Title :
Demonstration of high-dispersion tolerance of 20-Gbit/s optical duobinary signal generated by a low-pass filtering method
Author :
Ono, Takashi ; Yano, Yutaka ; Fukuchi, Kiyoshi
Author_Institution :
Opto-Electron. Res. Labs., NEC Corp., Kawasaki, Japan
Abstract :
Waveform distortion due to fiber chromatic dispersion in a high-speed optical transmission system is a serious problem. An effective way to avoid this distortion is the use of an optical duobinary signal, which has only half the spectrum bandwidth of a conventional intensity modulation (IM) signal. For generating optical duobinary signals, two types of modulation schemes are well known; a low-pass filtering (LPF) method and an electrical one-bit delay method. From computer simulation results for both modulation schemes, we have found that the LPF method shows larger suppression for the optical spectrum side-lobes and has more tolerance against the fiber dispersion than the one-bit delay method. Therefore, we employed the LPF method to evaluate dispersion tolerance of the optical duobinary signal. By using a newly developed, high-speed optical duobinary transmitter and receiver, more than 40-km standard fiber [1.3-μm zero-dispersion single-mode fiber] transmissions have been demonstrated at 20 Gbit/s. The result indicates the robustness of optical duobinary signals against dispersion in high-capacity, long-distance transmission
Keywords :
low-pass filters; optical fibre dispersion; optical fibre networks; optical transmitters; time division multiplexing; waveform analysis; 1.3 micron; 20 Gbit/s; fiber chromatic dispersion; high-capacity long-distance transmission; high-dispersion tolerance; high-speed TDM; high-speed optical transmission system; low-pass filtering method; optical duobinary signal; optical duobinary transmitter/receiver; robustness; standard fiber; waveform distortion; zero-dispersion single-mode fiber; Bandwidth; Chromatic dispersion; Delay; High speed optical techniques; Intensity modulation; Optical distortion; Optical filters; Optical modulation; Optical receivers; Optical transmitters;
Conference_Titel :
Optical Fiber Communication. OFC 97., Conference on
Conference_Location :
Dallas, TX
Print_ISBN :
1-55752-480-7
DOI :
10.1109/OFC.1997.719879