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Raman amplifier and optical communication system including the same

a technology of amplifier and amplifier, which is applied in the direction of electrical equipment, active medium shape and construction, laser details, etc., can solve the problems of low design flexibility and insufficient raman amplification gain, and achieve effective control of noise figure deterioration, low noise, and high gain

Inactive Publication Date: 2008-03-27
SUMITOMO ELECTRIC IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This design achieves high Raman amplification gain and effective dispersion compensation, reducing noise figure deterioration and increasing design flexibility for both functions, while minimizing loss in the signal light wavelength band.

Problems solved by technology

But, if the dispersion compensating optical fiber for which the length is set like this is applied to the Raman amplifier as a Raman amplification optical fiber, a sufficient Raman amplification gain may not be obtained.
Therefore, in a conventional Raman amplifier, the design flexibility thereof is low for both of the device design considering Raman amplification and the device design considering dispersion compensation.

Method used

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  • Raman amplifier and optical communication system including the same
  • Raman amplifier and optical communication system including the same
  • Raman amplifier and optical communication system including the same

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Effect test

first embodiment

of Raman Amplifier

[0036]FIG. 1 is a diagram depicting the configuration of the first embodiment of the Raman amplifier according to the present invention. The Raman amplifier 1 according to the first embodiment comprises an optical isolator 111, a Raman amplification optical fiber 121, an optical coupler 141 (included in the first optical multiplexing structure), a dispersion compensating optical fiber 132, an optical coupler 142 (included in the second optical multiplexing structure), and an optical isolator 112, which are sequentially provided from the input end 101 to the output end 102. The semiconductor laser light sources 161a to 161c (first pumping light source) are connected to the optical coupler 141 through the optical multiplexer 151. The semiconductor laser light sources 162a to 162c (second pumping light source) are connected to the optical coupler 142 through the optical multiplexer 152. The optical couplers 141 and 142 (first and second optical multiplexing structures...

second embodiment

of Raman Amplifier

[0050]FIG. 2 is a diagram depicting the configuration of the second embodiment of the Raman amplifier according to the present invention. The Raman amplifier 2 according to the second embodiment is different from the Raman amplifier 1 according to the first embodiment in that a new Raman amplification optical fiber 122 is provided between the dispersion compensating optical fiber 132 and the optical coupler 142. The dispersion compensating optical fiber 132 is arranged between the forward stage Raman amplification optical fiber 121 and the backward stage Raman amplification optical fiber 122.

[0051] In the Raman amplifier 2 according to the second embodiment, the optical amplification section comprises the forward stage Raman amplification optical fiber 121, the optical coupler 141 (first optical multiplexing structure), an optical multiplexer 151, the semiconductor laser light sources 161a to 161c (first pumping light source), the backward stage Raman amplificatio...

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Abstract

The present invention relates to a Raman amplifier where flexibility in device design considering both of Raman amplification and dispersion compensation is high. In the Raman amplifier, the Raman amplification optical fiber included in the optical amplification section and the dispersion compensating optical fiber included in the dispersion compensation section are arranged while being optically connected to each other. Since the optical amplification section and the dispersion compensation section are provided as independent optical devices, one device can be designed without being restricted to the design conditions of the other device.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a Raman amplifier Raman-amplifying signal light of a plurality of channels having wavelengths different from each other, and an optical communication system including the same. [0003] 2. Related Background Art [0004] A rare earth element-doped optical fiber amplifier which uses a rare earth element-doped optical fiber as an optical amplification medium is an optical device having a structure for supplying pumping light having a wavelength to pump the rare earth element into the optical fiber, and amplifying signal light by using the transition between the energy levels of the rare earth element. Therefore, in a rare earth element-doped optical fiber amplifier, the wavelength band range of signal light which can be amplified is limited. Whereas the Raman amplifier is an optical amplifier using the Raman scattering phenomena in an optical fiber where signal light propagates, and if the...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H01S3/00H01S3/067H01S3/094H01S3/30
CPCH01S3/06725H01S3/06754H01S3/302H01S3/09408H01S3/094096H01S3/094003
Inventor TSUZAKI, TETSUFUMIKAKUI, MOTOKITERAHARA, TAKAFUMIKUMASAKO, JUNICHI
Owner SUMITOMO ELECTRIC IND LTD