Title:
TUNABLE LASER
Document Type and Number:
WIPO Patent Application WO/2020/145174
Kind Code:
A1
Abstract:
A tunable laser that can improve finesse and achieves favorable filter characteristics. A tunable laser that has a filter region that has a wavelength selection function for light from a gain region. The filter region is a Sagnac interferometer and includes two ring oscillators (500). The ring oscillators have two optical couplers (50, 51) and first and second curved waveguides (56, 57) that are the same length and connect the two optical couplers. Each of the two optical couplers is configured such that light from the gain region is inputted from an input/output port (52, 53), light that is at a resonant peak is coupled at a bar port (54, 55) of the input/output port, and light that is not at the resonant peak wavelength is coupled at a cross port (58, 59) of the input/output port. The first curved waveguide connects the bar ports of the input/output ports of the two optical couplers, and the second curved waveguide connects cross ports of the ports of the two optical couplers to which the first curved waveguide is connected.
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Inventors:
MURANAKA YUSUKE (JP)
MATSUO SHINJI (JP)
NUNOYA NOBUHIRO (JP)
HASHIMOTO TOSHIKAZU (JP)
MATSUO SHINJI (JP)
NUNOYA NOBUHIRO (JP)
HASHIMOTO TOSHIKAZU (JP)
Application Number:
PCT/JP2019/051062
Publication Date:
July 16, 2020
Filing Date:
December 26, 2019
Export Citation:
Assignee:
NIPPON TELEGRAPH & TELEPHONE (JP)
International Classes:
G02B6/293; H01S3/083; H01S5/026; H01S5/0687; H01S5/14
Foreign References:
| JP2013093627A | 2013-05-16 |
Attorney, Agent or Firm:
TANI & ABE, P.C. (JP)
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