Flat-gain optical amplification within 70 nm wavelength band using 199 cm long hybrid erbium fibers

• Published in: Optoelectronics and Advanced Materials, Rapid Communications
• Main Author: Almukhtar A.A.; Al-Azzawi A.A.; Jusoh Z.; Razak N.F.; Reddy P.H.; Dutta D.; Das S.; Dhar A.; Paul M.C.; Ahmad H.; Yasin M.; Harun S.W.
• Format: Article
• Language: English
• Published: National Institute of Optoelectronics 2019
• Online Access: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85074346298&partnerID=40&md5=cb6facd71489fa7ced3582c2f2be9958

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. © 2019, National Institute of Optoelectronics. All rights reserved.