Silicon photonics dual-coupler nested coupled cavities

Shalaby, Rabab A.; Selim, Mahmoud A.; Adib, George A.; Sabry, Yasser M.; Gad, Michael; Khalil, Diaa

doi:10.1117/12.2509661

Cited by 8 publications

(5 citation statements)

References 12 publications

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“…A buried oxide (BOX) layer of SiO 2 of thickness t box = 2µm, separates the silicon waveguide from the silicon substrate. This design assures compatibility with the low-cost complementary-metal-oxidesemiconductor (CMOS) fabrication technology such as the multi-project-wafer (MPW) offered by IMEC [19,20,23,39].…”

Section: The Modulator Designmentioning

confidence: 99%

“…This allows a small bending radius, enabling high density of integration [17]. With so many features, a magnitude of research effort was poured into this direction and resulted in many effective designs of integrated components such as ring resonators [18][19][20][21], Mach-Zender interferometers (MZI) [22], interleavers [23], multi-mode interferometers (MMIs) [24], sensors [25][26][27], gyroscopes [28], Bragg-gratings [29], and fiber-grating couplers [30].…”

Section: Introductionmentioning

confidence: 99%

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Design of compact, high-speed and low-loss silicon-on-silica electro-optic modulators

Mahrous

Azmy

Afifi

et al. 2020

Semicond. Sci. Technol.

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Throughout a careful step-by-step study, two simple designs of electro-optic modulators are proposed. The study shows the effect of dimensions and doping concentration on the performance parameters such as the modulation bandwidth, the size, the insertion loss and the extinction ratio. One design shows a modulation bandwidth of 54.5 GHz with a relatively short phase shifter length of 2.5 mm, a low optical insertion loss of 1.1 dB and a very high extinction ratio of 30 dB. The other one shows a bandwidth of 12.8 GHz, a phase shifter length of 9 mm, an optical insertion loss of 3.3 dB and an extinction ratio of 3 dB. It is shown that these two designs can fit to the requirements of the 5G telecommunications networks at different points which require different speeds of operation. The designs feature the complementary-metaloxide-semiconductor technology advantages of ease and low-cost of fabrication.

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Section: The Modulator Designmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Design of compact, high-speed and low-loss silicon-on-silica electro-optic modulators

Mahrous

Azmy

Afifi

et al. 2020

Semicond. Sci. Technol.

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“…What has motivated these efforts is their ability to confine the light to a certain volume by virtue of a multilayer structure or total internal reflection. Moreover, optical cavities enable myriad applications such as temperature and pressure [1,2], gas sensors [3,4], refractive index sensors [5,6], spectroscopy [7][8][9], and on-chip filters [10], to mention a few. Additionally, multilayer configurations are exploited in liquid crystal display, augmented reality, and virtual reality [11,12].…”

Section: Introductionmentioning

confidence: 99%

Modeling and characterization of deeply etched multilayer resonators under partial coherent excitation via multimode optical fibers

A Selim,

Sabry,

Marty

et al. 2024

J. Opt.

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Recently, there has been a resurgence of interest in multimode optical fibers illuminated by a white light source. Largely, in anticipation of many integrated applications in the biomedical domain and spectral sensing benefiting from the broad spectral range and high numerical aperture. Along these lines, the output light from these fibers can be captured by the physics of partially coherent sources. While the Gaussian Schell model has provided a framework for studying partial coherence, to our knowledge, its impact on microstructures remains unexplored. As the sheer complexity arising from the interplay between partial coherence and microstructures transfer function has posed fundamental challenges in deciphering their response. In this work, we introduce a comprehensive numerical model paired with experimental validation to assess the performance of multilayer optical resonators, which are meticulously crafted through high aspect ratio silicon etching under the influence of a partially coherent optical source. The model studies the effects of optical fiber numerical aperture, Bragg mirror order, cavity length, and surface roughness of the microstructures on the output of the resonator. The results show that the response under standard multimode fiber (partial coherent source) has lower insertion loss, more asymmetry versus wavelength, and larger full width at half maximum (FWHM) than the standard single mode fiber (full coherent source). A silicon-on-insulator chip is fabricated using 130-µm deep etching of silicon for Bragg mirrors with 2.25, 3, and 3.25 µm silicon layer widths and a different number of layers. The structures are characterized using a multimode fiber of 62.5-µm core diameter illuminated by an infrared white light source. The theoretical results have been compared with the experimental results and a good agreement has been obtained.

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“…Complicated circuits grabbed more attention at a later stage. This includes optical crossing structures [16], spot size converters [17], vertical couplers [18], reflectors [19], polarization splitters [20], polarization rotators [21], filters [22][23][24], logic gates [25], modulators [26][27][28][29][30][31][32][33][34], sensors [35][36][37][38][39][40][41][42], light detection and ranging (LiDAR) devices [43], and gyroscopes [44]. A new trend in this field is enabling the silicon-photonics platform in the near-infrared (NIR) and the mid-infrared (MIR) ranges, despite material absorption losses [45][46][47].…”

Section: Introductionmentioning

confidence: 99%

A Multi-Objective Genetic Algorithm Approach for Silicon Photonics Design

Mahrous,

Fedawy,

Abboud

et al. 2024

Photonics

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A multi-objective genetic algorithm approach is formulated to optimize the design of silicon-photonics complex circuits with contradicting performance metrics and no closed-form expression for the circuit performance. A case study is the interleaver/deinterleaver circuit which mixes/separates optical signals into/from different physical channels while preserving the wavelength-division-multiplexing specifications. These specifications are given as channel spacing of 50 GHz, channel 3-dB bandwidth of at least 20 GHz, channel free spectral range of 100 GHz, crosstalk of −23 dB or less, and signal dispersion less than 30 ps/nm. The essence of the proposed approach lies in the formulation of the fitness functions and the selection criteria to optimize the values of the three coupling coefficients, which govern the circuit performance, in order to accommodate the contradicting performance metrics of the circuit. The proposed approach achieves the optimal design in an incomparably short period of time when contrasted with the previous tedious design method based on employing Z-transform and visual inspection of the transmission poles and zeros.

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Silicon photonics dual-coupler nested coupled cavities

Cited by 8 publications

References 12 publications

Design of compact, high-speed and low-loss silicon-on-silica electro-optic modulators

Design of compact, high-speed and low-loss silicon-on-silica electro-optic modulators

Modeling and characterization of deeply etched multilayer resonators under partial coherent excitation via multimode optical fibers

A Multi-Objective Genetic Algorithm Approach for Silicon Photonics Design

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