| 摘要 |
<P>PROBLEM TO BE SOLVED: To allow faults to be detected in a short period of time, in all individual fiber lines of a WDN-PON (Wavelength Division Multiplexing-Passive Optical Network) system using wavelength-fixed branching device. <P>SOLUTION: A wide band optical pulse Pw including all the wavelengths of signal light is generated by a wide band optical pulse generation means 22 and is made incident on the WDN-PON system where individual optical fiber lines 18<SB>1</SB>to 18<SB>n</SB>respectively corresponding to wavelengths of signal light are different, in a communication stop period of the WDN-PON system. Return light Pr from the WDN-PON system with respect to the wide band optical pulse Pw is received by a light receiver 25, and a time waveform of the received optical signal is acquired by a time waveform storage means 27. The latest time waveform is compared with a reference waveform acquired in a normal state and stored in a reference waveform storage means 28 by a fault detection means 29, whereby faults of the WDN-PON system are searched. <P>COPYRIGHT: (C)2011,JPO&INPIT |
