SPECTRAL NOISE-ANALYSIS OF SINGLE-PASS AND DOUBLE-PASS ER3-DOPED LINBO3 WAVE-GUIDE AMPLIFIERS()

In this paper we report the derivation and evaluation of the spectral optical gain, spectral noise figure, amplified spontaneous emission ph oton number and signal-to-noise ratio in single-and double-pass config urations for an Er3+-doped LiNbO3 waveguide amplifier pumped near 1484 nm. The theoretical analysis was made using the small-gain approximat ion in the unsaturated regime. The simulations show the evolution of t he above-mentioned parameters under various pumping regimes and wavegu ide lengths. The results obtained show how the model can be used for t he design of Er3+-doped LiNbO3 waveguide amplifiers.