摘要 |
<p>An apparatus (10) for processing optical signals includes a cladding material (12) having therein at least two elongate core regions (13, 14) which serve as respective waveguides. A coupling portion (26) therein includes adjacent and parallel portions (27, 28) of the two waveguides which extend sufficiently closely for a sufficient distance to permit coupling of radiation between these waveguide portions. Structure is provided that respectively permits and frustrates such coupling for respective component signals having respective different wavelengths. The coupling portion may optionally include an externally controlled switching section that can have a selected one of the two states in which is respectively transmissive and nontransmissive to radiation.</p> |