Tunable DBR lasers fabricated by selective area growth technique

The tunable ridge waveguide distributed Bragg reflector (DBR) lasers grown by selective area growth and designed for WDM communication systems at 1.55 μm is reported. The threshold of DBR lasers is 62 mA, their output power is more than 30 kΩ and their tuning range is 6.5 nm, which can provide 6 WDM channels with a 100 GHz spacing. In the tuning range, the single mode suppression ratio (SMSR) is more than 32 dB and the output power variation of different wavelengths is less than 3 dB.