Optical measurement of physiological blood parameters

A system to optically analyze tissue of a patient comprising:

• a tissue interface assembly configured to emit an input optical signal at a first wavelength and modulated at a first frequency into the tissue, receive a reference optical signal and a measurement optical signal from the tissue, and transfer the reference optical signal and the measurement optical signal to a fiber optic cable;
• the fiber optic cable comprising a second optical fiber configured to transfer the reference optical signal and the measurement optical signal from the tissue interface assembly to the transceiver;
• the transceiver configured to receive and convert the reference optical signal into a digital reference signal and to receive and convert the measurement optical signal into a digital measurement signal;
• and
• a digital processor configured to process the digital measurement signal and the digital reference signal to determine a phase delay between the digital measurement signal and the digital reference signal and process the phase delay to determine physiological parameter for the tissue.

A method of operating a system to analyze tissue of a patient, the method comprising:

• generating an input optical signal and transferring the input optical signal over a fiber optic cable;
• receiving the input optical signal from the fiber optic cable and emitting the input optical signal into the tissue;
• receiving a reference optical signal and a measurement optical signal from the tissue and transferring the reference optical signal and the measurement optical signal over the fiber optic cable;
• receiving the reference optical signal and the measurement optical signal from the fiber optic cable and converting the reference optical signal into a digital reference signal and converting the measurement optical signal into a digital measurement signal;
• and
• processing the digital measurement signal and the digital reference signal to determine a phase delay between the digital measurement signal and the digital reference signal and processing the phase delay to determine physiological parameter for the tissue.