| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a duobinary optical transmitter that is tolerant of chromatic dispersion of optical fiber. <P>SOLUTION: The duobinary optical transmitter comprises a precoder for generating a first signal with 2-level from input binary data and generating a second signal having a waveform, obtained by inverting the first signal; a Mach-Zehnder modulator for generating a differential phase shift keying (DPSK) modulated optical signal, by modulating light inputted by the first signal and the second signal; and a delay interferometer for splitting the DPSK modulated optical signal into a first split signal and a second split signal, delaying the second split signal, and generating a duobinary optical signal by interfering the first split signal with the second delayed split signal, wherein a time required for delaying the second split signal is set to 0.50 to 0.8 bit. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
