High Spectral Density Optical Communication TechnologiesMasataka Nakazawa, Kazuro Kikuchi, Tetsuya Miyazaki The growth of Internet traf?c in recent years surpassed the prediction of one decade ago. Data stream in individual countries already reached terabit/s level. To cope with the petabit class demands of traf?c in coming years the communication engineers are required to go beyond the incremental improvement of today’s technology. A most promising breakthrough would be the introduction of modulation f- mats enabling higher spectral ef?ciency than that of binary on–off keying scheme, virtually the global standard of ?ber-optic communication systems. In wireless communication systems, techniques of high spectral density modulation have been well developed, but the required techniques in optical frequency domain are much more complicated because of the heavier ?uctuation levels. Therefore the past trials of coherent optical modulation/detection schemes were not successful. However, the addition of high-speed digital signal processing technology is the fundam- tal difference between now and two decades ago, when trials of optical coherent communication systems were investigated very seriously. This approach of digital coherent technology has attracted keen interest among communication specialists, as indicated by the rapid increase in the pioneering presentations at the post-deadline sessions of major international conferences. For example, 32 terabit/s transmission in a ?ber experiment based on this technology was reported in post-deadline session of Optical Fiber Communication Conference (OFC) 2009. The advancement of the digital coherent technologies will inevitably affect the network architecture in terms of the network resource management for the new generation photonic networks, rather than will simply provide with huge transmission capacity. |
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High Spectral Density Optical Communication Technologies Masataka Nakazawa,Kazuro Kikuchi,Tetsuya Miyazaki No preview available - 2010 |
High Spectral Density Optical Communication Technologies Masataka Nakazawa,Kazuro Kikuchi,Tetsuya Miyazaki No preview available - 2012 |
High Spectral Density Optical Communication Technologies Masataka Nakazawa,Kazuro Kikuchi,Tetsuya Miyazaki No preview available - 2010 |
Common terms and phrases
achieve amplifiers amplitude applied band bandwidth binary BPSK capacity carrier channel circuit coherent optical coherent receiver combined compensation complex components configuration constellation correction decoder delay demodulation demonstrated detection devices differential dispersion DQPSK effect electrical Electron employed equalization error estimation example experiment experimental Fiber Commun Figure filter frequency function Gb/s given high-speed homodyne IEEE implementation increase input integrated keying laser Lett light Lightwave limit loss measured mode modulation formats multiplexing obtained OFDM operation optical communication optical fiber orthogonal OSNR output performance phase noise Photon pilot polarization Proc QPSK receiver reduced reported respectively scheme sensitivity shown in Fig shows signal signal processing spectral efficiency spectral linewidth structure subcarrier symbol technique Technol tolerance transmission transmitter tunable wavelength