What is the difference between AOC and DAC cables in data centers?

The primary difference lies in the transmission medium and distance. DAC (Direct Attach Copper) uses copper wires and is limited to short distances (up to 5-7m), while AOC (Active Optical Cable) uses fiber optics to reach up to 100m. AOCs are significantly lighter, thinner, and offer better bend radius. More importantly, AOCs are immune to Electromagnetic Interference (EMI), making them the preferred choice for high-density AI clusters and leaf-spine architectures where signal integrity is critical.

Does Active Electrical Cable (AEC) replace the Optical Transceiver or AOC?

Active Electrical Cables (AEC) do not fully replace optical transceivers or Active Optical Cables (AOC), but they serve as a middle-ground solution. While AECs use copper to reach distances up to 7m with retiming capabilities, AOCs remain superior for lengths up to 100m due to their fiber-optic core, which offers lighter weight, better bend radius, and complete immunity to Electromagnetic Interference (EMI) in high-density AI clusters.

What is a USB Active Optical Cable and where is it used?

A USB Active Optical Cable (such as USB 3.0/3.1 AOC) utilizes fiber optics to extend USB signals far beyond the 3-meter limit of standard copper cables, reaching up to 50m-100m. These are widely used in Pro-AV, medical imaging, and industrial machine vision, where high-speed data must be transmitted over long distances without signal degradation or interference.

When should I choose a 25G SFP28 Active Optical Cable over a DAC cable?

You should opt for a 25G SFP28 Active Optical Cable (AOC) when your link distance exceeds 5 meters or when rack airflow is a concern. Unlike 25G DACs, which are thick and rigid, the SFP28 AOC is thin and flexible, significantly improving cable management and airflow in high-density server racks. Additionally, AOCs provide a more stable bit error rate (BER) over longer distances than passive copper.

Are breakout AOC cables like 100G-to-4x25G compatible with all switches?

Compatibility depends on the switch hardware and its port configuration. A 100G QSFP28 to 4x25G SFP28 breakout AOC requires the host switch to support port splitting or breakout mode. At Unitekfiber, we solve common compatibility hurdles by offering multi-vendor EEPROM coding. This ensures that the 100G end is recognized as a standard QSFP28 (e.g., Cisco compatible) and the 25G ends are recognized by their respective server NICs (e.g., Intel or Mellanox compatible) without any unsupported transceiver errors.

Wholesale Active Optical Cables (AOC) | 25G, 40G, 100G & 400G Solutions

Q: What are the benefits of using a 100G QSFP28 Active Optical Cable in data centers?

A 100G QSFP28 Active Optical Cable is a factory-integrated assembly that replaces two 100G transceivers and a fiber patch cord. The primary benefits include higher reliability (no exposed optical connectors to clean), lower power consumption (often <2.5W per end), and lower latency. It is the most cost-effective solution for short-reach (up to 70m-100m) Leaf-Spine interconnections.

Q: Are 10G SFP+ and 40G QSFP+ Active Optical Cables backward compatible?

10G SFP+ Active Optical Cables are generally dedicated to 10G ports. For 40G QSFP+ Active Optical Cables, they are primarily designed for 40G-to-40G links. However, Unitekfiber also provides 40G QSFP+ to 4x10G SFP+ breakout AOCs, which allow a single 40G port to connect to four 10G ports, effectively facilitating bandwidth migration in legacy-to-modern network upgrades.

Q: Why is the QSFP28 Active Optical Cable popular for InfiniBand and AI networks?

In AI supercomputing and InfiniBand EDR environments, low latency and massive throughput are mandatory. The QSFP28 Active Optical Cable provides a stable 100Gbps link with integrated optics that minimize the signal jitter often found in modular transceiver-and-jumper setups. At Unitekfiber, our QSFP28 AOCs are tested for 100% compatibility with high-performance NICs (like Mellanox) to ensure zero-packet-loss performance.

Q: Can a 100G QSFP28 Active Optical Cable replace two transceivers and a patch cord?

Yes. A 100G QSFP28 Active Optical Cable is a factory-integrated assembly that functions as a permanent link between two ports. By eliminating the need for separate 100G QSFP28 transceivers and a fiber patch cord, you remove the risk of optical port con

High-Speed Active Optical Cables (AOC): 25G to 400G Connectivity Solutions

Active Optical Cable (AOC) is an integrated fiber-optic assembly that combines high-speed transceivers with fixed optical cabling. Designed for AI supercomputing, InfiniBand, and Data Center Interconnect (DCI) scenarios, AOCs eliminate the risk of optical port contamination and signal loss associated with traditional patch cords. Unitekfiber, a premier AOC manufacturer, offers customized 25G, 40G, 100G and 400G AOC solutions, providing a low-latency, "plug-and-play" alternative to discrete transceiver-and-jumper combinations.

Products

Solutions

Types of Active Optical Cable (AOC)

Active Optical Cable|High Speed AOC Cable 100G QSFP28 Optic Transceiver Module OM3

Active Optical Cable|High Speed AOC Cable 40G QSFP+ Optic Transceiver Module OM3

AOC 40G QSFP+ to QSFP+ Fiber Active Optical Cable OM2 3M

AOC Active Optical Cable 40G QSFP to-4 x 10G SFP+ Breakout AOC Cable 5M

Active Optical Cable AOC 40G QSFP to 4x10G SFP+ AOC Breakout Transceiver 10m

AOC 100G QSFP28 to QSFP28 Active Optical Cable OM3 5M

10G AOC SFP+ Active Optical Cable OM3 Wavelength 850nm 1m-5m

25G SFP28 AOC Active Optical Cable OM3 3mts 25G AOC Cable for 5G Database

What is Active Optical Cable(AOC)?

