Fig. 1. Comparison of all-optical carrier recovery using (a) free-running and (b) injection locked Brillouin laser in optical microcavity.

Fig. 2. Demonstration of injection locking of a Brillouin laser in a WGM microcavity. (a) Experimental setup of our study. The inset shows the optical microscopic photo of the silica micro-rod cavity used in our experiment. (b) Ring down measurement of a microcavity mode exhibiting a Q-factor of 2.6 billion. (c) Optical spectra of the Brillouin laser and the AM sideband used as the seed laser. (d) Comparison of the beat note between the generated Brillouin laser and the pump laser with or without injection locking. The inset shows the close-up beat note spectrum at −10 dB injection ratio. (e) Injection locking range of Brillouin laser under different injection ratios.

Fig. 3. Demonstration of all-optical recovery and SHD data receiving using injection locked Brillouin laser. (a) Experimental setup. (b) SNR, constellation map, and BER measurement of the received 16-QAM OFDM data signal. (c) Phase drifts between the data signal and LO using injection locked and free-running Brillouin lasers.