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Proceedings Paper

Spectral and temporal phase measurement by optical frequency-domain reflectometry
Author(s): Bruno Robillart; Cosimo Calò; Abdoulaye Fall; François Lamare; Yaneck Gottesman; Badr-Eddine Benkelfat
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Paper Abstract

The capability of measuring the spectral and temporal phase of an optical signal is of fundamental importance for the advanced characterization of photonic and optoelectronic components, biochemical sensors, structural monitoring sensors and distributed sensor networks. To address this problem, several techniques have been developed (frequency-resolved optical gating (FROG), spectral phase interferometry for direct electric-field reconstruction (SPIDER), stepped-heterodyne technique, laser Doppler vibrometry (LDV) and Doppler optical coherence tomography (OCT)). However, such techniques often lack of versatility for the mentioned applications. Swept-wavelength interferometric techniques and, among these, optical frequency-domain reflectometry (OFDR) are flexible and highly sensitive tools for complete characterization of amplitude and phase of target devices. In this work, we investigate the spectral and temporal phase measurement capabilities of OFDR. Precise characterization of spectral phase information is demonstrated by retrieving the phase response of a commercial optical filter, the Finisar Waveshaper 1000 S/X, programmable in attenuation and phase over C+L band (1530– 1625 nm). The presented results show accurate retrieval of group delay dispersion (GDD) and discrete phase shift as well as filter attenuation profile. Although some intrinsic accuracy limitations of OFDR phase measurements may be encountered (and herein specified), we show that information encoded in OFDR reflectogram data is very rich when adequately exploited. In addition to previously published results, we demonstrate the high sensitivity of the technique to Doppler effects. From practical point of view, such sensitivity can be beneficially exploited for the characterisation of dynamical aspects of samples under test. Unlike LDV, OFDR allows the simultaneous retrieval of the temporal position of several localised reflecting target along the beam path. All these aspects make OFDR a highly promising candidate for the study of both static and dynamic aspects of complex photonic components or to probe a parallel sensor network, as needed for future applications.

Paper Details

Date Published: 7 March 2014
PDF: 11 pages
Proc. SPIE 8961, Fiber Lasers XI: Technology, Systems, and Applications, 896134 (7 March 2014); doi: 10.1117/12.2039600
Show Author Affiliations
Bruno Robillart, Institute Mines-Télécom and Télécom SudParis, CNRS (France)
Cosimo Calò, Lab. for Photonics and Nanostructures, CNRS (France)
Abdoulaye Fall, Institute Mines-Télécom and Télécom SudParis, CNRS (France)
François Lamare, Institute Mines-Télécom and Télécom SudParis, CNRS (France)
Yaneck Gottesman, Institute Mines-Télécom and Télécom SudParis, CNRS (France)
Badr-Eddine Benkelfat, Institute Mines-Télécom and Télécom SudParis, CNRS (France)

Published in SPIE Proceedings Vol. 8961:
Fiber Lasers XI: Technology, Systems, and Applications
Siddharth Ramachandran, Editor(s)

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