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:
Jan. 26, 2021
Filed:
Nov. 09, 2016
National Institute of Advanced Industrial Science and Technology, Tokyo, JP;
Ken Tanizawa, Tsukuba, JP;
Hiroyuki Matsuura, Tsukuba, JP;
Satoshi Suda, Tsukuba, JP;
Haruhiko Kuwatsuka, Tsukuba, JP;
Keijiro Suzuki, Tsukuba, JP;
Guangwei Cong, Tsukuba, JP;
Kazuhiro Ikeda, Tsukuba, JP;
Hitoshi Kawashima, Tsukuba, JP;
Shu Namiki, Tsukuba, JP;
Abstract
Provided is a driving device for PWM control of voltage pulses for controlling the temperature of a heater in a phase controller, the driving device being capable of increasing the response speed of an optical element such as an optical switch. Phase controllers include first and second heaters for changing the temperatures of first and second optical waveguides extending in parallel. Driving devices include pulse generation circuits that generate voltage pulses to apply to the first and second heaters. To start raising the temperature of the second heater, the pulse generation circuit generates a first voltage pulse and consecutive second voltage pulses to apply to the second heater with zero voltage pulse being applied to the first heater, the first voltage pulse having a long pulse width and the second voltage pulses following the first voltage pulse and having a shorter pulse width than the first voltage pulse.