Abstract
We analyze and establish a CNR theory in the new optical transmission systems employing the super wide-band FM technique, which realizes multichannel video distribution over optical access networks. We also report the transmission characteristics of the developed analog/digital hybrid transmission equipment. CNR characteristics are severely affected by several key factors: a remaining AM component generated in an optical heterodyne circuit, harmonic distortions of the wide-band FM signal, a remaining FM spectrum output from the FM demodulator, and the bandwidth limitation to the FM signal. Our novel CNR theory, which takes these factors into account, can effectively explain the experimental CNR characteristics. The AM 40ch/64QAM 30-carrier hybrid optical transmission equipment, with a design based on our CNR theory, has been successfully demonstrated with CNRs of more than 43 dB in all AM channels and CNRs of more than 33 dB in all 64QAM channels. © 2000 Scripta Technica, Electron Comm Jpn Pt 1, 83(7): 50–60, 2000
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
