100G QSFP28 modules are small footprint optical transceivers that transmit 100 gigabits per second data rates over fiber and copper cabling. These modules are a key part of high-speed networks that allow rapid data transmission that is needed by data centers and service providers.
100G QSFP28 does offer three advances over its predecessor, the QSFP+; more speed, greater port density, and improved power efficiency. The value of these enhancements means network operators can increase amounts of capacity without the additional cost of real estate or energy.
Consider 100G QSFP28 modules as next-generation superhighway data conduits, accommodating the highest levels of traffic through their bandwidth at rapid speeds that benefit the ever-increasing demand for data through cloud computing, artificial intelligence, or real-time applications, allowing for a flexible network medium that increases bandwidth availability. Poised to be the backbone leading towards scalable network bandwidth, next-generation transceiver modules will add essential value to any future-ready infrastructure.

100G QSFP28 Modules For Sale

100G QSFP28 Ecosystem: Explore Specialized Categories and Quickly Find Your Solution

Are you searching for the perfect 100G QSFP28 module but feeling lost in the options? Working through the specialized categories without specific direction can be daunting.
This section will serve as your compass, quickly pointing you to the proper solutions for all your different network requirements, from standard modules to BiDi and WDM modules that save fiber and copper cables. Get on board to find what works best for your high-density network or data center interconnect.

Standard 100G QSFP28 (SR4/LR4/PSM4)

Standard 100G QSFP28 modules such as qsfp-100g-lr4 and qsfp-100g-sr4 are the primary units of data center and campus networks. SR4 modules use short-range multimode fiber and are best used in rack-to-rack applications within data centers. LR4 types can use single-mode fiber to extend ranges up to 10 kilometers or connect facilities typically in larger footprints, like campuses or metropolitan areas. PSM4 modules can be a low-cost option for 4-lane single-mode applications to link it all back at a lower cost, while still allowing the distance of fiber.
These modules have been designed to support high-speed transmission in reliable applications, which have enabled high-density aggregation layers at increased latency. The standardized interfaces of these products, along with high-efficiency connectors and converters, allow it to be easy to scale and deploy. The tradeoff of distance versus cost is reasonable for just about any type of network topology.

Fiber-Saving 100G BiDi QSFP28

The 100G BiDi QSFP28 modules utilize single-fiber bidirectional technology. This means twice the amount of fiber is utilized without running any additional cables. BiDi also differs from dual-fiber modules in that it can transmit and receive over the same fiber simultaneously. Instead of using two fibers for transmit and receive, BiDi uses two different wavelengths for each direction.
This will make BiDi the networking media of choice where fiber is limited or very costly to upgrade or when introduced to an environment that already exists, such as older data rooms or metro networks. BiDi modules are a perfect combination of consistent high data rates, low latency, and can leverage any existing fiber already deployed, resulting in a flexible and sustainable option.

Wavelength Division Multiplexing: 100G CWDM4/DWDM QSFP28

QSFP-100G-CWDM4-S and QSFP-100G-LR-S modules utilize wavelength division multiplexing to enable many channels, each capable of 100G, to work across the same fiber. CWDM4 modules utilize coarse wavelength division multiplexing to transmit metro area distances at a cheaper price, while a DWDM module packs a lot of wavelengths for long-distance, carrier-grade applications.
Whatever approach you choose, you will be improving your efficiency on fiber and providing your network with the opportunity to be future-scalable without installing additional fiber. WDM modules will enable channel expansion designed precisely for exploding cloud data traffic or multiple far-flung data centers.
Check out some 100G CWDM QSFP28 modules and DWDM QSFP28 modules to maximize your fiber capacity and ensure you have a better path forward for your network infrastructure.

Copper Direct Attach: 100G QSFP28 DAC/AOC

100G QSFP28 DAC and AOC interconnect modules typically deploy copper or optical cables to connect servers and switches within a rack or between adjacent racks. These high-performance (low-latency) interconnects, through DAC technology, provide the lowest cost for a short-distance connection; AOC technology provides proximity and flexible optical distance connection options per application for high-speed, low-latency connections.
100G DAC and 100G AOC modules standardize interconnects between servers, require less power, and reduce complexity over fiber by eliminating patch panels and distributor cabinets. The plug-and-play deployment simplifies and speeds up data center deployments and is designed to handle high-density payloads in constrained space environments and budgets.
Explore our broad selection of 100G QSFP28 DAC and AOC interconnect modules to make the most out of your server and switch interconnections across racks with efficient, low-cost solutions.

