摘要 |
PROBLEM TO BE SOLVED: To provide an optical pulse transmission scheme capable of simultaneously achieving high speed and expanded frequency use efficiently without producing intersymbol interference.SOLUTION: In ultra high-speed OTDM transmission obtaining high speed to an N-fold symbol rate of an optical signal pulse sequence having a symbol rate R by optical time division multiplex (OTDM), high speed transmission with intersymbol interference suppressed to the minimum even in the case of a broad pulse width is achieved by using an optical Nyquist pulse having zero intensity in positive and negative directions from the center at time intervals of 1/NR on a time axis. |