Abstract
This study presents a directly modulated NTSC AM-VSB 74-channel bi-directional fiber optical CATV long-distance (over 110 km) transmission system in the 1550 nm region which used high power 1550 nm digital distributed feedback (DFB) laser diode (20 mW), inline erbium-doped fiber amplifiers (EDFAs), one channel transmission and superheterodyne techniques. Good carrier-to-noise ratio (CNR) of ≥ 50 dB, composite second order (CSO) of ≥ 70 dB and composite triple beat (CTB) of > 64 dB were obtained after 110 km of standard single mode fiber (SMF) transmission.
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