Pantelis Velanas

Cyprus Research and Innovation Center (Cyprus)

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Trends

Author Order

Document Type

Co-Authors

Dimitris Syvridis

National and Kapodistrian University of Athens

Adonis Bogris

University of West Attica

Katerina Margariti

Cyprus Research and Innovation Center (Cyprus)

John Soldatos

INTRASOFT International (Luxembourg)

Christos Riziotis

National Hellenic Research Foundation

A. Teixeira

Instituto de Telecomunicações

Apostolos Argyris

Active Fiber Systems (Germany)

G. Kakarantzas

National Hellenic Research Foundation

G. Tosi Beleffi

Ministry of Economic Development

Philippe Chanclou

Orange (France)

Cooperative Institutions

National and Kapodistrian University of Athens

Universitat Politècnica de Catalunya

National Hellenic Research Foundation

National Technical University of Athens

Aristotle University of Thessaloniki

Athens Information Technology

Cyprus Research and Innovation Center (Cyprus)

University of Patras

Universidad de Salamanca

Catholic University of Ávila

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Field

METICOS Deliverable D2.2 Data Management Plan

Zenodo (CERN European Organization for Nuclear Research) (2021)

Pantelis Velanas

Deliverable

10.5281/zenodo.8178566

Cite

Citations (0)

High-Speed All-Optical First- and Second-Order Differentiators Based on Cross-Phase Modulation in Fibers

Journal of Lightwave Technology (2008)

Pantelis Velanas Adonis Bogris Apostolos Argyris Dimitris Syvridis

An ultrafast all-optical differentiator generating the first- and the second-order temporal derivative of the intensity of optical signals is presented in this paper. Differentiation is obtained via an optical fiber that plays the role of an optical phase modulator, an optical bandpass filter and a photodetector. The operation of the proposed device is theoretically studied in order to highlight significant parameters that affect the performance of the differentiator, namely the filter transfer function, the power of the propagating waves and the fiber characteristics (length and nonlinear coefficient). The comparison between the numerically calculated derivatives and the theoretically expected ones is performed by estimating the correlation coefficient between them. According to the numerical analysis, high correlation coefficients can be achieved in certain operating regimes. The same device can be utilized in order to produce ultrawideband (UWB) impulse signals. Electrical monocycle or doublet pulses can be obtained at the output of the photodetector (PD) using the proper tunable optical filter. Experimental verification of the theoretically predicted and numerically calculated results is finally presented for high bit-rate signals.

Differentiator

Impulse response

Optical transfer function

Optical power

10.1109/jlt.2008.923930

Cite

Citations (80)

Passive optical network for long-reach scalable and resilient access

International Conference on Telecommunications (2009)

Josep Prat José A. Lázaro Philippe Chanclou Risto Soila Pantelis Velanas

A future access network and its main innovations are presented. The Scalable Advanced Ring-based passive Dense Access Network Architecture” (Sardana) is able to provide one order-of-magnitude increase in performances with enhanced functionality. Key enabling innovations, like the hybrid ring/tree WDM/TDM-PON architecture, the enhanced MAC, the resilient remotely pumped remote node and the reflective ONU are described, as fundamental building blocks of the future network.

Access network

10G-PON

Source

Cite

Citations (6)

Polarization-insensitive 2R-regenerator based on two-pump fiber optical parametric amplifier

Pantelis Velanas Adonis Bogris Dimitris Syvridis

An all optical parametric 2R-regenerator is numerically investigated in terms of its polarization insensitivity. The proposed device is based on the use of a fiber optical parametric amplifier with two pumps at orthogonal polarization states.

Optical parametric amplifier

Optical Pumping

10.1109/leoswt.2009.4771724

Cite

Citations (3)

Flat mid-infrared supercontinuum generation in tapered fiber with thin coating of highly nonlinear glass

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (2015)

Pantelis Velanas G. Kakarantzas Christos Riziotis

The enhancement of nonlinear characteristics of a tapered fiber, which is covered with a thin layer of highly nonlinear glass, is theoretically studied in this work. The generation of a flat, octave spanning supercontinuum extending from 750 nm to 2750nm (at -20dB) has been numerically presented by considering the coupling of the proposed structure with a typical Yb laser able to emit ultrashort pulses. The physical processes behind the SC formation are described in the anomalous dispersion regions.

Supercontinuum

10.1117/12.2080090

Cite

Citations (2)

A novel transmitter based on orthogonal modulation schemes for future passive optical networks

Pantelis Velanas Y. Androulakakis Adonis Bogris Dimitris Syvridis

A low-cost technique for the upgrade of access passive optical networks based on multitone frequency shift keying (FSK) modulation format combined with conventional intensity modulation is proposed and numerically evaluated.

Frequency-shift keying

Modulation (music)

Upgrade

10.1109/ofc.2008.4528030

Cite

Citations (0)

Hybrid silica nanowires with a highly nonlinear glass think coating

G. Antonopoulos Pantelis Velanas Amalia Psomaki-Karra Christos Riziotis G. Kakarantzas

We report on the fabrication of hybrid photonic nanowires consisting of silica tapered fibers covered with a thin layer (< 100 nm) of a sol-gel derived highly nonlinear glass (HNG). These hybrid nanowires exhibit finely tunable waveguide properties: The deposition of a single layer of high index glass around the silica taper in sound to be sufficient for obtaining zero-dispersion operating wavelenghts at any point throughout the visible to mid-infrared range, while both positions and values of id

Waveguide

Silica glass

10.1109/scno.2015.7324005

Cite

Citations (0)

Assessment of fiber optic sensors for aging monitoring of industrial liquid coolants

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (2015)

Christos Riziotis Alexandros El Sachat Christos Markos Pantelis Velanas Anastasia Meristoudi

Lately the demand for in situ and real time monitoring of industrial assets and processes has been dramatically increased. Although numerous sensing techniques have been proposed, only a small fraction can operate efficiently under harsh industrial environments. In this work the operational properties of a proposed photonic based chemical sensing scheme, capable to monitor the ageing process and the quality characteristics of coolants and lubricants in industrial heavy machinery for metal finishing processes is presented. The full spectroscopic characterization of different coolant liquids revealed that the ageing process is connected closely to the acidity/ pH value of coolants, despite the fact that the ageing process is quite complicated, affected by a number of environmental parameters such as the temperature, humidity and development of hazardous biological content as for example fungi. Efficient and low cost optical fiber sensors based on pH sensitive thin overlayers, are proposed and employed for the ageing monitoring. Active sol-gel based materials produced with various pH indicators like cresol red, bromophenol blue and chorophenol red in tetraethylorthosilicate (TEOS), were used for the production of those thin film sensitive layers deposited on polymer's and silica's large core and highly multimoded optical fibers. The optical characteristics, sensing performance and environmental robustness of those optical sensors are presented, extracting useful conclusions towards their use in industrial applications.

Bromophenol blue

Robustness

Characterization

10.1117/12.2079988

Cite

Citations (6)

METICOS Deliverable D1.6 EPQ-Requirement No.9

Zenodo (CERN European Organization for Nuclear Research) (2022)

Pantelis Velanas

Deliverable

10.5281/zenodo.6684124

Cite