US 11,934,012 B2
Optical adjustment apparatus, optical adjustment method, and optical device
Tomotaka Furuta, Osaka (JP); Junichi Kamatani, Nara (JP); and Tatsuro Shiraishi, Osaka (JP)
Assigned to PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD., Osaka (JP)
Filed by Panasonic Intellectual Property Management Co., Ltd., Osaka (JP)
Filed on Apr. 19, 2022, as Appl. No. 17/723,529.
Claims priority of application No. 2021-083303 (JP), filed on May 17, 2021.
Prior Publication US 2022/0365287 A1, Nov. 17, 2022
Int. Cl. G02B 6/30 (2006.01); G02B 6/36 (2006.01); G02B 6/42 (2006.01); F21V 8/00 (2006.01)
CPC G02B 6/30 (2013.01) [G02B 6/3636 (2013.01); G02B 6/422 (2013.01); G02B 6/4227 (2013.01); G02B 6/0008 (2013.01)] 13 Claims
OG exemplary drawing
 
1. An optical adjustment apparatus for use in coupling a first optical fiber to an optical substrate being a coupling destination, the first optical fiber having an exit-side end portion, the optical substrate having a substrate-end surface, the optical adjustment apparatus comprising:
a measurement-light irradiation part including
a plurality of second optical fibers having exit-side end portions,
the measurement-light irradiation part being configured to emit a plurality of lights with respective timings different from each other via the plurality of second optical fibers, the plurality of lights having a single wavelength;
an optical fiber block configured to hold the exit-side end portion of the first optical fiber and the exit-side end portions of the plurality of second optical fibers, the optical fiber block having a block-end surface;
a light detection part configured to receive and detect a plurality of reflected lights via the plurality of second optical fibers, the plurality of reflected lights being reflected off the substrate-end surface of the optical substrate and corresponding to the plurality of lights;
a tilt calculation part configured to compare, with each other, variations with time of intensities of the plurality of respective reflected lights and to calculate a tilt of the optical fiber block relative to the optical substrate based on a result of the comparison of the variations with time; and
a distance calculation part configured to calculate an inter-end surface distance between the substrate-end surface of the optical substrate and the block-end surface of the optical fiber block, based on a variation with time of an intensity of at least one of the plurality of reflected lights.