Laming, R.I., Reekie, L. and Payne, D.N.
Multichannel crosstalk and pump noise in an Er3+-doped fibre amplifier pumped at 980nm
In Peoceedings of the 7th International on Integrated Optics and Optical Communication.
Institute of Electrical and Electronics Engineers., .
Full text not available from this repository.
Er3+-doped single-mode fibre amplifiers operating around 1.54µm are emerging as promising contenders for use in future high bit-rate long-haul communication systems. They have the advantage over semiconductor amplifiers of being wholly compatible with telecommunications fibre, thus eliminating both splice loss and end-face reflections which would be detrimental to amplifier performance, and are polarisation-independent. Fibre-to-fibre gains in excess of 34dB have been demonstrated with excellent saturation and noise performance. However, as with all optical amplifiers, noise on the pump (injection current or optical wave), will feed through to the amplified signal. In addition, owing to homogeneous broadening, competition for the available gain between two amplified channels closely-spaced in wavelength leads to inter-channel modulation in an ASK system. We show here that the very long fluorescent time-constant in Er3+ (tau = 14ms, cf 1ns for semiconductor amplifiers) suppresses these effects by >40dB at frequencies >100kHz, thus providing a further advantage for this type of amplifier
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