Multiplexing techniques for interference reduction in time-correlated single photon counting

An optical measurement system comprising:

• a first wearable module comprising
• a first source configured to emit a first light pulse sequence comprising a plurality of light pulses, and
• a first plurality of detectors configured to detect photons from the first light pulse sequence;
• a second wearable module comprising
• a second source configured to emit a second light pulse sequence comprising a plurality of light pulses and that is time interleaved with the first light pulse sequence, and
• a second plurality of detectors configured to detect photons from the second light pulse sequence;
• a control circuit configured to prevent the light pulses of the second light pulse sequence from temporally overlapping with the light pulses of the first light pulse sequence by
• directing the first source to begin emitting the first light pulse sequence at a first time, and
• directing the second source to begin emitting the second light pulse sequence at a second time that is temporally offset from the first time.