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128G QSFP+
128G QSFP+
C-LIGHT 128G QSFP+ optical transceiver is a high-speed fiber communication transceiver featuring a quad-channel parallel design, with each channel supporting 32Gbps transmission for an aggregate bandwidth of 128Gbps. Hot-swappable and compliant with 100G Ethernet and InfiniBand protocols, it delivers transmission distances up to 100 meters (multimode fiber) or 10 kilometers (single-mode fiber). Ideal for data centers, cloud computing, and HPC environments, its compact QSFP+ form factor enables high-density deployment while offering low power consumption and minimal latency, making it a core component in modern high-speed network infrastructure.
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Product Details
Form Factor Part No. Fiber Type Data Rate Wavelength Distance Connector Case Temperature Note
QSFP+ CL128GQSFPCW4 SMF 128G 1310nm 2km~10km LC Com./Ind.  
QSFP+ CL128GQSFPSR4 MMF 128G 850nm 100m MPO Com./Ind.  

128G QSFP+ Optical Transceiver with 4×32Gbps Parallel Architecture for High-Speed Data Networks

128G QSFP+ Optical Transceiver Overview

C-LIGHT 128G QSFP+ optical transceivers are high-speed parallel optical modules designed to provide an aggregate 128Gbps data rate through four independent 32Gbps channels. The QSFP+ form factor combines high bandwidth with a compact footprint, making the modules suitable for high-density optical networking environments.

The product family includes both multimode and single-mode configurations. The 850nm multimode version supports up to 100m using an MPO connector, while the 1310nm single-mode version supports 2km to 10km transmission through an LC interface. These configurations allow the 128G QSFP+ platform to address different optical link requirements in data center and high-performance computing environments.

128G QSFP+ Optical Transceiver Key Features

128Gbps Aggregate Bandwidth

The module combines four 32Gbps optical channels to provide a total data rate of 128Gbps for high-bandwidth network connections.

Four-Channel Parallel Architecture

Four parallel optical lanes distribute the overall bandwidth across multiple channels, forming the core architecture of the 128G QSFP+ design.

QSFP+ Form Factor

The compact QSFP+ package supports high-density installation in compatible networking equipment while maintaining a high aggregate optical capacity.

MMF Short-Reach Configuration

The 850nm multimode version is designed for transmission up to 100m and uses an MPO optical connector for parallel fiber connectivity.

SMF Extended-Reach Configuration

The 1310nm single-mode version supports transmission from 2km to 10km and uses an LC connector for extended optical links.

100G Ethernet and InfiniBand

The product is specified for high-speed networking environments involving 100G Ethernet and InfiniBand applications.

Low-Latency Network Connectivity

The parallel optical architecture is suited to applications where high bandwidth, low latency, and efficient optical interconnection are important.

Commercial and Industrial Temperature Options

The listed configurations are available with commercial and industrial case-temperature options for different deployment environments.

128G QSFP+ Optical Transceiver Applications

High-Performance Computing

The high aggregate bandwidth and parallel optical architecture make the module suitable for HPC systems requiring fast interconnection between computing resources.

Data Center Networks

The compact QSFP+ package provides high-density optical connectivity for compatible data center switching and interconnection equipment.

InfiniBand Infrastructure

The 128G optical platform can be deployed in compatible InfiniBand environments where high-throughput, low-latency connectivity is required.

100G Ethernet Systems

The module supports optical connectivity for compatible 100G Ethernet environments and high-speed network architectures.

Cloud Computing Infrastructure

High-bandwidth optical interconnects can support communication between servers, switches, and computing resources in cloud data center environments.

Short-Reach Rack Interconnects

The 100m multimode configuration is suitable for short optical connections within data center and computing environments.

Extended Data Center Links

The 2km to 10km single-mode configuration provides an option for longer connections between network locations and facilities.

High-Density Network Upgrades

The QSFP+ form factor allows network operators to increase aggregate optical bandwidth without requiring a large physical footprint.

Why Choose C-LIGHT 128G QSFP+ Optical Transceiver?

Four-Lane 32G Architecture

The 128G implementation is built around four 32Gbps channels, providing a clear parallel architecture for achieving the aggregate bandwidth.

Two Distinct Fiber Solutions

C-LIGHT provides both 850nm MMF and 1310nm SMF versions, allowing the module to be selected according to link distance and installed fiber infrastructure.

Different Connector Choices

The short-reach multimode configuration uses MPO, while the single-mode extended-reach configuration uses LC, matching the requirements of their respective optical architectures.

High-Density QSFP+ Design

The compact form factor makes it possible to deploy high aggregate optical capacity in equipment where front-panel space and port density are important considerations.

Quality-Controlled Manufacturing

C-LIGHT states that 100% of products pass initial testing, final testing, and factory inspection as part of its quality-control process.

Technical and Customized Support

C-LIGHT provides technical support, compatibility testing, and customized optical solutions for different network deployment requirements.

128G QSFP+ Optical Transceiver FAQ

Q1. What is a 128G QSFP+ optical transceiver?

A 128G QSFP+ optical transceiver is a high-speed parallel optical module that combines four 32Gbps channels to provide an aggregate data rate of 128Gbps.

Q2. How is the 128G bandwidth achieved?

The module uses four parallel optical channels, with each channel operating at 32Gbps, resulting in a combined 128Gbps data rate.

Q3. What transmission distances are available?

C-LIGHT provides a 100m multimode configuration and a single-mode configuration supporting 2km to 10km transmission.

Q4. What fiber types are supported?

The product family supports both multimode fiber and single-mode fiber. The MMF version uses 850nm optics, while the SMF version uses 1310nm optics.

Q5. Which connectors are used?

The 100m multimode version uses an MPO connector, while the 2km to 10km single-mode version uses an LC connector.

Q6. What applications does the 128G QSFP+ support?

The product is designed for high-speed networking environments including data centers, cloud computing, high-performance computing, 100G Ethernet, and InfiniBand applications.

Q7. Is the 128G QSFP+ hot-swappable?

Yes. C-LIGHT describes the 128G QSFP+ as a hot-swappable optical transceiver for compatible network equipment.

128G QSFP+ Optical Transceiver Solution Summary

C-LIGHT 128G QSFP+ optical transceivers combine four 32Gbps parallel channels with a compact QSFP+ package to deliver 128Gbps aggregate bandwidth. With an 850nm MPO-based MMF option for 100m links and a 1310nm LC-based SMF option for 2km to 10km transmission, the product family provides differentiated optical configurations for data centers, cloud computing, HPC, 100G Ethernet, and InfiniBand environments.

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Quality inspection

●100% of products pass initial test, final test and factory inspection.

●3-step quality control management process.

●100% complete implementation of customer order quality requirements.

●100% guarantee of customer product data information security.




Quality certification

Please contact us to download the certification certificate.

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Please Note: Installing a third party transceiver does not void your network equipment warranty. Network equipment manufacturers all have guidelines stating that warranty support on their products will not be affected.

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Contact C-LIGHT for optical transceiver technical support,
compatibility testing and customized solutions.

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Phone:+86 132 6656 7067
Email : sales@c-light.com

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