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Solution 100G Coherent Optical Module

Specialty cable knowledge brief Published 19 Dec 2023

Prepared for preliminary research by the ZITHA SPECIALTY knowledge desk. Confirm fire performance, mechanical protection, loss budgets and installation requirements against current standards and product documentation.

100G coherent optical modules enable high-capacity, long-reach optical transmission over existing fiber infrastructure, supporting metro, regional, and data center interconnect applications.Overview

100G coherent optical modules, typically in QSFP28 form factors, use digital coherent optics (DCO) to transmit 100Gbps over single or multiple fiber strands. They leverage coherent modulation and dense wavelength division multiplexing (DWDM) to maximize fiber capacity, reduce per-bit cost, and extend reach beyond traditional intensity-modulated direct-detect (IM-DD) systems . These modules are ideal for upgrading existing 10G or 25G networks without extensive fiber replacement.

Key Features
  • Form Factor: QSFP28 modules, compact and pluggable for routers and switches .
  • Transmission Reach: Up to 80km over dark fiber and up to 300km over amplified DWDM links, depending on module type and network design .
  • Modulation: Quadrature Phase Shift Keying (QPSK) or dual-laser coherent designs for single-fiber, bi-directional transmission .
  • Power Efficiency: Low-power DSPs optimize energy consumption, typically 5–6W per module .
  • DWDM Compatibility: Tunable across C-band, supporting multiple channels on a single fiber for scalable capacity .
  • Applications: Metro access, aggregation networks, data center interconnect (DCI), campus networks, and wireless x-haul .
Vendor Solutions
  • Coherent 100G ZR QSFP-DCO: Dual-laser QSFP28 module for single-fiber bi-directional use, integrating a proprietary low-power DSP for IP-over-DWDM transmission, enabling 10x capacity expansion on existing 10G networks .
  • Nokia 100G ZR Modules: Flexible QSFP28 modules supporting 100G/OTU4, suitable for access and metro applications, and can be integrated directly into router line cards .
  • FS High-Power 100G Modules: Designed for long-reach metro and regional networks, integrating coherent DSP, tunable DWDM wavelengths, and high optical output power for direct deployment from standard switch ports .
  • Cisco QSFP28 100G ZR: Supports up to 80km over dark fiber and 300km over amplified DWDM, compliant with ITU-T standards, CMIS 5.2 management, and low-latency applications .
Benefits
  • Maximized Fiber Utilization: Coherent optics allow operators to double fiber inventory and increase capacity without new fiber deployment .
  • Cost Efficiency: Reduces per-bit cost by 40–70% compared to legacy DWDM systems .
  • Scalability: Supports incremental upgrades by swapping transceivers or adding channels, avoiding costly network rebuilds .
  • Flexibility: Single-fiber bi-directional modules simplify network architecture and expand reach to underserved areas . 100G coherent optical modules are now a mainstream solution for high-capacity optical networks, providing a balance of performance, reach, and cost-efficiency for modern metro, regional, and data center deployments.

Solution 100G Coherent Optical Module - ZITHA TECH SPECIALTY CABLES (Pty) Ltd [PDF]

Solution 100G Coherent Optical Module

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100G ZR is a transmission module leveraging advanced coherent modulation technology, designed to enable flexible deployment

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With one of the industry''s most comprehensive optical transceiver portfolios - ranging from 10G SFP+ to 1.6T QSFP-DD and OSFP

100G ZR QSFP28 Digital Coherent Optics Transceiver

Built around Coherent Steelerton DSP, the 100G ZR QSFP28-DCO transceiver is

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100G Coherent Transceivers

With one of the industry''s most comprehensive optical transceiver portfolios - ranging from 10G SFP+ to 1.6T QSFP-DD and OSFP

100G ZR QSFP28 Digital Coherent Optics Transceiver

Built around Coherent Steelerton DSP, the 100G ZR QSFP28-DCO transceiver is

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