Title:
OPTICAL AMPLIFIER FOR WAVELENGTH MULTIPLEXING AND OPTICAL COMMUNICATION SYSTEM
Document Type and Number:
Japanese Patent JP3844902
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide an optical amplifier for WDN(wavelength division multiplexing) and an optical communication system which secures the wavelength flatness of gain even for input light in a wide level range and can obtain a noise characteristic of less wavelength dependence.
SOLUTION: The fundamental constitution of the optical amplifier for WDN is provided with an optical amplification part 1 connected between an input port IN and an output port OUT, an input light monitor part 2 which measures the power of input light inputted to the input port IN, a variable gain equalizer 3 which is connected to the optical amplification part 1 and has a variable loss wavelength characteristic, and a gain equalization control part 4 which controls the loss wavelength characteristic of the variable gain equalizer 3 in accordance with the input light power measured by the input light monitor part 2. Thus, the variable gain equalizer 3 has the loss wavelength characteristic corresponding to the change of the gain wavelength characteristic of the optical amplification part 1, and the gain deviation of output light is compensated.
Inventors:
Miki Onaka
Susumu Kinoshita
Susumu Kinoshita
Application Number:
JP5437499A
Publication Date:
November 15, 2006
Filing Date:
March 02, 1999
Export Citation:
Assignee:
富士通株式会社
International Classes:
H01S3/10; H01S3/06; H01S3/067; H01S3/13; H04B10/07; H04B10/29; H04B10/293; H04B10/294; H04B10/564; H04B10/572; H04J14/00; H04J14/02; (IPC1-7): H04B10/17; H04B10/16; H01S3/10; H04J14/00; H04J14/02; H04B10/14; H04B10/06; H04B10/04
Domestic Patent References:
| JP9018416A | ||||
| JP10022924A |
Attorney, Agent or Firm:
Tomijio Sasashima
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