Optimization of Er and Er-Yb doped gain fiber amplifiers for reduced amplified spontaneous emission content

Date

2024-8

Author

Sungur, Ece İlkay

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Fiber-optic technology revolutionizes modern information transmission, enabling data transmission over extended distances with higher bandwidth than traditional methods in engineering and scientific fields. Moreover, their immunity to electromagnetic interference (EMI) ensures superior transmission quality, a significant advantage over electrical cables. Erbium (Er) is a prominent dopant in fiber optic technology, particularly in amplifier applications, where it stimulates emission, a crucial process in signal amplification. This thesis focuses on developing a comprehensive understanding of these systems through numerical and analytical approaches. Numerical modeling of rate equations are employed to study the behavior of erbium-doped gain fibers. The theoretical findings from these studies were validated through experimental investigations. In the scope of this thesis, a simulation model for continuous wave (CW) Er-Yb (Erbium–Ytterbium) co-doped fiber amplifiers was performed. This model enables the calculation of the fraction of amplified spontaneous emission (ASE), a critical parameter in amplifier performance. Simulation results have shown promising outcomes, indicating that high output power at 1550 nm with minimal ASE (approximately 0.7\%) can be achieved using shallow, milliwatt-level seed signals in a single amplification stage. In addition to the primary study, the effects of multiple passes through a shorter gain fiber as an alternative to using a long gain medium, with a focus on ASE levels was investigated with developed nanosecond (ns) pulse laser. This technique allows for efficient energy extraction while potentially reducing the overall ASE levels compared to a single-pass configuration with a longer gain medium.

Subject Keywords

Er-Yb fiber amplifier, fiber laser, numerical simulation, ASE

URI

https://hdl.handle.net/11511/111311

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Graduate School of Natural and Applied Sciences, Thesis