发明公开
- 专利标题： Optical FDM system
- 专利标题（中）： Optisches频率复用系统。
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申请号： EP84107533.6申请日： 1984-06-29
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公开(公告)号： EP0131818A2公开(公告)日： 1985-01-23
- 发明人: Scarr, Robert Walter Alister , Bingham, John
- 申请人： International Standard Electric Corporation
- 申请人地址： 320 Park Avenue New York New York 10022 US
- 专利权人： International Standard Electric Corporation
- 当前专利权人： International Standard Electric Corporation
- 当前专利权人地址： 320 Park Avenue New York New York 10022 US
- 代理机构： Graf, Georg Hugo, Dipl.-Ing.
- 优先权： GB8317962 19830701
- 主分类号： H04J15/00
- IPC分类号： H04J15/00 ; H04B9/00 ; H04Q11/02
摘要：
In an optical fibre FDM system, the carriers are derived from the output of a high quality Master Oscillator, which output at frequency fo is applied to a Raman Nath modulator (RNM1) whose other input is a frequency f this gives as its outputs (assuming a five channel system) fo-2f, fo-f, fo, fo + f and fo + 2f. These are modulated by modulators (CM1 to CM5) with the signals to be sent, and the modulation results combined in a combiner (CB) for transmission to a remote station.
The oscillator output is also sent to the remote stations where it is frequency-shifted by a Bragg modulator (BM) and the resultant similarly dealt with by a Raman Nath device (RNM2) to give five frequencies which are used to demodulate the channels.
In an alternative the channel frequencies are switchable.
The oscillator output is also sent to the remote stations where it is frequency-shifted by a Bragg modulator (BM) and the resultant similarly dealt with by a Raman Nath device (RNM2) to give five frequencies which are used to demodulate the channels.
In an alternative the channel frequencies are switchable.
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