Optical amplifier and optical fiber

An optical amplifier and optical amplification technology, applied in lasers, laser parts, multi-level optical transmission, etc., can solve the problem of inability to effectively suppress four-wave mixing

Inactive Publication Date: 2006-12-27
FUJITSU LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Four-wave mixing tends to occur frequently especially in EDF used in transmission technologies such as WDM where multiple wavelengths are multiplexed
It can be recognized that even using EDF with negative dispersion in WDM transmission cannot effectively suppress four-wave mixing

Method used

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  • Optical amplifier and optical fiber
  • Optical amplifier and optical fiber
  • Optical amplifier and optical fiber

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Embodiment Construction

[0072] Embodiments of the present invention will be described below with reference to the drawings. figure 1 is a view for explaining the principle of the optical amplifier according to the present invention. The optical amplifier 10 includes an optical fiber 11, an excitation part 12 and a multiplexing part 13, and amplifies an optical signal.

[0073] The optical fiber 11 is an optical amplifying medium having positive dispersion in a signal band including signal light to be propagated, and amplifying a wavelength division multiplexed (WDM) signal including a plurality of wavelengths. The excitation unit 12 inputs excitation light to the optical fiber 11 .

[0074] The multiplexing unit 13 combines the WDM signal light and excitation light. The multiplexed signal is input to the optical fiber 11 . The WDM signal light is amplified by the excitation light in the optical fiber 11 and output from the optical fiber 11 . The optical fiber 11 has positive dispersion, so the o...

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Abstract

An optical amplifier that improves the quality of WDM transmission by reducing four-wave mixing. An optical fiber has positive chromatic dispersion in a signal band and is used as an optical amplification medium for amplifying a wavelength division multiplex signal. An excitation section inputs excitation light to the optical fiber. In order to actualize mismatching of phases of optical signals with different wavelengths to be propagated, the optical fiber has positive chromatic dispersion in a signal band by which there is a great difference between a signal frequency, being a frequency of a signal to be amplified, and a zero-dispersion frequency, being a frequency at which chromatic dispersion is zero. As a result, the optical fiber functions as an optical amplification medium in which four-wave mixing is suppressed.

Description

technical field [0001] The present invention relates to optical amplifiers and optical fibers, and more particularly to an optical amplifier for amplifying optical signals, and an optical fiber used as an optical amplification medium for amplifying optical signals. Background technique [0002] It is hoped that more advanced services can be provided through optical communication networks. Wavelength Division Multiplexing (WDM) is widely used as an optical transmission technology. WDM multiplexes multiple optical signals with different wavelengths into a single optical fiber. [0003] With WDM, by utilizing the broadband amplification characteristics of optical amplifiers, wavelength-division multiplexing signals containing multiple wavelengths are amplified and transmitted in long-distance trunk lines, and, for example, metropolitan ring networks are constructed in cities through their wavelength routing functions. [0004] There are many types of optical amplifiers. For ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/10H01S3/067H04J14/02
CPCH01S3/06758H04B10/291H01S3/09415H04B2210/003H04B2210/256H01S2301/04H01S3/06725H01S3/06729H01S3/094011H01S3/06754H01S3/0064
Inventor 宿南宣文稻垣真也
Owner FUJITSU LTD
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