| 摘要 |
<P>PROBLEM TO BE SOLVED: To alleviate a cost burden of a subscriber side to a communication service, in a light transmission system for providing various type communication services, such as CATV and the Internet, etc. that use optical signals. <P>SOLUTION: The light transmission system 1 includes an optical signal (wavelength λ1), transmitted and received between the center side of a CATV entrepreneur who provides a communication service and a service subscriber side of the communication service, and a WDM filter 21 for discriminating the optical signal (wavelengths λ2, λ3), installed in a relay unit 200. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
