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OTN G.709 Framing: OTU, ODU and OTUCn Transport Layers

OTN G.709 Framing: OTU, ODU and OTUCn Transport Layers

Understand OTN G.709 framing: OTU and ODU layers, OPU payload mapping, FEC overhead and how OTUCn scales transport past 100G.

admin admin 2026-10-09
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Optical Power Budget: How to Calculate a Fiber Link

Optical Power Budget: How to Calculate a Fiber Link

Calculate a fiber link loss budget before pulling cable: Tx power minus Rx sensitivity, dB/km, connector, splice and splitter values, with worked exam

admin admin 2026-09-14
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DWDM 50GHz vs 100GHz Channel Spacing on the ITU Grid

DWDM 50GHz vs 100GHz Channel Spacing on the ITU Grid

ITU-T G.694.1 fixed and flexible DWDM grids: wavelength maths, 50GHz vs 100GHz trade-offs, filtering and OSNR cost, migration and a validation checkli

admin admin 2026-09-14
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Coherent Optics: Pre-FEC BER, OSNR and DSP Checks

Coherent Optics: Pre-FEC BER, OSNR and DSP Checks

Coherent module troubleshooting beyond optical power: pre-FEC vs post-FEC BER, OSNR margin, DSP lock, frequency offset and EVM thresholds explained.

admin admin 2026-09-13
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ROADM Power Equalization and APC Explained

ROADM Power Equalization and APC Explained

Why per-channel power drifts in DWDM, how APC and ROADM equalization correct it, and the amplifier modes, span loss and OSNR margin checks that keep i

admin admin 2026-09-13
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800G ZR/ZR+ Coherent Pluggables: IPoDWDM Design Guide

800G ZR/ZR+ Coherent Pluggables: IPoDWDM Design Guide

How 800G ZR/ZR+ QSFP-DD coherent pluggables work, what ZR versus ZR+ modes deliver in reach and output power, and when IPoDWDM wins over a transponder

admin admin 2026-09-12
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DWDM System Components: MUX, EDFA and DEMUX Explained

DWDM System Components: MUX, EDFA and DEMUX Explained

Learn DWDM building blocks: transponders, MUX/DEMUX and ROADM filters, singlemode fiber, EDFA and Raman amplifiers, ASE and OSNR reach limits.

admin admin 2026-09-08
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CWDM vs DWDM: Which Wavelength Technology to Choose?

CWDM vs DWDM: Which Wavelength Technology to Choose?

CWDM vs DWDM explained: channel spacing, water-peak reach, cost, channel plans, power budgeting and the migration path between the two technologies.

admin admin 2026-09-02
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DWDM Explained: Dense Wavelength Division Multiplexing

DWDM Explained: Dense Wavelength Division Multiplexing

DWDM basics explained: C-band operation, the ITU grid, EDFA amplification, 50GHz vs 100GHz spacing, fiber types, protection and troubleshooting.

admin admin 2026-09-01
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OTDR Testing Basics: Measuring Fiber Links and Locating Faults

OTDR Testing Basics: Measuring Fiber Links and Locating Faults

Learn OTDR fundamentals: backscatter, key settings (wavelength, pulse width, RI), reading events and dead zones, and a workflow that locates fiber fau

admin admin 2026-08-30
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