Title :
Distortion and noise properties of a praseodymium-doped fluoride fiber amplifier in 1.3 /spl mu/m AM-SCM video transmission systems
Author :
Kikushima, Koji ; Yamada, Makoto ; Shimizu, Makoto ; Temmyo, Jiro
Author_Institution :
NTT Transmission Syst. Labs., Kanagawa, Japan
fDate :
3/1/1994 12:00:00 AM
Abstract :
The distortion and noise of a praseodymium-doped fluoride fiber amplifier (PDFA) are measured in two 40-channel AM-SCM video transmission systems. While it is already known that with direct modulation a PDFA leads to increased composite second-order distortion (CSO) and cross-modulation distortion (XM), this letter introduces an external modulation scheme that completely eliminates both problems. One PDFA is examined and found to yield low distortion and high CNR, but this is offset by a low-frequency noise. This noise is significant and the resulting picture quality is "annoying" in subjective tests.<>
Keywords :
amplitude modulation; fibre lasers; optical communication equipment; optical modulation; praseodymium; subcarrier multiplexing; television networks; 1.3 /spl mu/m AM-SCM video transmission systems; 40-channel AM-SCM video transmission systems; IR; PDFA; Pr-doped fluoride fiber amplifier; composite second-order distortion; cross-modulation distortion; direct modulation; external modulation scheme; fibre laser distortion; high CNR; low distortion; low-frequency noise; noise properties; picture quality; praseodymium-doped fluoride fiber amplifier; Chirp modulation; Degradation; Distortion measurement; Frequency; Laboratories; Low-frequency noise; Optical distortion; Optical fiber amplifiers; Optical fiber polarization; Optical modulation;
Journal_Title :
Photonics Technology Letters, IEEE
