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Simultaneous modulation of digital/SCM signal using a single LD for broadcasting in PON based optical access network  

Kim Tae-Young (Dept. of Electrical and Electronic Eng., Yonsei Univ.)
Kim Kyung-Hyun (Dept. of Electrical and Electronic Eng., Yonsei Univ.)
Han Sang-Kook (Dept. of Electrical and Electronic Eng., Yonsei Univ.)
Publication Information
Journal of the Institute of Electronics Engineers of Korea TC / v.43, no.5, 2006 , pp. 1-6 More about this Journal
Abstract
By comparing video-overlay method where digital and SCM signal are modulated in different optical source, we experimentally investigated the performance of simultaneous modulation of data and broadcasting signals using a single LD for broadcasting in PON based optical access network. The experimental results show that by increasing the minimum value of injected current for LD modulation above about 1.5 times of threshold current of LD, data and broadcasting signals can modulate without mutual interference. We also proposed and demonstrated the scheme of optical transmitter optimized for simultaneous modulation of data and broadcasting signals where anode and cathode of LD are separately used as signal interface for data and broadcasting signals, respectively.
Keywords
passive optical network; broadcasting; optical transmitter;
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