发明名称 |
A TELECOMMUNICATIONS SYSTEM EMPLOYING OPTICAL SIGNALS FOR TRANSMISSION |
摘要 |
A telecommunications systems employs signals transmitted along optical fibres. A broad transmission band is provided and enables both video and a number of speech channels to be provided. The system uses PFM signals which have no baseband component, the baseband component being regenerated in the receiver. The receiver includes a wide-band PIN FET (20), and a demodulator using a pulse counting technique. The received pulses are converted to fixed width by an ECL monostable (25) and the baseband signal obtained by a low-pass filter (26). <IMAGE> |
申请公布号 |
GB2153615(B) |
申请公布日期 |
1986.04.23 |
申请号 |
GB19840024811 |
申请日期 |
1984.10.02 |
申请人 |
* BRITISH TELECOMMUNICATIONS |
发明人 |
DAVID JOHN TAYLOR * HEATLEY |
分类号 |
H04B10/152;H04B14/02;(IPC1-7):H04B9/00 |
主分类号 |
H04B10/152 |
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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