Title:
OPTICAL TRANSMITTER, OPTICAL RECEIVER AND COMMUNICATION SYSTEM
Document Type and Number:
WIPO Patent Application WO/2019/031447
Kind Code:
A1
Abstract:
This optical transmitter is provided with: a first narrow-band signal processing unit to which a first signal and a second signal are inputted, and which outputs a first narrow-band signal indicating a sum of respective in-phase components of the first and second signals, a second narrow-band signal indicating a difference between respective orthogonal components of the first and second signals, a third narrow-band signal indicating a difference between the respective in-phase components of the first and second signals, and a fourth narrow-band signal indicating a sum of the respective orthogonal components of the first and second signals; a wide-band signal generation unit which generates a first wide-band signal by frequency-shifting the first and second narrow-band signals by multiplying the first and second narrow-band signals by sine-wave signals orthogonal thereto, and combining the frequency-shifted first and second narrow-band signals, and generates a second wide-band signal by frequency-shifting the third and fourth narrow-band signals by multiplying the third and fourth narrow-band signals by sine-wave signals orthogonal thereto, and combining the frequency-shifted third and fourth narrow-band signals; and an optical modulator which modulates an optical signal using the first and second wide-band signals, and outputs the modulated optical signal.
Inventors:
HAMAOKA FUKUTARO (JP)
NAKAMURA MASANORI (JP)
NAKAMURA MASANORI (JP)
Application Number:
PCT/JP2018/029400
Publication Date:
February 14, 2019
Filing Date:
August 06, 2018
Export Citation:
Assignee:
NIPPON TELEGRAPH & TELEPHONE (JP)
International Classes:
H04B10/516; H04B10/61
Domestic Patent References:
| WO2017033446A1 | 2017-03-02 |
Foreign References:
| JP2005328327A | 2005-11-24 | |||
| US20160323040A1 | 2016-11-03 | |||
| JP2017153281A | 2017-08-31 | |||
| JP2017153282A | 2017-08-31 |
Other References:
YAMAZAKI, HIROSHI ET AL.: "Discrete Multitone Transmission at Net Data Rate of 250 Gb/s Using Digital-Preprocessed Analog-Multiplexed DAC With Halved Clock Frequency and Suppressed Image", JOURNAL OF LIGHTWAVE TECHNOLOGY, vol. 35, no. 7, 1 April 2017 (2017-04-01), IEEE, USA, pages 1300 - 1306, XP011645659, DOI: 10.1109/JLT.2017.2650205
HIROSHI YAMAZAKI ET AL.: "Digital-Preprocessed Analog-Multiplexed DAC for Ultrawideband Multilevel Transmitter", JOURNAL OF LIGHTWAVE TECHNOLOGY, vol. 34, no. 7, 11 December 2015 (2015-12-11), pages 1579 - 1584, XP011609195, DOI: 10.1109/JLT.2015.2508040
JOE BERTHOLD: "100G Ultra Long Haul DWDM Framework Document", OIF (OPTICAL INTERNETWORKING FORUM, 30 June 2009 (2009-06-30)
HIROSHI YAMAZAKI ET AL.: "Digital-Preprocessed Analog-Multiplexed DAC for Ultrawideband Multilevel Transmitter", JOURNAL OF LIGHTWAVE TECHNOLOGY, vol. 34, no. 7, 11 December 2015 (2015-12-11), pages 1579 - 1584, XP011609195, DOI: 10.1109/JLT.2015.2508040
JOE BERTHOLD: "100G Ultra Long Haul DWDM Framework Document", OIF (OPTICAL INTERNETWORKING FORUM, 30 June 2009 (2009-06-30)
Attorney, Agent or Firm:
SHIGA INTERNATIONAL PATENT OFFICE (JP)
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