Optical fiber transmission method and device

The invention provides an optical fiber transmission method and an optical fiber transmission device. The method comprises the steps of detecting corresponding current optical power after an initial optical signal is amplified, judging whether the current optical power meets a triggering condition, when the triggering condition is met, judging whether a current gain corresponding to the current optical power is within an optimal gain range, if the current gain is within the optical gain range, after attenuating the current optical power to standard optical power, outputting an optical signal corresponding to the standard optical power, wherein the standard optical power is a standard value of the initial power after being amplified by a preset gain. Therefore, an optical power value and the gain of the optical signal in optical fiber transmission can be controlled in real time, so as to be adjusted to the best optical power value and gain, stable transmission and low noise are achieved, and at last, the ampli