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Optical fiber, optical transmission path using same and optical communication system

An optical transmission and optical fiber technology, which is applied in the field of optical transmission paths and optical communication systems, and can solve the problems of limiting the range of Raman excitation, limiting the cumulative dispersion relationship, and difficulty in Raman amplification.

Inactive Publication Date: 2014-02-19
FURUKAWA ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0018] However, even for the reduced dispersion tilt type NZ-DSF, its transmission range is limited by the zero dispersion wavelength on the short-wave side and by the cumulative dispersion relationship on the long-wave side
As a result, the wavelength range that can be transmitted is limited to around 200nm
In addition, in the case of Raman amplification, the zero dispersion wavelength of NZ-DSF limits the Raman excitation range, especially in the S-band range Raman amplification is difficult

Method used

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  • Optical fiber, optical transmission path using same and optical communication system
  • Optical fiber, optical transmission path using same and optical communication system
  • Optical fiber, optical transmission path using same and optical communication system

Examples

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Embodiment 1

[0080] Embodiment 1 of the present invention will be described below with reference to the drawings.

[0081] Fig. 1(a) shows the structure of the refractive index curve of the optical fiber embodiment 1 of the present invention. Fig. 1(b) shows the cross-sectional structure of this optical fiber. There can be various forms of refractive index curves as the optical fiber refractive index distribution curve. In embodiment 1, the distribution shape is relatively simple, the design and control of the refractive index distribution are easy, and the refractive index shown in figure (a) is adopted. curve.

[0082] The outer periphery of the fiber core 11 of Embodiment 1 is covered with cladding 7, and the above-mentioned core 11 has at least a first glass layer 1 at the center and a second glass layer 2 covering the outer periphery of the first glass layer. The refractive index difference Δ1 based on the cladding layer 7 of the first glass layer 1 is not less than 0.6% and not mor...

example 2

[0145] In the optical transmission channel of Example 2, the average dispersion value of the wavelength range (here, the entire wavelength range) set within the wavelength range from 1460nm to 1625nm is set to be -1.0ps / nm / km or more and 1.0ps / nm / km or less. The same effect as that of the optical transmission path of Example 1 above can be obtained. In addition, the optical transmission system applied to the optical transmission path of Example 2 also has the same effect as the optical transmission system applied to the optical transmission path of Example 1 above.

[0146] In the optical transmission path of Example 2, the maximum average dispersion is +0.96 ps / nm / km (value at a wavelength of 1540 nm), and the minimum average dispersion is -0.92 ps / nm / km (value at a wavelength of 1625 nm).

[0147] Embodiment 1 is not limited to the optical fibers and optical transmission paths described above, and various implementations can be adopted. For example, the optical fiber of emb...

Embodiment 2

[0151]The optical fiber of Example 2 of the present invention has a zero-dispersion wavelength of 1350 nm or less, can suppress the occurrence of FWM in a wide band range of 1400-1700 nm, and has dispersion characteristics capable of suppressing cumulative dispersion. The reduced dispersion tilt type NZ-DSF of the proposal mentioned above has dispersion characteristics that can be transmitted in the S, C, and L bands (1460-1625nm), but the optical fiber of Example 2 almost includes the U on the long-wave side of the entire region. In the entire band of the -band (1625~1675nm), and the wider band (1365~1700nm) of the E-band (1360~1460nm) on the shortwave side, the dispersion value D is 2≤D≤8(ps / nm / km), can suppress the occurrence of FWM, and has dispersion characteristics that can suppress cumulative dispersion.

[0152] When starting to use the optical fiber of embodiment 2 as a transmission path, in the amplification of at least one band in the S, C, and L-bands, by using th...

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Abstract

Optical fibers to form an optical transmission line suitable for WDM transmission in a wide-spreading wavelength band, having the following characteristics and parameters: a dispersion in absolute value of 0.5 ps / nm / km to 9 ps / nm / km in a wavelength band of 1430 nm to 1625 nm, a dispersion slope in absolute value of 0.04 ps / nm / km or less at a wavelength of 1550 nm, a mode field diameter of 7 mum or less at a wavelength of 1550 nm and a cable cutoff wavelength of less than 1430nm; core 11 surrounded by cladding 7, core 11 being at least two-layered (first layer 1 at the center and second layer 2 surrounding the first layer; relative refractive index of glass layer Delta 1 with reference to the cladding being adjusted to not less than 0.6 but not more than 1.6%, relative refractive index of second layer Delta 2 with reference to the cladding being adjusted to a negative value.

Description

[0001] This application is a divisional application of the application filed on February 13, 2003, with the application number 03104414.X, and the title of the invention is "optical fiber, optical transmission path and optical communication system using this optical fiber". technical field [0002] The present invention relates to an optical fiber suitable for wavelength segment multiplex transmission, an optical transmission path using the optical fiber, and an optical communication system. Background technique [0003] Due to the development of the information society, the amount of communication information tends to increase rapidly. With this increase in the amount of information, wavelength segment multiplexing is widely used in the communication field. Wavelength segment multiplexing is a method in which light of various wavelengths is transmitted through a single optical fiber. [0004] At present, an optical amplifier using erbium-doped fiber (EDFA) has been develope...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/02G02B6/036H04B10/2525G02F1/35H01S3/10H01S3/30
Inventor 熊野尚美杉崎隆一武笠和则八木健
Owner FURUKAWA ELECTRIC CO LTD