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:
Jul. 29, 2025
Filed:
Dec. 01, 2020
Nippon Telegraph and Telephone Corporation, Tokyo, JP;
NIPPON TELEGRAPH AND TELEPHONE CORPORATION, Tokyo, JP;
Abstract
A depolarizer for depolarizing input light having a plurality of linearly polarized waves whose optical frequency interval is f includes: an input optical waveguide configured to propagate the input light while maintaining linear polarization; a first polarization-maintaining coupler configured to bifurcate the linearly polarized waves output from the input optical waveguide to a first arm and a second arm while maintaining a polarization state; a second polarization-maintaining coupler configured to polarization-multiplex and output the linearly polarized waves propagated through the first arm and the second arm; and a polarization-maintaining variable optical delay line arranged on at least one of the first arm or the second arm, in which the variable optical delay line is adjusted such that a difference in delay time between the linearly polarized waves propagated through the first arm and the second arm becomes close to (n+0.5)/f where n is an arbitrary integer.