Gain improvement in L-band EDFA using unpumped EDF in a double pass system (original) (raw)
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Laser Physics, 2008
Gain and noise figure improvements are demonstrated in a shorter wavelength region of a double-pass EDFA using a macrobending approach. The EDF is wound in a small radius to suppress the amplified spontaneous emission at the longer wavelength in order to achieve a high amplification in the shorter wavelength. Gain enhancements of about 12–14 dB are obtained with macrobending at the wavelength region between 1480 and 1530 nm. The macrobending also reduces the noise figure of the EDFA at wavelengths shorter than 1525 nm with a maximum improvement of 25 dB.
An EDFA Theoretical Analysis Considering Different Configurations and Pumping Wavelengths
The propagation behavior of erbium-doped fiber amplifier parameters is theoretically analyzed in this work for different amplifier configurations and pumping wavelengths. These configurations were devised from the basic amplifier arrangement and developed to improve specific amplifier operational characteristics. By using the amplifier basic theory for pumping at 980 and 1,480 nm, the configurations were modeled and simulated for given input boundary conditions. As a result, the longitudinal characteristics of signal, pumping, spontaneous emission, and noise figure were observed for all configurations and compared to those of the conventional amplifier. All simulations were carried out using parameters from a commercial erbium-doped fiber.