Title:
光ファイバ増幅器の制御方法および光伝送システム
Document Type and Number:
Japanese Patent JP4298570
Kind Code:
B2
Abstract:
In one of control methods of a bidirectional pumping type Raman amplifier according to the present invention, the power of a pumping light supplied to a rare-earth element doped optical fiber is increased or decreased, and a transmission wavelength characteristic of a dynamic gain equalizer is controlled according to a change in a gain wavelength characteristic occurring due to the increase or decrease of the power of the pumping light, to thereby extend a signal light band to either a short wavelength side or a long wavelength side. As a result, it becomes possible to realize a signal light band extension service at a low cost. Moreover, in another control method of the present invention, in a condition where the supply of backward pumping light to the transmission path fiber is shut off, a ratio of a change in the output power of the signal light to a change in the power of the forward pumping light is obtained, and the forward pumping light power is optimized in accordance with this ratio, to obtain a desired level diagram irrespective of a lump loss on the transmission path fiber.
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Inventors:
Yasushi Sugaya
Shinichiro Muro
Etsuko Hayashi
Shinichiro Muro
Etsuko Hayashi
Application Number:
JP2004118096A
Publication Date:
July 22, 2009
Filing Date:
April 13, 2004
Export Citation:
Assignee:
富士通株式会社
International Classes:
G02F1/35; H01S3/10; H01S3/00; H01S3/067; H01S3/30; H04B10/07; H04B10/2537; H04B10/29; H04B10/294; H04J14/00; H04J14/02; H01S3/094; H01S3/0941; H01S3/13; H01S3/16
Domestic Patent References:
| JP2002076482A | ||||
| JP2001103013A | ||||
| JP2001024261A | ||||
| JP2000252923A |
Attorney, Agent or Firm:
Tomijio Sasashima