Patent ID: 8032028
Filing Date: 2011-10-04
Classification: G02F,H04J

Abstract:
1. An optical add/drop device used in an optical network having a first optical transmission path and a second optical transmission path for transmitting signals in the opposite directions to each other, a plurality of the optical add/drop devices being connected to each other by the first optical transmission path and the second optical transmission path, the optical add/drop device comprising: an optical splitter to split an input optical signal to generate a first split signal and a second split signal; an optical add unit to add the first split signal to the first optical transmission path and to add the second split signal to the second optical transmission path; at least one amplifier in the first optical transmission path or the second optical transmission path; an optical transmitter to generate the input optical signal; and an adjustment unit, provided between said optical transmitter and said optical splitter, to adjust the optical power of the optical signal output from said optical transmitter, wherein the adjustment unit adjusts the optical power of the optical signal and said optical splitter splits the input optical signal at a split ratio such that the optical power of a signal added to the first optical transmission path through another optical add/drop device and the amplifier or through another optical add/drop device and the optical power of the first split signal are equal to or approximately equal to each other on the first optical transmission path, and such that the optical power of a signal added to the second optical transmission path through another optical add/drop device and the amplifier or through another optical add/drop device and the optical power of the second split signal are equal to or approximately equal to each other on the second optical transmission path.