| 摘要 |
<p>A communication system comprising a communication unit with a first part (1) and a number of a second part (2), where the second part (2) is arranged to be placed at the location of an end user such as a domicile, office or equivalent, and where the first part (1) is common for a number of said second parts (2), where the first part and the second part respectively comprise a laser (6), and where each second part is connected with the first part by means of a fibre optic cable (3) and a frequency filter (4; 12, 13), and where the first part (1) and the relevant second part (2) are arranged to exchange information by means of laser light. The invention is characterised in that each one of the second parts (2) comprises a tunable laser (6), in that the first part (1) is arranged to analyse light received from a second part (2), and in that the first part (1) is arranged to transmit information to the second part (2) while the first part is receiving light from the second part, and in that the said information contains information for the second part (2) that it should adjust, where required, its frequency or wavelength, and in that the second part (2) thus is arranged to change its frequency or wavelength.</p> |
