| 摘要 |
A method and system for phase locking a multi-stage parallel fiber amplifier 200 comprises receiving a signal beam 104 of a first wavelength from a first stage of the amplifier onto a fiber that is pumped by a second wavelength to produce a saturated signal beam. . A characteristic of the of the saturated signal beam is that its phase and amplitude do not substantially change based on the amplitude of the signal beam input onto the fiber. The method further detects a portion of the amplified beam from the second stage to roduce a phase indication of the amplified beam relative to amplified beams of the other paths of the multi-stage fiber amplifier. The method modulates the pump level of the first stage to control the phase of amplified beam, and further controls the phases of the other amplified beams of the other paths to phase loch the multi-stage parallel amplifier. The saturated signal beam reduces phase changes in the second stage that would be opposite to, and therefore counteract, the phase changes intentionally modulated in the first stage. |
