Tuning Range and Threshold Current of the Tunable Twin-Guide (TTG) Laser

The tuning range and threshold current of the recently developed tunable twin-guide (TTG) laser are calculated as a function of the relevant device parameters. It is shown that a maximum continuous tuning range up to 6–7 nm and low threshold currents around 25 mA can be expected with adequately designed 2 µm wide and 400 µm long TTG lasers. A comparison of the calculations to published experimental results shows a fair agreement.