A sensor assembly comprising: a remote data concentrator, RDC, disposed to transmit a first set of optical pulses and a third optical pulse along an optical fiber remote from the RDC, wherein: the first set of optical pulses includes a parameter request signal; and the third optical pulse comprises an unmodulated energy transmission; and an optically powered transducer module, OPTM, connected to the optical fiber, and comprising: a photodiode disposed to receive the first set of optical pulses and the third optical pulse; an energy storage device configured to be charged by the photodiode from the first set of optical pulses and the third optical pulse; a first sensor powered by discharging the energy storage device once the energy storage device is adequately charged, and disposed to generate first sensor data by sensing a parameter specified by the parameter request signal; a processor powered by discharging the energy storage device and configured to generate a signal packet from output of the first sensor; and a laser powered by discharging the energy storage device and configured to transmit a second set of optical pulses along the optical fiber to the RDC after the first set of optical pulses is received, the second set of optical pulses including a first part of the first sensor data, and further configured to transmit a second part of the first data to the RDC after the third optical pulse, using capacitor charge accumulated from the third optical pulse, wherein the third optical pulse is received from the RDC after transmitting the second set of optical pulses. the first set of optical pulses includes a parameter request signal; and the third optical pulse comprises an unmodulated energy transmission; and an optically powered transducer module, OPTM, connected to the optical fiber, and comprising: a photodiode disposed to receive the first set of optical pulses and the third optical pulse; an energy storage device configured to be charged by the photodiode from the first set of optical pulses and the third optical pulse; a first sensor powered by discharging the energy storage device once the energy storage device is adequately charged, and disposed to generate first sensor data by sensing a parameter specified by the parameter request signal; a processor powered by discharging the energy storage device and configured to generate a signal packet from output of the first sensor; and a laser powered by discharging the energy storage device and configured to transmit a second set of optical pulses along the optical fiber to the RDC after the first set of optical pulses is received, the second set of optical pulses including a first part of the first sensor data, and further configured to transmit a second part of the first data to the RDC after the third optical pulse, using capacitor charge accumulated from the third optical pulse, wherein the third optical pulse is received from the RDC after transmitting the second set of optical pulses. a photodiode disposed to receive the first set of optical pulses and the third optical pulse; an energy storage device configured to be charged by the photodiode from the first set of optical pulses and the third optical pulse; a first sensor powered by discharging the energy storage device once the energy storage device is adequately charged, and disposed to generate first sensor data by sensing a parameter specified by the parameter request signal; a processor powered by discharging the energy storage device and configured to generate a signal packet from output of the first sensor; and a laser powered by discharging the energy storage device and configured to transmit a second set of optical pulses along the optical fiber to the RDC after the first set of optical pulses is received, the second set of optical pulses including a first part of the first sensor data, and further configured to transmit a second part of the first data to the RDC after the third optical pulse, using capacitor charge accumulated from the third optical pulse, wherein the third optical pulse is received from the RDC after transmitting the second set of optical pulses.