“…Based on the calculation, the order of the lasing mode are 5, 3, 4, 2, and 4, for the ribbon with the thickness of 400, 230, 304, 110, and 316, respectively. Further improvements can be obtained with combinatorial etching technique, or position-related ribbon thickness control techniques, by which different resonance wavelength F-P DBR cavities can even be integrated on a single NR [42,58,59].…”