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:
May. 14, 2024
Filed:
Apr. 05, 2022
Mitsubishi Electric Corporation, Tokyo, JP;
Hiroshi Miura, Tokyo, JP;
Mitsubishi Electric Corporation, Tokyo, JP;
Abstract
An optical transmission device includes: an IQ optical modulator to modulate incident light with a modulation signal, and adjust a phase of the modulated light with a phase bias, or adjust a phase of the incident light with the phase bias, and modulate the phase adjusted light with the modulation signal, a light intensity detector to detect light intensity of modulated light, a synchronous detection circuit to synchronously detect a light intensity signal and a dither signal, and a bias signal generating unit to monitor a change in amplitude of the modulation signal, generate the bias signal according to the synchronous detection signal when a range of the change is equal to or less than a first threshold, and generate a bias signal maintaining a phase bias before the range of the change becomes larger than the first threshold as the bias signal.