Gain Flattened and C/L Band Amplified Spontaneous Emission Noise Re-Injected L-band EDFA

Explosive increase in internet services put peer pressure on conventional band grid (1530-1570 nm) and therefore L-band wide wavelength grid is required to cater the ever-increasing demands. In this work, accentuation is given to enhance the Gain flattening of ultra dense (25 GHz) L-band WDM system using single stage EDFA amplifier when ultra low power is launched from 16 and 32 channels. High Gain and Gain flattening is achieved by incorporating three Fiber Bragg Gratings (FBGs) for amplified spontaneous noise reinjection. Maximum ASE is emerged at 1565 nm for the 1575.69 nm to 1579 nm input wavelengths (16 channels) and 1572.58 to 1579 nm (32 channels) at -55 dBm ultra low carrier powers. To optimize different parameters of L-band EDFA, different physical parameters such as core radius, EDF link lengths, launched powers are varied and results are analyzed in terms of Gain, and Gain flatness. Maximum gain is found out to be 34.12 dB at optimal physical parameters of the EDF with Gain Flatness of ±0.45 dB in case of 16 channels and ±1.41 in case of 32 channels.