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. 31, 2005
Filed:
Feb. 11, 2002
Shigeru Tokita, Yokohama, JP;
Atsushi Hasegawa, Yokohama, JP;
Takahiro Hamagishi, Yokohama, JP;
OpNext Japan, Inc., Kanagawa-ken, JP;
Abstract
An optical transmitter for use in an optical transmitting system based on PDS (Passive Double Star) technology, does not erroneously output an optical signal when the optical transmitter is powered on/off. The optical transmitter has a current sourcefor outputting a drive current having a magnitude corresponding to an input control signal, a Laser diode (LD) for generating an optical output signal based on the received drive current, a modulatorfor controlling the supply and cutoff of the drive current to the Laser diode (LD), a source voltage detectorfor monitoring a source voltage to detect whether the source voltage is lower than a predetermined voltage, and a switch circuitfor outputting a control signal to the current sourceto stop the supply of the drive current when the source voltage is determined to be lower than the predetermined voltage.