| 摘要 |
<p>An optical apparatus (4) for dropping and/or adding signals from an optical signal WDM (1000) comprising a plurality of N signals having a wavelength λ1, λ2... λN, said apparatus (4) comprising a first optical device (1) adapted to drop from said WDM optical signal (1000) at least one signal at a wavelength λx, preselected among said wavelengths λ1, λ2... λN, a second optical device (2) adapted to drop from said WDM optical signal (1000) a possible residual component of said at least one signal at a wavelength λx, to drop at least one signal at a wavelength λy, preselected among said wavelengths λ1, λ2... λN, to receive from said second input (22) at least one add signal having a wavelength λix substantially equal to said wavelength λx and to add it to said WDM optical signal (1000), and a third optical device (3) adapted to drop from said WDM optical signal (1000) a possible residual component of said at least one signal at a wavelength λy; to receive from said second input (32) at least one add signal having a wavelength λix substantially equal to said wavelength λy and add it to said WDM optical signal (1000).</p> |
