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Gain-flattened hybrid EDFA operating in C + L band with parallel pumping distribution technique
IET Optoelectronics  (IF1.636),  Pub Date : 2020-10-28, DOI: 10.1049/iet-opt.2020.0072
Alabbas A. Al-Azzawi, Aya A. Almukhtar, Anirban Dhar, Mukul C. Paul, Harith Ahmad, Ahmet Altuncu, Retna Apsari, Sulaiman Wadi Harun

A novel C + L band hybrid erbium-doped fibre amplifier (EDFA) using a two-stage configuration was proposed and demonstrated experimentally. The amplifier is composed of a 0.5-m long hafnium bismuth erbium co-doped fibre (EDF) to provide gain within the C-band and a 4-m long zirconia-based EDF to provide gain within the L-band. The proposed amplifier was examined based on the multi-wavelength input source. A parallel pumping distribution technique was used to mitigate the amplifier complexity. The C + L band amplifier achieved a gain flattening of over 55 nm bandwidth for the three levels of the input powers. A gain-flattening of roughly 10.9, 15.5, and 19.2 dB were obtained, respectively, for the input signal powers of −5, −10, and −15 dBm. An average noise figure of 6.4, 5.4, and 4.7 dB was achieved, respectively, for the input signal powers of −5, −10, and −15 dBm.