Co-axial dual-core resonant leaky fibre for optical amplifiers

Ajeet Kumar (1) , Vipul Rastogi (1) , Charu Kakkar (2) , Bernard Dussardier (3)

1 IIT Roorkee - Indian Institute of Technology Roorkee
2 Department of Physics, Kirorimal College
3 LPMC - Laboratoire de physique de la matière condensée

We present a co-axial dual-core resonant leaky optical fibre design, in which the outer core is made highly leaky. A suitable choice of parameters can enable us to resonantly couple power from the inner core to the outer core. In a large-core fibre, such a resonant coupling can considerably increase the differential leakage loss between the fundamental and the higher order modes and can result in effective single-mode operation. In a small-core single-mode fibre, such a coupling can lead to sharp increase in the wavelength dependent leakage loss near the resonant wavelength and can be utilized for the suppression of amplified spontaneous emission and thereby gain equalization of an optical amplifier. We study the propagation characteristics of the fibre using the transfer matrix method and present an example of each, the large-mode-area design for high power amplifiers and the wavelength tunable leakage loss design for inherent gain equalization of optical amplifiers.

Mots clés: single-mode fibre; large-mode-area-fibre; leakage loss; confinement loss; fibre laser; optical communication; dense-wavelength-division-multiplexing; gain flattening; amplified spontaneous emission; erbium doped fibre amplifier

Domaines: Optique [physics.optics]; Optique / photonique

Ajeet Kumar, Vipul Rastogi, Charu Kakkar, Bernard Dussardier. Co-axial dual-core resonant leaky fibre for optical amplifiers. Journal of Optics A: Pure and Applied Optics, 2008, 10, page 115306. ⟨10.1088/1464-4258/10/11/115306⟩. ⟨hal-00459451⟩