| 摘要 |
The invention relates to an optical amplification device (10) with noise filter function. A body, composed of a plurality of layers (11-15) of different materials has electrodes (16) on its opposing sides. A first (12) and a second (14) of these layers is light wave conductive and forms a directional coupler with an interaction length (2L) consisting of two coupling lengths. The other (14) of the light wave conductive layers is a travelling wave amplifier which is pumped by an electric current (I) between the electrodes (16). The dispersion of the light wave conductors varies according to different relationships, and the effective refractive index has a common value (Neff0) for the wavelength intended for amplification. A light signal (Is, Ib) in the first waveguide (12) migrates transversely over to the second waveguide (14), where it is amplified and migrates back again to the first waveguide (12). At the same time there is noise filtration of the signal (Is, Ib) by a passband covering said wavelength. The noise filtered away is absorbed in the end portion (l2) of the second waveguide (14), and by the light being coupled in transversely in this waveguide the amplification device (19) will be free from reflection. |
