Title:
OPTICAL AMPLIFIER
Document Type and Number:
Japanese Patent JP3368915
Kind Code:
B2
Abstract:
PURPOSE: To fix an exciting light wavelength to an optimum exciting wavelength of a rare earth element-added fiber and to realize an optical amplifier having a high efficiency and low noise by controlling a wavelength of an exciting light with the optimum exciting wavelength as a target by utilizing a table or a calculator in which an exciting light loss, a signal gain and the exciting light wavelength are related.
CONSTITUTION: A rare earth element-added fiber optical amplifier has a table or a calculator in which an exciting light loss, a signal gain and an exciting light wavelength are related. Thus, the exciting light wavelength can be reversely calculated from a monitored signal gain and exciting light loss. Accordingly, if the exciting light wavelength is deviated from an optimum exciting wavelength, the wavelength of the exciting light is controlled with the optimum exciting wavelength as a target, and hence the exciting light wavelength can be fixed to the optimum wavelength. If the gain is not controlled to a predetermined value, the exciting wavelength can be fixed to the optimum wavelength by the table or a calculation formula in which the gain and the loss are related in the optimum exciting light wavelength.
Inventors:
Kazuo Aida
Koji Masuda
Kiyoshi Nakagawa
Koji Masuda
Kiyoshi Nakagawa
Application Number:
JP9121892A
Publication Date:
January 20, 2003
Filing Date:
April 10, 1992
Export Citation:
Assignee:
Nippon Telegraph and Telephone Corporation
International Classes:
H01S3/07; H01S3/06; H01S3/094; H01S3/10; H01S3/13; (IPC1-7): H01S3/10
Attorney, Agent or Firm:
Takumi Irito (2 outside)
Previous Patent: CLOCK CIRCUIT AND MAGNETIC DISC UNIT EMPLOYING CLOCK CIRCUIT
Next Patent: PIPE CUTTING EQUIPMENT
Next Patent: PIPE CUTTING EQUIPMENT