| 摘要 |
This bidirectional transmission system, especially by optical fibre, between a terminal called the source terminal and a terminal called the user terminal, using a single carrier for both transmission directions and arising from a source localised in the source terminal, includes, for each transmission direction, means for modulating one of the parameters of the said carrier, this parameter being different for these two directions, with an exception in the case of the intensity for which it may be the same, and in all cases with the condition that if the modulation applied first, namely for transmission from the source terminal to the user terminal, is an intensity modulation, it is so with a modulation factor small enough to permanently leave power on which that applied second, namely for transmission from the user terminal to the source terminal, may be exerted. <IMAGE> |
