| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an optical transmitting/receiving device for preventing disability of communication of the whole PON system, by detecting continuous output of optical signal accompanying failure or overrun. <P>SOLUTION: An optical output overrun preventive circuit 38 for stopping the transmission of an optical signal, if the optical signal is transmitted by the optical transmitting/receiving device 35 continuously more time than a previously set period, is provided. <P>COPYRIGHT: (C)2004,JPO |
