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A bend-insensitive optical fiber

A bend-insensitive, fiber-optic technology, applied in cladding fiber, multi-layer core/cladding fiber, etc., can solve the problem of large difference in refractive index between fiber core and cladding, fundamental mode connection loss cannot be reduced, and poor matching etc. to achieve the effects of low bending loss transmission, simple structure, and low bending loss

Active Publication Date: 2015-12-09
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the large refractive index difference between the fiber core and the cladding of the dual-mode optical fiber with a step structure, its mode field distribution is poorly matched with the single-mode optical fiber. reduce
In fact, even if the mode field diameters of the two fibers are equal, if the mode field distribution of the modes in the two fibers is different, it will lead to connection loss

Method used

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  • A bend-insensitive optical fiber
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Examples

Experimental program
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Effect test

Embodiment 1

[0025] The inner core radius of the optical fiber is a=4.35μm, and the refractive index difference between the inner core and the outer core is n core1 -n core2 =0.005, the refractive index difference between the outer core and the cladding n core2 -n clad =0.0035, the outer core width h=4μm. At a wavelength of 1.31 microns, its mode field diameter is 9 microns, and the connection loss with common single-mode fiber is less than 0.03dB. When the bending radius of the optical fiber is 5mm, its bending loss is less than 0.05dB / m.

Embodiment 2

[0027] The inner core radius of the optical fiber is a=4.35μm, and the refractive index difference between the inner core and the outer core is n core1 -n core2 =0.005, the refractive index difference between the outer core and the cladding n core2 -n clad =0.005, the outer core width h=5μm. At a wavelength of 1.31 microns, the mode field diameter is 9 microns. The connection loss with ordinary single-mode fiber is less than 0.03dB. When the bending radius of the optical fiber is 5mm, the bending loss is less than 0.01dB / m.

Embodiment 3

[0029] The inner core radius of the optical fiber is a=4μm, and the refractive index difference between the inner core and the outer core is n core1 -n core2 =0.0044, the refractive index difference between the outer core and the cladding n core2 -n clad =0.004, the outer core width h=4.5μm. At a wavelength of 1.31 microns, its mode field diameter is 8.9 microns. The connection loss with ordinary single-mode fiber is less than 0.03dB. When the bending radius of the optical fiber is 5mm, the bending loss is less than 0.01dB / m.

[0030] The above optical fibers can be realized by the same manufacturing process as ordinary single-mode optical fibers.

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Abstract

The invention discloses a bend insensitive fiber which comprises an inner fiber core, an outer fiber core and a clad layer. Refractive indexes of the inner fiber core, the outer fiber core and the clad layer meet ncore1>ncore2>nclad, wherein the ncore1, the ncore2, the nclad represent the refractive indexes of the inner fiber core, the outer fiber core and the clad layer respectively. The cut-off wavelength (namely, the wavelength in a high-order mode) of the fiber is larger than 1.26 micrometers, namely, the fiber is not a single-mode fiber. The fiber has quite low bend loss, mode field distribution of the fiber is matched with that of a common single-mode fiber, and a fiber communication system comprising the fiber and the common single-mode fiber can realize single-mode transmission in a wide wavelength range.

Description

technical field [0001] The invention relates to the field of optical fiber communication, in particular to an optical fiber with low bending loss characteristics. Background technique [0002] In short-distance optical communication systems such as fiber-to-the-home, it is required that the optical fiber can still be used normally under a small bending radius. This kind of optical fiber is called a bend-insensitive optical fiber. Bend-insensitive fibers can be realized by reducing the core size of standard single-mode fibers, introducing grooved cladding structures, and adopting hole-assisted fiber structures [K.Himeno, S.Matsuo, N.Guan, and A. Wada, "Low-Bending-Loss Single-Mode Fibers for Fiber-to-the-Home," Journal of Lightwave Technology, 2005, 23(11): 3494-3499.]. For example, using a grooved cladding structure can make the bending loss less than 0.01dB / turn when the bending radius is 10mm, and the connection loss with common optical fibers is less than 0.16dB. [000...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/036
Inventor 陈明阳龚天翼张永康陆驹
Owner JIANGSU UNIV
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