Radiation physics and EMI coupling path determination for optical links

Li, Jing; Toor, Sukhjinder; Bhobe, Alpesh; Drewniak, James L.; Fan, Jun

doi:10.1109/isemc.2014.6899037

Cited by 10 publications

(6 citation statements)

References 4 publications

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“…Two EMI coupling paths from the entire link from the connector to the host board through the optical subassembly (OSA) and out the optical cable were proposed from the critical experiments detailed in [4], as shown in Fig. 1.…”

Section: Emi Coupling Path Determination For Optical Linksmentioning

confidence: 99%

“…An optical cage connector has been proposed as one of the main coupling paths in the link through the OSA [4], with the leakage point being the gap between the optical cage and the optical module enclosure. Before verifying the coupling path, a simulation model of the optical cage connector with the optical cage and module enclosure was verified.…”

Section: B Verification Of the Emi Coupling Physicsmentioning

confidence: 99%

“…Several papers have discussed EMI issues and solutions for optical transceiver modules [1]- [3]. In addition to these, the EMI coupling paths from the perspective of the entire optical link, including the optical cage connector, the connector housing/cage, the transceiver module, and the optical cable, have been addressed experimentally [4]. The optical cage connector has been identified as one of the major EM coupling paths, and it contributes to the leakage at the front of the system [4].…”

Section: Introductionmentioning

confidence: 99%

“…The coupling paths proposed in the previous study are briefly outlined in Section II [4]. The optical cage connector structure is detailed in Section III, and the model corroboration through total radiated power (TRP) measurement in a reverberation chamber (RC) is presented.…”

Section: Introductionmentioning

confidence: 99%

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EMI Coupling Paths and Mitigation in a Board-to-Board Connector

Xiao

Toor

et al. 2015

IEEE Trans. Electromagn. Compat.

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Cage connectors for optical subassembly I/O modules have been identified as one of the main coupling paths in an optical link at the front-end of switches and routers. In the study presented herein, the simulation model used to study electromagnetic interference coupling physics and mitigation of the optical cage connector was corroborated by comparing the measured and simulated results for the total radiated power (TRP). Currents on the adjacent ground references to the differential signal conductors caused half-wave resonant peaks in the TRP response in the frequency range of 4-18 GHz. At frequencies from 18 to 28 GHz, both full-wave simulation and analytical formulas indicate that the radiation results primarily from the currents on the signal traces. The radiation from the optical cage connector was suppressed with absorbing materials, and the coupling path was verified, together with the optical cage and module enclosure.Index Terms-Absorbing material, electromagnetic interference (EMI) coupling path, high frequency, mitigation, optical cage connector, radiation mechanism, total radiated power (TRP).

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Section: Emi Coupling Path Determination For Optical Linksmentioning

confidence: 99%

Section: B Verification Of the Emi Coupling Physicsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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EMI Coupling Paths and Mitigation in a Board-to-Board Connector

Xiao

Toor

et al. 2015

IEEE Trans. Electromagn. Compat.

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“…First, the interior EMI coupling paths and possible mitigation methods of optical modules are studied [1][2][3][4][5][6]. The internal mechanism can be analyzed to alleviate the radiation problem at the design stage or propose mitigation solutions.…”

Section: Introductionmentioning

confidence: 99%

High-Frequency Electromagnetic Interference Diagnostics

Zhang¹,

Feng²,

Fan³

et al. 2022

Electromagnetic Wave Propagation for Industry and Biomedical Applications

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Electromagnetic interference (EMI) is becoming more troublesome in modern electronic systems due to the continuous increase of communication data rates. This chapter reviews some new methodologies for high-frequency EMI diagnostics in recent researches. Optical modules, as a typical type of gigahertz radiator, are studied in this chapter. First, the dominant radiation modules and EMI coupling paths in an explicit optical module are analyzed using simulation and measurement techniques. Correspondingly, practical mitigation approaches are proposed to suppress the radiation in real product applications. Moreover, an emission source microscopy (ESM) method, which can rapidly localize far-field radiators, is applied to diagnose multiple optical modules and identify the dominant sources. Finally, when numerous optical modules work simultaneously in a large network router, a formula based on statistical analysis can estimate the maximum far-field emission and the probability of passing electromagnetic compatibility (EMC) regulations. This chapter reviews a systematic procedure for EMI diagnostics at high frequencies, including EMI coupling path analysis and mitigation, emission source localization, and radiation estimation using statistical analysis.

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