Abstract
We present a numerical analysis of noise performance improvement of the erbium-doped fiber amplifier by flatting the mode field intensity distribution within the interaction region of erbium ions. Three different refractive index types of erbium-doped fiber were used to study the effect of the pump mode intensity distribution on noise performance. The results show that taking advantage of the depressed refractive index erbium-doped fiber which has a flat mode distribution in the fiber core, the maximum reduction of nearly 0.53 dB for noise figure was achieved across the full C-band. Based on the center depressed refractive index profile, the noise figure was further decreased by about 0.1 dB by reducing the doping radius to 0.71 μm. Finally, maintaining the same gain level of ∼38.3 dB, a NF reduction of ∼0.63 dB was realized by introducing the center depressed refractive index profile and narrowing the erbium doping region. It is suggested that our investigation shows great potential for improving the noise performance of the erbium-doped fiber amplifier.
Highlights
T HE emergence of the erbium-doped fiber amplifier (EDFA) represents a milestone in the history of optical fiber communication, which promoted the application of dense wavelength division multiplexer (DWDM) technology
We report a numerical analysis of noise performance improvement of the EDFA by regulating the refractive index profile to flatten the mode field intensity and adjusting the erbium-doped radius
We present a numerical analysis of noise performance improvement of the erbium-doped fiber amplifier by flatting the pump mode field intensity distribution and tailoring the erbium doping profile of the fiber core
Summary
T HE emergence of the erbium-doped fiber amplifier (EDFA) represents a milestone in the history of optical fiber communication, which promoted the application of dense wavelength division multiplexer (DWDM) technology. The ASE in the same frequency range as the signal is the main noise source of the amplifier, which cannot be removed even with a filter. A novel selfgenerated signal seed utilizing a gain-clamped amplifier was studied to reduce the pump-to-ASE losses for L-band [10]. The noise characteristics optimization methods mentioned above are mainly based on adjusting the configuration of EDFA, which usually lose a certain gain efficiency for guaranteeing the low NF. We report a numerical analysis of noise performance improvement of the EDFA by regulating the refractive index profile to flatten the mode field intensity and adjusting the erbium-doped radius. Three different refractive index types of erbium-doped fiber are the depressed refractive index profile, raised refractive index profile and step-index profile respectively, which were used to study the effect of pump mode intensity distribution on noise performance. The influence of erbium ions doping radius is studied based on the depressed refractive index profile
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