Title:
OPTICAL RECEIVER, OPTICAL TRANSMITTER, OPTICAL AMPLIFYING REPEATER AND OPTICAL SIGNAL MONITORING SYSTEM
Document Type and Number:
Japanese Patent JP3642710
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide an optical signal monitoring system for monitoring a fault/quality without depending on a modulation system/signal format/signal bit rate when a fault occurs on an optical signal path on an optical network for handling multimedia services having various modulation systems/signal formats/signals bit rates.
SOLUTION: An optical layer in an optical network system converts an electric signal to an optical signal of a suitable carrier wavelength and performs signal transmission by applying time division multiplexing to a plurality of optical signals with a single wavelength or applying wavelength division multiplexing to the optical signals of a plurality of carrier wavelengths. The optical layer does not depend on the modulation system, signal format or signal bit rate of a signal to be handled. Therefore, by performing the analog monitoring of the noise deterioration and waveform distortion of the optical signal on the optical layer, the fault/quality can be monitored without depending on the modulation system, signal format or signal bit rate of the signal. By using this method, the identification of a fault block and route switching are performed.
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Inventors:
Company house Ippei
Hidehiko Takara
Kentaro Uchiyama
Yoshiaki Yamabayashi
Hidehiko Takara
Kentaro Uchiyama
Yoshiaki Yamabayashi
Application Number:
JP2000022587A
Publication Date:
April 27, 2005
Filing Date:
January 31, 2000
Export Citation:
Assignee:
Nippon Telegraph and Telephone Corporation
International Classes:
G01M11/02; H04B10/03; H04B10/07; H04B10/077; H04B17/00; (IPC1-7): H04B10/08; G01M11/02; H04B10/02; H04B17/00
Domestic Patent References:
| JP11163911A | ||||
| JP11223575A | ||||
| JP9159716A |
Attorney, Agent or Firm:
Yoshikazu Tani
Kazuo Abe
Kazuo Abe