TRANSMISSION OUTPUT LEVEL CONTROL CIRCUIT

摘要

PURPOSE:To prevent production of an excess output level by using a transmission output level control circuit of a slave equipment so as to correct nonlinearity without use of an analog circuit. CONSTITUTION:An A/D converter 41 converts a reception signal level of a transmission output level control circuit of a slave equipment into a digital signal and the digital signal is used for an address input of a memory 42. A data of a transmission output level inversely proportional to the reception signal level stored in the memory 42 is inputted to a D/A converter 43, in which the data is DA-converted and the transmission level of the optical transmission circuit is decided by the analog output.