High-Performance Multimode Interference Coupler in Silicon Waveguides With Subwavelength Structures

Ortega‐Moñux, Alejandro; Zavargo-Peche, L.; Maese-Novo, Alejandro; Molina-Fernández, Í.; Halir, Robert; Wangüemert‐Pérez, J. Gonzalo; Cheben, Pavel; Schmid, Jens H.

doi:10.1109/lpt.2011.2161866

Cited by 61 publications

(43 citation statements)

References 14 publications

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“…The overall result is a set of MATLAB functions implementing a 2D CAD tool that, up to now, has been successfully used in the analysis and design of several photonic devices [12,14,26]. It is worth mentioning that the reliability of FEXEN was demonstrated elsewhere [13, Figure 3], where the results of this tool were fairly similar to actual measurements on a real device.…”

Section: Fexenmentioning

confidence: 67%

“…We have analysed this simple device to show the SWG behaviour and to validate the presented tool. The second analysed device is a recently designed 90 • hybrid receiver implemented by a multi-modal interference (MMI) device that includes an SWG cladding to engineer the index contrast and achieve a better performance [14]. We use this device to show the capability of FEXEN to aid the design of novel devices comprising SWG structures.…”

Section: Resultsmentioning

confidence: 99%

“…It allows us to calculate the field distribution at the input once the incident field is known. Then, using (14)- (16), we can determine the field distribution in the whole device. Note that numerical problems are not expected as positive exponentials have been avoided and the S -matrix formulation has been used.…”

Section: Periodic Devices: the Floquet Modesmentioning

confidence: 99%

“…Note that more complicated figures of merit can be obtained. For example, the phase error and the common mode rejection ratio in a 90 • hybrid [14] or the coupling efficiency between a radiating grating and a fibre [12] were obtained using customized FEXEN scripts.…”

Section: Fexenmentioning

confidence: 99%

“…The main objective of this work is to show that the proposed tool is also a valuable resource for the design of state-of-the-art nanophotonic SWG devices, such as the multimode interference (MMI) coupler with subwavelength structures recently published in [14]. This paper is organized as follows.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Fourier Based Combined Techniques to Design Novel Sub-Wavelength Optical Integrated Devices

Zavargo-Peche¹,

Ortega‐Moñux²,

Wangüemert‐Pérez³

et al. 2012

PIER

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Abstract-We present a tool to aid the design of periodical structures, such as subwavelength grating (SWG) structures. It is based on the Fourier Eigenmode Expansion Method and includes the Floquet modes theory. Besides, the most interesting implemented functionalities to ease the design of photonic devices are detailed. The tool capabilities are shown using it to analyse and design three different SWG devices.

show abstract

Section: Fexenmentioning

confidence: 67%

Section: Resultsmentioning

confidence: 99%

Section: Periodic Devices: the Floquet Modesmentioning

confidence: 99%

Section: Fexenmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Fourier Based Combined Techniques to Design Novel Sub-Wavelength Optical Integrated Devices

Zavargo-Peche¹,

Ortega‐Moñux²,

Wangüemert‐Pérez³

et al. 2012

PIER

View full text Add to dashboard Cite

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An ultra‐compact multimode interference coupler with a subwavelength grating slot

Ortega‐Moñux

Alonso-Ramos

Maese-Novo

et al. 2013

Laser & Photonics Reviews

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Multimode interference couplers (MMIs) are fundamental building blocks in photonic integrated circuits. Here it is experimentally demonstrated, for the first time, a two-fold length reduction in an MMI coupler without any penalty on device performance. The design is based on a slotted 2 × 2 MMI fabricated on a commercial silicon-on-insulator (SOI) substrate. The slot is implemented with a subwavelength grating (SWG) comprising holes fully etched down to the oxide cladding, thereby allowing single etch step fabrication. The device has been designed using an in-house tool based on the Fourier Eigenmode Expansion Method. It has a footprint of only 3.5 μm x 23 μm and it exhibits a measured extinction ratio better than 15 dB within the full C-band (1530 nm-1570 nm). SWG engineered slots thus offer excellent perspectives for the practical realization of MMIs couplers with substantially reduced footprint yet with outstanding performance.

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Subwavelength grating Fourier‐transform interferometer array in silicon‐on‐insulator

Bock

Cheben

Velasco

et al. 2013

Laser & Photonics Reviews

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A planar waveguide Fourier‐transform spectrometer with densely arrayed Mach‐Zehnder interferometers is demonstrated. Subwavelength gratings are used to produce an optical path difference without waveguide bends. The fabricated device comprises of an array of 32 Mach‐Zehnder interferometers, which produce a spatial interferogram without any moving parts, yielding a spectral resolution of 50 pm and a free‐spectral range of 0.78 nm. As a result of similar propagation losses in subwavelength grating waveguides and conventional strip waveguides, loss imbalance is minimized and high interferometic extinction ratio of −25 to −30 dB is obtained. Furthermore, phase and amplitude errors arising from normal fabrication variation are compensated by the spectral retrieval process using calibration measurements.

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High-Performance Multimode Interference Coupler in Silicon Waveguides With Subwavelength Structures

Cited by 61 publications

References 14 publications

Fourier Based Combined Techniques to Design Novel Sub-Wavelength Optical Integrated Devices

Fourier Based Combined Techniques to Design Novel Sub-Wavelength Optical Integrated Devices

An ultra‐compact multimode interference coupler with a subwavelength grating slot

Subwavelength grating Fourier‐transform interferometer array in silicon‐on‐insulator

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