Title:
WAVELENGTH MULTIPLEXED PHOTO-TRANSMISSION SYSTEM, PHOTO-RELAY DEVICE, AND LIGHT INTENSITY CONTROL METHOD
Document Type and Number:
WIPO Patent Application WO/2013/132596
Kind Code:
A1
Abstract:
Provided is a wavelength multiplexed photo-transmission system comprising a receiving node (1) which receives, amplifies, and outputs wavelength multiplexed light. The receiving node (1) further comprises: a photo-amplifier (16) which amplifies wavelength multiplexed light; a variable attenuator (15) which attenuates the intensity of the wavelength multiplexed light; a target value setting unit (13) which sets a target value of the post-amplification wavelength multiplexed light intensity; a control circuit (14) which controls the variable attenuator (15) such that the wavelength multiplexed light intensity reaches a target value after passing through the photo-amplifier (16) and the variable attenuator (15); a PD (8) which detects the total power of the wavelength multiplexed light; a photo-extraction filter (7) which extracts a signal of a portion of a waveband of the wavelength multiplexed light; and a PD (9) which detects the intensity of the extracted signal which is extracted by the photo-extraction filter (7). A determination is made, on the basis of whether the ratio of change of the total power and the ratio of change of the intensity of the extracted signal approximately match, whether to preserve or reset the target value.
Inventors:
TOKURA TOSHIYUKI (JP)
SUGIHARA TAKASHI (JP)
ISHIDA KAZUYUKI (JP)
SUGIHARA TAKASHI (JP)
ISHIDA KAZUYUKI (JP)
Application Number:
PCT/JP2012/055691
Publication Date:
September 12, 2013
Filing Date:
March 06, 2012
Export Citation:
Assignee:
MITSUBISHI ELECTRIC CORP (JP)
TOKURA TOSHIYUKI (JP)
SUGIHARA TAKASHI (JP)
ISHIDA KAZUYUKI (JP)
TOKURA TOSHIYUKI (JP)
SUGIHARA TAKASHI (JP)
ISHIDA KAZUYUKI (JP)
International Classes:
H04B10/16; H04B10/04; H04B10/06; H04B10/14; H04B10/17
Domestic Patent References:
| WO2007138649A1 | 2007-12-06 | |||
| WO2009016695A1 | 2009-02-05 |
Foreign References:
| JP2009165166A | 2009-07-23 | |||
| JP2010123698A | 2010-06-03 |
Attorney, Agent or Firm:
SAKAI, HIROAKI (JP)
Hiroaki Sakai (JP)
Hiroaki Sakai (JP)
Download PDF:
Claims: