| 摘要 |
A laser device (50), in particular a semiconductor laser, emitting optical radiation with a defined mode pattern can be produced from a standard Fabry-Perot (FP) laser by post-processing at the wafer level, i.e. before the waferis separated into individual dies by cleaving /dicing. A sub-cavity is formed within the FP laser cavity (50). The sub-cavity has a predetermined length and is located between the FP facets (12,14). An aperiodic grating composed of a small number of contrast elements (52), typically less than 10, with predetermined inter-element separations and predetermined spacings relative to the sub-cavity is formed on or in the optical waveguide (16). The inter-element separations and the spacings relative to the sub-cavity produce a filtering function of thye aperiodic grating for optical radiation propagating in the waveguide (16). The laser device (50) is suitable for telecommunicatons applications due to its highside -mode-suppression ratio and narrow-linewitdh.
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