Abstract

It has been demonstrated that optical amplification techniques using Er³⁺-doped fiber amplifiers (EDFA) are very effective in enhancing the performance of multi-gigabit/s intensity modulation/direct-detection (IM/DD) repeater systems. [1][2] The bandwidth of the EDFA is broad enough to amplify an optical signal with a few picosecond pulse width, therefore, it can be applied to high-bit-rate systems of 12 Gb/s. [3] On the other hand, for transmission systems of more than 10 Gb/s, chromatic dispersion in single mode fibers causes serious degradation in the transmission characteristics even when an external modulation scheme is used.[2] Recently, compensation of fiber chromatic dispersion has been demonstrated in a coherent detection system [4] and a direct detection system. [5].

© 1990 Optical Society of America