A photonic device, comprising: a laser that is tunable and produces a laser beam at a laser frequency and at a first polarization; an optical resonator exhibiting an electro-optic effect and structured to support a first whispering gallery mode in a first polarization and a second whispering gallery mode in a second polarization circulating in the optical resonator, wherein the first polarization and second polarization are mutually orthogonal; an evanescent optical coupler configured for evanescently coupling a portion of the laser beam into the optical resonator and evanescently coupling out of the resonator a resonator output light comprising a first light having the first polarization and a second light having the second polarization; electrodes (111, 112) formed on the optical resonator and configured to apply a modulation control signal to effectuate an optical modulation of light based on the electro-optic effect; a polarization control device configured to rotate a polarization of a portion of the laser beam that does not enter the optical resonator to produce a modified laser light at the second polarization; an optical polarizer interposed between the optical evanescent optical coupler and an optical combiner, wherein the optical polarizer is configured to block the first resonator output light and allow the second resonator output light to pass through the optical polarizer, and wherein the optical combiner is configured to receive the modified laser light and the second resonator output light that passes through the optical polarizer; an optical detector configured to receive an output light of the optical combiner so as to allow the modified laser light and the second resonator output light to interfere at the optical detector to produce a single modulation sideband; a laser locking mechanism coupled between the optical detector and the laser and configured to lock the laser frequency to one of the first and second whispering gallery mode resonances of the optical resonator; and a feedback circuit coupled between the optical detector and the electrodes to receive a detector output from the optical detector and to produce the modulation control signal at a tunable modulation frequency. a laser that is tunable and produces a laser beam at a laser frequency and at a first polarization; an optical resonator exhibiting an electro-optic effect and structured to support a first whispering gallery mode in a first polarization and a second whispering gallery mode in a second polarization circulating in the optical resonator, wherein the first polarization and second polarization are mutually orthogonal; an evanescent optical coupler configured for evanescently coupling a portion of the laser beam into the optical resonator and evanescently coupling out of the resonator a resonator output light comprising a first light having the first polarization and a second light having the second polarization; electrodes (111, 112) formed on the optical resonator and configured to apply a modulation control signal to effectuate an optical modulation of light based on the electro-optic effect; a polarization control device configured to rotate a polarization of a portion of the laser beam that does not enter the optical resonator to produce a modified laser light at the second polarization; an optical polarizer interposed between the optical evanescent optical coupler and an optical combiner, wherein the optical polarizer is configured to block the first resonator output light and allow the second resonator output light to pass through the optical polarizer, and wherein the optical combiner is configured to receive the modified laser light and the second resonator output light that passes through the optical polarizer; an optical detector configured to receive an output light of the optical combiner so as to allow the modified laser light and the second resonator output light to interfere at the optical detector to produce a single modulation sideband; a laser locking mechanism coupled between the optical detector and the laser and configured to lock the laser frequency to one of the first and second whispering gallery mode resonances of the optical resonator; and a feedback circuit coupled between the optical detector and the electrodes to receive a detector output from the optical detector and to produce the modulation control signal at a tunable modulation frequency.