Titlebook: Coherent Lightwave Communications Technology; Sadakuni Shimada (Board Director) Book 1995 Springer Science+Business Media Dordrecht 1995 c

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Epilogue,For the epilogue of this book, we would like to discuss the impact of coherent lightwave technologies on telecommunication networks for the future as proposed by Brackett (1990), Nosu and Toba (1992) and Caruso (1990).

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itful potential oflightwaves, namely the capacity of extremely high frequency electromagnetic information carrier waves. The frequency oflightwaves used for fiber-optic transmission is about 200 THz 14 (2 x 10 Hz), and the frequency bandwidth of the fiber low loss region is about 13 20 THz (2 x 10 Hz). Recent978-0-412-57940-0978-94-011-1308-3

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https://doi.org/10.1007/978-3-030-78431-7udinal mode oscillation can be reduced by distributed feedback (DFB) or distributed Bragg reflector (DBR) laser diode structures. These laser diodes oscillate in only one longitudinal mode but the longitudinal mode has the spectral linewidth resulting from phase noise.

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ommunication started when the first wireless system was invented by Marconi in 1895. However, we had to wait about one hundred years to realize a similar technology in the lightwave frequency region. The invention of lasers in 1960 and two technology innovations in 1970 -low loss silica fiber and se

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https://doi.org/10.1007/978-3-030-78431-7uency region as is possible in radio communication systems. In order to multi/demultiplex narrowly spaced optical signals, we need filters with high resolution. Some filter configurations developed for microwave and millimeter-wave systems can be applied to optical FDM systems as in Ohtomo, Shimada and Suzuki (1971).