Abstract
The feedback sensitivity of a tunable laser with a highly wavelength-selective
reflector using a high-Q Vernier-effect based ring resonator structure is examined through
both experimental and simulation work. The study demonstrates that by properly tuning the
amplitude and phase of the reflector, the laser exhibits reduced feedback sensitivity, leading to
improved laser performance under external optical feedback. The onset of deterioration in the
quantum-well-based laser due to optical feedback, characterized by excess relative intensity noise
(RIN), is suppressed through red detuning to a feedback level above -13 dB, over 5 dB higher than
for the non-detuned laser state. The study further characterizes the high-speed data transmission
performance of the laser, showing that the red-detuned ring resonator based tunable laser offers
enhanced stability against feedback. Simulation results confirm that the phase-detuned tunable
laser, with its lower feedback coefficient, outperforms traditional distributed Bragg reflector
(DBR) lasers, particularly under detuning conditions. Related Research Topics
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