Fig. 3: Locking range and dynamics of the self-injection-locked laser.
From: Harnessing micro-Fabry–Pérot reference cavities in photonic integrated circuits
a, RF beat-note spectrum of the self-injection-locked laser and a stable laser with a sweeping current on the DFB laser yields a 265-MHz locking range. b, Theoretical locking curve. The self-injection-locked laser entering and exiting the locked state are due to the relaxation oscillation of the DFB laser. The off-resonance curve deviates from free running due to the residual broadband mirror reflection.
