Fiber optic power-feed system for biomedical application

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An attempt was made to develop an optical power-feed system capable of supplying power to sensors and interfacing circuits. Laser light was transmitted to solar cells, where the optical energy was converted into electrical energy. A continuous-wave laser diode (wavelength 813 nm, maximum optical power 800 mW) was used as the light source. A laser diode with graded-index fiber coupling (400 mm core diameter, numerical aperture 0.2) was connected to 8 solar cells assembled in series around the fiber end. The active area of each solar cell was 0.5\0.27 cm. The open-circuit voltage and the short-circuit current were found to be about 4.5 V and about 8.5 mA, respectively, with a laser diode optical power of 650 mW. Upon temperature measurement using this power-feed system, the modulated signal could be transmitted by a light-link diode via a step index fiber. The results indicated that the system can be used as a power supply for conventional sensor elements.