| 摘要 |
In the transmission of optical signals over large distances by means of optical fibres, repeaters are used which convert the incoming optical signal into an electrical signal, amplify the electrical signal electronically and reconvert the amplified electrical signal once again into an optical signal. Such repeaters require a large outlay on circuitry. A direct optical amplifier consisting of a two- mode region 10, two inputs 11 and 12, and outputs 13 and 14 considerably reduces the outlay on circuitry. The essence of this arrangement is that the two-mode region 10 is filled with a material which exhibits non-linear optical behaviour. If there is continuous supply of the signal to be amplified via one of the inputs, and of light of high energy via the other, the amplified signal is available at the output of the amplifier. <IMAGE> |
