Comparison of performances between partial double-pass and full double-pass systems in two-stage L-band EDFA

✍ Scribed by N. Md Samsuri; S. W. Harun; H. Ahmad

• Publisher: John Wiley and Sons
• Year: 2004
• Tongue: English
• Weight: 83 KB
• Volume: 1
• Category: Article
• ISSN: 1612-2011
• DOI: 10.1002/lapl.200410116

✦ Synopsis

The two-stage L-band EDFA with partial double-pass (DP)
system is compared with the full DP system. The partial DP system
has a higher gain and lower noise figure at small input signal
power compared with the full DP system. The small signal gain and
noise figure are obtained at about 31.2 dB and 6.2 dB,
respectively, for the partial DP system. The reduction of gain in
full DP system is due to the double-propagation of
conventional-band amplified spontaneous emission in the short
length erbium-doped fiber at the first stage that causes
gain-clamping effect to the system. The higher gain in the partial
DP system contributes to the lower noise figure even compared with
single-pass two-stage system at small input signal powers.
However, at high input signal powers, the lowest noise figure is
observed for the single-pass system.