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. 23, 2019
Filed:
Jul. 10, 2018
Shimadzu Corporation, Nishinokyo-Kuwabaracho, Nakagyo-ku, Kyoto-shi, Kyoto, JP;
SHIMADZU CORPORATION, Kyoto, JP;
Abstract
The semiconductor laser driving circuit that controls an overshoot on modulation includes a semiconductor laser, of which anode is connected to a power source, that emits the laser light that is modulated by an external modulation input signal, an impedance element connected to a cathode of the laser device, an impedance element connected to the anode, and a collector of a transistor Q, connected to the impedance element; a collector of a transistor Q, connected to the other end of the impedance element, a differential pair circuit to which emitters of Q, Qare connected; an electric current source iMOD connected to the emitters of Q, Q; and a differential driver that generates a differential voltage (vb−vb) that controls Q, Qby driving Qby the external modulation input signal, wherein the differential driver controls the differential voltage so that the amplitude of the overshoot of the electric current, which flows in the laser when the output of the laser is at a high-level.