A transmitter transmits both an electric power signal and an information signal. The signal is adjusted for chromatic dispersion in the frequency-domain. More than one such common region may be included in each cell. The generated error detection information is encoded in a predetermined time interval, together with control information of the predetermined time interval, and the encoded information is transmitted over a control channel. The sensor is located such that an amount of overlap between a detection range of the first detection unit and a detection range of the second detection unit at a first object distance is equal to an amount of overlap between those at a second object distance that is close to an infinite distance side compared to the first object distance. A manufacturing and quality control process for making a pharmaceutical-grade ferric citrate that consistently complies with the established Manufacture Release Specification is also disclosed.