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Turn-Up-Retune-and-Reacquisition-Timing-in-Coherent-Interfaces_13_08_2026_18_39_43

Turn-Up, Retune, and Reacquisition Timing in Coherent Interfaces

Four timing cases separate a 40 ms recovery from a 200 s one, and the difference …
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  • August 13, 2026
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Span-Loss-Capability-and-GOSNR-Margin-Two-Separate-Ceilings_12_08_2026_22_08_48

Span Loss Capability and GOSNR Margin: Two Separate Ceilings in Long-Span Design

A long span fails in one of two distinct ways: the amplifier …
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  • August 12, 2026
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First-Second-and-Third-Order-Raman-Pumping_12_08_2026_21_53_58

First, Second, and Third Order Raman Pumping

Why cascaded pumping moves the gain region rather than simply adding gain, and what that buys on spans …
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  • August 12, 2026
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Optical-Circuit-Switching-Principles_05_08_2026_21_06_50

Optical Circuit Switching: MEMS Steering and Loss Budgets

Mirror steering sets the port count, transparency sets the service life, and insertion loss decides whether …
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  • August 5, 2026
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FEC-families-for-coherent-interfaces-CFEC-and-OFEC_05_08_2026_21_01_18

FEC Families for Coherent Interfaces: CFEC and OFEC

Hard-decision and soft-decision coding, net coding gain, overhead and latency per family, and the interface class …
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  • August 5, 2026
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Know-Your-Fiber-First-featured-image_05_08_2026_20_52_40

Know Your Fiber First: Fiber Parameters and Capacity

Attenuation, effective area, dispersion and PMD set the OSNR budget, the launch power optimum, the repair …
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  • August 5, 2026
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BOL-and-EOL-margin-design-for-OSNR-GOSNR-and-Q-featured-image

BOL and EOL Margin Design for OSNR, GOSNR and Q

How the beginning-of-life and end-of-life operating points of an amplified link are …
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  • August 1, 2026
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Inter-Band-Raman-Transfer-in-Loaded-CL-Systems_01_08_2026_01_19_47

Inter-Band Raman Transfer in Loaded C+L Systems

In a loaded C+L system the C-band channels are themselves Raman pumps for the L-band channels. The resulting tilt scales...
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  • August 1, 2026
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Distributed-Raman-Amplification-for-High-Loss-CL-Band-Spans_01_08_2026_01_10_24

Distributed Raman Amplification for High-Loss C+L Band Spans

Where the EDFA-only budget runs out, distributed Raman buys back OSNR inside the transmission fiber. This is the pump geometry,...
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  • August 1, 2026
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GOSNR-Versus-OSNR-The-Analytical-Relationship_25_07_2026_21_24_23

GOSNR Versus OSNR: The Analytical Relationship

How amplified spontaneous emission and nonlinear interference combine into a single feasibility metric, and what the composition rule implies for...
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  • July 25, 2026
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