L-band erbium-doped fibre amplifier with clamped- and flattened-gain using FBG

• Main Authors: Harun, Sulaiman Wadi, Ahmad, Harith
• Format: Article
• Published: Institution of Engineering and Technology 2003
• Subjects: Q Science (General); QC Physics; TK Electrical engineering. Electronics Nuclear engineering
• Online Access: http://eprints.um.edu.my/19639/; http://dx.doi.org/10.1049/el:20030823

A gain clamped long wavelength band erbium-doped fibre amplifier (L-band EDFA) based on a ring laser cavity is demonstrated using a fibre-Bragg grating (FBG) at the output end of the amplifier. This new design provides a good gain clamping as well as a gain flattening. The gain is clamped at 16.9 dB with gain variation of less than 0.1 dB from input signal power of -40 to -18 dBm by setting the VOA = 5 dB. Also, the amplifier has the flattest gain spectrum at VOA = 5. The gain variation is less than 1.0 dB within the wavelength range from 1570 to 1600 nm. This gain clamped amplifier also can support a 12 channel WDM system.