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中国物理B：英文版

Controlling the gain shape of Er^3＋—doped fluorozirconate fibre amplifier by a coherent field

张惠芳, 吴金辉, 高锦岳

Published Mar 16, 2005• 0 citations
Publisher

Abstract

We proposed a four-level system to explore the quantum interference effects on optical amplification.We found that the gain of the probe.including positions and values of gain peaks,can be adjusted by changing the coherent field and the incoherent pumping.At the same time,we can also modify the absorption profile of electromagnetically induced transparency by the incoherent pump.The results provide a method to flatten the gain of Erbium-doped fibre amplifiers.

DOI
10.1088/1009-1963/12/2/011

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We proposed a four-level system to explore the quantum interference effects on optical amplification.We found that the gain of the probe.including positions and values of gain peaks,can be adjusted by changing the coherent field and the incoherent pumping.At the same time,we can also modify the absorption profile of electromagnetically induced transparency by the incoherent pump.The results provide a method to flatten the gain of Erbium-doped fibre amplifiers.
A four-level system is proposed to explore the quantum-interference effects on optical amplification. It is found that the gain of the probe including positions and values of gain peaks can be adjusted by changing the coherent field and the incoherent pumping. As an application of the results, a scheme composed of three same Er3+{\mathrm{Er}}^{3+}Er3+-doped ${\mathrm{ZrF}}_{4}\ensuremath{-}{\mathrm{BaF}}_{2}\ensuremath{-}{\mathrm{LaF}}_{3}\ensuremath{-}{\mathrm{AlF}}_{3}\ensuremath{-}\mathrm{NaF}$ Optical Fibers with different coherent fields and incoherent pumpings is brought forward to equalize the gain of the probe.
A four-level system driven by two coherent fields is considered. It is shown that in the presence of an incoherent pump, the probe gain at a short wavelength can be achieved due to the quantum interference. Our density matrix calculation provides the conditions for probe amplification from different origins, including gain without population inversion on any state basis, gain with population inversion on the dressed-state basis and gain with population inversion on the bare-state basis. Also, by controlling the Rabi frequency of the coupling field a total change from non-inversion to inversion can be achieved which does not depend on the intensity of the incoherent pump.
A four-level system driven by two coherent fields is considered. the probe gain at a short wavelength can be achieved due to the quantum interference in the presence of an incoherent pump. The density matrix calculation provides the conditions for probe amplification from different origin, including gain without population inversion in any state basis, gain with population inversion in the dressed-state basis, and gain with population inversion in the bare-state basis. Also, by controlling Rabi frequency of the coupling field a totally changing from non-inversion to inversion can be achieved which does not depend on the intensity of the incoherent pump.
Summary form only given. We investigate special coupling effects in an Er-doped optical fibre amplifier, of which the gain medium is optically pumped by two mutually coherent counterpropagating pump waves that interfere inside the amplifier. The result is a unique filtering behavior where the signal gain becomes dependent on the wavelength and on the optical phases of the pump waves. This effect can be used for obtaining filters and single-mode operation of lasers. The wavelength of such a laser can be controlled by changing the wavelength or the phases of the pump waves. We have also shown previously that bidirectional pumping may cause bistability.
A four-level system is proposed to produce large index of refraction accompanied by vanishing absorption in the Er3+{\mathrm{Er}}^{3+}Er3+-doped yttrium aluminum garnet crystal. It is found that the separation of the two absorption peaks and the maximum value of index of refraction with zero absorption can be adjusted by changing the coherent field and the incoherent pumping. It is shown that a higher index of refraction with zero absorption can be easily obtained when the coherent field is off resonance.