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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 6 — Mar. 25, 2013
  • pp: 7841–7850

Nearly degenerate wavelength-multiplexed polarization entanglement by cascaded optical nonlinearities in a PPLN ridge waveguide device

Shin Arahira and Hitoshi Murai  »View Author Affiliations

Optics Express, Vol. 21, Issue 6, pp. 7841-7850 (2013)

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In this paper we report the generation of wavelength-multiplexed polarization-entangled photon pairs in the 1.5-μm communication wavelength band by using cascaded optical second nonlinearities (sum-frequency generation and subsequent spontaneous parametric down-conversion, c-SFG/SPDC) in a periodically poled LiNbO3 ridge waveguide device. The c-SFG/SPDC method makes it possible to fully use the broad spectral bandwidth of SPDC in nearly frequency-degenerate conditions, and can provide more than 50 pairs of wavelength channels for the entangled photon pairs in the 1.5-μm wavelength band, using only standard optical resources in the telecom field. Visibilities higher than 98% were clearly observed in two-photon interference fringes for all the wavelength channels under investigation (eight pairs). We further performed a detailed experimental investigation of the cross-talk characteristics and the impact of detuning the pump wavelengths.

© 2013 OSA

OCIS Codes
(060.2330) Fiber optics and optical communications : Fiber optics communications
(270.4180) Quantum optics : Multiphoton processes
(270.5565) Quantum optics : Quantum communications

ToC Category:
Quantum Optics

Original Manuscript: March 6, 2013
Manuscript Accepted: March 8, 2013
Published: March 22, 2013

Shin Arahira and Hitoshi Murai, "Nearly degenerate wavelength-multiplexed polarization entanglement by cascaded optical nonlinearities in a PPLN ridge waveguide device," Opt. Express 21, 7841-7850 (2013)

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