Overview of QSFP28 LR4 Optical Transceiver

There is no denying that the 100G data center optics market is rapidly expanding, leading to increased demand for 100G optical transceivers. Among the various 100G modules available, the QSFP28 optical transceiver stands out as the preferred choice due to its compact size and low power consumption. In our previous post, we provided an in-depth analysis of the 100G LR4 transceiver. Now, we will introduce the QSFP28 100G LR4 optical transceiver module, covering its definition, working principle, specifications, applications, and FAQs.

QSFP28 LR4 Introduction

What Is LR4?

The QSFP28 LR4 is a hot-pluggable, four-channel, and full-duplex optical transceiver module designed for long-distance transmission up to 10 km in the 100G Ethernet network with a working bandwidth of 1295nm to 1310nm. It provides an ideal solution for large-scale data centers for high-demand transmission distances. Simultaneously, the QSFP 100G LR4 modules are fully compliant with the IEEE 802.3ba standard.

How Does QSFP28 LR4 Work?

The QSFP28 100G LR4 optical module converts four 25Gbps electrical signals into four LAN WDM optical signals and then multiplexes them into a single channel for 100G optical transmission. At the receiving end, the module reuses 100G light input demultiplexing into four LAN WDM optical signals and then converts them into four electrical channel signal output channels.

QSFP28 SR4 Module Working Principle

FS QSFP28 LR4 Specification and Benefits

All FS 100G LR4 optical transceiver modules are manufactured to satisfy the industry standard and have been recognized by numerous customers. They are proven to be compatible with over 200 vendors, such as Cisco, Juniper, Arista, Brocade, Dell, and so on. Also, they are fully compliant with the QSFP28 MSA, IEEE 802.3ba 100GBASE LR4, and IEEE 802.3bm CAUI-4 standard.

QSFP28 LR4 Specification

The QSFP28 LR4 module provides 100GBase-LR4 throughput up to 10km over a standard pair of single mode fiber (SMF) with duplex LC connectors. This transceiver is compliant with IEEE 802.3 100GBASE-LR4, SFF-8665 and SFF-8636 standards. Digital diagnostics functions are also available via the I2C interface, as specified by the QSFP28 MSA, to allow access to real-time operating parameters. With these features, this easy to install, hot swappable transceiver is suitable to be used in various applications, such as 100G telecom connections, data center, high-performance computing networks, enterprise core and distribution layers, campus networks etc.

100G QSFP28 SR4 Module

Form Type	QSFP28
Wavelength	1310nm*
Connector	Duplex LC
Media	SMF
Max Data Rate	103.125Gbps (4x 25.78Gbps)
Max Cable Distance	10km
TX Power	-4.3~4.5dBm
Minimum Receiver Power	＜-10.6dBm
Transmitter Type	4 x LAN WDM EML
DDM/DOM	Supported
Commercial Temperature Range	0℃ to 70℃ (32 to 158°F)
Protocols	IEEE 802.3 100GBASE-LR4, QSFP28 MSA, SFF-8665, SFF-8636

*Range: L0 1295.56nm(1294.53-1296.59nm); L1 1300.05nm(1299.02-1301.09nm); L2 1304.58nm(1303.54-1305.63nm); L3 1309.14nm(1308.09-1310.09nm)

QSFP28 LR4 Benefits

FS's QSFP28 LR4 module, with its exceptional performance, low power consumption, and seamless compatibility, offers a reliable and scalable network solution for high-speed, long-distance data transmission.

Real-Device Testing, Perfect Quality

FS LR4 optical modules undergo comprehensive real-device testing in our professional lab to ensure perfect compatibility with devices from brands like Cisco, Arista, and Juniper. This rigorous testing process guarantees not only stable performance but also original quality, ensuring the modules meet the highest industry standards for reliability and seamless integration into diverse network environment

Comprehensive Testing Increases Reliability

BOX Airtight Packaging for Enhanced Reliability Equipped with a Semtech chip and BOX airtight packaging, the QSFP28 LR4 transceiver ensures high speed, low power consumption, and long-term reliability by protecting components from environmental factors, maintaining stable performance even in challenging conditions.

Leading Performance and Quality for 100G

Flexible Network Adaptation and Cost Optimization

With FS BOX, FS optical modules can be reprogrammed in real-time to work with different brands of equipment, ensuring seamless connectivity. This technology not only improves the compatibility and flexibility of the transceivers but also helps optimize inventory management, reducing stock costs and providing more efficient network solutions.

Enable Seamless Connectivity for Your Network

Flexible Connectivity and Wide Application

The FS 100G LR4 module, featuring an LC duplex connector, supports up to 10km transmission on single-mode fiber (LR4 fiber). It's ideal for data centers, enterprise networks, and large-scale high-performance setups. Supporting both 100G Ethernet and 100G EDR InfiniBand, it ensures flexible interconnection, fast deployment, and efficient long-distance transmission with excellent scalability.

