Optical transmission device, optical modulator, and bias control method

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United States of America Patent

PATENT NO 9989786
APP PUB NO 20170293165A1
SERIAL NO

15477763

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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An optical transmission device includes an optical modulator and a processor. The optical modulator optically modulates an optical signal with a driving signal to output a modulated optical signal. The processor performs ABC on a bias of the optical modulator, using the modulated optical signal, so as to cause the bias to converge to an optimum point. The processor starts the ABC using a modulated optical signal optically modulated with a QPSK signal at start-up timing, acquires an optimum value that is a bias value when the bias converges to the optimum point, and stops the ABC. After the ABC is stopped, the processor sets the acquired optimum value as an initial value, and restarts the ABC using a modulated optical signal optically modulated with an N-QPSK signal.

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Patent Owner(s)

  • FUJITSU LIMITED

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Akiyama, Yuichi Kawasaki, JP 73 910
Kaneoka, Tomohiro Kawasaki, JP 4 8
Ogiwara, Hiroshi Kawasaki, JP 16 139

Cited Art Landscape

Patent Info (Count) # Cites Year
 
NEC CORPORATION (1)
* 2014/0029,956 OPTICAL TRANSMITTER AND METHOD FOR CONTROLLING THE SAME 3 2011
 
FUJITSU OPTICAL COMPONENTS LIMITED (6)
* 2012/0155,880 OPTICAL MODULATOR AND OPTICAL MODULATION CONTROL METHOD 17 2011
* 2013/0156,444 OPTICAL MODULATION DEVICE AND CONTROL METHOD IN OPTICAL MODULATION DEVICE 4 2012
* 2013/0148,981 OPTICAL TRANSMITTER 3 2012
* 9762331 Optical communication apparatus and method of controlling optical modulator 1 2015
* 2016/0056,896 OPTICAL COMMUNICATION DEVICE AND METHOD OF CONTROLLING OPTICAL MODULATOR 2 2015
* 2016/0156,416 OPTICAL TRANSMITTER AND BIAS CONTROL METHOD FOR OPTICAL MODULATOR 1 2015
 
CIENA CORPORATION (1)
* 2014/0308,047 OPTIMUM MODULATOR BIAS SYSTEMS AND METHODS IN COHERENT OPTICAL TRANSMITTERS 6 2013
 
KABUSHIKI KAISHA TOSHIBA (1)
* 7308210 Optical modulating device, optical transmitting apparatus using the same, method of controlling optical modulating device, and control program recording medium 7 2003
 
FUJITSU LIMITED (3)
* 2005/0105,917 Optical modulating apparatus 10 2004
* 2008/0080,872 OPTICAL TRANSMITTER 39 2007
* 2017/0293,165 OPTICAL TRANSMISSION DEVICE, OPTICAL MODULATOR, AND BIAS CONTROL METHOD 1 2017
* Cited By Examiner

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