摘要:
The present invention provides a plastic optical fiber, which enables the distributions of refractive indices to be adjusted easily, and a method for manufacturing a plastic optical fiber perform. The plastic optical fiber perform includes a substrate having one or more holes, and one or more materials provided in the holes for a refractive index adjustment purpose. The distributions of refractive indices of the optical fiber preform are manipulated by adjusting the arrangement types, distributions, and the number of holes formed in the substrate and refractive indices of the materials used for refractive index adjustment.
摘要:
An apparatus and method for fabricating a plastic optical fiber are disclosed. In the fabricating apparatus, a first container is provided to separately contain the refractive index control materials including at least a core material. The refractive control materials have different refractive indices. A second container contains a clad material having a different refractive index from the core material. A crosshead flows down the refractive index control materials and the clad material introduced from the first and second containers by physical extrusion, while restricting the flow of the refractive index control materials and clad materials to a predetermined radius. A rotator mixes the extruded refractive index control and clad materials concentrically perpendicular to an extrusion direction.
摘要:
A photonic crystal fiber (PCF) preform, from which a photonic crystal fiber is manufactured, includes a rod-shaped substrate with holes longitudinally formed therethrough in a photonic lattice structure, and material layers having at least two different indices of refraction. The material layers are disposed in the holes, respectively. Distribution of index of refraction of the photonic crystal fiber preform is controlled by arrangement of the material layers. Consequently, an optical fiber with very low optical loss, very low optical nonlinearity and excellent transmission characteristics can be easily manufactured, and an optical fiber with various characteristics, differing depending upon the lattice structure, can be realized.
摘要:
The present invention relates to an apparatus for measuring the residual stress in an optical fiber which includes: a fixating unit for fixating an optical fiber with residual stresses to be measured therein; and a measuring unit comprising a light generator for generating a light for measuring the residual stresses in the optical fiber and a detector for detecting phase changes of the light that has been generated by the light generator; wherein the measuring unit measures the residual stresses in the optical fiber based on the phase changes of the light passed through the optical fiber, while the measuring unit is rotating along with the circumference of the optical fiber.
摘要:
A double-coated optical fiber and method includes providing a core that serves as a light transmission medium. A cladding surrounds the core and has a smaller reflective index than the core. A primary coating layer is formed of a UV-cured polymer around the clad, and a secondary coating layer is formed of a UV-cured polymer around the primary coating layer, to a thickness ranging from about 22 to 37.5 μm in order to obtain a coating strip force ranging from about 1.0 to 1.63 N and a dynamic stress corrosion parameter ranging from 20 to 29. The primary and secondary coating layers can be formed by a wet on wet or wet on dry process.
摘要:
A method for drawing an optical fiber is provided in which a plurality of coating layers having a different viscosity is formed on the outer peripheral surface of a first optical fiber drawn from an optical fiber perform, then a second optical fiber with the coating layers formed thereon is drawn in a slanted direction relative to the drawing axis of the first optical fiber to form a third optical fiber incorporating a twist.
摘要:
A method for reducing the hydrogen sensitivity of an optical fiber is disclosed. The method includes a deuterium treatment step of exposing an optical fiber to a gas mixture including a deuterium, so that the optical fiber makes a contact with the deuterium, and a degassing step of degassing the optical fiber treated with the deuterium under a negative pressure condition.
摘要:
A method for reducing the hydrogen sensitivity of an optical fiber is disclosed. The method includes a deuterium treatment step of exposing an optical fiber to a gas mixture including a deuterium, so that the optical fiber makes a contact with the deuterium, and a degassing step of degassing the optical fiber treated with the deuterium under a negative pressure condition.
摘要:
A photonic crystal fiber capable of single-mode transmission and a preform thereof are disclosed. The photonic crystal fiber includes a substrate and a plurality of refraction index-adjusting material layers, each having a different refraction index, wherein the refraction index distribution of the fiber is the same as an electric field power distribution of incident light to be transmitted through the fiber. The photonic crystal fiber can minimize pulse dispersion caused by light loss and refraction-index deviation due to the incident light passing through a zone away from an actual core.
摘要:
An optical fiber for long-distance optical communication networks has a zero dispersion wavelength value in the range of 1560 to 1570 nm and a dispersion gradient value, at a wavelength band of 1550 nm, in the range of 0.055 to 0.075 ps/nm2/km.