FS QSFP28 LR4 Implementation and Applications

QSFP28 LR4 Application Scenarios

Data Center Interconnections: The 100GBASE LR4 transceiver is ideal for long-distance connections between data centers, providing high-speed, high-capacity data transmission over single-mode fiber. With a transmission distance of up to 10 kilometers, it meets the needs of large-scale data center interconnections, ensuring reliable, long-range communication.

Enterprise Networks: In enterprise networks, the QSFP28 100G LR4 is widely used to link core switches and edge devices over long distances, enabling efficient and stable communication across extended network infrastructures, such as interconnecting remote offices or large enterprise buildings.

Long-Distance Connectivity: The 100GBASE LR4 is an excellent solution for extending high-speed connectivity across metropolitan area networks (MANs) and wide area networks (WANs), ensuring smooth data transmission over long distances with minimal signal degradation, making it ideal for telecommunication providers and service providers.

Cloud and High-Performance Computing: With its high bandwidth and low latency, the 100G LR4 is a perfect fit for cloud computing, big data analytics, and high-performance computing (HPC) environments, where massive amounts of data need to be transferred quickly and efficiently over long distances.

Flexible and Scalable Networking: The QSFP 100G LR4 is ideal for networks that require flexible, high-performance solutions. Its long-distance capabilities make it suitable for large-scale, geographically distributed networks that demand both scalability and reliable long-range transmission.

FS offers not only the 100g LR4 but also a wide range of high-performance 100G optical modules. With perfect compatibility, low power consumption, and rigorous testing, FS provides reliable and cost-effective solutions for diverse network needs.

QSFP28 LR4: Cabling and Connectivity

Enterprises and data centers are transitioning from 10Gb/s and 40Gb/s networks to 100Gb/s connectivity. The 100G LR4 is often the ideal choice for long-distance 100G direct connections and interconnections.

100G to 100G Direct Connection

Achieving a direct 100G connection is similar to the process for 10G/40G. Simply insert two QSFP28 100G LR4 modules into the corresponding ports on the switches, and then connect them with LC fiber optic cables.

QSFP28 LR4 Module 100G-100G Direct Connection

100G-100G Interconnect Cabling Solution with Rack Mount Fiber Enclosure

As shown in the diagram, high-density QSFP 100G LR4 interconnect cabling can be accomplished using rack mount fiber enclosures, MTP fiber adapter panels, and MTP trunk cables. This solution utilizes fiber enclosures and adapter panels to ensure structured cable management for efficient, scalable connectivity.

By simplifying the setup and offering flexible, high-density solutions, the QSFP28 100G LR4 ensures seamless, high-performance interconnection in large-scale network environments.

QSFP28 LR4 Module 100G-100G Interconnection

QSFP28 LR4 FAQs

Q1: Will the QSFP 100G LR4 work if connected to a CFP 100G LR4 on the other end?

A: Yes, the QSFP 100G LR4 and CFP 100G LR4 modules are featured with the same 100G transmission rate and are working on the same wavelength (1310nm), so the QSFP 100G LR4 will work if connected to a CFP 100G LR4 module.

Q2: Is it necessary to clean a transceiver's optical connector? How to clean the QSFP28 LR4 100G transceiver?

A: Yes, dust and contaminants can accumulate on the transceiver's optical connectors, causing issues like reduced optical launch power. To ensure optimal performance, FS strongly recommends cleaning both connectors each time they are disconnected and reconnected. The FS One-Push Fiber Optic Pen Cleaner (designed for 1.25mm LC/MU connectors) is the best choice for cleaning the 100GBASE LR4 QSFP28 modules.

Q3: Will using the compatible QSFP 100G LR4 optics in my equipment negatively affect my manufacturer’s warranty?

A: No, using compatible third-party optics does not void your manufacturer's warranty. If a product defect occurs that is unrelated to the use of third-party optics, the manufacturer will still honor the warranty and provide support.

Q4: If I order the QSFP 100G LR4 module, will it work on the 1310 channel of your 18 Channels 1270-1610nm CWDM Mux Demux or will the MUX require a separate 1310 channel?

A: Please note that the QSFP 100G LR4 1310nm module will not work on the 1310nm channel of the 18 Channels 1270-1610nm CWDM Mux Demux. The Mux requires a separate 1310nm channel. For the 1310 channel, the following wavelengths cannot be used: 1270/1290/1310/1330/1350/1370nm.

Q5: Do FS QSFP28 100G LR4 modules support customized service?

A: Yes, all FS QSFP28 100G LR4 transceivers are provided with customized service. All you need to do is to provide your compatible brands and model types for us. We appreciate any inquiry about customized products and solutions for your specific preferences and requirements.