週期構造導波路に損失をもつDistributed Bragg-ReHector Laserの発振しきい値

抄録

Distributed Bragg-reflector lasers with optical loss in corrugated waveguide are analyzed in the scheme of coupled-mode theory. Threshold solution for the laser gain is calculated for various values of the coupling coefficient, the pumped length, and the optical loss coefficient.
It is shown that the distributed Bragg-reflector laser considered here has a minimum value of the threshold gain, if the pumped length is chosen appropriately. As the optical loss of the corrugated waveguide is increased, the optimum pumped length ratio increases under the condition that the normalized coupling coefficient kL has a constant value. If the pumped length is adjusted to operate under optimum condition, the optical loss does not affect the threshold gain to any appreciable extent.