The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 08, 2023
Filed:
Jul. 20, 2021
Nippon Telegraph and Telephone Corporation, Tokyo, JP;
Masahiro Ueno, Atsugi, JP;
Meishin Chin, Atsugi, JP;
Shoko Tatsumi, Atsugi, JP;
Takashi Sakamoto, Atsugi, JP;
Yuzo Sasaki, Atsugi, JP;
Seiji Toyoda, Atsugi, JP;
Yuichi Akage, Isehara, JP;
Joji Yamaguchi, Atsugi, JP;
Tadashi Sakamoto, Atsugi, JP;
Nippon Telegraph and Telephone Corporation, Tokyo, JP;
Abstract
A swept light source of the present invention keeps a coherence length of an output beam long over an entire sweep wavelength range. A gain of a gain medium is changed with time in response to a wavelength sweep and the coherence length is kept maximum. The gain of the gain medium is kept close to a lasing threshold and an unsaturated gain range of the gain medium is narrowed over the entire sweep wavelength range. An SOA current waveform data acquiring method of driving while keeping the coherence length long, a novel coherence length measuring method, and an optical deflector suitable for the swept light source are also disclosed.