Analysis of optical waveguide discontinuities

Rahman, B. M. A.; Davies, J.B.

doi:10.1109/50.3963

Cited by 91 publications

(36 citation statements)

References 24 publications

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“…To solve this problem, various types of fan-in fan-out (FIFO) schemes have been recently proposed, such as fiber bundled type [9], physical contact method [10], grating coupler array based FIFO [11], and coupling with lens optics [12]. However, it has also been reported that the least squares boundary residual (LSBR) method [13] would be more efficient and accurate to use to analyze the coupling losses due to misalignments between MCF and SCF.…”

Section: Introductionmentioning

confidence: 99%

“…In order to calculate the power coupling between MCF OI and SC-SMF computationally efficient vector FEM [14] and LSBR method [13] is used. The LSBR method looks for a stationary solution to satisfy the continuity conditions by minimizing the error energy functional, J, as given by [13] .,…”

Section: Calculation Of Coupling Loss Due To Misalignmentmentioning

confidence: 99%

“…The optimal design is based on strong mode confinement capability of TA-MCF OI to reduce the intercore XT. Subsequently, the modal solution approach based on the numerically efficient FEM [14] and the LSBR method [13] have been used to calculate the coupling loss caused by the misalignment between TA-MCF OI and SCF.On the other hand, design optimization of the asymmetric directional coupler (ADC)for SOI mode (de)multiplexer is presented by using the full-vectorial H-field FEM. The width of multi-mode nanowire is optimized following the phase matching condition.…”

Section: Introductionmentioning

confidence: 99%

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Design and optimization of photonic devices and optical fibers for space-division multiplexing

Rahman

Mishra

Pan

2018

Metro and Data Center Optical Networks and Short-Reach Links

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Citation: Rahman, B. M. ORCID: 0000-0001-6384-0961, Mishra, J. K. and Pan, C.(2018). Design and optimization of photonic devices and optical fibers for space-division multiplexing. Proceedings of SPIE, 10560, 1056007.. doi: 10.1117/12.2291522 This is the accepted version of the paper.This version of the publication may differ from the final published version. Permanent ABSTRACTAlthough, the technological breakthroughs such as WDM had allowed the capacity per fiber to be increased around tenfold every four years in the past decade, however, the capacity of the optical communication systems based on these transmission technologies is slowly becoming saturated. To satisfy the exponential growth of the Internet traffic, for the next generation short reach systems, including data center transmission and optical interconnect (OI) applications, the space-division multiplexing (SDM) can be a way forward. The SDM technology based on the multicore fiber (MCF) has recently attracted much attention as a potential approach. In this paper, design strategy of computer-compatible 8-core trench-assisted MCF (TA-MCF) is presented to reduce the intercore crosstalk. Moreover, the influence of butt-coupled TA-MCF OI on coupling loss is also discussed. On the other hand, another alternative approach, the mode division multiplexing (MDM) is also showing promise and mode (de)multiplexer is one of the key devices in such a MDM system. Designs of mode splitters using asymmetric directional couplers for the fundamental quasi-TE (TM) mode with the higher order quasi-TE (TM) modes (de)multiplexer including the ( ), ( , ( , and ( ) modes are optimized by using a full-vectorial H-field finite element method.

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Section: Introductionmentioning

confidence: 99%

Section: Calculation Of Coupling Loss Due To Misalignmentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Design and optimization of photonic devices and optical fibers for space-division multiplexing

Rahman

Mishra

Pan

2018

Metro and Data Center Optical Networks and Short-Reach Links

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“…On the other hand, a junction analysis approach can also be used, as the proposed polarization rotator structure is composed of only two butt-coupled uniform waveguide sections with only two discrete interfaces between them. A powerful numerical approach, the Least Squares Boundary Residual (LSBR) method [22] can also be used, which rigorously satisfies the continuity of the tangential electric and magnetic fields at the junction interface in a least squares sense, and obtains the modal coefficients of the transmitted and reflected fully hybrid modes at the discontinuity interface. The LSBR method looks for a stationary solution to satisfy the continuity conditions by minimizing the error energy functional, J, as given by [22] …”

Section: Theorymentioning

confidence: 99%

Design of compact polarization rotator using simple silicon nanowires

Soudi¹,

Rahman²

2014

Appl. Opt.

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This is the accepted version of the paper.This version of the publication may differ from the final published version. In this paper, an ultra-compact design of polarization rotator based on silicon-on-insulator platform is presented, which contains two simple silicon nanowires but with unequal in width, which will be easier to fabricate. It is shown here that a low-loss, wide bandwidth and 52.8 m long compact Polarization rotator with polarization cross-talk -20 dB can be achieved. A full-vectorial finite element method and the least squares boundary residual method are used to study the effects of the fabrication tolerances and this design shows reasonably stable performances. Permanent

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“…We have also studied the vertical alignment tolerance between this fiber and the SSC. We have used an in house numerically efficient full vectorial algorithm for finite element method (FEM) to analyse the modal characteristics of the spot size converter (Rahman and Davies 1984), and the least squares boundary residual (LSBR) method to analyse power coupling at the junctions (Rahman and Davies 1988). Both the FEM and LSBR method used here represent a powerful and efficient tool to analyse structure such as ours (Wongcharoen et al 2001; Rajarajan et al 1996; Wongcharoen et al 1996.…”

Section: Introductionmentioning

confidence: 99%

Improved design for SOI based evanescently coupled multilayer spot-size converter

2017

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This is the accepted version of the paper.This version of the publication may differ from the final published version. Permanent repository link AbstractWe report an improved version of a spot size converter (SSC) consisting of a silicon nanowire evanescently coupled to a phase matched Poly Si multilayer structure. With wider transversal dimensions the multilayer structure expands the mode significantly thus increasing the coupling efficiency with the conventional single mode fiber. Detailed optimization process of a 17 layer based SSC is discussed and its coupling efficiency with a high NA fiber of radius 2 μm is obtained as 98% providing only 0.087 dB loss. Vertical alignment tolerance between the optimized SSC and a high NA fiber of radius 2 μm is also shown. This novel design does not consist of a taper and can be fabricated by using CMOS compatible process. It has a short device length and more relaxed alignment tolerances with the fiber. Full vectorial and computationally efficient finite element method and the least squares boundary residual method have been used for the analysis and optimization of the proposed structure.

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Analysis of optical waveguide discontinuities

Cited by 91 publications

References 24 publications

Design and optimization of photonic devices and optical fibers for space-division multiplexing

Design and optimization of photonic devices and optical fibers for space-division multiplexing

Design of compact polarization rotator using simple silicon nanowires

Improved design for SOI based evanescently coupled multilayer spot-size converter

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