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Optical amplifier noise figure in a coherent optical transmission system

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3 Author(s)
Walker, G.R. ; British Telecom Res. Lab., Martlesham Heath, UK ; Steele, R.C. ; Walker, N.G.

Two important aspects of optical amplifier noise figure as measured with a heterodyne detection receiver are investigated. First, differential mode gain will result in polarization-dependent degradation of the perceived amplifier noise figure, even when the noise figures for the TE and TM modes of the amplifier are the same. For a differential mode gain of 7.5 dB the noise figure degradation can be as large as 3 dB, and experimental data is reported in good agreement with theoretical predictions. Secondly, the first experimental demonstration of the use of image-rejection techniques to improve the sensitivity of a heterodyne receiver limited by beat noise between the local oscillator and amplified spontaneous emission is discussed

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Lightwave Technology, Journal of  (Volume:8 ,  Issue: 9 )