Transmission method and amplified spectral multiplexed optical link.

摘要

The method includes dividing amplifier gain between several multiplexed carrier waves. The desired division is maintained when the number and/or power of the carrier waves move away from predetermined values. The power of the amplified light is independent of the carrier waves and the gain division gives the same amplification to all the carrier waves. An amplified laser light is passed to a coupler (16) which detects the power from a fibre optic amplifier (10). The signal is optically filtered (24) and passed to a photodiode (18). A voltage level output from the photodiode is input to an amplifier (20) and regulator (22). Signals from the regulator pass to two laser pumps (12,14). Varying the voltage input to the laser pumps adjusts gain to the overall level required for the channels used.