optical-network 归档 - 第2页共3页

PAM4 vs NRZ: Modulation Behind 100G, 400G and 800G Optics

PAM4 vs NRZ explained for 100G, 400G and 800G optics: bits per symbol, the 9.5 dB SNR penalty, why KP4 FEC is mandatory, TDECQ, DSP and link troublesh

admin 2026-09-09

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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 2026-09-08

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Optical Transceiver Power: Reading Rx/Tx dBm Correctly

Read SFP DOM light levels correctly: Tx and Rx power in dBm, typical ranges for 1G and 10G SR/LR optics, warning vs alarm thresholds and fault pattern

admin 2026-09-07

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SFP vs SFP+ vs SFP28 vs QSFP28: Types and Compatibility

SFP, SFP+, SFP28, QSFP+ and QSFP28 compared: lane counts, speeds, standards, vendor coding, DAC/AOC cables and the port compatibility rules that matte

admin 2026-09-06

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SFP Optical Transceiver Troubleshooting: Engineer's Checklist

SFP transceiver troubleshooting checklist: read DOM data, clean end faces, check coding, compare Tx and Rx power on both ends, then isolate the fault.

admin 2026-09-02

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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 2026-09-02

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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 2026-09-01

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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 2026-08-30

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CWDM 与 DWDM 波分复用器详解：原理与选型指南

CWDM 与 DWDM 波分复用器详解：完整拆解 WDM 系统组成部件，列出 CWDM 的 18 个标准波长与 DWDM 信道间隔，给出 40 公里链路预算算例、CWDM 与 DWDM 部署对比表、ROADM 功率均衡要点以及施工验收与常见问题解答。

admin 2026-08-29

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400G Spine 与 100G Leaf 混合架构：链路一致性保障方案

400G Spine 与 100G Leaf 混合架构的链路一致性实践：Breakout 拆分配置与完整验证流程、FEC 模式必须两端显式指定、端口组与光模块兼容性约束、收敛比与 ECMP 等价路径设计，确保 AI 数据中心的高速链路稳定可靠。

admin 2026-08-27

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标签：optical-network