OPTISCHER VERSTÄRKUNGSWIEDERHOLER UND OPTISCHER VERSTÄRKUNGSWIEDERHOLER UND ÜBERTRAGUNGSANORDNUNG

摘要

Abstract: Simultaneously amplified optical signals of first through n-th bands are attenuated appropriately by an optical variable attenuator (3) in accordance with the attenuation of an optical fiber connected to the input of an optical amplification repeater, demultiplexed into the respective bands by means of an optical demultiplexer (2), amplified by fixed gain optical amplifiers (4a, 4b) having a high fixed gain for each band, and multiplexed by an optical multiplexer (7) before being outputted to a transmission line.A monitoring optical demultiplexer (5) extracts a part of the optical powder of a specific monitoring light and delivers it to a variable attenuator control circuit (6) in order to control the attenuation of the optical variable attenuator (3) such that the optical powder of the monitoring light may be constant. Since the gain of the optical amplification repeater at a specified wavelength is determined, the gains at the other wavelengths are fixed so long as a homogeneous medium is employed as an optical amplification medium, and therefore an optical amplification repeater having a gain insusceptible to variation in the number of wavelengths can be provided.