| 摘要 |
<p>A system and method are disclosed for demulitplexing closely spaced channels carrying optically encoded data. A composite optical signal having data channels corresponding to centre wavelengths lambda 1, lambda 2, lambda 3, lambda 4, ... lambda n are separated into two composite optical signals of first of which comprises data channels corresponding to centre wavelengths lambda 1, lambda 3, ... lambda n and a second which comprises data channels corresponding to centre wavelenghts lambda 2, lambda 4, ... lambda n-1, wherein adjacent channels centre wavelengths are separated from one another by a distance "d". A periodic multi-cavity Fabry-Perôt etalon having a free spectral range of "2d" is coupled to a circulator for launching an input beam. The first of the two composite optical signals carrying channels 1, 3, ... n is reflected from the input port of the etalon and the second of the of the two optical signals carrying channels 2, 4, .. n-1 is transmitted through the etalon. After the two signals are separated, further separation can be achieved by using conventional dichroic filters.</p> |
