Wideband and flat-gain amplifier based on high concentration erbium-doped fibres in parallel double-pass configuration

• Main Authors: Hamida, Belal Ahmed, Cheng, X.S., Harun , Sulaiman Wadi, Naji, Ahmed Wathik, Arof, Hamzah, Al-Khateeb, Wajdi Fawzi Mohammed, Khan, Sheroz, Ahmad, Harith
• Format: Article
• Language: English
• Published: Kvantovaya Elektronika and Turpion Ltd 2012
• Subjects: T Technology (General)
• Online Access: http://irep.iium.edu.my/41887/1/Wideband_and_flat-gain_amplifier_based_on_high_concentration_erbiumdoped_fibres_in_parallel_double-pass_configuration_%28_5_July_2012_%29.pdf; http://irep.iium.edu.my/41887/; http://dx.doi.org/10.1070/QE2012v042n03ABEH014696

A wideband and flat gain erbium-doped fibre amplifier (EDFA) is demonstrated using a hybrid gain medium of a zirconiabased erbium-doped fibre (Zr-EDF) and a high concentration erbium-doped fibre (EDF). The amplifier has two stages comprising a 2-m-long ZEDF and 9-m-long EDF optimised for C- and L-band operations, respectively, in a double-pass parallel configuration. A chirp fibre Bragg grating (CFBG) is used in both stages to ensure double propagation of the signal and thus to increase the attainable gain in both C- and L-band regions. At an input signal power of 0 dBm, a flat gain of 15 dB is achieved with a gain variation of less than 0.5 dB within a wide wavelength range from 1530 to 1605 nm. The corresponding noise figure varies from 6.2 to 10.8 dB within this wavelength region.