Abstract
We report a slotted high-order surface grating semiconductor laser without a multi-section design. A wide tuning range of 20 nm with side mode suppression ratios (SMSRs) larger than 30 dB is realized by controlling the temperature and the injection current. With a temperature variation of 30 °C, the wavelength tuning range is larger than 10 nm, in contrast to ∼3 nm for thermo-optic tuning range in other grating-based lasers. By analyzing the gain and the reflection spectrum of the device, we attribute this wide tuning range to the movement of the temperature-induced gain spectrum between the two adjacent Bragg reflection peaks of high-order surface gratings. This is a new method to realize the wide wavelength tuning range.
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