22 February 2012 Short-wavelength (1010-1030nm) Yb-fiber-MOPA-based multi-aperture high-power uplink laser beacons for space communication
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KW level fiber based MOPA laser system at 1018-1024nm for uplink deep space communication is developed and characterized. System achieves 5kW peak power (300W average power) with >75% optical conversion efficiency at 1024nm. Experiments with 9-ary PPM pulse format at 500 kHz are presented. Pattern dependent pulse energy variation <10% is achieved using pulse pre-shaping algorithm. Lower PRF performance of the system where ASE accumulation along MOPA chain results in reduction in efficiency is characterized. Excellent agreement is established between dynamic fiber MOPA simulation tool and experimental results in predicting pulse shapes and ASE accumulation. Using the simulation tool robust MOPA performance is predicted at 500W, 500 kHz (16-ary PPM ) for the current system with minor component improvements. Simulation tool is also shown to be well suited for quantifying statistical performance of open loop pulse shape correction algorithms.
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Doruk Engin, Wei Lu, Frank Kimpel, and Shantanu Gupta "Short-wavelength (1010-1030nm) Yb-fiber-MOPA-based multi-aperture high-power uplink laser beacons for space communication", Proc. SPIE 8246, Free-Space Laser Communication Technologies XXIV, 82460K (22 February 2012); doi: 10.1117/12.909656; https://doi.org/10.1117/12.909656

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