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Proceedings Article

A coherent fiber-array-based laser link for atmospheric aberration mitigation and power scaling

[+] Author Affiliations
Hans Bruesselbach, Monica L. Minden, Shuoqin Wang, D. Cris Jones, Metin S. Mangir

HRL Labs., LLC (USA)

Proc. SPIE 5338, Free-Space Laser Communication Technologies XVI, 90 (June 16, 2004); doi:10.1117/12.529660
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From Conference Volume 5338

  • Free-Space Laser Communication Technologies XVI
  • G. S. Mecherle; Cynthia Y. Young; John S. Stryjewski
  • San Jose, Ca | January 25, 2004

abstract

We report a laser link that can correct atmospheric aberrations. We use a fiber collimator array, fed by a master oscillator with multiple fiber amplifiers (MOMA), and accomplish phase adjustment via pump diode current control. Each of seven channels is tagged by a different 1-20 kHz diode current dither. At the receiver, each channel's phase information is extracted from the <50 kHz signal. Our measurements show 5 kHz phase adjustment capability, so even turbulence-induced aberrations, as well as typical atmospheric aberrations (< 200 Hz) can be corrected. Only in >~100 km-range scenarios is the correction bandwidth limited by light's travel time. The low dither frequencies and amplitudes do not interfere with the typically GHz laser communications signal. Importantly, our system reduces transmitter power requirements by correcting small pointing errors and atmospheric-path aberrations. Of course the multiple-fiber amplifier array also enables power scaling. We describe our near- and far-field beam measurements in the laboratory.

© (2004) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

Hans Bruesselbach ; Monica L. Minden ; Shuoqin Wang ; D. Cris Jones and Metin S. Mangir
"A coherent fiber-array-based laser link for atmospheric aberration mitigation and power scaling", Proc. SPIE 5338, Free-Space Laser Communication Technologies XVI, 90 (June 16, 2004); doi:10.1117/12.529660; http://dx.doi.org/10.1117/12.529660


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