Ae. Willner et Sm. Hwang, PASSIVE EQUALIZATION OF NONUNIFORM EDFA GAIN BY OPTICAL FILTERING FORMEGAMETER TRANSMISSION OF 20-WDM CHANNELS THROUGH A CASCADE OF EDFAS, IEEE photonics technology letters, 5(9), 1993, pp. 1023-1026
Through the incorporation of optical filters in a cascade of Erbium-do
ped fiber amplifiers (EDFA's), with each amplifier exhibiting nonunifo
rm gain, we determine the optimal conditions for passively equalizing
many wavelength division multiplexed (WDM) channels while maintaining
a high SNR. For 20 WDM channels spaced 0.5 nm apart, it is found that
3-dB, 2-nm-wide notch filters with center wavelength at 1.560 mum will
provide sufficient SNR equalization for potential megameter transmiss
ion when located after every 20 EDFA's. This performance is achieved w
ith no a priori knowledge of the input or output signals.