1.3 μm InGaAlAs asymmetric corrugation‐pitch‐modulated DFB lasers with high mask margin at 28 Gbit/s

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Direct modulation of a 1.3 µm InGaAlAs asymmetric corrugation‐pitch‐modulated (ACPM) distributed feedback (DFB) laser operated at 28 Gbit/s was experimentally demonstrated. The laser exhibits linear light–current characteristics and a high‐frequency response with a small roll‐off at low frequency compared with a conventional λ /4‐shifted DFB laser. Moreover, it attains a high mask margin (20%) under 28 Gbit/s operation at 55°C. These superior properties are due to a superior ACPM grating that suppresses longitudinal spatial hole‐burning.