Low-frequency electrical noise of high-speed, high-performance 1.3 μm strained multiquantum well gain-coupled distributed feedback lasers

Measurements of low-frequency electrical noise (LFN) in an in-phase gain-coupled distributed feedback lasers with etched quantum-well active-layers emitting at 1.3 μm wavelength have been conducted. In particular, the injected current dependence of LFN is investigated over a wide range of injection current (from 10−2 μA to 60 mA). Pure 1/f noise spectra were observed in all measurements. The current dependence of the 1/f noise strongly correlates to the I–V characteristics. We find that noise from different mechanisms dominates when the lasers operate in different ranges of injection currents.