Patent ID: 9166726
Filing Date: 2015-10-20
Classification: H04J

Abstract:
1. A wavelength branching apparatus coupled to three or more stations, comprising: a first monitor configured to monitor an uplink signal received from each of the stations; an optical amplifier configured to, if a lack of the uplink signal received from any one of the stations is detected, output a dummy light beam on behalf of the lacked signal; an optical filter through which the dummy light from the optical amplifier is passed; a converter configured to convert the signal which is output from the optical filter into an electric signal; a second monitor configured to monitor the electric signal; a controller configured to control the dummy light from the optical amplifier on the basis of the monitoring result; a multiplexer configured to multiplex the dummy light beam and an uplink signal received from a station other than the any one of the stations; and a multiplexed signal output portion configured to output the multiplexed signal.