Luc Thévenaz

We here propose a novel technique for realizing the multiplication of the pulse repetition rate with a flexibly tunable multiplication factor, based on dynamic Brillouin grating (DBG) reflectors implemented in highly birefringent fibers. ...

Optical Society of America2011

All-optical calculus based on dynamic Brillouin grating reflectors in optical fibers

Luc Thévenaz, Sang Hoon Chin, Andrea Trita

We experimentally demonstrate that all-optical signal calculus can be realized based on dynamic Brillouin gratings in optical fibers. Temporal integration and first-order differentiation were performed for optical pulse with various waveforms. ...

Optical Society of America2011

All-Optical Self-Synchronizing Scheme for Contention Resolution in Asynchronous Optical Packet Switched Networks Using Continuously Tunable Optical Delay Line

Continuously tunable, optically-controlled variable delay line based on dynamic Brillouin grating is exploited for automated synchronization of switching signals in a network node, enabling asynchronous contention resolution with packet priorization. ...

Optical Society of America2011

Distributed Brillouin sensing with sub-meter spatial resolution: modeling and processing

Luc Thévenaz, Stella Foaleng Mafang

A general analytic solution for Brillouin distributed sensing in optical fibers with sub-meter spatial resolution is obtained by solving the acoustical-optical coupled wave equations by a perturbation method. The Brillouin interaction of a triad of square ...

Optical Society of America2011

Hot spot detection over 100 km with 2 meter resolution in a Raman-assisted Brillouin distributed sensor

We have developed a long-range Brillouin distributed sensor featuring 100 km measuring distance with 2 meter resolution. To our knowledge, this is the first time that a high-resolution setup reaches the barrier of 100 km measurement range. The key improvem ...

2011

Ultra-long range distributed fibre sensing using virtually transparent propagation

We address the concept of virtual transparency in optical fibres and its application to dynamic range extension in distributed sensors. A sensor featuring 100 km measurement range with 2 meter resolution is experimentally demonstrated. ...

Optical Society of America2011

Optical pulse differentiation based on a resonant slow & fast light system

We experimentally demonstrate that temporal differentiation of optical pulses can be realized in a slow & fast light system based on a resonance. The waveform of a 13 ns Gaussian pulse was experimentally first-order differentiated. ...

Optical Society of America2011

Dual-pump push-pull polarization control using stimulated Brillouin scattering

Stimulated Brillouin scattering (SBS) amplification of probe signals is highly polarization dependent. Maximum and minimum gain values are associated with a pair of orthogonal states of polarization (SOP), which are related to the pump SOP. Since the maxim ...

Optical Society of America2011

Polarization pulling based on stimulated Brillouin scattering in a dual-pump configuration

Stimulated Brillouin scattering (SBS) amplification of probe signals is highly polarization dependent. Maximum and minimum gain values are associated with a pair of orthogonal states of polarization (SOP) at the fiber output. Since the maximum gain is much ...

SPIE2011

Raman-assisted BOTDA sensors

Luc Thévenaz, Stella Foaleng Mafang

We review some recent results on the application of distributed Raman amplification schemes, including ultralong lasers, to the extension of the operating range and contrast in Brillouin optical time domain analysis (BOTDA) distributed sensing systems. ...

IEEE2011

Impact of Raman scattering and modulation instability on the performances of Brillouin sensors

The impact of Raman scattering and modulation instability is studied in Brillouin time-domain analysis systems. It turns out to be very detrimental for long-range sensing as a result of the extended interaction length combined to the high pump peak pulse p ...

SPIE2011

Structural slow light can enhance Beer-Lambert absorption

Luc Thévenaz, Sang Hoon Chin, Isabelle Dicaire

We experimentally demonstrate that structural slow light can enhance Beer-Lambert absorption. A 4-fold reduction of the group velocity induced by mere cavity effects has caused an increase of molecular absorption by 130%. ...

Optical Society of America2011

Photonic crystal fiber mapping using Brillouin echoes distributed sensing

Luc Thévenaz, Stella Foaleng Mafang

In this paper we investigate the effect of microstructure irregularities and applied strain on backward Brillouin scattering by comparing two photonic crystal fibers drawn with different parameters in order to minimize diameter and microstructure fluctuati ...

Optical Society of America2010

Measurement with 2m resolution using a Raman-assisted BOTDA sensor featuring 75km dynamic range

We have used distributed Raman amplification to extend the measurement distance of a Brillouin Optical Time-Domain Analysis (BOTDA) sensor. We successfully demonstrate a dynamic range of 75 km with 2 meter spatial resolution. ...

The International Society for Optical Engineering2010

Distributed Brillouin Fiber Sensor Assisted by First-Order Raman Amplification

Distributed optical fiber Brillouin sensors provide innovative solutions for the monitoring of temperature and strain in large structures. The effective range of these sensors is typically of the order of 20–30 km, which limits their use in certain ...

IEEE Institute of Electrical and Electronics Engineers2010

Recent advancement of slow light in microwave photonics applications

Luc Thévenaz, Marcelo Alfonso Soto Hernandez

A complete realization of an optically tunable true time delay, generated through the combination of a photonic RF phase shifter and a Brillouin slow light element is presented. Illustration through a dynamic microwave photonic filter is demonstrated. ...

IEEE2010

Long-range Brillouin optical time-domain analysis sensor employing pulse coding techniques

In this paper we describe and implement a long-range Brillouin optical time-domain analysis (BOTDA) sensor, for both temperature and strain measurements, using optical pulse coding techniques. A theoretical analysis of Simplex coding applied to BOTDA syste ...

2010

Simple source for broadband Brillouin slow light in optical fibers

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

Spontaneously broadened emission from a distributed feedback laser diode perated just above threshold is used as a pump source in Brillouin slow light systems. The pump spectrum could this way be extended to several GHz. ...

Ieice-Inst Electronics Information & Communication Engineers, Kikai-Shinko-Kaikan Bldg 103, 5-8, Shibakoen 3 Chome, Minato-Ku, Tokyo, 105-0011, Japan2010

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

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

True Time Delay on tunable Microwave Photonic Filter based on Stimulated Brillouin Scattering in fibers