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Raman amplifier

A Raman amplifier and Raman amplification technology, which is applied in the direction of instruments, lasers, phonon exciters, etc., can solve the problem that the gain spectrum is not easy to flatten

Inactive Publication Date: 2008-05-14
SUMITOMO ELECTRIC IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is necessary to control the loss spectrum of the gain equalizer, and similarly, it is not easy to control the gain spectrum flattening of the Raman amplifier

Method used

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no. 1 Embodiment

[0031] First, a first embodiment of the Raman amplifier of the present invention will be described. FIG. 1 is a configuration diagram of a Raman amplifier 1 of the first embodiment. The Raman amplifier 1 is equipped with an optical fiber 11 for Raman amplification and an optical circulator 12 1 , 12 2 , an excitation light source unit 13 , a control unit 14 , a bandpass filter 15 , a photoelectric element 16 and a one-way waveguide 17 .

[0032] Optical fiber 11 for Raman amplification consists of optical circulator 12 2 Supply the excitation light for Raman amplification from the optical circulator 12 1 Optical Circulator 12 2 The signal light is transmitted, and the signal light is Raman amplified at the same time. The unidirectional waveguide 17 only passes light in the forward direction and does not allow light to pass in the reverse direction. Optical Circulator 12 1 The signal light arriving from the optical fiber 11 for Raman amplification is output to the optica...

no. 2 Embodiment

[0048] Next, the second embodiment of the Raman amplifier of the present invention will be described. FIG. 6 is a configuration diagram of the Raman amplifier 2 of the second embodiment. This Raman amplifier 2 comprises Raman amplification fiber 21, optical glass 22 1 ~22 3 , excitation light source unit 23 1 ,twenty three 2 , a control unit 24 , an AWG (Arrayed-Waveguide Grating: Arrayed Waveguide Grating) 25 , and a photoelectric element 26 .

[0049] Optical fiber 21 for Raman amplification is made of optical glass 22 1 and optical glass 22 2 Supply Raman amplification with excitation light, and from the optical glass 22 1 Optical glass 22 2 The signal light is propagated, and Raman amplification is performed on the signal light at the same time. Optical glass 22 1 The signal light that arrives at this Raman amplifier 2 is output to the optical fiber 21 for Raman amplification, and at the same time, the signal light from the excitation light source unit 23 1 The a...

no. 3 Embodiment

[0061] Next, a third embodiment of the Raman amplifier of the present invention will be described. FIG. 7 is a configuration diagram of the Raman amplifier 3 of the third embodiment. This Raman amplifier 3 comprises Raman amplification fiber 31, optical glass 32 1 ~32 4 , excitation light source unit 33 1 、33 2 , the control unit 34, the AWG35, the photoelectric element 36 and the OTDR unit 37.

[0062] Optical fiber 31 for Raman amplification is made of optical glass 32 1 and optical glass 32 2 Supply the excitation light for Raman amplification, from the optical glass 32 1 Optical glass 32 2 The signal light is propagated, and Raman amplification is performed on the signal light at the same time. Optical glass 32 1 will be made of optical glass 32 4 The arriving signal light is output to the optical fiber 31 for Raman amplification, and will also be transmitted from the excitation light source unit 33 1 The arriving excitation light for Raman amplification is outp...

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Abstract

Raman amplification pumping light output from a pumping light source unit is supplied to a Raman amplification optical fiber through an optical circulator 12<2>. The remaining Raman amplification pumping light is detected by a light-receiving element through an optical circulator 12<2> and bandpass filter. Signal light that has reached a Raman amplifier propagates through the Raman amplification optical fiber while being Raman-amplified. A control section controls the power or spectral shape of Raman amplification pumping light output from each of N pumping light sources included in the pumping light source unit on the basis of the power of the remaining Raman amplification pumping light, which is detected by the light-receiving element. Hence, a Raman amplifier capable of easily controlling gain spectrum flattening in the signal light wavelength band can be obtained.

Description

[0001] This application is a divisional application of the patent application with the application number 01123217.x, the application date being July 20, 2001, and the invention name being "Raman amplifier". technical field [0002] The invention relates to a Raman amplifier which uses Raman amplification to compensate transmission loss when signal light is transmitted by an optical transmission line in an optical communication system using signal light for communication. Background technique [0003] In an optical communication system using signal light for communication, the signal light emitted from the transmitter suffers transmission loss when it is transmitted through an optical transmission line, and the power decreases when it reaches the receiver. If the optical power of the signal reaching the receiver is lower than the specified value, normal optical communication may occur due to a reception error. Therefore, by providing an optical amplifier between the transmit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/383G02F1/39G02F1/35G02B6/38G02F1/365H01S3/06H01S3/067H01S3/094H01S3/0941H01S3/30
CPCH04B10/2916G02B6/38
Inventor 津﨑哲文村嶋清孝
Owner SUMITOMO ELECTRIC IND LTD