Article Overview

Popular 100G optical modules include Cisco QSFP-100G, FS QSFP28, and various SR4, LR4, CWDM4, and ZR4 models suitable for different distances and fiber types.

Major Brands and Form Factors

1. Cisco QSFP-100G Modules Cisco offers a wide range of 100GBASE QSFP modules, including:

  • 100GBASE-SR4-S: Supports up to 70m on OM3 and 100m on OM4 multimode fiber with MPO connectors, ideal for short-distance data center links.
  • 100GBASE-SL4: Short link module supporting 20m on OM3 and 30m on OM4 multimode fiber. These modules are hot-swappable, IEEE-compliant, and certified for Cisco QSFP-100G ports, ensuring high performance and reliability . 2. FS QSFP28 Modules FS provides a broad 100G QSFP28 portfolio, including:
  • SR4, LR4, PSM4, CWDM4, 4CWDM-10, ER4, ZR4
  • Dual Rate and Single Lambda modules These modules use LC or MTP/MPO connectors and operate over single-mode or multimode fiber, supporting distances from 100m up to 80km. They are suitable for 100G Ethernet and OTU4 applications, with some modules using PAM-4 modulation for single 100Gbit/s optical signals . 3. Other QSFP28 Module Types
  • SR4: Short-range, multimode fiber, 100m–150m, MPO/MTP interface.
  • DR1/DR4: Medium-range, single-mode fiber, LC or MPO interface, suitable for intra-data center links up to 500m.
  • LR4: Long-range, single-mode fiber, LC duplex interface, up to 10km.
  • CWDM4: Coarse Wavelength Division Multiplexing, single-mode fiber, 2km–2km range, LC duplex interface.
  • ZR4: Extended reach, single-mode fiber, up to 80km, LC duplex interface .

Key Features and Considerations

  • Form Factor: QSFP28 is the standard for 100G modules, offering high port density and low power consumption.
  • Modulation: Modules may use NRZ, PAM4, or coherent modulation depending on distance and application.
  • Connector Types: LC duplex for single-mode, MPO/MTP for multimode parallel fiber.
  • Applications: Data centers, enterprise core networks, telecom infrastructure, and high-performance computing.
  • Distance Range: Short (100m), medium (500m), long (10km), and extended (up to 80km) depending on module type and fiber used.

Summary

When selecting a 100G optical module, consider the brand (Cisco, FS, Asterfusion, etc.), form factor (QSFP28), transmission standard (SR4, LR4, CWDM4, ZR4), fiber type, and distance requirements. Cisco and FS are leading providers with certified modules for data center and telecom applications, while other vendors offer specialized modules for specific distances and modulation technologies .

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