| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method and a device for controlling a gain of an optical fiber amplifier. <P>SOLUTION: A gain circuit uses a function determined in advance, which operates in an open loop configuration and associates power variation in at least one wavelength region with pump power adjustment for at least one optical pump. Two substantially linear relations between input signal power variation and required pump power adjustment are used to control a Raman fiber amplifier. The respective substantially linear relations include at least one linear coefficient that associates the power variation with the power adjustment of a specific Raman pump in a specific wavelength region. This dynamic gain control technique can be applied to an erbium doped fiber/waveguide amplifier. Further, in the dynamic gain control technique, the power variation is determined at a geographical place and the optical pump also controls an opposite direction pumping Raman amplifier controlled at another geographical place. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
