| 摘要 |
<p>A multi-core optical waveguide 10, such as a dual core waveguide, having a pair of cores 12,14 disposed within a cladding 13 is provided. The cores are equally spaced and parallel to the axis of the waveguide. The cores can be spaced to provide optical coupling between the cores. The outer dimension d2 of the cladding 13 is at least about 0.3 mm; and the outer dimension d1 of the cores 12,14 is such that they propagate in a single spatial mode. The multi-core waveguide may be used in many optical components, such as a bandpass filter and an optical add/drop multiplexer. For the bandpass filter, a Bragg grating having the same reflection wavelength is written into both cores at substancially the same distance from the imput end 86,87 of the cores. The cores 12,14 have the same propagation constants to permit coupling of all the energy of the WDM input signal 84 from one core to the other. The length of the waterguide 100 is substantially equal to the coupling length (Lc), provided all the energy of the through wavelengths is desired at the output end of the second core. Generally, the grating 82 is substantially centered in the waveguide at Lc/2.</p> |
