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A flat-gain amplification covering a wideband wavelength window was accomplished by using dual-stage erbium doped fiber amplifier (EDFA). The amplifier was constructed by combining two different active fibers; Bismuth erbium doped fiber (Bi-EDF) and Hafnium-bismuth erbium doped fiber (HB-EDF) that provide amplification in C- and L-band region, respectively. It employed only 199 cm of the total active fibers in double-pass parallel configuration. The 1480 nm pump powers were fixed at 90 and 170 mW for first and second stages, respectively. At input signal power of -30 dBm, the gain of the amplifier varied from 13 to 27 dB within a wavelength region from 1535 to 1590 nm. At input signal power of -10 dB, a flat gain of about 14 dB was realized with gain fluctuation less than 1 dB over 70 nm wavelengths from 1535 to 1605 nm. On the other hand, the corresponding noise figures were maintained below 13 dB over wideband region for both input signal powers..
Wideband optical amplifier, Erbium-doped fiber amplifier, Hafnium Bismuth Erbium co-doped fiber.
A. A. ALMUKHTAR, A. A. AL-AZZAWI, Z. JUSOH, N. F. RAZAK, P. H. REDDY, D. DUTTA, S. DAS, A. DHAR, M. C. PAUL, H. AHMAD, M. YASIN, S. W. HARUN, Flat-gain optical amplification within 70 nm wavelength band using 199 cm long hybrid erbium fibers, Optoelectronics and Advanced Materials - Rapid Communications, 13, 7-8, July-August 2019, pp.391-395 (2019).
Submitted at: Nov. 21, 2018
Accepted at: Aug. 20, 2019