| 摘要 |
<P>PROBLEM TO BE SOLVED: To achieve high reliability by enabling supervisory signal light (optical supervisory channel (OSC) light) to be reliably received, by reducing the effect of noise light caused by Raman-amplification, even when where the OSC light is Raman-amplified and then transmitted. <P>SOLUTION: An optical transmission apparatus includes an optical filter 71 on an optical path between a receiving end of a transmission line 1 and an OSC receiver 33, and the optical filter 71 has such a translucent property as to transmit through main signal light Ls and OSC light Losc and to cut off noise light contained in at least either a short wavelength side or long wavelength side terminal area of a transmission band in a demultiplexing section 31. <P>COPYRIGHT: (C)2010,JPO&INPIT |
