发明名称 |
Data-transmission system and method using fiber-optical transmission |
摘要 |
For the transmission of data by way of a fiber-optical path, three-bit code words representing eight different signal levels are generated in respective signal periods 2T and are converted into pairs of ternary luminous waveforms of duration T having two possible amplitude levels L (low) and H (high). Each waveform pair includes at least one but not more than two light pulses H, of a width not exceeding T/2, occurring in either of two time positions within a cycle T. At the receiving end, the incoming light pulses are modulated-either before or after conversion into electrical signals-with a ramp signal of recurrence period T which transposes the pulses H to either of two elevated amplitude levels depending upon their time position within a cycle, with the pulses L remaining at a low level. The resulting electrical pulses are integrated over successive periods equal to T and sampled in each of these periods for comparison with predetermined thresholds.
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申请公布号 |
US4201909(A) |
申请公布日期 |
1980.05.06 |
申请号 |
US19780948870 |
申请日期 |
1978.10.05 |
申请人 |
CENTRO STUDI E LAB TELECOMUNICAZIONI |
发明人 |
DOGLIOTTI, RENATO;PIRANI, GIANCARLO |
分类号 |
H04B10/00;G02B6/00;G02F1/01;H03M7/14;H04B10/04;H04B10/06;H04B10/142;H04B10/152;H04L25/48;H04L25/49;(IPC1-7):H04B9/00 |
主分类号 |
H04B10/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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