Title :
Passive equalization of nonuniform EDFA gain by optical filtering for megameter transmission of 20 WDM channels through a cascade of EDFA´s
Author :
Willner, A.E. ; Hwang, S.-M.
Author_Institution :
Dept. of Electr. Eng.-Syst., Southern California Edison Co., Los Angeles, CA, USA
Abstract :
Through the incorporation of optical filters in a cascade of erbium-doped fiber amplifiers (EDFA´s), with each amplifier exhibiting nonuniform 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 mu m will provide sufficient SNR equalization for potential megameter transmission when located after every 20 EDFA´s. This performance is achieved with no a priori knowledge of the input or output signals.<>
Keywords :
erbium; fibre lasers; optical communication equipment; optical filters; wavelength division multiplexing; 1.56 mum; EDFA cascade; EDFA gain; Er doped fibre amplifier; SNR equalization; WDM channels; center wavelength; high SNR; input signals; megameter transmission; nonuniform gain; notch filters; optical filtering; optical filters; optimal conditions; output signals; passive equalization; wavelength division multiplexed; Erbium-doped fiber amplifier; Filtering; Optical amplifiers; Optical attenuators; Optical fiber filters; Optical filters; Optical receivers; Passive filters; Stimulated emission; Wavelength division multiplexing;
Journal_Title :
Photonics Technology Letters, IEEE
