Publication

Mitigating modulation instability in Brillouin distributed fibre sensors

Luc Thévenaz, Mohammad Mehdi Alem Karladani, Marcelo Alfonso Soto Hernandez, Wei Chen
2013
Conference Papers

Résumé

A thorough study of the generation of modulation instability (MI) in distributed Brillouin fibre sensors is presented. ASE noise co-propagating with the pump pulses within the MI gain spectrum has been identified to be an important factor seeding modulation instability and reducing its power threshold. The paper describes how optical narrowband filtering reduces the pump depletion resulting from MI, allowing pump pulses to propagate through longer distances in standard optical single-mode fibres.

Source officielle

https://infoscience.epfl.ch/entities/publication/abfaa7f3-85f1-4582-9c71-fff0bd95e6a7

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Luc Thévenaz, Mohammad Mehdi Alem Karladani, Marcelo Alfonso Soto Hernandez, Wei Chen
2013
Conference Papers

Résumé

Source officielle

https://infoscience.epfl.ch/entities/publication/abfaa7f3-85f1-4582-9c71-fff0bd95e6a7

À propos de ce résultat

Concepts associés (15)

Laser pumping

Laser pumping is the act of energy transfer from an external source into the gain medium of a laser. The energy is absorbed in the medium, producing excited states in its atoms. When the number of particles in one excited state exceeds the number of particles in the ground state or a less-excited state, population inversion is achieved. In this condition, the mechanism of stimulated emission can take place and the medium can act as a laser or an optical amplifier. The pump power must be higher than the lasing threshold of the laser.

Automodulation de phase

L'automodulation de phase (self-phase modulation, souvent abrégé en SPM en anglais) est un effet optique non linéaire d'interaction lumière-matière (gaz, solide, liquide). Une impulsion ultra-courte, lorsqu'elle voyage dans un milieu matériel, induit une variation de l'indice de réfraction de ce milieu par effet Kerr. Cette variation induit à son tour un décalage de phase dans l'impulsion, ce qui conduit à une modification du spectre en fréquence de l'impulsion.

Single-mode optical fiber

In fiber-optic communication, a single-mode optical fiber (SMF), also known as fundamental- or mono-mode, is an optical fiber designed to carry only a single mode of light - the transverse mode. Modes are the possible solutions of the Helmholtz equation for waves, which is obtained by combining Maxwell's equations and the boundary conditions. These modes define the way the wave travels through space, i.e. how the wave is distributed in space. Waves can have the same mode but have different frequencies.

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