| 摘要 |
<p>The present invention relates to a coupling element for coupling between optical elements, for instance a ferrule encased fiber end and a lens, two lenses, or filter and lens assemblies, which provides a reliable joint with a determined spacing and angular orientation between them if needed. Advantageously, the coupling in accordance with the present invention does not obscure optical transmission through the coupling with an epoxy layer. A stand off element (20) is provided which has opposite reference surfaces (21) for joining the end faces (15,17) of the optical elements (14,16) and a central aperture (22), slot or equivalent open area for light transmission In use the open area (22) is aligned, for example with the fiber end (15) and the desired port (17) in the lens (16). Adhesive connection can be provided between the opposite surfaces (21) of the stand off element (20) and the coupling end faces (15,17) of the optical elements. No epoxy is applied over the open area (22). Other securing methods such as external securing elements can be used. Alignment is established by the planar surfaces (21) of the stand off element (20). The separation between elements can be accurately established by selecting the desired thickness between faces (21) of the stand off element (20). Alternatively, the surfaces of the stand off element may be angled to compliment the surfaces of the elements, or to provide an accurate angled coupling. Loss is reduced by not transmitting light through an epoxy layer. <IMAGE> <IMAGE></p> |
