| 摘要 |
<p>Optical unit (9) for processing a pulse pattern, and an optical transmission system comprising such a unit (9). The unit (9) has an input for receiving a signal pulse series having a modulation period T and means for processing this signal pulse series. The means are constituted by a radiation-controlled optical switch (11) comprising a directional coupler (13) having four ports (15, 17, 19, 21). The first port (15), which forms part of an input of the switch (11), is used for receiving the signal pulse series. The second port (17) forms part of an output of the switch (11), and the third (19) and the fourth port (21) are interconnected by means of a waveguiding structure (23). This structure (23) is provided with a non-linear optical element which is situated in the waveguiding structure at such a position that the intensity of a pulse of the signal pulse series realizes a non-linear behaviour of the intensity transmission characteristic of the switch during a defined time interval t. <IMAGE></p> |
