| 摘要 |
A bidirectionally amplifying rare earth doped fiber optical amplifier having an equalized gain at multiple wavelengths is disclosed for use in dense wavelength multiplexed bidirectional fiber transmission applications. In a first embodiment a four port (P1, P2, P3, P4) circulator (5) is utilized with two amplifying fibers (6A, 6B) one for each direction of propagation and a multiplicity of gratings (3A, 3B) configured to equalize the gain at the different wavelengths. Different embodiments utilizing three port and four port circulators are utilized. A more general amplifier device with equal gain at multiple wavelengths is disclosed. |
