| 摘要 |
<p>The invention relates to opto-electronic modules as they are extensively used in the field of optical communication, e.g. in DIL or Butterfly housings as pump lasers for Erbium-doped fiber amplifiers. Such a module (10) comprises a laser (1) mounted on a base plate (3) and a fiber holder (4) with a fiber (2) to be aligned with the laser (1). The fiber holder (4) is usually mounted to the base plate (3) by laser welds (5). To allow precise alignment before mounting, the base plate (3) has a flanged protrusion (6) positioned between the laser (1) and the fiber holder (4), against which protrusion (6) the fiber holder (4) abuts. In the embodiment shown, pairs of welds (5a and 5d; 5b and 5c) connect the fiber holder (4) to the protrusion (6). To minimize post weld shift, all welds (5a to 5c) are arranged preferably symmetrically around the fiber (2) and essentially in a single plane approximately perpendicular to the optical axis of the module (10). In a preferred embodiment, the fiber holder (4) and the protrusion (6) have on either side of the fiber (2) a similar surface structure with planar facets (4a and 6a; 4b and 6b) which, when being joined by the welds, provide a stepless surface and again minimize post weld shift. This surface structure also allows for laser welding from a direction substantially perpendicular to the base plate (3), e.g. welding within a housing through its opening. Moreover, the invention includes a method of manufacturing such a module (10). <IMAGE></p> |
