Study on Fat as the Propagation Medium in Optical-Based In-Body Communications

Materials and Methods• An experimental test-bed comprised an optical transmitter (LED driver and LED) and an optical receiver (sensor and optical power meter).• The biological tissue was used as the optical medium, which is (1) Pure fat tissue (15 mm), (2) pure flesh (15 mm), (3) Sample #1 (30 mm), (4) sample #2 (38 mm), and (5) sample #3 (40 mm).• NIR light 810 nm was chosen to illuminate the biological tissue as it has better propagation properties across tis-sues than other wavelengths.• All samples were warmed in a heat chamber to temperatures of 23°C and 37°C for measurement purposes.• LED driver variation: 100 mA, 200 mA, 300 mA, 400 mA, and 500 mA.