Fully fibered microwave-optical sources at 1.5 μm are studied experimentally. It is shown that the beat note between two orthogonally polarized modes of a distributed-feedback fiber laser can be efficiently stabilized using an optical phaselocked loop that uses the pump-power induced-birefringence as actuator. Beat notes at 1 GHz and 10 GHz of Erbium doped fiber laser are successfully stabilized to a reference synthesizer, passing from the 3 kHz free-running linewidth to a stabilized sub-Hz linewidth, with a phase noise as low as -75 dBc/Hz at 100 Hz offset from the carrier. An ErbiumYtterbium co-doped fiber laser is also investigated and successfully stabilized. Such dual-frequency stabilized lasers could provide compact integrated components for RF and microwave photonics applications.
M. Guionie, L. Frein, F. Bondu, A. Carré, G. Loas, E. Pinsard, B. Cadier, M. Alouini, M. Romanelli, M. Vallet, and M. Brunel, "Dual-polarization DFB fiber lasers as optical phase-locked microwave sources in the 1-10 GHz range," Proc. SPIE 10683, Fiber Lasers and Glass Photonics: Materials through Applications, 106832G (Presented at SPIE Photonics Europe: April 27, 2018; Published: 17 May 2018); https://doi.org/10.1117/12.2306049.5788850837001.
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