| 摘要 |
An optical wavelength demultiplexer comprises a monomodal incoming waveguide (1) for an incoming optical signal (S( lambda 1, lambda 2, lambda 3, lambda 4)) being propagated in fundamental guided modes having different polarisations (TE and TM), a conversion device (22) for converting the fundamental modes of one of the polarisations in first-order modes of the other polarisation, a divergence area (23) in which after conversion the incoming signal enters and diverges, a phased array (3) of curved monomodal waveguides provided with an entrance plane (7) and an exit plane (S), for receiving and further guiding the diverging optical signals, a convergence area (32) in which optical signals exiting at the exit plane (8) converge into signal beams (S( lambda i)) converging into separate wavelength-dependent focuses (Fi), and exiting bimodal waveguides (33(i)) joining to said focuses (Fi), thereby providing polarisation independent operation.
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