Reflective semiconductor optical amplifier pattern effect compensation with birefringent fiber loop
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Reflective semiconductor optical amplifier pattern effect compensation with birefringent fiber loop Kyriakos E. Zoiros1 · Dimitrios Kastritsis1,2 · Thierry Rampone2 · Ammar Sharaiha2 Received: 16 May 2020 / Accepted: 17 July 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract We experimentally explore and demonstrate the potential of a birefringent fiber loop (BFL) to compensate for the pattern effects (PE) induced in a reflective semiconductor optical amplifier (RSOA), which is driven by optical data whose intensity, temporal and spectral characteristics heavily stress the RSOA. By properly tailoring the BFL comb-like profile and adjusting the relative offset between the BFL maximum transmission and carrier signal position, the BFL improves the RSOA pattern-dependent performance even though the input pulses’ modulation bandwidth exceeds the 3 dB cut-off frequency of the RSOA optical response. The extensive set of obtained experimental results confirms the BFL capability to enhance the RSOA operation even under strong saturation, since the BFL acts in a beneficial manner on the amplified pulses by reducing their overshoot to an acceptable level, restoring their spectral position, reshaping their eye diagram and increasing their input power dynamic range. These notable improvements, combined with the construction from off-the-shelf components, straightforward implementation, simplicity of operation and flexibly tunable transmission characteristics, render the BFL an attractive solution for efficiently combating the RSOA PE and resolving its undesirable complications. Keywords Birefringent fiber loop · Offset filtering · Optical modulation · Pattern effect · Reflective semiconductor optical amplifier
1 Introduction Reflective semiconductor optical amplifiers (RSOAs) are special type SOAs with an antireflective coating on the front facet and a high reflectivity coating on the rear end (Prat 2008). This versatile active device allows using the same facet both for signal input injection and output extraction, thus enabling full-duplex signal transmission with reduced cost and complexity owing to single fiber connection and simple packaging. This feature has been combined with RSOAs capability of providing higher gain at lower injection currents * Kyriakos E. Zoiros [email protected] 1
Lightwave Communications Research Group, Department of Electrical and Computer Engineering, Democritus University of Thrace, 67 100 Xanthi, Greece
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Lab‑STICC UMR CNRS 6285, École Nationale D’Ingénieurs de Brest, 29 238 Brest, France
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and with lower noise figure and less temperature and polarization dependency than their conventional counterparts (Connelly 2012) to realize diverse applications in the optical domain, as indicatively reported in (Guo and Connelly 2008; Kotb et al. 2018; Peng et al. 2013; Wang et al. 2017, Wei and Krishnaswamy 2017; Wong 2012; Zhang et al. 2007). However, RSOAs internal structure also forces the forw
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