Abstract
Tunable twin-guide distributed feedback (TTG-DFB) lasers are fabricated by the all-metalorganic vapor phase epitaxy (MOVPE) process. A very wide continuous tuning range (4.9 nm/25 mA) with single-mode operation is obtained by improving the efficiency of current-injection into the modulation layer. The side-mode suppression ratio (SMSR) is larger than 20 dB in the tuning range up to 4.3 nm.The threshold current is 16 mA and maximum output power is 5 mW.
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