Evaluation of EDB code in optical fiber communication systems
| Autor: | Mikio Takahara, Tomofumi Ohishi |
|---|---|
| Rok vydání: | 1987 |
| Předmět: |
Optical fiber communication systems
Optical fiber Computer Networks and Communications business.industry Computer science Bandwidth (signal processing) Communications system law.invention Wavelength Optics law Electronic engineering Binary code Wide band Electrical and Electronic Engineering business Non-return-to-zero |
| Zdroj: | Electronics and Communications in Japan (Part I: Communications). 70:93-101 |
| ISSN: | 1520-6424 8756-6621 |
| DOI: | 10.1002/ecja.4410700310 |
| Popis: | Optical fiber is generally believed to have a wide band but the step type or some of the graded-type fibers have a narrow band and hence a narrow-band code is necessary for high bit rate transmission or a long repeater interval. In the system with signal-dependent noise, such as the optical fiber communication system, the optimum code levels of a multilevel code are spaced unequally when the average light power is prescribed. In this paper three types of codes — the duobinary code typical of a narrow-band transmission code, the extended duobinary code with three unequally spaced decision levels, and the conventional binary code — are compared with respect to the maximum transmission distance. Also, the difference of maximum transmission distances of duobinary code and binary code is calculated with the fiber bandwidth as a parameter and the range in which the duobinary code and extended duobinary code are advantageous over the binary code is clarified. As an example, when the oscillation wavelength=0.85 μm, the fiber bandwidth=100 MHz · km, length-dependent parameter of fiber=0.7, BER=10−9 and bit rate=200 Mbps, maximum transmission distances of duobinary code are about 1.8 times and about 2 times that of the binary code, respectively. |
| Databáze: | OpenAIRE |
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