In Erbium Doped Fiber Amplifier, there are basically two main techniques for gain flattening: one is use external wavelength filters to flattenedthe gain while the other one relies on modifying the amplifying fiber properties to flatten the gain spectrum. The paper presents the study of simulation of a gain flattened EDFA WDM network for L-band optical communication using a Wavelength Selective Attenuator. The design provides a high gain of 34.63dB at 1593nm and gain flatness (P-P) 0.38dB by using a wavelength selective attenuator in the entire L-band at room temperature. Very promisingly, a noise figure of less than 11dB was found in the entire 37nm (1571nm-1608nm) region. The variation has also been studied for various values of fiber length and pump power.
Abstract-Optical amplification in the C and L band region with wave division multiplexing can provide over 160 channels. The paper provides simulation studies of such a wideband erbium doped fiber amplifier which utilizes a tunable tap at the TLS source end. This isolates and provides two parallel channels for simultaneous amplification in both C and L band. Such a configuration has shown to provide a gain well over 20dB from 1525-1615nm bandwidth with an average noise figure of 10dB (approx.). Gain saturation effects beyond20dBm/channel signal level and, gain spectra at different pump powers and amplifier lengths have also been studied.
In an Erbium Doped Fiber Amplifier the gain and noise figure are strongly dependent on fiber length. This paper presents simulative studies on Length Dependent Gain and Noise Figure Analysis in a Dual Stage L-Band EDF A WDM Network. A high gain of 42dB was obtained at 1562nm wavelength with a total EDF (EDF-I 5m and EDF-II 5m) length of 10m and total pump power (980nm pump and 1480nm pump) of 270mW. Low noise figure of less than 4.7dB occurs in the entire wavelength range (1561nm-1617nm). A high Power Conversion Efficiency of 48% and Quantum Conversion Efficiency of 60% has been obtained. This paper also studies the variation of gain and noise figure with varying temperature and fiber length. The configuration discussed in this capable of successfully implemented for L band amplification with high gain and low noise figure.
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