Numerical analysis of passive integrated-optical polarization splitters: comparison of finite-element method and beam-propagation method results

Bersiner, L.; Hempelmann, Uwe; Strake, E.

doi:10.1364/josab.8.000422

Cited by 22 publications

(11 citation statements)

References 16 publications

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“…In order to separate signal and idler photons spatially, we implemented a passive demultiplexer (WDM coupler) behind the periodically poled area. The most accurate way to treat a waveguide directional coupler is to describe its properties in terms of local normal modes of the dual channel structure [38][39][40]. In our case the local normal modes comprise a symmetric (00) and an anti-symmetric (10) mode, as shown in figure 3.…”

Section: The Second Building Block-the Wavelength Division Demultiplementioning

confidence: 99%

An efficient integrated two-color source for heralded single photons

et al. 2013

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We present a pulsed and integrated, highly non-degenerate parametric down-conversion (PDC) source of heralded single photons at telecom wavelengths, paired with heralding photons around 800 nm. The active PDC section is combined with a passive, integrated wavelength division demultiplexer on-chip, which allows for the spatial separation of signal and idler photons with efficiencies of more than 96.5%, as well as with multi-band reflection and antireflection coatings which facilitate low incoupling losses and a pump suppression at the output of the device of more than 99%. Our device is capable of preparing single photons with efficiencies of 60% with a coincidences-to-accidentals ratio exceeding 7400. Likewise, it shows practically no significant background noise compared to continuous wave realizations. For low pump powers, we measure a conditioned second-order correlation function of g (2) = 3.8 × 10 −3 , which proves almost pure single-photon generation. In addition, our source can feature a high brightness of n pulse = 0.24 generated photon pairs per pump pulse at pump power levels below 100 µW. The high quality of the pulsed PDC process in conjunction with the integration of highly efficient passive elements makes our device a promising candidate for future quantum networking applications, where an efficient miniaturization plays a crucial role.Recent progress in the field of quantum information processing has highlighted the prospects of using integrated optic devices for quantum applications [1][2][3][4][5]. Integrated quantum photonics offers several advantages in comparison with free-space experimental setups with bulk optic components [6]. The miniaturization of systems with increased complexity not only drastically reduces the required space and paves the way for future commercialization, but also enables the implementation of optical networks with a large number of optical modes and an extremely high stability.In 2008 Politi et al [7] demonstrated the first quantum interference and photonic gates onchip, whereas different groups developed sophisticated and integrated experiments with twophoton interference [8,9] or photon entanglement [10,11], controlled qubit operations [12] and the controlled phase shifts in linear optical circuits [5,13]. In 2012, Metcalf et al [14] realized the first three-photon experiment inside a linear optical network, and recent research on boson sampling in an integrated device demonstrates four-photon quantum interference [15].However, in all these experiments the preparation of the photon pairs has actually been performed outside the integrated devices employing traditional bulk crystal parametric downconversion (PDC) sources. The efficient coupling between these sources and the integrated circuit remains a bottleneck for designing systems with increasing complexity.On the other hand, remarkable efforts have been devoted to the development of integrated PDC sources for photon pair generation inside channel waveguides [16-23] over the last few decades. The main benefits of...

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Section: The Second Building Block-the Wavelength Division Demultiplementioning

confidence: 99%

An efficient integrated two-color source for heralded single photons

et al. 2013

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“…In the optical frequency range, the ordinary and extraordinary refractive index profiles of the Ti : LiNbO optical waveguide and are given by [17], [18] (33) …”

Section: Numerical Resultsmentioning

confidence: 99%

“…For the left one, is replaced by with being the waveguide separation. According to [7], [17], and [18], the operating wavelength is assumed to be m, and , , , , the quasi-TM optical mode propagation is chosen.…”

Section: Numerical Resultsmentioning

confidence: 99%

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Finite-element modeling of broad-band traveling-wave optical modulators

Koshiba

Tsuji

Nishio

1999

IEEE Trans. Microwave Theory Techn.

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Abstract-A full-wave finite-element method with hybrid edge/ nodal elements is, for the first time, applied to investigating the frequency dispersion of microwave propagation characteristics of broad-band traveling-wave (TW) optical modulators using planar electrode configurations. In order to produce a two-step analysis of electrooptic modulation of optical waveguides, the microwave electrode solver is linked to the optical waveguide solver. Numerical results are shown for an ultrabroad-band TW LiNbO 3 Mach-Zehnder optical modulator with a ridge structure, and the necessity of using the full-wave solver is verified by comparing the calculated 3-dB bandwidth and half-wavelength voltage with the experimental data.Index Terms-Coplanar waveguide, finite-element method, fullwave analysis, microwave photonic device, traveling-wave optical modulator.

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“…where the scalar field ψ is proportional either to the y component of the transverse electric (TE) field, is given by the sum of the substrate index and local index increase [8][9][10] and N is the effective mode refractive-index.…”

Section: Eigenvalue Equation and Fields Solutionmentioning

confidence: 99%

Influence of SiO 2 /In 2 O 3 film acoustical waveguide on the mode index of Ti:LiNbO 3 optical waveguide in acousto-optical mode converter

2004

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TE/TM mode converter is a key element of integrated acoustooptical tunable filter (AOTF). Employing SiO 2 /In 2 O 3 film as acoustical waveguide can suppress sidelobes effectively and simplify fabrication technique in integrated quasi-collinear AOTF. In this report, the eigenvalue equation and the field solution of such configuration has been obtained by using modified Wenzel-Kramers-Brillouin (WKB) method. The results are compared with those by using vector finite element method (VFEM). When the optical waveguides are covered by such oxide film, the difference of mode indices of both polarizations and the effective propagation velocity of surface acoustical wave (SAW) will decrease, and these decreases lead the shift of optical wavelength, which mainly results in the change of the former. Key words: acoustooptical tunable filter (AOTF); vector finite element method (VFEM); Wenzel-Kramers-Brillouin (WKB) method; surface acoustical wave (SAW).

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Numerical analysis of passive integrated-optical polarization splitters: comparison of finite-element method and beam-propagation method results

Cited by 22 publications

References 16 publications

An efficient integrated two-color source for heralded single photons

An efficient integrated two-color source for heralded single photons

Finite-element modeling of broad-band traveling-wave optical modulators

Influence of SiO 2 /In 2 O 3 film acoustical waveguide on the mode index of Ti:LiNbO 3 optical waveguide in acousto-optical mode converter

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