided in the support surface (3.

Abstract: A network for distributing signals to a plurality of user equipment having a distribution unit and a plurality of optical cables adapted to make the distribution unit communicate with the plurality of user equipment. In turn, each optical cable has an optical fibre having a core, a cladding and a predetermined simple refractive index profile &Dgr;n(r). Each optical fibre is adapted to guarantee a single-mode propagation at higher wavelengths than about 1260 nm and a few-mode propagation at about 850 nm, and each optical fibre has such refractive index profile &Dgr;n(r) as to guarantee macro-bending losses at 1550 nm that are less than about 0.5 dB and an intermodal delay &Dgr;&tgr; at 850 nm that is less than or equal to, about 1 ns/Km.

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: Disclosed is a handle for household utensils, in particular for floor cleaning utensils, the external polygonal contour of which presents side faces (6) and edges (7).

Abstract: Wipe cover for floor cleaning, featuring a wipe-material layer having pile threads projecting from this layer in the direction of the surface to be cleaned, and means for securing to a retainer, at least one layer of non-woven fabric being provided, forming edges projecting beyond the wipe-material layer.

Abstract: A versatile broom, brush or similar floor care implement comprises a head anchoring on a first side thereof a multiplicity of bristles presenting a substantially-flat bristle surface, and an integrally-formed connector-mating structure on an opposed second side of the head. The cleaning implement is maneuvered by an elongated handle disposed at a variety of preselected angles. Intermediate the head and handle is a handle interconnector to which the handle is detachably secured at one extremity and a connection assembly is ratchetably-pivotably secured at the other extremity. The connection assembly and the integrally-formed connector-mating structure on the head interact so that the handle can be selectively pivoted in a single plane as much as 180.degree. or more and locked at any of a number of preselected angles relative to the substantially-flat bristle-end surface.

Abstract: A surface-wiping device in which a compressible wiping member made of an absorbent material is mounted on a holder that is connected to a handle. The wiping member is affixed to a convex adhesive surface that surrounds a shaft. An roller is provided for squeezing liquid from the wiping member. This roller is pivotable about a shaft in response to the manipulation of a rod assembly that is attached to the handle.

Abstract: The handle of the broom is canted in relation to its axis of rotation about the broomhead back through a given angle, and connected to the back by way of a hinge the axis of which is inclined through an angle, relative to the longitudinal axis of the back itself. The broom can be used with the handle either upright, or folded down in such a way as to keep the broomhead with the bristles resting upon the surface to be cleaned, without any unwanted tilting or wobbling movement.

Abstract: The handle of the broom is canted in relation to its axis of rotation about the broomhead back through a given angle, and connected to the back by way of a hinge the axis of which is inclined through an angle, relative to the longitudinal axis of the back itself. The broom can be used with the handle either upright, or folded down in such a way as to keep the broomhead with the bristles resting upon the surface to be cleaned, without any unwanted tilting or wobbling movement.