Origin of spectral modal noise in fiber-coupled spectrographs

Details Origin of spectral modal noise in fiber-coupled spectrographs Origin of spectral modal noise in fiber-coupled spectrographs

Jan 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006apopt..45..519c&link_type=abstract

Applied Optics IP, vol. 45, Issue 3, pp.519-527

Physics

Optics

2

Fiber Optics Links And Subsystems, Spectrometers And Spectroscopic Instrumentation, Astronomical Optics

Scientific paper

We describe the origin of spectral modal noise in a fiber-coupled spectrograph. Prior investigations of this phenomenon have considered optical fibers with large cores that support thousands of optical modes and used a statistical treatment to analyze spectral noise that arises from interference between the modes. We examine spectral modal noise for a fiber-coupled spectrograph with a smaller-diameter fiber core, optimized for adaptively corrected telescopes, that supports only a few propagating modes for visible and near-infrared light. Simulations to predict the minimum amount of fiber stretch required to shift spectral oscillations by a half-period are confirmed by experiment.

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