| 摘要 |
When manufacturing semiconductor lasers having an internal grating (5), such as DFB or DBR lasers, the facets (7) generally have an arbitrary position in relation to the grating. This varying position of a critical one of the facets results in the fact that many of the lasers obtain far from optimum performance. In order to obtain far from optimum performance. In order to obtain good optical performance a distance layer (23) is applied directly to the critical facet. The distance layer has a thickness adapted to the phase of light generated in the laser, in particular to the phase at the facet, thereby producing a desired reflection of the light in the distance layer to give the laser good performance.
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