500 Gb/s free-space optical transmission over strong atmospheric turbulence channels

Research output: Contribution to journalArticle

40 Citations (Scopus)

Abstract

We experimentally demonstrate a high-spectral-efficiency, large-capacity, featured free-space-optical (FSO) transmission system by using low-density, parity-check (LDPC) coded quadrature phase shift keying (QPSK) combined with orbital angular momentum (OAM) multiplexing. The strong atmospheric turbulence channel is emulated by two spatial light modulators on which four randomly generated azimuthal phase patterns yielding the Andrews spectrum are recorded. The validity of such an approach is verified by reproducing the intensity distribution and irradiance correlation function (ICF) from the full-scale simulator. Excellent agreement of experimental, numerical, and analytical results is found. To reduce the phase distortion induced by the turbulence emulator, the inexpensive wavefront sensorless adaptive optics (AO) is used. To deal with remaining channel impairments, a large-girth LDPC code is used. To further improve the aggregate data rate, the OAM multiplexing is combined with WDM, and 500 Gb/s optical transmission over the strong atmospheric turbulence channels is demonstrated.

Original languageEnglish (US)
Pages (from-to)3285-3288
Number of pages4
JournalOptics Letters
Volume41
Issue number14
DOIs
StatePublished - Jul 15 2016

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atmospheric turbulence
multiplexing
parity
angular momentum
orbitals
quadrature phase shift keying
impairment
light modulators
adaptive optics
irradiance
simulators
turbulence

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

500 Gb/s free-space optical transmission over strong atmospheric turbulence channels. / Qu, Zhen; Djordjevic, Ivan B.

In: Optics Letters, Vol. 41, No. 14, 15.07.2016, p. 3285-3288.

Research output: Contribution to journalArticle

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