Article Overview
QSFP28 modules use integrated laser diodes to transmit 100Gb/s optical signals over single-mode or multimode fiber, supporting high-speed data center and metro network applications.
Key Features of QSFP28 Laser Diodes
QSFP28 (Quad Small Form-factor Pluggable 28) transceivers convert 4×25Gb/s electrical signals into optical signals using laser diodes, typically Distributed Feedback (DFB) lasers or CWDM DFB lasers . These lasers operate at specific wavelengths (e.g., 1296 nm, 1300 nm, 1305 nm, 1309 nm) and are multiplexed to a single fiber for high-speed transmission . The modules are hot-pluggable, low-power, and compliant with IEEE 802.3 standards, supporting data rates up to 103.125 Gbps or 111.81 Gbps aggregated .
Types and Packaging
Laser diodes in QSFP28 modules are often packaged in TO46/TO56 hermetically sealed cans, providing excellent thermal management and high-frequency signal integrity . This packaging ensures long-term reliability in harsh environments, making them suitable for data centers, short-range optical links, and fiber optic sensors . Some modules use uncooled CWDM DFB lasers for cost-effective solutions with moderate reach, typically up to 2 km .
Transmission Reach and Standards
QSFP28 modules support a range of transmission distances depending on the laser type:
- LR4 modules: Up to 10 km over single-mode fiber using LAN WDM TOSA/ROSA integrated lasers .
- CWDM4 modules: Typically up to 2 km with four 25Gb/s DFB lasers .
- Extended reach modules (ER4, ZR4): Can reach 40 km to 80 km for metro or long-haul networks . These modules comply with QSFP28 MSA, SFF-8636, IEEE 802.3bm, and ITU-T G.959.1 standards, ensuring interoperability across vendors .
Applications
QSFP28 laser diodes are widely used in:
- 100G data center interconnects
- High-speed enterprise networks
- Metropolitan area networks (MANs)
- Fiber optic sensing and short-range optical links The combination of high-speed performance, compact form factor, and reliable laser diodes makes QSFP28 modules ideal for modern high-bandwidth networking environments .
Summary
QSFP28 laser diodes are high-performance, wavelength-specific lasers integrated into compact transceivers, enabling 100Gb/s optical communication. They offer flexible reach options, robust thermal management, and compliance with industry standards, making them essential components for data centers, metro networks, and optical sensing applications .
QSFP28-LR1
Features: Compliant with QSFP28 Standard SFF-8636 Rev 2.9 Compliant with 100G Lambda MSA High speed I/O electrical
100Gb/s QSFP28 Transceivers | Optical Interconnect | Amphenol
Amphenol''s 100G QSFP28 optical modules include SR4, AOC, AOC break out, CWDM4, LR4, ER4 Lite, ER4 and
Intel® Silicon Photonics 100G DR/FR/LR QSFP28 Optical Transceiver
Intel® Silicon Photonics 100G DR/FR/LR QSFP28 Optical Transceiver quick reference with specifications, features, and technologies.
QSFP28 Transceiver: Complete 100G Connectivity Guide (2026)
QSFP28 transceiver guide covering module types, pricing, compatibility, and deployment. Learn how to choose,
Future-Proof Your Data Center with Single-Lambda 100G QSFP28 DR
Future-Proof Your Data Center with Single-Lambda 100G QSFP28 DR 100G data rate without optical complexity Over the past
QSFP28 Transceiver: Complete 100G Connectivity Guide
Complete guide to QSFP28 transceivers: SR4, LR4, CWDM4 module types, switch
100G QSFP28 Single Lambda
Experience high-speed data transmission with our 100G QSFP28 Single Lambda transceiver module, delivering 2 x 50Gbps
The QSFP28 100G FR single laser, a competitor to the CWDM4?
