| 摘要 |
<p>Method for suppressing side modes during the use of a tunable laser (10) of MGY type, which laser (10) comprises an amplification section (11), a phase section (12) and a reflector section, which reflector section comprises a Y-branched waveguide, with a first branch (14a) and a second branch (14b), where the point of operation of the laser (10) is defined by way of feeding a respective current through the phase section (12), the first branch (14a) and the second branch (14b), where possible combinations of these currents span a three- dimensional space, in which elongated volumes define combinations of currents for which the laser (10) is operated in the same mode and where two-dimensional sections, defined by holding the current through the phase section (12) constant and varying the currents through the branches (14a;14b), through a certain of said volumes constitute modeflats. The invention is characterised in that the two branch currents (14a; 14b) are controlled within a certain modeflat so that the point of operation of the laser (10) does not coincide with the centre of the modeflat, but is sufficiently far from the periphery of the modeflat for mode transitions not to occur, within a predetermined time period, as a consequence of changes related to ageing of the laser (10), leading to drift of the point of operation of the laser (10).</p> |
