Search results | TU Delft Repositories

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Spatial and Polarization Division Multiplexing Harnessing On-Chip Optical Beam Forming

González-Andrade, David (author), Le Roux, Xavier (author), Aubin, Guy (author), Amar, Farah (author), Nguyen, Thi Hao Nhi (author), Nuño Ruano, Paula (author), Dinh, Thi Thuy Duong (author), Oser, D.J.H. (author), Pérez-Galacho, Diego (author)

On-chip spatial and polarization multiplexing has emerged as a powerful strategy to boost the data transmission capacity of integrated optical transceivers. State-of-the-art multiplexers require accurate control of the relative phase or the spatial distribution among different guided optical modes, seriously compromising the optical...

journal article 2023

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Integrated silicon carbide sun position sensor system-on-chip for space applications

Romijn, J. (author)

doctoral thesis 2022

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Avalanche-mode Si light-emitting transistor for narrow-band emission near 760 nm

Dutta, S. (author), Hueting, Raymond J.E. (author), Verbiest, G.J. (author)

We report an avalanche-mode light-emitting transistor (AMLET) in silicon (Si), based on a lateral bipolar junction, which emits light near 760 nm optical wavelength with a record low bandwidth of 38 nm. The AMLET, designed in a CMOS-compatible silicon-on-insulator (SOI) photonics platform, is optically confined within a 0.21 ∼\μ m thick SOI...

journal article 2022

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Vertical SiC taper with a small angle fabricated by slope transfer method

Xin, Yu (author), Pandraud, G. (author), French, P.J. (author)

In this Letter, a slope transfer method to fabricate vertical waveguide couplers is proposed. This method utilises wet etched Si as a mask, and takes advantage of dry etching selectivity between Si and SiC, to successfully transfer the profile from the Si master into SiC. By adopting this method, a <2° slope is achieved. Such a taper can...

journal article 2019

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System robust optimization of ring resonator-based optical filters

Rehman, S.U. (author), Langelaar, Matthijs (author)

Fabrication variations can have a detrimental effect on the performance of optical filters based on ring resonators. However, by using robust optimization these effects can be minimized and device yield can be significantly improved. This paper presents an efficient robust optimization technique for designing manufacturable optical filters based...

journal article 2016

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Ultra-compact silicon photonic integrated interferometer for swept-source optical coherence tomography

Yurtsever, G. (author), Weiss, N. (author), Kalkman, J. (author), Van Leeuwen, T.G. (author), Baets, R. (author)

We demonstrate an ultra-compact silicon integrated photonic interferometer for swept-source optical coherence tomography (SS-OCT). The footprint of the integrated interferometer is only 0.75×5??mm2. The design consists of three 2×2 splitters, a 13 cm physical length (50.4 cm optical length) reference arm, and grating couplers. The photonic...

journal article 2014

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Silicon photonic micro-ring resonators to sense strain and ultrasound

Westerveld, W.J. (author)

We demonstrated that photonic micro-ring resonators can be used in micro-machined ultrasound microphones. This might cause a breakthrough in array transducers for ultrasonography; first because optical multiplexing allows array interrogation via one optical fiber and second because the silicon-on-insulator technology allows cost-effective...

doctoral thesis 2014

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A hybrid silicon-PDMS optofluidic platform for sensing applications

Testa, G. (author), Persichetti, G. (author), Sarro, P.M. (author), Bernini, R. (author)

A hybrid silicon-poly(dimethysiloxane) (PDMS) optofluidic platform for lab-on-a-chip applications is proposed. A liquid-core waveguide with a self-aligned solid-core waveguide and a microfluidic device are integrated with a multilayer approach, resulting in a three-dimensional device assembly. The optofluidic layer was fabricated with a hybrid...

journal article 2014

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Demonstration of Large Coupling-Induced Phase Delay in Silicon Directional Cross-Couplers

Westerveld, W.J. (author), Pozo, J. (author), Leinders, S.M. (author), Yousefi, M. (author), Urbach, H.P. (author)

We investigate directional couplers in silicon-on-insulator photonic technology. We theoretically and experimentally demonstrate a large coupling-induced phase delay that occurs when nearly all light is coupled from one waveguide to the other, i.e., when the coupler operates as a cross-coupler. We show that even a tiny asymmetry in the two...

journal article 2013

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Characterization of Integrated Optical Strain Sensors Based on Silicon Waveguides

Westerveld, W.J. (author), Leinders, S.M. (author), Muilwijk, P.M. (author), Pozo, J. (author)

Microscale strain gauges are widely used in micro electro-mechanical systems (MEMS) to measure strains such as those induced by force, acceleration, pressure or sound. We propose all-optical strain sensors based on micro-ring resonators to be integrated with MEMS. We characterized the strain-induced shift of the resonances of such devices....

journal article 2013

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Extension of Marcatili’s analytical approach for rectangular silicon optical waveguides

Westerveld, W.J. (author), Leinders, S.M. (author), Van Dongen, K.W.A. (author), Urbach, H.P. (author), Yousefi, M. (author)

Marcatili's famous approximate analytical description of light propagating through rectangular dielectric waveguides, published in 1969, gives accurate results for low-index-contrast waveguides. However, photonic integrated circuit technology has advanced to high-index-contrast (HIC) waveguides. In this paper, we improve Marcatili's model by...

journal article 2012

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Optimized 3D simulation method for modeling of out-of-plane radiation in silicon photonic integrated circuits

Westerveld, W.J. (author), Urbach, H.P. (author), Yousefi, M. (author)

We present an accurate and fast 3D simulation scheme for out-of-plane grating couplers, based on two dimensional rigorous (finite difference time domain) grating simulations, the effective index method (EIM), and the Rayleigh-Sommerfeld diffraction formula. In comparison with full 3D FDTD simulations, the rms difference in electric field is...

journal article 2011

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Integrated silicon optofluidic ring resonator

Testa, G. (author), Huang, Y. (author), Sarro, P.M. (author), Zeni, L. (author), Bernini, R. (author)

The feasibility of an integrated silicon optofluidic ring resonator is demonstrated. Liquid core antiresonant reflecting optical waveguides are used to realize a rectangular ring resonator with a multimode interference liquid core coupler between the ring and the bus waveguide. In this configuration the same waveguide used to confine the light...

journal article 2010

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Polarization-insensitive PECVD SiC waveguides for photonic sensing

Pandraud, G. (author), Pham, H.T.M. (author), Pakula, L.S. (author), Sarro, P.M. (author), French, P.J. (author)

Planar silicon carbide (SiC) waveguides are proposed for fabrication on a silicon substrate with a oxide isolation layer. Using post deposition annealing it is possible to achieve low Polarization-Dependent Loss (PDL) within optical SiC waveguides fabricated using a low temperature deposition technique. Those waveguides have been successfully...

conference paper 2005

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Dispersion resulting from wide passband shape in 50-GHz-spaced wavelength router

Gamet, J. (author), Pandraud, G. (author), Vonsovici, A.P. (author)

journal article 2004

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Compact integrated cross connects for wavelength-division multiplexing networks

Herben, C.G.P. (author)

doctoral thesis 2000

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InP-based polarisation independent wavelength demultiplexers

van Dam, C. (author)