PRINCIPLES OF A FSK OPTICAL MODEM DESIGNED WITH VOLTAGE-FREQUENCY AND FREQUENCY-VOLTAGE CONVERTER INTEGRATED CIRCUITS
PAMUKKALE UNIVERSITY JOURNAL OF ENGINEERING SCIENCES-PAMUKKALE UNIVERSITESI MUHENDISLIK BILIMLERI DERGISI, vol.21, no.2, pp.37-40, 2015 (ESCI, TRDizin)
- Publication Type: Article / Article
- Volume: 21 Issue: 2
- Publication Date: 2015
- Doi Number: 10.5505/pajes.2014.26349
- Journal Name: PAMUKKALE UNIVERSITY JOURNAL OF ENGINEERING SCIENCES-PAMUKKALE UNIVERSITESI MUHENDISLIK BILIMLERI DERGISI
- Journal Indexes: Emerging Sources Citation Index (ESCI), TR DİZİN (ULAKBİM)
- Page Numbers: pp.37-40
- Bursa Uludag University Affiliated: Yes
Abstract
In this study the principles of a frequency shift keying optical MODEM design have been investigated. In this MODEM modulated digital data has been transmitted between transmitter and receiver via light in the free space. An infrared LED light has been modulated by FSK modulated signal at the transmitter and this modulated light has been converted to an electrical signal using a photo detector at the receiver end. The communication distance depends on both LED's radiant power and photo detector sensitivity. In many available applications the photo detector sensitivity and receiver gain have been increased to increase communication distance. In this study LED's radiant power has been increased rather than photo detector sensitivity. Beside of increasing communication distance the background noise effect has been decreased by driving LEDs with pulsed high currents.