DocumentCode :
2676833
Title :
High-speed LED driver for visible light communications with drawing-out of remaining carrier
Author :
Tanaka, Hiroyuki ; Umeda, Yohtaro ; Takyu, Osamu
Author_Institution :
Dept. of Electr. Eng., Tokyo Univ. of Sci., Noda, Japan
fYear :
2011
fDate :
16-19 Jan. 2011
Firstpage :
295
Lastpage :
298
Abstract :
The visible light communications that communicates by modulating the light of illumination, which is the existing infrastructure, attracts attention. So as to improve the speed, to increase the bandwidth, and to miniaturize hardware of this communication system, improvement in the transmission speed by a single LED for lighting is important. The transmission speed of an LED is greatly restricted by the carrier that remains in junction capacity. Therefore, the transmission speed can be increased by drawing out the remaining carrier. We proposed and applied the carrier drawing-out circuit to the driver circuit that drives a blue LED. An optical measurement shows that the fall time decreases from 56 to 10 ns (decreases to one fifth), and the horizontal eye opening ratio has been improved from 29% to 61% (increases to 213%) for 50 Mb/s PRBS.
Keywords :
driver circuits; light emitting diodes; optical communication; optical modulation; carrier drawing-out circuit; driver circuit; high-speed LED driver; horizontal eye opening ratio; illumination light modulation; junction capacity; optical measurement; time 56 ns to 10 ns; transmission speed; visible light communications; Current measurement; Driver circuits; Frequency measurement; Frequency modulation; Light emitting diodes; Optical device fabrication; Optical variables measurement; driver circuits; light-emitting diodes; optical communication;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Radio and Wireless Symposium (RWS), 2011 IEEE
Conference_Location :
Phoenix, AZ
Print_ISBN :
978-1-4244-7687-9
Type :
conf
DOI :
10.1109/RWS.2011.5725444
Filename :
5725444
Link To Document :
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