40-Gbps direct modulation of 1.3-µm InGaAlAs DFB laser in compact TO-CAN package

We developed a compact TO-CAN module with a 1.3-μm InGaAlAs directly-modulated laser. We achieved a record relaxation oscillation frequency slope value of 4.85 GHz/mA
^½
and a 40-Gbps modulated transmission over a 40-km-long single-mode fiber.