Synchronization of Two DFB Lasers Using Frequency-Shifted Feedback for Microwave Photonics

Abstract

The phase synchronization of two semiconductor DFB lasers submitted to both frequencyshifted cross-injection and self-feedback is investigated, both numerically and experimentally. A dedicated setup based on monolithic DFB lasers permits to effectively lock the frequency difference of the two lasers on an external reference over a broad range of parameters. In agreement with a delayed rate equation model, it is shown that the sensitivity of the locking to the optical feedback phases is mitigated by using strong cross-injection, thus paving the way to applications for microwave photonics.Other synchronization dynamics can also be observed, such as bounded-phase oscillations.

Microwave Characteristics Analysis of Typical Photosensitive Material InP Under Weak Light Irradiation Based on Quasi-Optical Resonator

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Phase Synchronization of Monolithic Dual DFB Lasers for Microwave Photonics: Experiment vs Model

“…We have built a rate-equation model and compared it carefully with the experimental findings. In particular, we have investigated the role of the unavoidable long delay introduced by the feedback loop, and the influence of the optical feedback phases, that cannot be controlled experimentally and are prone to drifts, on the stable locking regime [3].…”