Abstract
Fiber-optical parametric amplifiers (FOPA) are positioned as the future leading technique for optical signal amplification. This type of amplifiers is highly appreciated due to their applications in all-optical signal processing. Signal amplification can be achieved using single-pump or dual-pump pumping schemes. Dual-pump FOPAs provide smoother gain over wider bandwidth than single-pump FOPAs, but it is harder to maintain high performance of dual-pump FOPAs due to the stimulated Raman scattering (SRS) induced energy transfer from one pump to another. In this paper the authors investigate the performance of a dual-pump FOPA under the influence of SRS in order to ensure higher gain using as low pump power as possible in a 4-channel 40 Gbps wavelength-division multiplexed transmission system. DOI: http://dx.doi.org/10.5755/j01.eie.23.6.19699
Highlights
Under the influence of the continuous development of multimedia services and their all-time growing availability, the demand for higher transmission system throughput has increased rapidly during the last two decades
Because the parametric gain is extremely sensitive to any mutual phase mismatch that occurs between the interacting spectral components, the pumps need to be symmetrically placed with respect to the zero dispersion frequency (ZDF), which was equal to 193 THz (ZDWL = 1553.35 nm)
It was required to select such pump frequencies that would represent the minimal spacing from the pumps to the ZDF of the highly nonlinear fibers (HNLF), that could ensure that the signal is placed in the flat part of the gain spectrum with as high gain as possible
Summary
Under the influence of the continuous development of multimedia services and their all-time growing availability, the demand for higher transmission system throughput has increased rapidly during the last two decades. According to the later Cisco Visual Networking Index (VNI) forecast, global IP traffic will reach 2.3 ZB per year, or 194 EB per month by the end of 2020 [1] This trend has resulted in rapid development of fiber optical transmission systems with wavelength division multiplexing (WDM). The commonly used type of amplifiers in such systems is erbium-doped fiber amplifiers (EDFA), but the conventional EDFA solutions are able to operate only in C wavelength band (1530 n–1562 nm) [2]. This brings to attention the use of other amplification schemes.
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