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Negative-dispersion optical fiber and optical transmission line incorporating same

A technology of optical transmission and negative dispersion, applied in optical fiber transmission, optical fiber with required dispersion, optics, etc., can solve the problems of signal waveform degradation, difficulty in realizing long-distance and large-capacity optical transmission, etc., and suppress the increase of transmission loss , the effect of long-distance and large-capacity optical transmission

Inactive Publication Date: 2006-05-31
SUMITOMO ELECTRIC IND LTD
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  • Application Information

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Problems solved by technology

This causes degradation of the signal waveform, making it difficult to achieve long-distance and large-capacity optical transmission

Method used

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  • Negative-dispersion optical fiber and optical transmission line incorporating same
  • Negative-dispersion optical fiber and optical transmission line incorporating same
  • Negative-dispersion optical fiber and optical transmission line incorporating same

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Embodiment Construction

[0037] Various embodiments of negative dispersion optical fibers and optical transmission lines including these negative dispersion optical fibers according to the present invention will be described below with reference to FIGS. 1A-2B and 3-15. In the description of the drawings, the same components are denoted by the same reference numerals, and repeated explanations are omitted.

[0038] Fig. 1A shows the structure of an optical transmission line according to the present invention. The optical transmission line 1 is provided with a positive dispersion fiber 20 having a positive dispersion at a wavelength of 1550 nm, and a negative dispersion fiber 10 having a negative dispersion at a wavelength of 1550 nm (negative dispersion fiber according to the present invention). Generally, the effective area of ​​the negative dispersion fiber 10 is smaller than that of the positive dispersion fiber 20 . Therefore, in order to suppress the occurrence of nonlinear optical phenomena, it...

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Abstract

The present invention relates to a negative dispersion optical fiber that compensates the dispersion of the positive dispersion optical fiber in a signal band with a short length, and an optical transmission line including the negative dispersion optical fiber. The negative dispersion fiber has the following characteristics at a wavelength of 1550 nanometers: a dispersion D of not more than -150ps / nm / km; the ratio (S / D) to the dispersion D is not less than 2.0×10 -3 / nm and not more than 4.7×10 -3 Dispersion gradient for conditions of / nm; and not less than 12 μm 2 but less than 25μm 2 effective area. In order to satisfy these properties, in the order stated from the center to the periphery, the negative dispersion fiber has a maximum refractive index of n 1 The core region of , the refractive index n 2 (<n 1 ) of the first cladding region, the refractive index n 3 (>n 2 ) of the second cladding region and the refractive index n 4 (<n 3 ) of the third cladding area.

Description

technical field [0001] The invention relates to a negative dispersion fiber for compensating the dispersion of a positive dispersion fiber having positive dispersion in the signal band, and also relates to an optical transmission line comprising the negative dispersion fiber. Background technique [0002] The optical transmission system transmits signals of multiple channels through an optical transmission line composed of optical fibers so as to enable long-distance and large-capacity communication. Silica-based optical fibers, commonly used in optical transmission lines, exhibit minimal transmission loss around a wavelength of 1.55 micrometers. On the other hand, an Erbium-Doped Fiber Amplifier (EDFA: Erbium-Doped Fiber Amplifier) ​​capable of amplifying a signal in the vicinity of a wavelength of 1.55 micrometers can be used as the optical amplifying means. For this reason, the C-band (1530nm-1560nm) is mainly used as a signal band. [0003] Since an EDFA capable of amp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/02G02B6/036G02B6/34H04B10/2507H04B10/2525H04B10/2543
CPCG02B6/02004G02B6/02261G02B6/0228G02B6/03627G02B6/03644G02B6/29377H04B10/2525G02B6/02G02B6/028
Inventor 加藤考利平野正晃
Owner SUMITOMO ELECTRIC IND LTD