摘要:
Telecommunication cable comprising at least one microstructured optical fibre comprising a core region and a cladding region surrounding the core region, the cladding region comprising an annular void-containing region comprised of randomly arranged voids, the core region including doped silica to provide a positive refractive index relative to pure silica; and at least one protecting layer provided around said optical fibre, the protecting layer being made of a polymeric material having a low ultimate elongation.
摘要:
Telecommunication cable comprising at least one microstructured optical fiber comprising a core region and a cladding region surrounding the core region, the cladding region comprising an annular void-containing region comprised of randomly arranged voids, the core region including doped silica to provide a positive refractive index relative to pure silica; and at least one protecting layer provided around said optical fiber, the protecting layer being made of a polymeric material having a low ultimate elongation.
摘要:
A manufacturing process of a microstructured optical fibre including a void-containing region, includes the steps of: drawing a microstructured optical fibre along a longitudinal direction from a heated preform, wherein the optical fibre is continuously advanced along the longitudinal direction; directing a radiation beam at a longitudinal position in the longitudinal direction of the optical fibre so as to produce an interference pattern; detecting the interference pattern and producing at least one electrical detection signal corresponding to the interference pattern and including a plurality of signal fringe cycles; feeding the first detection signal into a first counter circuit; determining a first number of interference fringe increments in the plurality of signal wave fringe cycles of the at least one detection signal by using the first counter circuit; determining the outer diameter of the optical fibre, and controlling the microstructure of the optical fibre during advancement of the optical fibre. The step of controlling includes at least one step selected from: (a) controlling the first number of interference fringe increments within a reference number range of reference numbers of interference fringe increments, and (b) calculating a microstructure length value.
摘要:
A single-mode optical fibre for transmitting optical signals includes a central core region for guiding the optical signals, and a cladding region surrounding the core region and including a void-containing annular layer containing randomly distributed voids, wherein the void-containing layer is doped with fluorine at a concentration of less than 1 wt % and has a radial thickness equal to or smaller than 3 μm.
摘要:
A single-mode optical fiber for transmitting optical signals includes a central core region for guiding the optical signals, and a cladding region surrounding the core region and including a void-containing annular layer containing randomly distributed voids, wherein the void-containing layer is doped with fluorine at a concentration of less than 1 wt % and has a radial thickness equal to or smaller than 3 μm.
摘要:
A manufacturing process of a microstructured optical fiber including a void-containing region, includes the steps of: drawing a microstructured optical fiber along a longitudinal direction from a heated preform, wherein the optical fiber is continuously advanced along the longitudinal direction; directing a radiation beam at a longitudinal position in the longitudinal direction of the optical fiber so as to produce an interference pattern; detecting the interference pattern and producing at least one electrical detection signal corresponding to the interference pattern and including a plurality of signal fringe cycles; feeding the first detection signal into a first counter circuit; determining a first number of interference fringe increments in the plurality of signal wave fringe cycles of the at least one detection signal by using the first counter circuit; determining the outer diameter of the optical fiber, and controlling the microstructure of the optical fiber during advancement of the optical fiber. The step of controlling includes at least one step selected from: (a) controlling the first number of interference fringe increments within a reference number range of reference numbers of interference fringe increments, and (b) calculating a microstructure length value.
摘要:
A method and a system based on the method imparts to an optical fiber a predetermined rotation about its axis, wherein the fiber is rotated by way of a frictional force acting on the fiber while it is advanced in a predetermined direction. The rotation actually imparted to the optical fiber is measured on-line while the fiber is advancing in the direction and the frictional force is controlled responsively to the measured rotation so as to obtain the predetermined rotation. Spinning devices acting on the optical fiber by way of an externally controllable frictional force and particularly suitable to be used with the method are disclosed.
摘要:
An apparatus and method for chemical deposition on a rod member having a support structure for supporting the rod member substantially coaxial to a deposition axis; a burner for depositing chemical substances on the rod member; and a rotation device for imparting a rotation motion to the rod member. The rotation device has a joint member of a type suitable to transmit torque between two misaligned members, for example, a double universal joint or a flexible joint, positioned between a motor and a rod gripping member.
摘要:
An apparatus and method for chemical deposition on a rod member having a support structure for supporting the rod member substantially coaxial to a deposition axis; a burner for depositing chemical substances on the rod member; and a rotation device for imparting a rotation motion to the rod member. The rotation device has a joint member of a type suitable to transmit torque between two misaligned members, for example, a double universal joint or a flexible joint, positioned between a motor and a rod gripping member.
摘要:
A process for manufacturing an optical fiber includes: drawing an optical waveguide from a glass preform; applying a layer of a first coating material on the optical waveguide; curing the first coating layer material to obtain a first coating layer; applying a layer of a second coating material onto the first coating layer; applying a layer of colored coating material onto the second coating layer; curing the second coating material and the colored coating material in a single step to obtain a second coating layer superposed on the first coating layer and a colored coating layer superposed on the second coating material layer, the obtained second coating layer having an elastic modulus higher than that of the first coating layer and lower than that of the colored coating layer. An optical fiber and an apparatus for producing it are also provided.