Pirelli Cavi E Sistemi S.p.a.

Prysmian Cavi E Sistemi Energia S.r.l.

Prysmian S.p.a.

Pirelli & C. S. P. A.

Pirelli S.p.a.

Francesco Sartori

Giacomo Stefano Roba

Davide Sarchi

Bartolomeo Italo Tirloni

Enrico Maria Consonni

Marco Ruzzier

Martino Travagnin

Alexis Debut

Daniele Cuomo

Guidö Oliveti

Francesco Ivan Pomarico

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 &#x3bc;m to 9.5 &#x3bc;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.

Bend-insensitive optical cable

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.

Low polarisation mode dispersion (PMD) optical fiber link, and method of making the same

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 ps/km, and soliton power may vary between channels within 1 dB. Map periods, amplifier spacings, and dispersion values across a wavelength range of 1530&#x2013;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.

Dispersion-managed optical soliton transmission system

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.

Optical fiber having low non-linearity for WDM transmission

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 &#x394;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 &#x394;n(r) as to guarantee macro-bending losses at 1550 nm that are less than about 0.5 dB and an intermodal delay &#x394;&#x3c4; at 850 nm that is less than or equal to, about 1 ns/Km.

Network for distributing signals to a plurality of user equipment

Growing community of inventors

Milan, Italy

Francesco Sartori