, Volume 41, Issue 4, pp 235-242
Date: 25 Oct 2012

Phase control of absorption, dispersion and gain of weak signal field in erbium doped optical fiber

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We have studied the optical response of a weak signal field in a three-level quantum system consisting of the energy levels of Er3 + ions doped in ZrF4-BaF2-LaF3-AlF3-NaF (ZBLAN) fiber material. It has been shown that absorption and gain can be significantly modified by changing the conditions of phase-coherence induced in the system by the resonant fields. The role of broad-band incoherent pumping on gain equalization is investigated. Our results highlight gain leveling over a substantial range of frequencies at a particular condition of dynamically induced phase-coherence. On controlling phase-coherence, the propagation of signal field can be achieved either in subluminal or in superluminal regime.