An optical sensor array includes a plurality of interferometric sensors that are disposed at a plurality of locations in a region of interest. To determine a physical parameter at the plurality of locations, the array is interrogated with a plurality of optical pulses covering a range of optical wavelengths. The signals returned in response to the interrogating pulses are analyzed to determine an optical path imbalance associated with each sensor, where the optical path imbalance bears a relationship to the physical parameter of interest. Each sensor's contribution to the returned signals is determined by measuring the transit time between the launching of the interrogating pulses and the detection of the returned signals. By determining each sensor's contribution, the physical parameter may be determined at each of the plurality of locations.