Modal noise in an integrated photonic lantern fed diffraction-limited spectrograph

N. Cvetojevic, N. Jovanovic, S. Gross, B. Norris, I. Spaleniak, C. Schwab, M. J. Withford, M. Ireland, P. Tuthill, O. Guyon, F. Martinache, J. S. Lawrence

Research output: Contribution to journalArticleResearchpeer-review

Abstract

In an attempt to develop a streamlined astrophotonic instrument, we demonstrate the realization of an all-photonic device capable of both multimode to single mode conversion and spectral dispersion on an 8-m class telescope with efficient coupling. The device was a monolithic photonic spectrograph which combined an integrated photonic lantern and an efficient arrayed waveguide grating device. During on-sky testing, we discovered a previously unreported type of noise that made spectral extraction and calibration extremely difficult. The source of the noise was traced to a wavelength-dependent loss mechanism between the feed fiber’s multimode near-field pattern and the modal acceptance profile of the integrated photonic lantern. Extensive modeling of the photonic components replicates the wavelength-dependent loss, and demonstrates an identical effect on the final spectral output. We outline that this could be mitigated by directly injecting into the integrated photonic lantern.

LanguageEnglish
Pages25546-25565
Number of pages20
JournalOptics Express
Volume25
Issue number21
DOIs
Publication statusPublished - 16 Oct 2017

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spectrographs
photonics
diffraction
wavelengths
acceptability
sky
near fields
gratings
telescopes
waveguides
fibers
output
profiles

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Cvetojevic, N. ; Jovanovic, N. ; Gross, S. ; Norris, B. ; Spaleniak, I. ; Schwab, C. ; Withford, M. J. ; Ireland, M. ; Tuthill, P. ; Guyon, O. ; Martinache, F. ; Lawrence, J. S. / Modal noise in an integrated photonic lantern fed diffraction-limited spectrograph. In: Optics Express. 2017 ; Vol. 25, No. 21. pp. 25546-25565.
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Cvetojevic, N, Jovanovic, N, Gross, S, Norris, B, Spaleniak, I, Schwab, C, Withford, MJ, Ireland, M, Tuthill, P, Guyon, O, Martinache, F & Lawrence, JS 2017, 'Modal noise in an integrated photonic lantern fed diffraction-limited spectrograph', Optics Express, vol. 25, no. 21, pp. 25546-25565. https://doi.org/10.1364/OE.25.025546

Modal noise in an integrated photonic lantern fed diffraction-limited spectrograph. / Cvetojevic, N.; Jovanovic, N.; Gross, S.; Norris, B.; Spaleniak, I.; Schwab, C.; Withford, M. J.; Ireland, M.; Tuthill, P.; Guyon, O.; Martinache, F.; Lawrence, J. S.

In: Optics Express, Vol. 25, No. 21, 16.10.2017, p. 25546-25565.

Research output: Contribution to journalArticleResearchpeer-review

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AU - Jovanovic, N.

AU - Gross, S.

AU - Norris, B.

AU - Spaleniak, I.

AU - Schwab, C.

AU - Withford, M. J.

AU - Ireland, M.

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AU - Guyon, O.

AU - Martinache, F.

AU - Lawrence, J. S.

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