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北京波威科技有限公司


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PMDE1000偏振模式色散仿真器（均衡器)

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PMDE1000 Polarization Mode Dispersion Emulator (Equalizer)Key featuresN+1 polarization scrambler modules (boards) EPS1000 with speeds up to 20 Mrad/s (or 50 Mrad/s) and N differential group delay (DGD

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PMDE1000 Polarization Mode Dispersion Emulator (Equalizer)

Key features

  • N+1 polarization scrambler modules (boards) EPS1000 with speeds up to 20 Mrad/s (or 50 Mrad/s) and N differential group delay (DGD) sections are integrated into one case. (Standard: 1U 19" rackmount)

  • Section DGDs can be switched.

  • Typical configuration: 3 EPS1000, 2 DGD sections (switchable, e.g., 15 ps, 50 ps, ..., or external)

  • Reasoning: See our contribution to PMD emulator standardization ａnd underlying arguments in arXiv:1903.05248 [eess.SP].

  • Applications: Polarization mode dispersion (PMD) emulator for coherent fiber links (400 Gb/s 80 km ZR, transoceanic links, Tb/s links, ...). PMD equalization (with user-supplied control signals).

  • Fully programmable (USB, LAN, GUI, Matlab, Python, C, ...)

  • We are eager to accommodate special requirements.

Physical model

北京波威科技有限公司
Top: Exemplary differential group delay profile, with overall first-order PMD being equal to sum of individual DGD or PMD vectors. Bottom: PMD emulator with N DGD sections (indices 1...N) placed between N+1 retarders/scramblers SCR (indices 0...N)

北京波威科技有限公司
Example: PMDE1000 with 3 EPS1000 ａnd 2 switchable DGD sections

Theory

We have shown here (Section V.) that the physical DGD section model (distributed or discrete) of PMD displayed above is the only one which makes sense because it approximates natural PMD best. (Higher-order PMD modeling based on a finite Taylor expansion of the PMD vector is unphysical because it inevitably predicts infinite PMD far off the optical reference frequency.) Here (Section II.A) is described why this is much more reasonable than the usage of variable DGD sections. PMD is emulated highly realistically by the usage of several EPS1000 ａnd DGD sections in the PMDE1000. => See our contribution to PMD emulator standardization ａnd underlying arguments in arXiv:1903.05248 [eess.SP].


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