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100G QSFP28 Modules Mechanical DimensionsHigh-Level Selection Guide for 100G QSFP28 Modules: Avoid Common Pitfalls

When selecting a QSFP28 100G module, it comes down to recognizing the important requirements for your network. First and foremost is the link distance—you will want to look for SR4 modules if you are running short range, and LR4 or CWDM4 options for long reach distance. Second, consider what type of fiber or cable you operate, even other distance limitations. SR4 runs off multimode fibers, and single-mode fibers support long reach and wavelength multiplexing. DAC and AOC are short-range solutions with similar cost and performance.
Third, budget will definitely play into your decisions. Fixed-wavelength modules will generally be lower cost, while tunable or advanced WDM optics will generally be higher cost. The trade-offs will be future scalability, flexibility, and consistency of alignment regarding fiber optics.
Fourth, how you run your network will also make a difference in the selection process. For example, high-density applications will fit into the compact, low-power installation when using QSFP28 modules. However, more complex topologies could require tunable optics to manage a wavelength lookback for logical addressing.
You can think of 100G QSFP28 selections like planning a highway network: which lane (module) will your travel distance warrant, what vehicle types (cable and fiber) are you deploying, how much do you want to spend, and what future growth, if any, can you reasonably predict? If you also consider compatibility of the QSFP28 with your current hardware, then you won’t run into any expensive integration issues or downtime.
By maintaining the larger picture in your thoughts, you will avoid the typical pitfalls of deploying scalable, efficient 100G networks.

FAQs

What is the difference between QSFP28 and QSFP+ modules?

QSFP28 has twice the data rate of QSFP+ —from 40G to 100G—which is accomplished by enhanced electrical signaling and improved optics, enabling faster speeds and better connection efficiency.

Can I use 100G QSFP28 modules in the 40G QSFP+ ports?

Typically no. The electrical and optical designs are different as a whole. Mixing these typically leads to compatibility and possibly performance issues, like putting the wrong fuel in a car.

How can I check to see if a QSFP28 is compatible?

The best way is to check your equipment vendor’s compatibility list and firmware version. Commands such as show interfaces transceiver on switches will give you information on your modules. Most manufacturers publish a list of confirmed modules, so check to ensure compatibility for this solution.

Future Outlook and Innovations in 100G QSFP28 Technology

The 100G QSFP28 technology roadmap is closely linked to the development of higher speeds in optics like 400G and beyond. With the new PAM4 modulation, these solutions can substantially improve the data rate without necessarily doubling the bandwidth, which is often the case with these advanced steps.
For example:
The tunable optics market is maturing, allowing for greater controllability of wavelength selection, as well as improving provisioning time. This helps reduce the complexity of metro and long-haul networks by enabling a market for on-demand wavelength provisioning and minimizing the redundancy built into hardware.

Optical engineers are pointing to an industry-wide shift—moving on from fixed, single-speed optics to software-driven, disaggregated optical network ecosystems. As one senior optical engineer stated: “The future is going to be about flexible, programmable optical modules which allow for immediate adjustments to evolving network traffic and capacities without having to physically replace modules.”

100G QSFP28 modules will coexist alongside facilities that deploy multi-rate transceivers and integrated photonics for easy deployment of new networks that utilize energy-efficient, scalable, and robust transport. These new technologies are at the beginning of a convergence where operators can implement future-proof infrastructure while accommodating rapid growth in bandwidth-intensive applications.

You can think of this future pathway as an upgrade from fixed rail lines and platforms to flexible transport hubs that can adjust transportation lanes in real time to ensure the smoothest flow of traffic regardless of demand or customer inflow.

This roadmap of experiences is further evidence of why investing in 100G QSFP28 technology is essential for businesses or networks that anticipate a high level of agility and flexibility—otherwise, they may be exposed to infrastructure limitations rather than having control over them.

Function Diagram of 100G QSFP28 Modules

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Understanding how to select the correct 100G QSFP28 module can be instrumental in building an efficient, scalable design that delivers reliable bandwidth, regardless of the application or workflow. As shown in this comparison of solution categories, each has tailored features and benefits to consider based on the environment and specific needs.
Please invest the time and energy to explore all the different types of 100G QSFP28 solutions listed above, or consult experts to develop the right choice to match your processes or business requirements. Start planning sooner rather than later if your infrastructure design will involve 100G QSFP28 technology.