Title :
Directly modulated CATV transmission systems using half-split-band and wavelength-division-multiplexing techniques
Author :
Lu, Hai-Han ; Lee, Ching-Ting
Author_Institution :
Inst. of Opt. Sci., Nat. Central Univ., Chung-Li, Taiwan
Abstract :
We present a directly modulated NTSC AM-VSB 80-channel fiber optical CATV long-distance (over 80 km) transmission systems by using 1550-nm digital distributed-feedback laser diodes, half-split-band, wavelength division multiplexing and erbium-doped fiber amplifier-repeated techniques. Good performances of carrier-to-noise ratio (/spl ges/50 dB), composite second-order (/spl ges/68 dB), and composite triple beat (/spl ges/63 dB) are obtained after 80-km standard single-mode fiber transmission. The proposed directly modulated transmission systems are simpler and lower cost than conventional externally modulated transmission systems.
Keywords :
amplitude modulation; cable television; distributed feedback lasers; electro-optical modulation; laser noise; optical fibre subscriber loops; semiconductor lasers; wavelength division multiplexing; 1550 nm; 80 km; carrier-to-noise ratio; composite second-order beat; composite triple beat; digital distributed-feedback laser diodes; directly modulated CATV transmission systems; directly modulated NTSC AM-VSB 80-channel fiber optical CATV long-distance transmission systems; directly modulated transmission systems; erbium-doped fiber amplifier-repeated techniques; externally modulated transmission systems; half-split-band multiplexing techniques; standard single-mode fiber transmission; wavelength-division-multiplexing techniques; Digital modulation; Diode lasers; Distributed amplifiers; Erbium-doped fiber amplifier; Optical fiber amplifiers; Optical fibers; Optical modulation; Semiconductor optical amplifiers; Stimulated emission; Wavelength division multiplexing;
Journal_Title :
Photonics Technology Letters, IEEE
