| 摘要 |
<p>An intermediate amplifier for a transmission system intended for communications transmission applications using light waves in optical wave guides employs an optical amplifier for amplifying the light waves on the laser principle, wherein an optical filter is provided to restrict the frequency band of the optical amplifier to the frequency band of the pulses being transmitted. The filter comprises a dielectric multi-layer system arranged upon an inclined surface of the optical amplifier through which the signal light passes in one embodiment. In another embodiment the filter is a zone of the output wave guide of the amplifier which has an absorption characteristic outside of the frequency band of the light pulses which are to be transmitted.</p> |
