Source: http://www.google.com/patents/US7889960?ie=ISO-8859-1&dq=6650327
Timestamp: 2015-05-04 00:57:02
Document Index: 769684071

Matched Legal Cases: ['Application No. 06076957', 'Application No. 07006909', 'Application No. 09006121', 'Application No. 09006117', 'Application No. 06076957', 'Application No. 0603128', 'Application No. 0802503']

Patent US7889960 - Bend-insensitive single-mode optical fiber - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsA single-mode optical fiber includes a central core, an intermediate cladding, a depressed trench, and an external optical cladding. The central core has a radius r1 and a positive refractive index difference Δn1 with the optical cladding. The intermediate cladding has a radius r2 and a refractive index...http://www.google.com/patents/US7889960?utm_source=gb-gplus-sharePatent US7889960 - Bend-insensitive single-mode optical fiberAdvanced Patent SearchPublication numberUS7889960 B2Publication typeGrantApplication numberUS 12/436,484Publication dateFeb 15, 2011Filing dateMay 6, 2009Priority dateMay 6, 2008Fee statusPaidAlso published asCN101576631A, CN101576631B, CN101587204A, CN101587204B, EP2116877A1, EP2116877B1, EP2116878A1, EP2116878B1, US8131125, US8145025, US8428414, US20090279835, US20090279836, US20110135264, US20120183268Publication number12436484, 436484, US 7889960 B2, US 7889960B2, US-B2-7889960, US7889960 B2, US7889960B2InventorsLouis-Anne de Montmorillon, Simon Richard, Denis Molin, David Boivin, Marianne Bigot-Astruc, Pierre SillardOriginal AssigneeDraka Comteq B.V.Export CitationBiBTeX, EndNote, RefManPatent Citations (101), Non-Patent Citations (46), Referenced by (16), Classifications (6), Legal Events (4) External Links: USPTO, USPTO Assignment, EspacenetBend-insensitive single-mode optical fiber
US 7889960 B2Abstract
This application claims the benefit of pending French Application Ser. No. 08/02503 for �Fibre Optique Monomode� (filed May 6, 2008, at the French Patent Office), which is hereby incorporated by reference in its entirety.
For optical fibers, the refractive index profile is generally set forth in terms of the difference in value between two points on the graph of the function associating the refractive index with the radius of the fiber. Conventionally, the distance r to the center of the fiber is shown along the x-axis of the profile. The difference between the refractive index at distance r and the refractive index of the external fiber cladding is shown along the y-axis (FIG. 2, references 21-24). The external cladding functions as an optical cladding and has a substantially constant refractive index. This optical cladding is generally composed of pure silica but can also contain one or more dopants. The optical fiber refractive index profile is referred to as a �step� profile, a �trapezoidal� profile, or a �triangular� profile for graphs having the respective shapes of a step, a trapezoid, or a triangle. These curves are generally representative of the theoretical or reference index profile (i.e., set profile) of the fiber. Fiber manufacturing constraints may lead to a slightly different profile in the actual fiber.
As depicted in FIG. 1, the optical fiber (10) of the invention has a central core (11), an intermediate cladding (12), and a depressed cladding (13). For purposes herein and without limiting the scope of the invention, depressed cladding means a radial portion of the fiber (10) having a refractive index less than the refractive index of the external optical cladding (14). Typically, the central core (11), the intermediate cladding (12), and the depressed cladding (13) are obtained by chemical vapor deposition in a silica tube. The external optical cladding (14) includes the silica tube and the overcladding on the tube. In exemplary embodiments, the overcladding is generally natural or doped silica, but can also be obtained by any other deposition technique (e.g., vapor axial deposition (�VAD�) or outside vapor deposition (�OVD�)).
Similarly, it is possible to define three volume integrals for the optical fiber (10) of the invention, representative of the volume of the core V11, the volume of the intermediate cladding V12, and the volume of the depressed trench V13. The expression �volume� should not be understood geometrically but rather as corresponding to a value taking three dimensions into account. These three volume integrals can be expressed as follows:
Unless otherwise noted, the examples presented in the following Tables I-IV are predictive simulations. In this regard, Table I (below) shows nine prophetic examples of fiber profiles according to exemplary embodiments of the invention in comparison with three SSMF fiber profiles and one fiber profile corresponding to the G.657A and G.657B recommendations (noted as �BIF� for Bend Insensitive Fiber), as well as 13 prophetic comparative examples. Draka Comteq markets bend-insensitive optical fibers having good resistance to bending losses under the trade name BendBright�. The values in the tables correspond to the set profiles for each fiber.
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