Nonlinear Four Wave Mixing suppression based on Serial OQPSK modulation
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Supriya S. Sindhu
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Joseph Zacharias
Abstract
Dense wavelength division multiplexing (DWDM) is used in optical fiber communication systems to increase the capacity. However, increasing power and decreasing channel spacing in DWDM system leads to non-linear effects like four wave mixing (FWM). In this paper, offset quadrature phase shift keying (OQPSK) modulation is done with the help of lithium niobate (LiNb) Mach–Zehnder modulators (MZM) to suppress the FWM. Here, a radio frequency (RF) carrier sine wave is used to improve the system performance. The OQPSK modulation is done here using two different configurations namely serial and parallel. Comparative analysis shows better system performance with FWM suppression for the serial OQPSK configuration than the parallel configuration. The efficacy of Serial OQPSK system is also confirmed by comparing it to other advanced modulation techniques such as 16-quadrature amplitude modulation (QAM) and polarization-multiplexed (PM)-QPSK.
Acknowledgments
Supriya S. Sindhu wishes to thank University Grants Commission, Government of India for granting research fellowship.
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Research ethics: Not applicable.
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Informed consent: Not applicable.
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Author contributions: The authors have accepted responsibility for the entire content of this manuscript and approved its submission. All the authors have directly participated in the planning, analysis and execution of this work and also in drafting the manuscript. The authors have read and approved the final form of the manuscript.
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Use of Large Language Models, AI and Machine Learning Tools: None declared.
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Conflict of interest: The authors state no conflict of interest.
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Research funding: None declared.
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Data availability: Not applicable.
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