The nonlinear optical loop mirror: soliton and noise-like pulse emission in a figure-eight fiber laser

A. Camarillo-Avilés, E. Hernández-Escobar, R. López-Estopíer, M. Bello-Jiménez, O. Pottiez, B. Ibarra- Escamilla, M. Duran-Sánchez, M. V. Andrés


In this article, a symmetrical nonlinear optical loop mirror (NOLM) exhibiting a polarization-dependent transmission is evaluated to generate optical pulse emission in a figure-eight fiber laser in the soliton and noise-like pulse (NLP) regimes. The NOLM structure relies on a 50:50 fiber coupler, a loop with highly twisted single-mode optical fiber and a quarter-wave retarder (QWR) to break the polarization asymmetry. The pulse operation regime is determined by properly adjusting the NOLM low-power transmission, which is easily realized by the rotation of the QWR angle. Soliton pulses of 1.48 ps pulse duration and peak power of 18 W were observed with a peak to peak separation of 1.25 µs, corresponding to a fundamental cavity repetition rate of 0.8 MHz. Moreover, by incrementing the NOLM low-power transmission, NLP emission is generated exhibiting a wide and smooth spectrum of 8.5 nm bandwidth.


Erbium doped fiber; soliton pulse; noise-like pulse; nonlinear optical loop mirror; fiber lasers

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