Dual-mode optical fiber and communication system thereof

Abstract

The invention discloses a dual-mode optical fiber and a communication system thereof. The dual-mode optical fiber comprises an optical fiber core and a cladding, and in a wavelength range of between 1.25 and 1.65mu m, nclad-ncore is more than 0.004, and r is more than 4.5mu m, wherein the nclad is the cladding refractive index, the ncore is the optical fiber core refractive index, and the r is radius of the optical fiber core; the cut-off wavelength lambda c of an LP02 model of the optical fiber is between 1.1 and 1.25mu m, and the optical fiber maintains dual-mode transmission; and the mode field diameter M of the optical fiber equals to 8 to 10.5mu m at the wavelength of 1,310nm. The optical fiber communication system comprises a dual-mode optical fiber, a single-mode optical fiber, a light transmitter and a light receiver, wherein two ends of the dual-mode optical fiber are connected with the single-mode optical fiber respectively; and the other ends of the single-mode optical fiber are connected with the light transmitter and the light receiver respectively. The dual-mode optical fiber has low bending loss and large mode field, and the communication system can realize single-mode transmission and low connection loss of a broad range.

Description

technical field [0001] The invention relates to the field of optical fiber communication, in particular to a dual-mode optical fiber and an optical fiber communication system composed of it. Background technique [0002] At present, the backbone network of optical fiber communication has basically been laid, and short-distance optical communication has become the key development goal of optical fiber communication. The most important thing in short-distance optical communication is fiber-to-the-home. In order to meet the application requirements of fiber-to-the-home, ITU-T proposed the G.657 standard optical fiber. Optical cables conforming to the G.657 standard can be installed along small corners in buildings like copper cables, so non-professional technicians can also master the construction method. [0003] At present, there are three main types of bend-insensitive optical fibers: fiber with step-index profile [J. Lightwave Technol., 2005,23(11):3494], optical fiber wi...

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Problems solved by technology

Hole-assisted optical fiber can obtain lower loss when splicing with ordinary optical fiber, and the bending loss of optical fiber is also very low. However, due to the introduction of air holes in the optical fiber, the fusion splicing technology is more complicated, which is not conducive to engineering applications, and this optical fiber is flexible. When the connection loss is large, its application is limited

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