Development of the optical waveguide solar lighting system for space-based plant growing

This article summarizes the study on the Optical Waveguide (OW) Solar Lighting System for space-based plant growing. In the OW solar lighting system, solar radiation is collected by the concentrator, which transfers the concentrated solar radiation to the OW transmission line consisting of low-loss optical fibers. The OW line transmits the solar radiation to the plant growing units where the solar radiation from the optical fibers is defocused and directed to the plants for optimum intensity for plant growing. In this study, the laboratory OW solar lighting system was constructed and tested for plant growth. The OW system consists of: 1) tracking reflective concentrators; 2) the optical waveguide transmission line; and 3) the plant lighting device. Results of the performance tests and the plant growth tests of the OW solar lighting system showed that the OW system is a viable plant lighting system for growing plant in space.