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Optical wavelength meter with machine learning enhanced precision

Photonics Research 2023年第3期11卷 420-430页

作者： GAZI MAHAMUD HASAN MEHEDI HASAN PENG LIU MOHAMMAD RAD eric bernier TREVOR JAMES HALL Photonic Technology Laboratory Advanced Research ComplexUniversity of OttawaK1N 6N5 OntarioCanada Huawei Technologies Canada KanataK2K 3J1 OntarioCanada

A photonic implementation of a wavelength meter typically applies an interferometer to measure the frequencydependent phase shift provided by an optical delay *** work shows that the information to be retrieved is encoded by a vector restricted to a circular cone within a 3D Cartesian object *** measured data belong to the image of the object space under a linear orthogonal *** impairments result in broken orthogonal symmetry,but the mapping remains *** circular cone is retained as the object space,which suggests that the conventional conic section fitting for the wavelength meter application is a premature reduction of the object space from R^(3)to R^(2).The inverse map,constructed by a learning algorithm,compensates impairments such as source intensity fluctuation and errors in delay time,coupler transmission,and photoreceiver sensitivity while being robust to *** simple algorithm does not require initial estimates for all parameters except for a broad bracket of the delay;further,weak nonlinearity introduced by uncertain delay can be corrected by a robust golden search *** phase-retrieval process is invariant to source power and its *** demonstrate that,to the extent that the ten parameters of the interferometer model capture all significant impairments,a precision limited only by the level of random noise is *** to measured data collected from a fabricated Si_(3)N_(4)wavelength meter,greater than an order of magnitude improvement in precision compared with the conventional method is achieved.

关键词： delay circular invariant

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Silicon slow light photonic crystals structures:present achievements and future trends

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Frontiers of Optoelectronics 2011年第3期4卷 243-253页

作者： eric CASSAN Xavier LE ROUX Charles CAER Ran HAO Damien bernier Delphine MARRIS-MORINI Laurent VIVIEN Institut d'Electronique Fondamentale Université Paris-Sud CNRS UMR 8622

Slow light in planar photonic structures has attracted for some years an increasing interest due to amazing physical effects it allows or reinforces and to the degrees of freedom it raises for designing new optical functions. Controlling light group velocity is achieved through the use of periodical optical media obtained by nano-structuration of semiconductor wafers at the scale of light wavelength: the so-called photonic crystals. This article reviews present achievements realized in the field of slow light photonic bandgap structures, including the physical principles of slow light to the description of the most advanced integrated optical devices relying on *** and current hot topics related to slow light are discussed to highlight the balance between the advantages and drawbacks of using slow waves in integrated photonic structures. Then, future trends are described, which is focused on the use of slow wave slot waveguides for nonlinear optics and bio-photonic applications.

关键词： slow light photonic crystals silicon photonics integrated optical devices

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