Title:
OPTICAL SPECTRAL LINE WIDTH CALCULATION METHOD, DEVICE, AND PROGRAM
Document Type and Number:
WIPO Patent Application WO/2019/198485
Kind Code:
A1
Abstract:
Provided are an optical spectral line width calculation method, a device, and a program, whereby the spectral line width of a laser to be measured can be calculated from an optical interference signal generated by an optical interferometer having a delay line, said calculation being made on the basis of the phase difference of an optical interference signal having a longer delay time than the delay time caused by the delay line. The optical spectral line width measurement device 500 comprises: a Mach-Zehnder interferometer 510; a light receiver 520 that receives optical interference signals emitted from the Mach-Zehnder interferometer 510; an A/D converter 530 that converts analog electrical signals output by the light receiver 520 into digital electrical signals; and an arithmetic processing device 540 that processes digital electrical signals. The interferometer 510 has an optical delay fiber 511 provided upon one arm waveguide and has an optical frequency shifter 512 provided upon the other arm waveguide. Two beams of light having a mutual delay difference τ are generated from the light emitted from the laser 200 to be measured; these are combined; and an optical interference signal is generated.
Inventors:
ONO SHINGO (JP)
TOGE KUNIHIRO (JP)
MANABE TETSUYA (JP)
TOGE KUNIHIRO (JP)
MANABE TETSUYA (JP)
Application Number:
PCT/JP2019/012720
Publication Date:
October 17, 2019
Filing Date:
March 26, 2019
Export Citation:
Assignee:
NIPPON TELEGRAPH & TELEPHONE (JP)
International Classes:
G01J9/04
Foreign References:
JP2011242345A | 2011-12-01 | |||
US20100097615A1 | 2010-04-22 | |||
JPH0712679A | 1995-01-17 | |||
JPH0694541A | 1994-04-05 | |||
JPH03257336A | 1991-11-15 | |||
JPH02247531A | 1990-10-03 | |||
JPS63157023A | 1988-06-30 |
Other References:
HONDA, KATSUHISA: "Application of acoustooptic device to a measuring instrument", OPTICAL ALLIANCE, vol. 3, no. 11, 1 November 1992 (1992-11-01), pages 27 - 30
TSUCHIDA, HIDEMI: "Analysis and improvement of a resolving power of the delay self heterodyne method", DOCUMENTS OF RESEARCH GROUP OF THE INSTITUTE OF ELECTRICAL ENGINEERING OF JAPAN, 2 November 1989 (1989-11-02), pages 19 - 28
OKOSHI, T. ET AL.: "Novel method for high resolution measurement of Laser output spectrum", ELECTRONICS LETTERS, vol. 16, no. 16, 31 July 1980 (1980-07-31), pages 630 - 631, XP055642754
TSUCHIDA, HIDEMI: "Analysis and improvement of a resolving power of the delay self heterodyne method", DOCUMENTS OF RESEARCH GROUP OF THE INSTITUTE OF ELECTRICAL ENGINEERING OF JAPAN, 2 November 1989 (1989-11-02), pages 19 - 28
OKOSHI, T. ET AL.: "Novel method for high resolution measurement of Laser output spectrum", ELECTRONICS LETTERS, vol. 16, no. 16, 31 July 1980 (1980-07-31), pages 630 - 631, XP055642754
Attorney, Agent or Firm:
TANI & ABE, P.C. (JP)
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