Title:
SIGNAL GENERATOR AND SIGNAL GENERATING METHOD
Document Type and Number:
Japanese Patent JP2019039972
Kind Code:
A
Abstract:
To generate a signal such as a microwave and a millimeter wave, having phase noise suppressed, in a frequency-variable state without requiring a stable optical frequency comb reference light source specially.SOLUTION: A self-reference interferometer 107 causes an (n)th higher harmonic of a long-wavelength component and an (n-1)th higher harmonic of a short-wavelength component, obtained from optical pulses having an optical spectral band expanded by a nonlinear optical medium 106, to interfere with each other to generate an optical signal having a frequency difference between the (n)th higher harmonic and (n-1)th higher harmonic, the optical signal generated by the self-reference interferometer 107 is photoelectrically converted by an optical detector 108 to output an electric signal, and a feedback control part 109 compares the electric signal output from the optical detector 108 after the photoelectric conversion with a second signal output from a second signal generation part 103 to control a first signal generation part 102 based upon a state of the comparison so that phase noise of a first signal is suppressed.SELECTED DRAWING: Figure 1
Inventors:
ISHIZAWA ATSUSHI
HIDACHI KENICHI
NISHIKAWA TADASHI
HIDACHI KENICHI
NISHIKAWA TADASHI
Application Number:
JP2017160018A
Publication Date:
March 14, 2019
Filing Date:
August 23, 2017
Export Citation:
Assignee:
NIPPON TELEGRAPH & TELEPHONE
UNIV TOKYO DENKI
UNIV TOKYO DENKI
International Classes:
G02F1/35; G01J9/04
Domestic Patent References:
| JP2016148522A | 2016-08-18 | |||
| JP2009116242A | 2009-05-28 | |||
| JP2015200800A | 2015-11-12 | |||
| JP2015225328A | 2015-12-14 |
Foreign References:
| US20130293946A1 | 2013-11-07 | |||
| CN107065390A | 2017-08-18 |
Other References:
ISHIZAWA, A. ET AL.: "Low-phase-noise millimeter-wave signal generator assisted with frequency comb based on electro-optic", 2015 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO), vol. STh4N.6, JPN6020027231, 10 May 2014 (2014-05-10), US, pages 1 - 2, ISSN: 0004539742
ISHIZAWA, ATSUSHI ET AL.: "Phase-noise characteristics of a 25-GHz-spaced optical frequency comb based on a phase-and intensity", OPTICS EXPRESS, vol. 21, no. 24, JPN6020027234, 18 November 2013 (2013-11-18), US, pages 29186 - 29194, ISSN: 0004539743
ISHIZAWA, A. ET AL.: "Carrier-envelope-offset locking of 25-GHz EOM comb based on a free-running CW Laser Diode", 2018 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO), vol. SM4L.5, JPN6020027235, 13 May 2018 (2018-05-13), US, pages 1 - 2, XP033381910, ISSN: 0004418726
ISHIZAWA, ATSUSHI ET AL.: "Phase-noise characteristics of a 25-GHz-spaced optical frequency comb based on a phase-and intensity", OPTICS EXPRESS, vol. 21, no. 24, JPN6020027234, 18 November 2013 (2013-11-18), US, pages 29186 - 29194, ISSN: 0004539743
ISHIZAWA, A. ET AL.: "Carrier-envelope-offset locking of 25-GHz EOM comb based on a free-running CW Laser Diode", 2018 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO), vol. SM4L.5, JPN6020027235, 13 May 2018 (2018-05-13), US, pages 1 - 2, XP033381910, ISSN: 0004418726
Attorney, Agent or Firm:
Shigeki Yamakawa
Yuzo Koike
Masaki Yamakawa
Yuzo Koike
Masaki Yamakawa