Publications by Kwang-Yong Song

High Spatial and Spectral Resolution Long-Range Sensing Using Brillouin Echoes

Luc Thévenaz, Sang Hoon Chin, Kwang-Yong Song, Nikolay Primerov, Stella Foaleng Mafang

While classical configurations have a practical spatial resolution of 1 meter, novel approaches have been demonstrated that can overcome this limit to offer spatial resolutions in the centimetre range, while preserving full measurand accuracy. ...

Optical Society of America2011

Recent progress towards centimetric spatial resolution in distributed fibre sensing

Luc Thévenaz, Sang Hoon Chin, Kwang-Yong Song, Nikolay Primerov, Stella Foaleng Mafang

Optical fibre sensors based on stimulated Brillouin scattering have now clearly demonstrated their excellent capability for long-range distributed strain and temperature measurements. The fibre is used as sensing element and a value for temperature and/or ...

The International Society for Optical Engineering2010

Time-Domain Distributed Fiber Sensor With 1 cm Spatial Resolution Based on Brillouin Dynamic Grating

Luc Thévenaz, Sang Hoon Chin, Kwang-Yong Song, Nikolay Primerov

We demonstrate an optical time-domain distributed fiber sensor showing the highest spatial resolution ever reported based on Brillouin dynamic grating in a polarization-maintaining fiber. In our scheme, the acoustic gratings containing the information on t ...

IEEE Institute of Electrical and Electronics Engineers2010

True Time Reversal through Dynamic Brillouin Gratings in Polarization Maintaining Fibers

Luc Thévenaz, Sang Hoon Chin, Kwang-Yong Song, Nikolay Primerov

A novel technique to realize true time reversal of an optical signal, using dynamic Brillouin gratings in high-birefringence fibers, is proposed. A data sequence of optical pulses with 2-ns duration was efficiently time-reversed. A numerical simulation of ...

2010

True Time Reversal via Dynamic Brillouin Gratings in Polarization Maintaining Fibers

Luc Thévenaz, Sang Hoon Chin, Kwang-Yong Song, Nikolay Primerov

A novel technique to realize true time reversal of an optical signal, using dynamic Brillouin gratings in high-birefringence fibers, is proposed. A data sequence of optical pulses with 2-ns duration was efficiently time-reversed. ...

Optical Society of America2010

Ultra Wide Range Tunable Delay Line Using Dynamic Grating Reflectors in Optical Fibers

Luc Thévenaz, Sang Hoon Chin, Kwang-Yong Song, Nikolay Primerov

We experimentally demonstrate a novel technique to realize a tunable delay line based on dynamic Brillouin gratings in a high birefringence fiber. A 8ns pulse signal is continuously delayed up to 184ns with minor distortion. ...

Optical Society of America2010

Advanced Brillouin-based distributed optical fibre sensors with sub-meter scale spatial resolution

Luc Thévenaz, Sang Hoon Chin, Kwang-Yong Song, Nikolay Primerov, Stella Foaleng Mafang

Classical configurations of Brillouin distributed optical fibre sensors show a spatial resolution limited by the phonon lifetime to 1 meter. Novel approaches can substantially overcome this limit through the prior activation of the acoustic wave. ...

IEEE2010

Time-domain distributed sensor with 1 cm spatial resolution based on Brillouin dynamic gratings

Luc Thévenaz, Sang Hoon Chin, Kwang-Yong Song, Nikolay Primerov

We propose and experimentally demonstrate the highest-resolution BOTDA system ever reported using Brillouin dynamic grating in a polarization-maintaining fiber (PMF). Acoustic waves containing the information of local Brillouin frequency are generated by a ...

SPIE2009

Flexible Slow and Fast Light in Optical Fibers

Luc Thévenaz, Sang Hoon Chin, Kwang-Yong Song

A method to achieve an extremely wide and flexible control of the group velocity in an optical fiber using stimulated Brillouin scattering is presented. Group velocities below 71,000 km/s on one hand, well exceeding the speed of light in vacuum on the othe ...

IEEE2006

La lumière lente et rapide: une future pièce maîtresse pour la photonique

Luc Thévenaz, Sang Hoon Chin, Kwang-Yong Song

Nous présentons une technique permettant de réaliser un contrôle extensif et très souple de la vitesse de groupe de signaux se propageant dans une fibre optique. Ce contrôle, directement piloté par une source lumineuse, est effectué par le truchement de ga ...

2006