US 12,266,900 B2
Light source device for fiber optic gyroscope and fiber optic gyroscope using the same
Mikio Kozuma, Tokyo (JP)
Assigned to INSTITUTE OF SCIENCE TOKYO, Tokyo (JP)
Appl. No. 17/786,646
Filed by TOKYO INSTITUTE OF TECHNOLOGY, Tokyo (JP)
PCT Filed Nov. 19, 2020, PCT No. PCT/JP2020/043273
§ 371(c)(1), (2) Date Jun. 17, 2022,
PCT Pub. No. WO2021/124790, PCT Pub. Date Jun. 24, 2021.
Claims priority of application No. 2019-230925 (JP), filed on Dec. 20, 2019.
Prior Publication US 2023/0030335 A1, Feb. 2, 2023
Int. Cl. H01S 3/13 (2006.01); G01C 19/72 (2006.01); G02F 1/37 (2006.01); G02F 1/39 (2006.01); H01S 5/0687 (2006.01)
CPC H01S 3/1303 (2013.01) [G01C 19/721 (2013.01); G02F 1/39 (2013.01); H01S 5/0687 (2013.01); G02F 1/37 (2013.01); G02F 2203/56 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A light source device for a fiber optic gyroscope configured to drive a fiber optic gyroscope having a fiber optic coil, the light source device comprising:
a laser light source that emits a laser light of a predetermined frequency;
a stabilizing part that stabilizes the predetermined frequency of the laser light emitted from the laser light source; and
a bandwidth broadening part that includes an optical comb generation part and a white noise modulation part and that makes the laser light stabilized by the stabilizing part into a light having a continuous broadband spectrum, the optical comb generation part to which the laser light stabilized by the stabilizing part is inputted and which emits a light having a plurality of spectra equally spaced at predetermined intervals with a predetermined frequency as a center, and the white noise modulation part to which the light emitted from the optical comb generation part is inputted and which performs frequency modulation using white noise for making a continuous spectrum with a modulation width equal to or more than a predetermined interval of a plurality of spectra.