Patent ID: 6819875
Filing Date: 2004-11-16
Classification: H04B,H04J

Abstract:
An optical wavelength multiplexing transmission apparatus comprising:an up main signal light amplifying unit for amplifying a wavelength-multiplexed up main signal light to be transmitted to an up downstream-side station; an up sub-signal light transmitting unit for inserting up control information on a transmission situation into an up sub-signal light and for outputting the up control signal inserted sub-signal light to said up downstream-side station; an up sub-signal light receiving unit for receiving an up sub-signal light including up control information from an up upstream-side station to extract said up control information from said up sub-signal light; an up output monitoring unit operable to extract output levels of said up main signal light and said up sub-signal light outputted to said up downstream-side station; an up input monitoring unit operable to extract input levels of said up main signal light and said up sub-signal light inputted from said up upstream-side station; and an up control unit connected to said up main signal light amplifying unit, said up sub-signal light transmitting unit, said up sub-signal light receiving unit, said up output monitoring unit and said up input monitoring unit for calculating a loss in a transmission line on the basis of said up sub-signal light and for controlling an output level of said up main signal light, wherein said up control unit includes: a first control unit connected to said up main signal light amplifying unit and said up sub-signal light transmitting unit for calculating said loss on the basis of an output level of said up main signal light and a reception level of said sub-signal light received by said up downstream-side station to correct said output level of said up main signal light and for inputting said output level of said up sub-signal light and said output level of said up main signal light to said up sub-signal light transmitting unit, and a second control unit for outputting a reception level of said up main signal light received by said up downstream-side station, a reception level of said up sub-signal light received by said up downstream-side station, an expected value of an input level of said up main signal light amplified by said up downstream-side station and information on a difference between an input level of said up main signal amplified by said up downstream-side station and an input level of an up main signal light actually inputted.