Project brief
This simulation study examines a forward-pumped erbium-doped fiber amplifier using the physical EDF component in OptiSystem. A 1550 nm continuous-wave signal and a 980 nm pump feed the active fiber, with isolators, power meters, spectrum analyzers and a dual-port WDM analyzer supporting validation. The reference condition uses a 100 mW pump and 5 m of active fiber. From that baseline, native parameter sweeps vary pump power over 18 valid settings and fiber length over 15 settings, while keeping the other parameter fixed. Gain, noise figure and signal-only output power provide complementary measures of performance. The pump sweep shows diminishing gain returns as power increases. The length sweep produces a clear sampled maximum at 9 m, while 8 m preserves almost all of that gain with a lower noise figure. Spectral evidence separates the useful optical carrier from amplified spontaneous emission and residual pump energy. Numerical consistency checks link input power, gain and output power; unstable low-pump results are explicitly excluded. The result is a traceable engineering comparison of operating points, with conclusions confined to the simulated range.
The engineering challenge
Distinguish useful amplified signal from residual pump and broadband noise, then find a practical gain/noise compromise while excluding numerically invalid sweep results.
Engineering approach
- Build a physical forward-pumped EDF layout with separate signal and diagnostic outputs.
- Validate the 100 mW, 5 m reference condition using spectra, gain and signal-power consistency.
- Run native pump-power and active-length sweeps using fixed analyzer settings.
- Exclude unstable 10 and 20 mW cases instead of replacing them with invented values.
- Compare gain, noise figure and nominal signal output to assess competing operating points.
Results & observations
100 mW pump, 5 m active EDF; reported noise figure 5.274 dB.
Highest sampled gain at 9 m and 100 mW; noise figure 8.831 dB.
8 m versus 9 m, with only 0.010 dB less gain in the reported sweep.
200 mW at 5 m; a tested boundary rather than a global optimum.
Features & capabilities
- Physical erbium-fiber model
- Native parameter sweeps
- Dual-port signal analysis
- Optical spectrum inspection
- Numerical consistency checks
- Gain–noise tradeoff assessment
Software & engineering tools
OptiSystem 7.0, Physical Erbium Doped Fiber component, WDM Analyzer, Optical Spectrum Analyzer