Network for distribution of signal to multiple user's equipments
A technology for signal distribution and user equipment, applied in the directions of star electromagnetic network, electromagnetic network arrangement, multiplex communication, etc., can solve the problems of expensive, difficult to manufacture optical fiber, unsuitable for optical fiber distribution network, etc., and achieve easy manufacturing , the effect of low production cost
Inactive Publication Date: 2005-08-17
普里斯米恩(LUX)II公司
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[0026] However, the applicant notes that, in practice, the optical fiber disclosed by US patent 4 877 304 is very difficult and expensive to manufacture
Therefore, it is not suitable for use in optical fiber distribution networks where the price factor is very important,
Method used
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[0120] Fig. 9 shows an embodiment of an optical fiber 10 according to the present invention, the optical fiber 10 comprising an inner region 14, called the core, into which optical signals are transmitted, and an outer annular region 12, called the cladding. The cladding 12 has a lower refractive index than the core 14 in order to confine the transmitted signal in the latter.
[0121] Typically, the core 14 and cladding 12 are made of a silicon-based glass material and are obtained by incorporating suitable additives (dopants) into the glass base material of the core 14 and / or cladding 12. The refractive index difference between the cladding layer 12.
[0122] According to the radial distribution of the dopant entering the core 14 and the cladding 12 of the optical fiber 10, a certain refractive index distribution Δn(r) is obtained, where Δn(r) is defined as the distance from the longitudinal axis xx of the optical fiber 10 The refractive index difference between the core 14 ...
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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 Deltan(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 Deltan(r) as to guarantee macro-bending losses at 1550 nm that are less than about 0.5 dB and an intermodal delay Deltatau at 850 nm that is less than or equal to, about 1 ns / Km.
Description
technical field [0001] The invention relates to a signal distribution network from a common branch point to a plurality of user equipments, the network comprising a distribution unit and a plurality of optical cables. Background technique [0002] The invention also relates to an optical cable, and to an optical fiber suitable for use in a signal distribution network. [0003] Currently, in the field of telecommunications, optical technology is mainly used for long-distance transmission using the known properties of the broadband provided by optical fibres. In contrast, the most common techniques used to distribute signals to multiple users (like, for example, television and / or analog and / or digital telephone signals) and to connect electronic devices (like, for example, personal computers in a LAN network) utilize cables, Like for example a coaxial cable or a cable comprising copper wire pairs. [0004] However, cables have narrow frequency bands, and they are becoming a ...
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IPC IPC(8): G02B6/028G02BG02B6/02G02B6/255G02B6/34H04B10/25H04B10/27H04B10/272H04B10/278H04B10/524H04B10/54H04B10/572H04J14/00H04J14/02
CPCG02B6/29377G02B6/2552G02B6/0281G02B6/02266G02B6/03611G02B6/02276G02B6/0288
Inventor 盖杜·奥里佛蒂弗兰西斯科·I·佛马里克吉尔科默·罗巴戴维德·萨奇弗兰西斯科·萨托刊
Owner 普里斯米恩(LUX)II公司