Abstract
Recently, intense efforts have been made on experimental studies of multiple optical amplifier repeatered systems using Er-doped fiber amplifiers.1 Among several advantageous features of optical amplifiers, the simultaneous amplification of the wavelength multiplexed signal is of great importance. The combination of WDM technology with optical amplifier transmission is expected to provide the significant system cost reduction by the simplification of the system configuration compared to the regenerative system, the relaxation of the fiber dispersion limitation determined by the square of the bit-rate2 and the deployment of the networking together with the wavelength branching system.3
© 1990 Optical Society of America
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