PURPOSE: To obtain an optical communication system by depending upon a phenomenon of mixed phase modulation which varies and controls one or both at the same time of temporal, spatial or both characteristics of spectra of ultra- short light pulses for processing information at a fast repetition rate. CONSTITUTION: A 1st beam 15 includes a group of pulses of a 1st frequency, a 2nd beam 17 includes a group of pulses of a 2nd frequency and a beam having higher luminance than pulses of the 2nd beam 17 is generated with the pulses of the 1st beam 15. With specific information the pulses of the 1st beam 15 are modulated 18, the 2nd beam is combined to form 25 a 3rd beam 27, a 4th beam 31 is made from a nonlinear material 29 and includes pulses of 1st to 3rd frequencies and pulses of the 3rd frequency are generated from a special effect of mixed phase modulation. The pulses of the 1st frequency are removed through a filter 33, the 4th beam 31 is separated 35 into a 5th beam 37 and a 6th beam 39 and pulses existing in those beams are detected 45 and 47. Consequently, an optical communication system is obtained by using a principle of mixed phase modulation.
LIGHT COMPUTING SYSTEM OF TERAHERZ REPEATING RATE AND COMMUNICATION SYSTEM USING PHOTOPROCESSING DEVICE BASING ON MIXED PHASE MODULATION