Patent ID: 8290361
Filing Date: 2012-10-16
Classification: H04B,H04J

Abstract:
1. A transmission path monitoring system comprising: A station; B station; C C optical separating/combining section; said A station, said B station, said C wherein said optical fibers comprises: a first main optical transmission path wherein a first wavelength division multiplexing signal that is transmitted from said A station to said B station is transmitted; a first add optical transmission path wherein a first add signal that is transmitted from said C a first drop optical transmission path wherein a first drop signal that is dropped from said first main optical transmission path to said C1 station; a first monitor signal optical transmission path which connects said first add optical transmission path to said first drop optical transmission path; a second main optical transmission path wherein a second wavelength division multiplexing signal that is transmitted from said B station to said A station is transmitted; a second add transmission path wherein a second add signal that is transmitted from said C a second drop optical transmission path wherein a second drop signal that is dropped from said second main optical transmission path to said C a second monitor signal optical transmission path which connects said second add optical transmission path to said second drop optical transmission path, wherein said optical separating/combining section comprises: a first adding unit; and a first dropping unit; wherein said first adding unit comprises: a separating unit configured to separate the monitor signal and the first add signal from a signal transmitted on said first add transmission path and allow the separated monitor signal to be transmitted on said first monitor signal optical transmission path; and a combining unit configured to combine the first add signal separated by said separating unit with the first wavelength division multiplexing signal, and said first dropping unit comprises: a separating unit configured to separate the first drop signal from the first wavelength division multiplexing signal; and a combining unit configured to combine the monitor signal transferred by said first monitor signal optical transmission path with the first drop signal separated by said separating unit and allow the combination signal to be transmitted on said first drop optical transmission path.