20 May 2015 Yb-fiber-MOPA based high energy and average power uplink laser beacon for deep space communication operating under Nested PPM format
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Abstract
A Yb LMA fiber amplifier based 1030nm laser transmitter capable of operating with high average power and peak power (~500W, 9kW) is presented. The prototype, all-fiber, high TRL level laser transmitter is designed to meet all the single aperture requirements of a multi aperture deep space laser beacon system including operation with Nested pulse position modulation (PPM) format. Nested PPM format consist of an inner modulation PPM- (8,4) with 128nsec slot size and an outer modulation PPM-(2, 2) 65.5usec slot size. Here, nested PPM operation is presented for the first time. In implementing inner modulation strong pre-pulse shaping is required where PPM pattern dependent pulse energy variation (PEV) is minimized. Outer modulation is implemented by directly modulating VBG locked pump lasers for the final two gain. A sophisticated multi-stage, ultra-fast loss of signal (LOS) and backward Raman/lasing monitoring algorithm is implemented for ensuring reliable operation. Mechanical and electrical design of the delivered laser is scalable to multiple apertures.
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Doruk Engin, Doruk Engin, John Burton, John Burton, Ibraheem Darab, Ibraheem Darab, Frank Kimpel, Frank Kimpel, Shantanu Gupta, Shantanu Gupta, } "Yb-fiber-MOPA based high energy and average power uplink laser beacon for deep space communication operating under Nested PPM format", Proc. SPIE 9466, Laser Technology for Defense and Security XI, 94660V (20 May 2015); doi: 10.1117/12.2177559; https://doi.org/10.1117/12.2177559
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