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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 17 — Aug. 15, 2011
  • pp: 16032–16043

Generation of polarization entangled photon pairs at telecommunication wavelength using cascaded χ(2) processes in a periodically poled LiNbO3 ridge waveguide

Shin Arahira, Naoto Namekata, Tadashi Kishimoto, Hiroki Yaegashi, and Shuichiro Inoue  »View Author Affiliations

Optics Express, Vol. 19, Issue 17, pp. 16032-16043 (2011)

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We report the generation of high-purity correlated photon-pairs and polarization entanglement in a 1.5 μm telecommunication wavelength-band using cascaded χ(2)(2) processes, second-harmonic generation (SHG) and the following spontaneous parametric down conversion (SPDC), in a periodically poled LiNbO3 (PPLN) ridge-waveguide device. By using a PPLN module with 600%/W of the SHG efficiency, we have achieved a coincidence-to-accidental ratio (CAR) higher than 4000 at 7.45×10−5 of the mean number of the photon-pair per pulse. We also demonstrated that the maximum reach of the CAR was truly dark-count-limited by the single-photon detectors used here. This indicates that the fake (noise) photons were negligibly small in this system, even though the photon-pairs, the Raman noise photons, and the pump photons were in the same wavelength band. Polarization entangled photon pairs were also generated by constructing a Sagnac-loop-type interferometer which included the PPLN module and an optical phase-difference compensator to observe maximum entanglement. We achieved two-photon interference visibilities of 99.6% in the H/V basis and 98.7% in the diagonal basis. The peak coincidence count rate was approximately 50 counts per second at 10−3 of the mean number of the photon-pair per pulse.

© 2011 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: July 5, 2011
Revised Manuscript: July 29, 2011
Manuscript Accepted: August 2, 2011
Published: August 8, 2011

Shin Arahira, Naoto Namekata, Tadashi Kishimoto, Hiroki Yaegashi, and Shuichiro Inoue, "Generation of polarization entangled photon pairs at telecommunication wavelength using cascaded χ(2) processes in a periodically poled LiNbO3 ridge waveguide," Opt. Express 19, 16032-16043 (2011)

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