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Proceedings Paper

Yb-fiber-MOPA based high energy and average power uplink laser beacon for deep space communication operating under Nested PPM format
Author(s): Doruk Engin; John Burton; Ibraheem Darab; Frank Kimpel; Shantanu Gupta
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Paper 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.

Paper Details

Date Published: 20 May 2015
PDF: 12 pages
Proc. SPIE 9466, Laser Technology for Defense and Security XI, 94660V (20 May 2015); doi: 10.1117/12.2177559
Show Author Affiliations
Doruk Engin, Fibertek, Inc. (United States)
John Burton, Fibertek, Inc. (United States)
Ibraheem Darab, Fibertek, Inc. (United States)
Frank Kimpel, Fibertek, Inc. (United States)
Shantanu Gupta, Fibertek, Inc. (United States)


Published in SPIE Proceedings Vol. 9466:
Laser Technology for Defense and Security XI
Mark Dubinskii; Stephen G. Post, Editor(s)

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