Optical fiber, optical fiber module, and raman amplifier

A Raman amplifier and optical fiber module technology, which is applied in clad optical fiber, optical waveguide light guide, optics, etc., can solve problems such as hindering high-speed optical communication and reducing the quality of signal optical communication

Inactive Publication Date: 2008-12-10
FURUKAWA ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0003] However, although this existing optical fiber obtains an amplification of 20dB or more with an excitation light of about 500mW, it also produces a large nonlinear phase shift at the same time, and there is a problem that the communication quality decreases due to the deterioration of the waveform of the signal light, which hinders the high-speed optical fiber. a major factor in communication

Method used

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  • Optical fiber, optical fiber module, and raman amplifier
  • Optical fiber, optical fiber module, and raman amplifier
  • Optical fiber, optical fiber module, and raman amplifier

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Embodiment Construction

[0024] Embodiments of the present invention will be described below with reference to the drawings. figure 1 is a block diagram showing the structure of the Raman amplifier of the embodiment of the present invention. This Raman amplifier 1 is a centralized Raman amplifier and has an optical fiber module 2 . The signal optical input terminal Tin is connected to the optical fiber module 2 through the optical connector 3a and the isolator 4a. The optical fiber module 2 connects the amplified signal light to the output terminal Tout through the isolator 4b and the optical connector 3b. The optical connector 3 b is connected to the excitation laser 5 , and outputs the excitation light from the excitation laser 5 to the side of the optical fiber module 2 .

[0025] The optical fiber module 2 has an amplifying optical fiber 2a, which will be described later, wound on a bobbin, and between the single-mode optical fiber (SMF) optical fiber 2b on the side of each isolator 4a, 4b and t...

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Abstract

The object of the present invention is to provide an optical fiber, an optical fiber module and a Raman amplifier capable of obtaining sufficient Raman amplification while suppressing nonlinear phase shift. The ratio of the Raman gain coefficient GR to the effective core cross-sectional area Aeff of the optical fiber (2a) for amplification, that is, the Raman gain efficiency (GR / Aeff) is more than 4 (m / W), and the nonlinear parameter γ is more than 4 (m / W) to the Raman gain efficiency ( The ratio of GR / Aeff) is 3 or less.

Description

technical field [0001] The invention relates to an optical fiber, an optical fiber module and a Raman amplifier suitable for high-speed optical communication. Background technique [0002] In recent years, a Raman amplifier can amplify in a desired wavelength bandwidth, and has attracted attention as an amplifier capable of achieving gain also in a wide wavelength region of 100 nm. The optical fiber used in the amplifying medium of this Raman amplifier is a quartz matrix, which is applicable to any optical fiber, but as a concentrated Raman amplifier, the Raman gain efficiency (GR / Aeff=Raman gain coefficient / effective Core cross-sectional area) 6.5 or more than 6.5 fibers, with about 500mW of excitation light to obtain a gain of 20dB or more. [0003] However, although this existing optical fiber obtains an amplification of 20dB or more with an excitation light of about 500mW, it also produces a large nonlinear phase shift at the same time, and there is a problem that the c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/02G02F1/35G02F1/39
Inventor 杉崎隆一谷口友规八木健
Owner FURUKAWA ELECTRIC CO LTD
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