| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a reflection type optical communication system or the like capable of enhancing the transmission efficiency of an uplink optical signal and of improving a code error rate. <P>SOLUTION: A station K transmits a continuous light Pc and a downlink optical signal Pd to a user terminal U via an optical fiber 104. A downlink optical signal receiver 107 of the user terminal U receives the downlink optical signal Pd. Further, an optical limiter amplifier 114 decreases the extinction ratio of the downlink optical signal Pd. A reflection type optical modulator 106 modulates the continuous light Pc to generate an active uplink optical signal Pu1 and modulates the downlink optical signal Pd the extinction ratio of which is decreased to generate a standby uplink optical signal Pu2. The two optical signals Pu1, Pu2 are transmitted to the station K wherein an uplink optical signal receiver 108 receives the signals. When the same signal is assigned to the optical signals Pu1, Pu2, the station K compares the optical signals Pu1, Pu2 to determine the propriety of the states of the signals, thereby enhancing the code error rate. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
