T. Subramaniam et al., All-optical gain-clamped erbium-doped fiber-ring lasing amplifier with laser filtering technique, IEEE PHOTON, 13(8), 2001, pp. 785-787
A unique laser filtering technique of a gain-clamped erbium-doped fiber amp
lifier based on ring-laser cavity is demonstrated. The filtering mechanism
is achieved using a single fiber Bragg-grating, which also functions as a l
aser feedback reflector at the output end of the amplifier. This new design
has low noise and most important, shows up to 98% reduction in output lase
r intensity as compared with a previous design studied earlier. An optimum
result with gain and noise around 25 and 3.5 dB, respectively, obtained for
a dynamic range of input signal power up to -8 dBm.