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. 2016 Mar 24;6:23595. doi: 10.1038/srep23595

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(a) Schematic of an epi-down mounted three-section SGDFB-DBR device. (b) Characterizations of the tunable mid-IR spectra of a SGDFB-DBR device by changing the DC currents on SG1 (solid lines) and SG2 (dashed lines). (c) The corresponding CW power in the tuning range by changing the DC currents on SG1 with a fixed current of 1390 mA on SG2 (left part of (c)), and changing the DC currents on SG2 with a fixed current of 830 mA on SG1 (right part of (c)), respectively.