US 9,813,162 B2
Optical transmission circuit, optical transmission device, and optical transmission system
Koki Uchino, Tokyo (JP); Hideyuki Suzuki, Kanagawa (JP); Hiroshi Morita, Kanagawa (JP); Yoshifumi Miyajima, Kanagawa (JP); and Masatsugu Sugano, Hokkaido (JP)
Assigned to Sony Corporation, Tokyo (JP)
Filed by Sony Corporation, Tokyo (JP)
Filed on Sep. 11, 2014, as Appl. No. 14/483,758.
Claims priority of application No. 2013-213778 (JP), filed on Oct. 11, 2013.
Prior Publication US 2015/0104190 A1, Apr. 16, 2015
Int. Cl. H04B 10/58 (2013.01); H04B 10/50 (2013.01)
CPC H04B 10/58 (2013.01) [H04B 10/504 (2013.01)] 15 Claims
OG exemplary drawing
 
1. An optical transmission circuit comprising:
a driver that is controllable by data to transition a modulation current between a first level and a second level, an output terminal of the driver is configured to output the modulation current;
a constant current supply circuit configured to produce a constant current that is unchanging throughout a transmission of the data, an output terminal of the constant current supply circuit is configured to output the constant current; and
a light source configured to convert a driving current into light, the output terminal of the constant current supply circuit and the output terminal of the driver are electrically connected to an input terminal of the light source,
wherein the driver is a transistor, and
wherein a gate electrode of the transistor is configured to receive a signal output from an input buffer circuit, the signal controls the driver transition the modulation current between the first level and the second level.