| 摘要 |
<p>A (de)multiplexer (10) for use in optical communications systems for multiplexing and demultiplexing an optical signal includes a multiplex optical waveguide (14) propagating a plurality of optical channels and a plurality of single channel optical waveguides (16) each propagating a single channel. A diffraction grating (200) is optically coupled between the multiplex optical waveguide and the single channel optical waveguides for diffracting an optical signal between the receiving/transmitting end of the multiplex optical waveguide and the receiving/transmitting end of the single channel optical waveguide. The diffraction grating (200) has at least two surfaces (202, 204) optically coupled to the waveguides, each surface having a plurality of grooves (216) therein. Each of the surfaces is angularly displaced relative to one another a select amount such that a portion of the optical signal diffracted by each surface is offset the direction of dispersion relative to the portions of the optical signal diffracted by the other surfaces to broaden the transmission band at the receiving/transmitting ends of the single channel and multiplex optical waveguides.</p> |
