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<title>Modeling of optical amplification on dopant concentration in the bent Er-doped LiNbO waveguide of the Mach-Zehnder interferometer</title>

2004; SPIE; Linguagem: Inglês

10.1117/12.583040

1996-756X

George Vâlceanu, Niculae N. Puşcaş, Adrian N. Ducariu, Emil Smeu, I. Popescu,

Advanced Photonic Communication Systems

In the last years the Er-doped LiNbO optical waveguides are widely used for the fabrication of integrated optical components. We report some original results concerning the evaluation of the spectral optical gain, spectral noise figure and spectral signal-to-noise ratio in the bent Er-doped LiNbO waveguide of the Mach-Zehnder interferometer pumped near 1484 nm using erfc, Gaussian and constant profile of the Er ions in LiNbO crystal. Our model is based on a quasi-two-level system and the small gain approximation in the unsaturated regime in order to simulate the optical amplification in Er-doped LiNbO straight and bent waveguide amplifiers and we demonstrated that rather high gains (~1.5 dB), low noise figures (~3.5 dB) and good signal-to-noise ratios (~56.5) at the end of the bent arm of the integrated Mach-Zehnder interferometer are achievable for 70 mW input pump power. The obtained results can be used for the design of the integrated optical circuits, Mach-Zehnder interferometers which can be utilized for example for the precise measurement of the displacements, seismic motions, etc.