Abstract
We developed a generalized field-propagating model for active optical fibers that takes into account mode beating and mode coupling through the amplifying medium. We applied the model to the particular case of a few-mode erbium doped fiber amplifier. Results from the model predict that mode coupling mediated by the amplifying medium is very low. Furthermore, we applied the model to a typical amplifier configuration. In this particular configuration, the new model predicts much lower differential modal gain than that predicted by a classical intensity model.
Highlights
In addition to Dense Wavelength Division Multiplexing (DWDM), Polarization Division Multiplexing (PDM) and multi-level modulation format, the most promising solution, for enhancing data transmission rates beyond those of SMF technology capacity crunch, seems to take benefit of an unused degree of freedom, namely space [1]
A generalized field model for few-mode fiber amplifiers including co- and counterpropagating beams and noise has been developed. This model is compatible with any eigenvector basis, and takes into account mode beating and mode coupling through the gain medium
It has been applied to a particular case of FM-Erbium Doped Fiber Amplifiers (EDFAs)
Summary
In addition to Dense Wavelength Division Multiplexing (DWDM), Polarization Division Multiplexing (PDM) and multi-level modulation format, the most promising solution, for enhancing data transmission rates beyond those of SMF technology capacity crunch, seems to take benefit of an unused degree of freedom, namely space [1]. Such a model is relevant to describe modal competition in fiber laser systems that are rarely single-mode or to evaluate quantities such as Differential Modal Gain (DMG) in few-mode optical amplifiers that are developed for SDM As it has been previously explained, it is important to have a better understanding of phenomena which take place during amplification and especially in multimode systems, so as to design a FM-EDFA. By using equations based on electric fields in a complete amplifier model, both mode beating and coupling through gain medium are taken into account, together with co and counter-propagating beams and noise Such a model gives, for example, the opportunity to predict cross-talk induced by the amplification media. Some results obtained with this model will be compared to results coming from an intensity FM-EDFA algorithm
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