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Regenerative mode demultiplexer with application to MIMO-free MDM systems.

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Title: Regenerative mode demultiplexer with application to MIMO-free MDM systems.
Authors: Chen, Yanjun1 (AUTHOR), Wu, Baojian1 (AUTHOR) bjwu@uestc.edu.cn, Ma, Xinyu1 (AUTHOR), Wen, Feng1 (AUTHOR), Qiu, Kun1 (AUTHOR)
Source: Applied Physics B: Lasers & Optics. Dec2025, Vol. 131 Issue 12, p1-11. 11p.
Subjects: Semiconductor optical amplifiers, Multiplexing, Optical communications, Optical communications equipment, Quality factor, Coupled mode theory (Wave-motion)
Abstract: Mode division multiplexing (MDM) is capable of effectively enhancing the spectral efficiency of optical communication systems. However, practical mode demultiplexers inevitably introduce mode crosstalk and then result in the degradation of mode extinction ratio (MER). To improve the transmission performance of MDM systems, we propose an all-optical regeneration scheme using a nonlinear bidirectional semiconductor optical amplifier (SOA), and combine it with a passive mode demultiplexer (MDEMUX) to form the called regenerative MDEMUX. Simulations show that the regenerative MDEMUX has an MER improvement of about 6.5 dB for the LP01 and LP11 modes compared with the passive MDEMUX. To effectively suppress the co-frequency mode crosstalk, the regenerative MDEMUX can be applied to the MIMO-free MDM systems and the maximal Q-factor improvement of on–off keying (OOK) signals is up to 1.99 dB and 2.06 dB for the two modes, respectively. The dependencies of Q-factor improvement on mode crosstalk frequency spacing, bit rate, modal power, modulation format and ASE noise are also discussed. The proposed regeneration scheme is applied to the future MDM systems and all-optical switching nodes. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:Mode division multiplexing (MDM) is capable of effectively enhancing the spectral efficiency of optical communication systems. However, practical mode demultiplexers inevitably introduce mode crosstalk and then result in the degradation of mode extinction ratio (MER). To improve the transmission performance of MDM systems, we propose an all-optical regeneration scheme using a nonlinear bidirectional semiconductor optical amplifier (SOA), and combine it with a passive mode demultiplexer (MDEMUX) to form the called regenerative MDEMUX. Simulations show that the regenerative MDEMUX has an MER improvement of about 6.5 dB for the LP01 and LP11 modes compared with the passive MDEMUX. To effectively suppress the co-frequency mode crosstalk, the regenerative MDEMUX can be applied to the MIMO-free MDM systems and the maximal Q-factor improvement of on–off keying (OOK) signals is up to 1.99 dB and 2.06 dB for the two modes, respectively. The dependencies of Q-factor improvement on mode crosstalk frequency spacing, bit rate, modal power, modulation format and ASE noise are also discussed. The proposed regeneration scheme is applied to the future MDM systems and all-optical switching nodes. [ABSTRACT FROM AUTHOR]
ISSN:09462171
DOI:10.1007/s00340-025-08589-7