Publications

2020 Publications

16. Fabrication and Performance of Passive Linear Electric Field Frequency Discriminator Filter for 5G Phase-Modulated Microwave Photonic Links

2020 International Topical Meeting on Microwave Photonics (MWP). Matsue, Japan (November 2020), pp. 29-32. DOI: 10.23919/MWP48676.2020.9314558

Author: Georgios Charalambous, Nicholas Madamopoulos, Benjamin Dingel, Stavros Iezekiel

Abstract: We present the circuit design, fabrication in silicon-on-insulator (SOI) platform, and measurement of a linearized electric field discriminator (FD) filter, called Sin-Sin2. This low complexity FD is intended for advanced 5G phase/frequency-modulated direct-detection (PM/FM-DD) links.

15. University campus 5G testbed and use case deployments in the Philippines

Proceedings Volume 11307, Broadband Access Communication Technologies XIV; 1130704 (2020).
DOI: https://doi.org/10.1117/12.2549903

Author: John Paul Mamaradlo, Neil Angelo Mercado, Nathaniel Libatique, Gregory Tangonan, Ron Jowell Solis, Virginia Rodriguez, Benjamin Dingel, Cesar Pineda, Czar Lopez

Abstract: We will report on one of the first demonstrations of mobile cloud use cases in the 5G paradigm for smart transport systems in a university campus setting in the Philippines. Globally, 2019 has been identified as a watershed year for the demonstration of business cases for 5G, and this year many network operators are exploring how quickly and effectively traction and engagement can be gained from existing business and partner relationships. The Ateneo de Manila University is a unique academic partner as its Loyola Heights campus houses an eclectic collection of research institutions, grade school to graduate school units and a creative hub for the arts ...

14. Low-cost, low-complexity electronic analogue of the phenomenon known as Relativistic Aberration of Light using OP-AMP-based All-Pass Filter circuits

Proceedings of the 38th Samahang Pisika ng Pilipinas International Physics Conference and Annual Meeting (Albay, Philippines: October 19-23, 2020).

Author: Krystel Iris de Castro, Benjamin Dingel, Nathaniel Libatique, Jan Llenzl Dagohoy, Carlos Oppus

Abstract: We report, for the first time to the best of our knowledge, a surprisingly simple, low-cost and low-complexity electronic analogue of the phenomenon known as Relativistic Aberration of Light (RAL) in Special Relativity (SR) by using an operational amplifier (OP-AMP)-based All-Pass Filter (APF) circuit. We show by experimental results as well as simulation results, using both analytical model and commercial software, that the phase response of the APF circuit describes the behavior of RAL. The full characteristics of the RAL are presented. This work opens doors for other SR phenomena to be investigated with electronic analogue circuits.

13. New analytical soliton solutions to Korteweg-de Vries (KdV) equation using a family of hyperbolic tangent functions

Proceedings of the 38th Samahang Pisika ng Pilipinas International Physics Conference and Annual Meeting (Albay, Philippines: October 19-23, 2020).

Author: Aria Buenaventura, Benjamin Dingel, Clyde Calgo

Abstract: We report a new and richer ansatz for the standard KdV equation. It is a variant of the hyperbolic tangent function and is governed by a new parameter p (0 < p ≤ 1). It leads to three important consequences: (i) when p = 1, our new ansatz reduces to the familiar tanh(𝜃) function that is used to construct the ideal sech-shaped soliton solution in the KdV equation, (ii) when p = 0, it shrinks to a scaled tanh(𝜃/2) function that has interesting features, and (iii) when p is between 0 and 1, it generates a family of new soliton solutions that can account for physical differences from an ideal sech-shaped soliton ...

12. Impact of non-ideal factors on the performance of the Michelson-Gires-Tournois Interferometer (MGTI)-based analogue of the Thomas angle in special relativity

Proceedings of the 38th Samahang Pisika ng Pilipinas International Physics Conference and Annual Meeting (Albay, Philippines: October 19-23, 2020).

Author: Clyde Calgo, Benjamin Dingel, Justin Lim

Abstract: We investigate the combined impact of two non-ideal factors [(i) Gires-Tournois resonator (GTR) imperfection and (ii) interferometric error] on the performance of a Michelson-Gires-Tournois interferometer (MGTI)-based analogue of the Thomas angle in Special Relativity. We aim to minimize the impacts of these factors to get a <5% overall error in obtaining the Thomas angle from the MGTI. We report that (i) the GTR's imperfect back mirror coating must have a reflectance r0 ≥ 0.9534 to get a 1% maximum deviation of the mimicked Thomas angle and (ii) the path-length difference interferometric error of the MGTI must be ≤ λ/30 to have a ≥ 95% effective parameter input range.

11. Linearized microwave photonics devices for microwave fiber links-based 5G application

Proceedings of the 38th Samahang Pisika ng Pilipinas International Physics Conference and Annual Meeting (Albay, Philippines: October 19-23, 2020).

Author: Benjamin Dingel

Abstract: The rapid evolution of microwave fiber links-based analog and digital communication systems, and the need for higher speed and higher bandwidth to support the Wireless 5G applications have increased the need for linear optical, optoelectronic and photonic components. In this paper, we review the linearization techniques and requirements for photonic components as they pertain to their utilization in digital and analog photonic links and networks. In particular, we present our work on Linear Electric Field Optical Modulator for digital coherent optical communication applications, and a Linear Optical Frequency Discriminator for phase-modulated direct-detection applications ...

10. Special relativity-on-a-photonic-chip: Applying circuits’ analysis to characterize Einstein Velocity Addition Law

Optik, Vol. 207, 163788, (2020). DOI: https://doi.org/10.1016/j.ijleo.2019.163788

Author: Benjamin Dingel

Abstract: We demonstrate, for the first time to best of our knowledge, the usefulness of the analytical toolbox developed from a disparate field like Photonic Integrated Circuits (PICs) and now applied in the study of the Einstein Velocity Addition (EVA) in Special Relativity (SR) ...

9. Thin Film-based Gires-Tournois Resonator (GTR) as quasi-optical analogue of the Thomas rotation angle effect in special relativity

Optics Communications, Vol. 454, 124510, (2020).
DOI: 10.1016/j.optcom.2019.124510

Authors: Benjamin Dingel, Aria Buenaventura, Annelle Chua, Nathaniel Libatique

Abstract: We present an unconventional approach to generate an optical analogue of the Thomas rotation angle found in Special Relativity (SR) by using a thin-film–based Gires–TournoisResonator (GTR). At first glance, the phase response of the GTR seems to fail as an optical analogue for the Thomas rotation angle in the phase domain but we demonstrate that an analogue can be successfully constructed in the intensity domain by combining the GTR with a Michelson interferometer (MI), thus forming an interferometer known as the Michelson–Gires–Tournois Interferometer (MGTI) ...