OPTICAL AMPLIFIER GAIN CONTROLLING APPARATUS AND METHOD - Nippon Telegraph and Telephone Corporation

Title:

OPTICAL AMPLIFIER GAIN CONTROLLING APPARATUS AND METHOD

Document Type and Number:

Japanese Patent JP3298404

Kind Code:

B2

Abstract:

PROBLEM TO BE SOLVED: To automatically and dynamically control the gain deviation between wavelengths of an optical wavelength-multiple signal against the time variation by adaptively controlling the attenuations of lower-order diffracted lights at wavelengths to combine them, using an optical divider utilizing the diffraction effect of the light for dividing the wavelength-multiple signal into individual optical wavelength signals.
SOLUTION: An optical wavelength-multiple signal 1 composed of wavelength- multipled optical signals at wavelengths λ1, λ2,..., λn is inputted to an optical wavelength-multiple signal dividing means 2 which divides it into individual optical wavelength signals and the most of them are inputted to an optical attenuating means 3. An optical attenuation control means 6 controls the optical attenuations to be set for the optical attenuating means 3 according to the optical power levels of higher- order diffracted lights at wavelengths obtained by a higher-order diffracted light power detecting means 5 so that the light intensities of lower-order diffracted lights at wavelengths may be equal. Corresponding lower-order diffracted lights outputted from the means 3 to the wavelengths are fed to an optical signal combining means 4 to output a wavelength-multiple signal 7 composed of optical signals at wavelengths λ1, λ2,..., λn.

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Inventors:

Yasuhiko Tada
Nobuhiro Hirayama
Yukio Kobayashi

Application Number:

JP10047696A

Publication Date:

July 02, 2002

Filing Date:

April 22, 1996

Export Citation:

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Assignee:

Nippon Telegraph and Telephone Corporation

International Classes:

G02F1/35; G02B6/12; G02B6/122; G02B6/293; H01S3/06; H01S3/10; H04B10/07; H04B10/255; H04B10/29; H04B10/296; (IPC1-7): H01S3/10

Domestic Patent References:

JP537472A
JP5313029A
JP798424A
JP6420506A
JP715074A
JP2137411A

Attorney, Agent or Firm:

Furuya Fumio

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