One important requirement for long-haul WDM signal transmission over cascaded Er-doped fiber amplifiers (EDFAs) is signal power equalization [1]. Broadening the EDFA gain-spectrum is effective to equalize signal power [1, 2, 3]. Another technique is to make the gain-peak wavelength (GPW) of EDFA coincide with the distribution-center wavelength (DCW) of the WDM signals.

© 1995 Optical Society of America

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