Hybrid waveguide-bulk multi-path interferometer with switchable amplitude and phase

Keil, Robert; Kaufmann, Thomas; Kauten, Thomas; Gstir, Sebastian; Dittel, Christoph; Heilmann, René; Szameit, Alexander; Weihs, Gregor

doi:10.1063/1.4960204

Cited by 14 publications

(5 citation statements)

References 39 publications

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“…5,65 Bend loss could be also reduced by scanning the WG track multiple times in all curved segments due to the tighter confinement of the modes caused by multiscan-induced large refractive index contrast. 66 Recently, Tan et al reported that the WG size can be controlled by adjusting the scanning passes [Figs. 6(a)-6(c)].…”

Section: Multiscanmentioning

confidence: 99%

Photonic circuits written by femtosecond laser in glass: improved fabrication and recent progress in photonic devices

et al. 2021

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Integrated photonics is attracting considerable attention and has found many applications in both classical and quantum optics, fulfilling the requirements for the ever-growing complexity in modern optical experiments and big data communication. Femtosecond (fs) laser direct writing (FLDW) is an acknowledged technique for producing waveguides (WGs) in transparent glass that have been used to construct complex integrated photonic devices. FLDW possesses unique features, such as three-dimensional fabrication geometry, rapid prototyping, and single step fabrication, which are important for integrated communication devices and quantum photonic and astrophotonic technologies. To fully take advantage of FLDW, considerable efforts have been made to produce WGs over a large depth with low propagation loss, coupling loss, bend loss, and highly symmetrical mode field. We summarize the improved techniques as well as the mechanisms for writing high-performance WGs with controllable morphology of cross-section, highly symmetrical mode field, low loss, and high processing uniformity and efficiency, and discuss the recent progress of WGs in photonic integrated devices for communication, topological physics, quantum information processing, and astrophotonics. Prospective challenges and future research directions in this field are also pointed out.

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Section: Multiscanmentioning

confidence: 99%

Photonic circuits written by femtosecond laser in glass: improved fabrication and recent progress in photonic devices

et al. 2021

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“…Development of optical integrated and fibre technology has enabled construction of multiports [8] and hence multiarm interferometers [9,10]. The integrated multiports are realised as directional couplers with arms expanding in two or three dimensions [11,12,10]. The principal feature of a directional coupler is the proximity of waveguides in its central region which allows for efficient transfer of energy between them.…”

Section: Introductionmentioning

confidence: 99%

Bend-free multiarm interferometers on optical chips

Petrovic

Maluckov²,

Stojanović³

2022

Opt Quant Electron

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Multiarm interferometers can enhance measurement precision and provide multiparameter capability to the measurement. Their realisation requires multiport beam splitters, which has been a long-standing challenge in free-space and integrated optics. Here, we propose a new type of multiport interferometers suitable for implementation on optical chips. Their prospective advantages over the standard directional-coupler architectures: an arbitrary number of arms, planar architecture and two orders of magnitude reduction in footprint, are achieved by the layout based exclusively on the finite modulated photonic lattices. The inverse design of photonic lattices is facilitated by restricting the light propagation to periodic patterns. The corresponding interferometer model predicts the maximum 1/ √ N sensitivity scaling with the number of arms N . While the presented design solutions are ubiquitous to all implementations, the advantages are discussed in both the low and high refractive-index contrast platforms. Finally, we provide an outlook on the possibilities for the interferometer applications in distributed classical and quantum measurements.

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“…In order to access the required amplitude combinations, each path can be individually blocked by mechanical shutters. Compared to free-space setups [17] or partially integrated solutions [27], the present setup provides much better phase stability, which is a prerequisite to obtain meaningful results. For an in-depth analysis of potential systematic errors, which would bias a Peres test with single photons, we probed the interferometer with bright coherent light with negligible shot noise.…”

Section: Introductionmentioning

confidence: 99%

Towards probing for hypercomplex quantum mechanics in a waveguide interferometer

Gstir,

Chan,

Eichelkraut

et al. 2021

Preprint

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We experimentally investigate the suitability of a multi-path waveguide interferometer with mechanical shutters for performing a test for hypercomplex quantum mechanics. Probing the interferometer with coherent light, we systematically analyse the influence of experimental imperfections that could lead to a false-positive test result. In particular, we analyse the effects of detector nonlinearity, input-power and phase fluctuations on different timescales, closed-state transmissivity of shutters and crosstalk between different interferometer paths. In our experiment, a seemingly small shutter transmissivity in the order of about 2 × 10 −4 is the main source of systematic error, which suggests that this is a key imperfection to monitor and mitigate in future experiments.

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Hybrid waveguide-bulk multi-path interferometer with switchable amplitude and phase

Cited by 14 publications

References 39 publications

Photonic circuits written by femtosecond laser in glass: improved fabrication and recent progress in photonic devices

Photonic circuits written by femtosecond laser in glass: improved fabrication and recent progress in photonic devices

Bend-free multiarm interferometers on optical chips

Towards probing for hypercomplex quantum mechanics in a waveguide interferometer

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