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Performance evaluation of mode group power coupling for short reach SDM.

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Title: Performance evaluation of mode group power coupling for short reach SDM.
Authors: Sandmann, André1 (AUTHOR) andre.sandmann@hs-wismar.de, Ahrens, Andreas1 (AUTHOR), Lochmann, Steffen1 (AUTHOR), Pachnicke, Stephan1 (AUTHOR)
Source: Optical Fiber Technology. Mar2019, Vol. 48, p22-27. 6p.
Subjects: Performance evaluation, Impulse response, Optical couplers, Single-mode optical fibers
Abstract: • Coupling matrix estimation method does not require exciting individual modes. • Simple measurement setup without free space components. • Optimal launch setup significantly differs between coupler technologies. • Small deviations to the optimal launch setup can significantly impair the BER. The profound understanding of mode coupling in spatial multiplexed optical systems is required for performance optimization purposes. In this contribution different optical coupler technologies are compared with respect to their bit-error rate (BER) performance as multiplex devices in a (2 × 2) multiple-input multiple-output (MIMO) environment. Therefore, the power coupling coefficients between mode groups for all testbed components are determined at 1327 nm with a method based on impulse response measurements. This method and its refinements are presented in this work. By taking the obtained power coupling coefficients, the MIMO impulse responses are simulated and the corresponding BER performance for different launch parameters is studied. The simulation setup includes single-mode fiber (SMF) to multi-mode fiber (MMF) splices aligned with different radial eccentricities for mode group specific excitation, different multi-mode couplers for mode multiplexing, a 1 km OM4 grade MMF and a multi-mode fusion coupler for demultiplexing. Here, the setup with the customized fusion coupler shows the best BER results in comparison to other coupler technologies. In addition, the optimal choice of the SMF to MMF launch eccentricity highly depends on the implemented coupler technology. Particularly, deviations of 2 μm from the optimal launch setup can lead to a tenfold increase in the BER. It is noteworthy, that the optimal setup does not always include the center launch condition. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:• Coupling matrix estimation method does not require exciting individual modes. • Simple measurement setup without free space components. • Optimal launch setup significantly differs between coupler technologies. • Small deviations to the optimal launch setup can significantly impair the BER. The profound understanding of mode coupling in spatial multiplexed optical systems is required for performance optimization purposes. In this contribution different optical coupler technologies are compared with respect to their bit-error rate (BER) performance as multiplex devices in a (2 × 2) multiple-input multiple-output (MIMO) environment. Therefore, the power coupling coefficients between mode groups for all testbed components are determined at 1327 nm with a method based on impulse response measurements. This method and its refinements are presented in this work. By taking the obtained power coupling coefficients, the MIMO impulse responses are simulated and the corresponding BER performance for different launch parameters is studied. The simulation setup includes single-mode fiber (SMF) to multi-mode fiber (MMF) splices aligned with different radial eccentricities for mode group specific excitation, different multi-mode couplers for mode multiplexing, a 1 km OM4 grade MMF and a multi-mode fusion coupler for demultiplexing. Here, the setup with the customized fusion coupler shows the best BER results in comparison to other coupler technologies. In addition, the optimal choice of the SMF to MMF launch eccentricity highly depends on the implemented coupler technology. Particularly, deviations of 2 μm from the optimal launch setup can lead to a tenfold increase in the BER. It is noteworthy, that the optimal setup does not always include the center launch condition. [ABSTRACT FROM AUTHOR]
ISSN:10685200
DOI:10.1016/j.yofte.2018.12.010