A device for the amplification of optical signals comprises a light-sensitive medium receiving a modulated signal optic wave and a pump wave, in which the response time of the light-sensitive medium is substantially greater than the mean period for the modulation of the signal wave. The device can be...http://www.google.com.au/patents/US4847521?utm_source=gb-gplus-sharePatent US4847521 - Device for the amplification of light-sensitive
