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Advancing 40Gbps Duo-Binary Applications: Insights on System Bandwidth and Filtering Technologies

This article explores the complexities of achieving optimal filtering components for 40Gbps duo-binary applications. It delves into the system bandwidth, driver bandwidth, and the effects of thin film technology on filter design. Key parameters such as return loss and group delay are discussed alongside practical case studies and measurement techniques. The insights provided will assist in the design, simulation, and implementation of effective filtering solutions tailored for high-speed optical modulation schemes.

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Advancing 40Gbps Duo-Binary Applications: Insights on System Bandwidth and Filtering Technologies

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  1. Bringing Reality to 40Gbps Duo-Binary Applications Understanding System Bandwidth 2-20-2008 ARahman,MBroman,MHowieson

  2. Ideal DuoBinary System Bandwidth

  3. Ideal DuoBinary System Bandwidth • Driver Bandwidth=20GHz

  4. Network Bandwidth Approximation • Good for ideal single pole filters only

  5. From 10Gbps to 40Gbps • As the Target Bandwidth approaches the system bandwidth the filter bandwidth goes to infinity

  6. Important Filter Parameters • Enhancing the Bessel filters return loss • Controlling Group Delay • Electrical Length effects

  7. Thin Film Technology to the Rescue • Design • Simulation • Components • Package and footprint normalizing • BGA, Wirebond • Test Bench • CMM’s and Measurement

  8. Case Studies in 40Gbps • L3 Narda Application Measurements

  9. Conclusion • The difficulties in achieving optimum filtering components for duo-binary optical modulation schemes are realized with simulation and design aide from Thin Film Technology Corp.

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