Title:
OPTICAL SIGNAL GENERATING DEVICE AND OPTICAL SIGNAL GENERATING METHOD
Document Type and Number:
WIPO Patent Application WO/2024/079894
Kind Code:
A1
Abstract:
An optical modulator according to the present invention is a Mach-Zehnder interferometer wherein a light is branched and inputted to first and second Mach-Zehnder-type modulators and wherein lights outputted by the respective ones of the first and second Mach-Zehnder-type modulators are combined to generate a QAM signal. First and second drive-signal-applied electrodes change the optical path lengths of first and second arms of the first Mach-Zehnder-type modulator in accordance with first and second drive signals, respectively, which are multivalued electric signals. Third and fourth drive-signal-applied electrodes change the optical path lengths of first and second arms of the second Mach-Zehnder-type modulator in accordance with third and fourth drive signals, respectively, which are multivalued electric signals. First to fourth drive signal generating units generate and apply the first to fourth drive signals to the first to fourth drive-signal-applied electrodes, respectively. The first to fourth drive signals are mutually independent addition signals.
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Inventors:
KAWAKAMI HIROTO (JP)
NAKAMURA MASANORI (JP)
MIYAMOTO YUTAKA (JP)
NAKAMURA MASANORI (JP)
MIYAMOTO YUTAKA (JP)
Application Number:
PCT/JP2022/038404
Publication Date:
April 18, 2024
Filing Date:
October 14, 2022
Export Citation:
Assignee:
NIPPON TELEGRAPH & TELEPHONE (JP)
International Classes:
H04B10/556
Foreign References:
| JP2010028741A | 2010-02-04 | |||
| JP2007288591A | 2007-11-01 |
Other References:
QU ZHEN; DJORDJEVIC IVAN B.: "On the Probabilistic Shaping and Geometric Shaping in Optical Communication Systems", IEEE ACCESS, IEEE, USA, vol. 7, 1 January 1900 (1900-01-01), USA , pages 21454 - 21464, XP011712083, DOI: 10.1109/ACCESS.2019.2897381
Attorney, Agent or Firm:
SHIGA INTERNATIONAL PATENT OFFICE (JP)
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