Photonic sensors, namely, fiber-optic sensors for measuring temperature, distances, positions, velocity, acceleration, strain, vibration, humidity, pressure, and structural health monitoring, and for detecting the presence of chemical agents; Sensor systems comprised of fiber-optic sensors and optoelectronic interrogators for fiber-optic sensors, all of the aforementioned being for for measuring temperature, distances, positions, velocity, acceleration, strain, vibration, humidity, pressure, ...