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:
Oct. 06, 2026
Filed:
Oct. 13, 2020
Ntt, Inc., Tokyo, JP;
Yuta Ueda, Musashino, JP;
Yusuke Saito, Musashino, JP;
NTT, Inc., Tokyo, JP;
Abstract
In the wavelength variable light source and its control method of the present disclosure, intensity of oscillation light in a plurality of non-operating ports of MMI is utilized in consideration of filter characteristics between an operating port and a non-operating port that does not directly contribute to oscillation operation. By controlling the RTF laser so that the light intensity of the wavelength of the oscillation light in the monitored non-operation port is in a desired relationship, a wavelength variable light source reflecting SMSR characteristics is realized. The SMSR can be effectively controlled only by adding a photodetector to a non-operation port which has not been considered by the RTF laser of the prior art. In the wavelength variable light source, the inspection of the SMSR and the SMSR monitor during actual operation can be realized by a simple mechanism.