| 摘要 |
PURPOSE:To amplify the optical signals having the different wavelengths propagating into two directions with a single amplifier by connecting four three-terminal optical- wave synthesizing and dividing devices having the different band characteristics and the equal feature in a ring shape, connecting the optical amplifier to the wave synthesizing terminal located at a bridge, and using the remaining wave synthesizing terminals as the input/output terminals of signals. CONSTITUTION:With respect to three-terminal optical-wave synthesizing and dividing devices 301-304, long-wave length terminals (c) and (e) of the optical-wave synthesizing and dividing devices 301 and 302 are connected. Short-wave length terminals (f) and (h) of the optical-wave synthesizing and dividing devices 302 and 303 are connected. The output light from an optical amplifier 305 is connected so that the propagating direction is separated based on the wavelength of the optical wave. The optical signal having the long wavelength cast from a terminal (a) is outputted to a terminal (g) through the optical amplifier 305 and the optical-wave synthesizing and dividing devices 304 and 303. The short-wavelength input light from the terminal (g) is outputted from the terminal (a) through the optical-wave synthesizing and dividing devices 304 and 301. Thus, the optical signals, which are propagating into two directions, can be stably amplified with one optical amplifier. |