Active optical cable (AOC) can be defined as an optical fiber jumper cable terminated with optical transceivers on both ends. Unlike traditional copper cables, which rely on electrical signals for data transmission, AOC cable utilize optical fibers to transmit data using light signals. These optical fibers are integrated into the optical cable assembly along with active components such as laser diodes, photodiodes, and control circuitry. The active components convert electrical signals into optical signals for transmission and then back to electrical signals at the receiving end. AOC is designed to provide a reliable and efficient solution for high-bandwidth connectivity in various applications, including data centers, networking infrastructure, and consumer electronics.

Why AOC is the Preferred Choice for AI & Data Center Interconnects

In the era of massive data throughput, AOC fiber cables have become the mainstream application for short-reach high-density cabling. By factory-terminating the optical modules directly onto the fiber, Unitekfiber ensures superior signal integrity and EMI immunity.

Our Comprehensive AOC Cable Portfolio:

·High-Speed Trunk AOCs: Available in 25G SFP28, 40G QSFP+, and 100G QSFP28 for point-to-point server-to-switch links.

·Breakout AOC Solutions: Specialized 40G to 4×10G and 100G to 4×25G breakout cables, ideal for high-density port migration and bandwidth distribution.

·Customized Lengths & Compatibility: We provide tailored lengths and multi-vendor EEPROM coding (Cisco, Arista, Mellanox compatible) to fit your specific rack architecture.

What are the Types of AOC Cable?

AOC active optical cable comes in various form factors, such as SFP+, SFP28, QSFP+, QSFP28 and HDMI. UnitekFiber offers a series of customized AOC cable, such as AOC trunk cable, and Breakout AOC cable. These form factors cater to different connectivity requirements and are widely used in applications such as high-speed data networking, storage area networks (SANs), video streaming, and computer-to-monitor connections.

Learn more about the AOC Vs DAC Cable

AOC_Optical_Cable(AOC).jpg

What are the Advantages of AOC Cable?

Traditional data center interconnection is mainly based on coaxial cables. AOC fiber cables have many significant advantages over interconnected copper cables. For example, the transmission power on the system link is lower, the weight is only a quarter of the directly connected copper cable, the volume is about half that of the copper cable, and it has better air flow and heat dissipation in the wiring system of the computer room. The fold radius is smaller than that of copper cables, and the transmission distance is longer (100 to 300 meters). The bit error rate of the product transmission performance is also better. Compared with the optical transceiver module, the AOC active optical cable has no exposed optical interface, does not need to consider the problems of pollution on the optical interface. Thus, it greatly improves system stability and reliability, and reduces maintenance costs in the equipment room.

Typical Applications & Recommended Solutions

Active Optical Cables (AOCs) are widely deployed in high-bandwidth, low-latency network environments where reliability, simplified installation, and superior signal integrity are essential. As modern data centers migrate toward 100G, 200G, 400G, and AI-driven network architectures, AOC solutions have become a preferred choice for short- to medium-reach interconnects between servers, switches, storage systems, and GPU clusters.

If you are designing a modern data center or cloud infrastructure, explore our Data Center & Cloud Interconnect Solution to learn how AOC cables, optical transceivers, MPO/MTP cabling, and high-density patch panels work together to build scalable network architectures.

For AI computing, HPC clusters, and InfiniBand networking, our 400G DR4 InfiniBand Optical Transceivers guide explains how high-speed optical connectivity enables ultra-low latency communication between GPU servers and spine switches while supporting future 800G network migration.

If you are comparing different optical connectivity options, our Top 10 Optical Transceiver Types for WDM & High-Capacity Networks provides an overview of SFP, SFP28, QSFP+, QSFP28, QSFP-DD, CWDM, DWDM, and other optical module technologies to help you select the most suitable solution for your network.

For engineers evaluating transmission media, you may also find our Applications of AOC Cables and DAC Cables in Data Centers, helpful for understanding when to deploy AOC instead of DAC across different data center layers, including Top-of-Rack (ToR), Leaf-Spine, and Data Center Interconnect (DCI) architectures.

Learn more about the application of AOC cable

Recommended Products for AOC Deployment

Active Optical Cables are commonly deployed together with high-speed optical transceivers, MPO/MTP fiber patch cables, fiber patch panels, and Direct Attach Copper (DAC) cables to build flexible and scalable network infrastructures. Depending on the transmission distance and application scenario, these products can be combined to optimize bandwidth, simplify cable management, and reduce deployment costs.

Explore our complete portfolio of 100G Optical Transceivers, 400G Optical Transceivers, MTP/MPO Fiber Patch Cables, Direct Attach Copper (DAC) Cables, and MPO/MTP Patch Panels to build a complete high-speed connectivity solution for AI data centers, cloud computing platforms, and enterprise networks.

UnitekFiber is a trusted and reputable supplier specializing in providing a wide range of active optical cable aoc wholesale for various networking and data communication applications. Whether you require AOC cable, DAC cable or transceiver module for data center, UnitekFiber has got you covered. For any inquiries or further information, please don't hesitate to reach out to us at sales@unitekfiber.com.

Download Catalog of AOC Cable