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(a) Scanning electron microscopy (SEM) image of lateral gratings etched in a QC laser structure using a mask. The ICP etch was optimized using then atmospheres. (b) SEM image of QCDFB ridge with lateral gratings. Sample has been metalized and the electroplated gold partially removed.
Plot of the injection current vs peak output power for an uncoated DFB device from sample MR2223. Device ridge and rib . Results are for pulsed operation ( pulse width at repetition rate) at the heat-sink temperatures of 250 and .
Laser emission frequency for single mode devices with cavity . Line through data points shows linear tuning of emission with temperature for device with ridge (squares) and device with ridge (triangles). Pulsing conditions used were pulse width at a repetition rate.
Laser emission spectra for a DFB device with wide ridge for temperatures of 190 and . Pulsing conditions used were pulse width at a repetition rate.
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