Title:
【発明の名称】波長分割多重化信号の過増幅を回避するために光学的増幅器連鎖を飽和するための方法および装置
Document Type and Number:
Japanese Patent JP2001502143
Kind Code:
A
Abstract:
An optical signal processing method and apparatus for providing a noise feedback loop that uses existing noise within the optical system to saturate a chain of amplifiers after the branching unit, thereby preventing information channels in a WDM signal containing empty channels from becoming overamplified as they pass through downstream amplifiers. The method and apparatus uses an existing drop amplifier which emits ASE noise as a side effect. A coupler connects the ASE noise to a filter. The filtered ASE noise is fed into an existing trunk amplifier by a second coupler. The trunk amplifier increases gain to the filtered ASE noise to a level high enough to saturate the amplifier chain, without requiring an external noise generating device.
Inventors:
Pedersen, Bo
Application Number:
JP51777698A
Publication Date:
February 13, 2001
Filing Date:
October 09, 1997
Export Citation:
Assignee:
Tycho Submarine Systems Limited
International Classes:
H01S3/10; G02B6/34; H04B10/07; H04B10/2543; H04B10/29; H04B10/293; H04B10/296; H04B10/564; H04B10/572; H04J14/00; H04J14/02; (IPC1-7): H04B10/17; H01S3/10; H04B10/04; H04B10/06; H04B10/14; H04B10/16; H04J14/00; H04J14/02
Attorney, Agent or Firm:
Takashi Ishida (4 others)