Autonomous on-orbit calibration of a star tracker camera

All-fiber wavelength-tunable passive phasing of eight channels of fiber amplifiers using optical feedback loop

“…Coherent beam combining can be classified as active phasing and passive phasing. [14][15][16][17][20][21][22][23] Active phasing requires a complex phase control system consisting of phase modulators, a photoelectric detector, an electronic controller, and so forth. 8,14,24) On the other hand, passive phasing is notable for the simplicity of the phasing control, which is realized by optical feedback with a self-organizing mechanism.…”