The period-one (P1) nonlinear dynamics of a semiconductor laser subject to both optical injection and optical feedback are investigated for photonic microwave generation. The optical injection first drives the laser into P1 dynamics so that its intensity oscillates at a microwave frequency. A dual-loop optical feedback then stabilizes the fluctuations of the oscillation frequency. Photonic generation at 45.424 GHz is demonstrated with a linewidth below 50 kHz using a laser with a relaxation resonance frequency of only 7 GHz. The dual-loop feedback effectively narrows the linewidth by over an order of magnitude, reduces the phase noise variance by more than 500 times, and suppresses side peaks in the power spectrum.
© 2013 Optical Society of America
Lasers and Laser Optics
Original Manuscript: December 11, 2012
Manuscript Accepted: December 26, 2012
Published: January 28, 2013
Jun-Ping Zhuang and Sze-Chun Chan, "Tunable photonic microwave generation using optically injected semiconductor laser dynamics with optical feedback stabilization," Opt. Lett. 38, 344-346 (2013)