FOPA Pump Phase Modulation and Polarization Impact on Generation of Idler Components

Sergejs Olonkins,Girts Ivanovs,Vjaceslavs Bobrovs

doi:10.5755/j01.eie.22.4.15924

Abstract

Fiber optical parametric amplifiers (FOPA) are well known for the variety of potential applications in all-optical signal processing. Many of these applications use the idler spectral components that are produced by the four wave mixing parametric process. The performance of parametric amplifiers and, therefore, also of generation of idler spectral components, is highly dependent on different factors, including stimulated Brillouin scattering (SBS) and polarization of the input signal. The aim of this article is to investigate the influence of pump phase modulation of parametric amplifiers, used for SBS mitigation, and the impact of mutual state of polarization mismatch of the input signal and the pump on the generation of idler spectral components. The obtained results have shown that it is crucial for systems with FOPAs to ensure that the input signal and the pump are co-polarised, as polarization dependant gain of 16.7 dB and 33.5 dB difference in idler generation was observed in the performed simulations. It was also found that applying the phase-modulation of the pump for SBS mitigation has caused 54 % idler spectral broadening. Therefore additional measures must be taken to avoid inter-channel crosstalk among the neighbour channels. DOI: http://dx.doi.org/10.5755/j01.eie.22.4.15924

Highlights

To satisfy the constantly increasing demand for higher network capacity, fiber optical transmission systems with wavelength division multiplexing (WDM) have been intensively studied and applied, as WDM technology allows using the available optical fiber resources more efficiently than alternative technologies [1]–[3]
It is possible to increase the WDM system throughput capacity either by increasing the data transmission speed in channels or the number of channels. Both ways require to enlarge the wavelength band that is used for transmission, but in WDM systems it is limited due to the wavelength dependence of signal attenuation in optical fibers and due to limited amplification wavelength band of conventional erbiumdoped fiber amplifiers (EDFA), that are the dominative type of optical amplifiers used in modern transmission systems [4]
The first one was a simplified model of a single-channel transmission system that was used to assess the dependence of fiber optical parametric amplifiers (FOPA) idler generation efficiency on the mutual state of polarization (SOP) mismatch between the pump and the input signal. 33.5 dB difference of idler generation efficiency was observed between the cases when the signal and the pump were linearly co-polarized and linearly orthogonally polarized

Summary

Introduction

To satisfy the constantly increasing demand for higher network capacity, fiber optical transmission systems with wavelength division multiplexing (WDM) have been intensively studied and applied, as WDM technology allows using the available optical fiber resources more efficiently than alternative technologies [1]–[3]. It is possible to increase the WDM system throughput capacity either by increasing the data transmission speed in channels or the number of channels Both ways require to enlarge the wavelength band that is used for transmission, but in WDM systems it is limited due to the wavelength dependence of signal attenuation in optical fibers and due to limited amplification wavelength band of conventional erbiumdoped fiber amplifiers (EDFA), that are the dominative type of optical amplifiers used in modern transmission systems [4]. Types of optical amplifiers in optical transmission systems, especially to fiber optical parametric amplifiers (FOPA) This type of amplifiers, in comparison with conventional EDFAs, can ensure high level of amplification and low noise figure values over relatively large wavelength band, and can ensure amplification almost at any wavelength. Both bandwidth up to 208 nm [5] and gain up to 70 dB [6] have been demonstrated

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Conclusion