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2 results on '"Marcus Bagnell"'

1. Multiheterodyne Detection and Sampling of Periodically Filtered White Light for Correlations at 20 km of Delay

Author

Marcus Bagnell, Josue Davila-Rodriguez, Charles Williams, and Peter J. Delfyett

Subjects
Frequency combs, ultrafast measurements, mode-locked lasers, heterodyne, Applied optics. Photonics, TA1501-1820, Optics. Light, QC350-467
Abstract

A frequency comb is used as a set of coherent local oscillators to downconvert and spectrally compress white light that has been periodically filtered by a Fabry–Perot etalon. Multiheterodyne detection allows white light spread across 100 GHz of optical spectrum to be compressed to 5 GHz of radio frequency (RF) bandwidth for electronic sampling on an oscilloscope. Correlations are observed at delays of up to 20 km with a minimum resolution of less than 1 mm. Calculations show that resolution may be easily increased by increasing etalon finesse and frequency comb bandwidth.

Published
2012
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2. Millimeter-Wave Generation in an Optoelectronic Oscillator Using an Ultrahigh Finesse Etalon as a Photonic Filter

Author

Marcus Bagnell, Peter J. Delfyett, and Josue Davila-Rodriguez

Subjects
Physics, business.industry, Frequency drift, Astrophysics::Instrumentation and Methods for Astrophysics, Physics::Optics, Noise floor, Atomic and Molecular Physics, and Optics, Finesse, Optics, Extremely high frequency, Phase noise, Optoelectronics, Photonics, business, Fabry–Pérot interferometer, Free spectral range
Abstract

A Fabry-Perot etalon with a finesse of 100 000 is used as a photonic filter in a single loop optoelectronic oscillator. The etalon provides narrow bandwidth microwave filtering at harmonics of its 1.5 GHz free spectral range for oscillation in the range of 6 to 60 GHz. Fiber delays as long as 2 km are added to the loop with no spurious modes visible above the noise floor. The environmental stability of the etalon makes it suitable as a secondary reference for feedback to the optical frequency which contributes to the reduction of phase noise and long term frequency drift.

Published
2014
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