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:
Sep. 01, 2026
Filed:
Sep. 06, 2022
Qudoor Technologies Inc., Beijing, CN;
QUDOOR TECHNOLOGIES INC., Beijing, CN;
Abstract
A circuit apparatus for calibrating an unequal-arm interferometer, and a quantum communication device are provided. The circuit apparatus includes: a constant-voltage power supply; a heater, provided on a short arm of the unequal-arm interferometer; and a diode, reversely connected between a positive electrode and a negative electrode of output ends of the constant-voltage power supply, and connected in series with the heater, wherein the diode provides a corresponding reverse saturation current to the heater according to a change in ambient temperature, so as to counteract an excess amount of an optical path change on a long arm of the unequal-arm interferometer under the effect of the change in the ambient temperature, relative to an optical path change on the short arm of the unequal-arm interferometer under the effect of the change in the ambient temperature.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile