Hybrid single and multimode optical fiber for a home network

Abstract

The invention relates to a hybrid optical fiber that includes a multi-segmented optical core exhibiting a refractive graded-index profile typically used to support multimode transmission in which a step-index is added at the center of the optical core, the profile parameters (a s ) and (” s ) of this step-index being tuned so as to provide an optical fiber that transmits both error free multimode optical signals and error free single-mode optical signals. The implementation of such a refractive index profile n(r) of the optical core, as well as the choice of an adequate value of the parameters (a s ) and (” s ) lead to adapt the fundamental mode of the optical fiber such that the optical power coupled into the fundamental mode is maximized at the wavelength of the single-mode transmission, 1550 nm for example, while preserving a relatively reduced modal dispersion at the wavelength of the multimode transmission, 850 nm for example.

Description

1. Technical field

[0001] The present invention relates to optical fiber transmission, in particular, to a home network optical fiber supporting single-mode transmission and multi-mode transmission. 2. Background technology

[0002] Optical fibers generally consist of a fiber core, which transmits an optical signal, and a fiber cladding, which confines the optical signal within the fiber core. For this, the refractive index n of the core c greater than the refractive index n of the cladding g . A fiber is often characterized by its refractive index profile, which relates the fiber's refractive index (n) to the fiber's radius (r), where: the X-axis shows the distance r from the center of the fiber, and the Y-axis shows the The difference between the refractive index at radius r and the refractive index of the fiber cladding.

[0003] Today, there are two main categories of optical fiber: multimode optical fiber and single-mode optical fiber. In multimode fiber, for a giv...

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