Physics – Optics
Scientific paper
Oct 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004spie.5578...40t&link_type=abstract
Photonics North 2004: Optical Components and Devices. Edited by Armitage, John C.; Fafard, Simon; Lessard, Roger A.; Lampropoul
Physics
Optics
Scientific paper
For almost three decades, the problem of coupling light into a single-mode fiber or waveguide has been studied extensively both from the theoretical and experimental points of view. Today, commercial optical design software permit an accurate evaluation of single-mode fiber-coupling efficiency to be performed for various systems. More specifically, optical communication (satelllite-to-satellite or satellite-to-ground) and stellar interferometry (ground- or space-based) are the two main categories of applications that are discussed here. Coupling theory has recently been the subject of renewed attention due to the use of single-mode fibers in stellar interferometers, where wavefront aberrations caused by atmospheric turbulences have an impact on fiber-coupling efficiency, stability and phase. This impact, and the extent to which it can be minimized with adaptive optics, is a crucial piece of information for this application. Advanced fiber-coupling devices (AFCD), incorporating an adaptive optics system, are necessary to achieve the performance goals. Applications not involving atmospheric propagation, although in principle simpler, nevertheless present optical design challenges due to the low level of insertion loss sometimes required. Such applications would greatly benefit from a coupling system that reshapes the irradiance distribution in the coupled beam in order to better match the Gaussian mode of the single-mode fiber, and thus achieve higher coupling efficiency.
Lacoursière Jean
Thibault Simon
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