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(a) Schematic of SGDFB device structure. (b) Theoretical reflectivity spectra of front and back sections for different current injection schemes. Spectra are overlapped in order to show shift of coincidence wavelength.
(a) Continuous wave emission spectra for Laser 1 at room temperature with uniform current density in both sections. Two clusters belonging to two different grating supermodes are shown. (b) Continuous tuning between supermodes 1 and 2 using dual section current control.
Single-mode emission spectra for Laser 1 across a wide wavelength range at room temperature. Upper figures show both the side mode suppression ratio and continuous wave output power as a function of emission wavelength.
Room temperature, continuous wave, single-mode emission spectra for three lasers with different grating periods from the same wafer. A gap-free electrical tuning range of 270 nm (120 cm−1) is demonstrated.
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