The single laser 100Gbps PAM4, also called single lambda or 100GBASE-FR While the QSFP28 electrical interface
Things You May Want to Know About 100G QSFP28 【FAQs】
100G QSFP28 is designed to carry 100 Gigabit Ethernet, providing a high-density and high-speed solution for data
What Is QSFP28? A Clear Explanation of 100G Transceivers
Learn what QSFP28 is, how 100G transceivers work, key standards, module types, and common deployment scenarios in modern
100Gb/s QSFP28 Transceivers
FEATURES & BENEFITS Hot-pluggable QSFP28 form factor Single 3.3V power supply Four-channel full duplex Up to 27.95Gb/s
100GBASE-LR4 QSFP28 1310nm 10km Transceiver Datasheet | FS
The QSFP28 module provides 100GBase-LR4 throughput up to 10km over a standard pair of single mode fiber (SMF) with duplex LC
QSFP28 CLR4 Transceiver
SFF-8679 low power CWDM optical transceiver with high port densities and compact size. Each transceiver incorporates four direct
Optischer Intel® 100G-LR4-QSFP28-Silizium-Photonik-Transceiver
• Compact QSFP28 form factor for high faceplate density in networking equipment • Compatibility with single-mode fiber connectors
QSFP28 Optical Transceiver 100 Gigabit Ethernet for up to 10 km Reach
The Lumentum 100G QSFP28 Optical Transceiver is RoHS 6/6 compliant and complies with international electromagnetic
Everything You Need to Know About QSFP28 Breakout Cable Solutions
Learn all about QSFP28 breakout cable solutions including compatibility with MSA compliant devices like Cisco,
A New Generation of 100G Pluggable Optics Starts with QSFP28
Learn how to future-proof your investment as the optics industry transitions to new 100G pluggable form factors. The
100G QSFP28
SPQ-CE-LR-IDFF Form Factor: QSFP28 Data Rate: 103.125 Gb/s Reach: 10 km Application: 100GBASE-LR4 Temperature:
QSFP28-ZR4
Universal QSFP28 MSA package with duplex LC connector Two Wire Serial Interface with Digital Diagnostic Monitoring Complies
100 Gb/s 2km QSFP28 LX4 Transceiver
3.3V power supply RoHS compliant The 100GBASE-LX4 module is a versatile and high-performance optical
Industry''s First 100G ZR QSFP28 for Bi-Directional Application
Coherent announces the industry''s first QSFP28 Dual Laser 100G ZR solution that enables broadband providers to
QPhotonics, Laser diode online store
These laser diodes are rugged and reliable, which allows me to use them in state-of-the-art research experiments as well as
Cisco QSFP28 100G ZR Digital Coherent Optics Module
Product overview The Cisco QSFP28 100G ZR module expands the portfolio of digital coherent optics (DCO) modules to connect
Overview of QSFP28 LR4 Optical Transceiver
In our previous post, we provided an in-depth analysis of the 100G LR4 transceiver. Now, we will introduce the
Coherent: Dual Laser 100G ZR QSFP28-DCO Transceiver
Coherent''s Dual Laser 100G ZR QSFP28-DCO incorporates two full C-band, independently tunable lasers, one for the transmit side
QSFP, QSFP+, and QSFP28: What You Need to Know About the
If you''re looking for the most advanced optical module package on the market, look no further than QSFP. QSFP+ and
DATA SHEET 100G QSFP28 LR4 TRANSCEIVER
00G QSFP28 LR4 TRANSCEIVER DESCRIPTION The 100G QSFP28 LR4 transceiver is designed for use in 100 Gigabit. Ethernet
100GBASE-LR QSFP28 1310nm 10km Transceiver Datasheet | FS
•QSFP28 MSA compliant •Supports 53.125Gbaud •100G Lambda MSA 100G-LR Specification compliant Features QSFP28-LR-100G
QSFP28, SFP28 AND QSFP+ OVERVIEW
GREY QSFP28 TRANSCEIVERS Dist: Typical distance, normally based on dispersion properties.
