Temperature dependence of dynamic properties and tolerance to optical feedback of high speed 1.3 m DFB Quantum-Dot Lasers

The temperature dependence of the dynamic performances of p-doped InAs/GaAs quantum dot DFB lasers emitting at 1.3 µm is investigated. A maximum relaxation frequency of ~ 7.5 GHz is demonstrated for a constant bias current over the whole 25°C-85°C temperature range. The Henry factor is temperature independent and remains constant at ~ 2.5. The effect of external optical feedback is assessed on the same device under direct modulation at 10 Gbps up to 85°C. The device is compliant for isolator-free operation at 25°C after transmission over 20 km of standard single mode fiber.