There have been several efforts to develop multi-gigabit transmission systems. With regard to the bit-rate-distance product, the highest system reported to our knowledge achieves 554Gb·km/s for direct detection systems using direct modulation of DFB LD and dispersion shifted fiber and 404Gb·km/s for coherent transmission system. Direct detection systems suffer from fiber chromatic dispersion. However, coherent transmsion systems can compensate for waveform distortion due to fiber chromatic dispersion using electrical circuits.
© 1988 Optical Society of AmericaPDF Article