Tag Archives: Active optical cable

Do You Know about Active Optical Cable (AOC Cable)?


Bandwidth usage is soaring, driven by the proliferation of Internet-connected devices. At this time, active optical cable (AOC cable) has emerged. Besides, the market of AOC cables keeps growing and has a broad prospect. What’s active optical cables? Why should we use it? In this article, some knowledge of active optical cables will be provided.

Introduction to Active Optical Cable (AOC Cable)
Active optical cable (AOC) is used for short-range multi-lane data communication and interconnect applications. Usually, the wire transmission of optical communication should belong to passive part, but AOC is an exception. AOC consist of multimode optical fiber, fiber optic transceivers, control chip and modules. It uses electrical-to-optical conversion on the cable ends to improve speed and distance performance of the cable without sacrificing compatibility with standard electrical interfaces. Since people expect more information to be available at their fingertips, our communications systems will need to be quicker, and AOC is one of the best solutions to solve this problem. Compared with direct attach copper cable for data transmission, AOC provides more advantages, such as lighter weight, high performance, low power consumption, low interconnection loss, EMI immunity and flexibility. At present, AOC is widely used in many fields as well as promoting the traditional data center to step into optical interconnection.

AOC cable

Differences Between Passive/Active DAC and Active Optical Cable (AOC Cable)
Passive cabling provides a direct electrical connection between corresponding cable ends. Active cables provide the same effect but, by embedding optics and/or electronics within the connectors, can overcome some of the limitations of passive cables. While passive cables are always copper-based, active cables can use either copper wire or fiber optics to provide the link between the cable ends. The picture below shows us the leading types of passive and active cables for data center.

Differences Between PassiveActive Copper and Active Fiber

 Why Use Active Optical Cable (AOC Cable)?
Primarily, active optical cable (AOC) assemblies were invented to replace copper technology in data centers and high performance computing (HPC) applications. As we know, copper passive twinax cable is heavy and bulky, making it difficult to physically manage the datacenter. And due to the nature of electrical signals, electromagnetic interference (EMI) limits copper’s performance and reliability. Though there are so many disadvantages of copper cable, at that time, it is the main stream while the idea of AOC cables almost seems too good to be true. However, the advantages of AOC cables make the predecessors look obsolete and unsophisticated, and changes the limitation of copper passive twinax cable as well as playing an important role in high speed data transmission. Nowadays, a variety of active optical cable have been launched in the market, such as 10G SFP+ AOCs, 40G QSFP+ to QSFP+ AOCs, 40G QSFP+ to 4 SFP+ breakout AOCs and ,40G QSFP+ to 8xLC breakout AOCs.

Active Optical Cable

FS.COM active optical cables achieve high data rates over long reaches which are the best solutions for high-performance computing and storage applications. We provide many AOC products such as 10G SFP+ AOCs, 40G QSFP+ AOCs, QSFP+ to 4 SFP+ AOCs, and QSFP+ to 8 x LC AOCs. In addition, customized active optical cables are available in various lengths, Cisco compatible and other options. For more detailed information, please visit www.fs.com or contact us over sales@fs.com.

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QSFP+ and QSFP28 Transceivers Cabling Solutions

40G Network Connectivity Solutions

Active Optical Cable (AOC) – Rising Star of Telecommunications

40G Network Connectivity Solutions


High speed and wide bandwidth demands drive data centers to consolidate into more complex systems. The speed of data center now is increasing to 40G and eventually to 100G. How to achieve 40G connectivity? In fact, we need some new optical technologies and cabling infrastructure. In this post, I will introduce some commonly used qsfp and qsfp cable for 40G connectivity.

40G QSFP Modules
As we know, fiber optic transceiver is an electronic device that receives an electrical signal, converts it into a light signal, and launches the signal into a fiber. It also receives the light signal, from another transceiver, and converts it into an electrical signal. It is the key component in fiber optic transmission. The basic interface of 40G pluggable optical modules are 40GBASE-LR4 and 40GBASE-SR4 in QSFP+ form factor.


40GBASE-SR4 transceivers are used in data centers to interconnect two Ethernet switches with 8 fiber parallel multimode fiber OM3/OM4 cables. It can support the transmission distance up to 100 m with OM3 fiber and 150 m with OM4 fiber. The optical interface of 40GBASE-SR4 is MPO/MTP. This module can be used for native 40G optical links or in a 4x10G mode with parallel to duplex fiber breakout cables for connectivity to four 10GBASE-SR interfaces.

40GBASE-LR4 QSFP+ transceiver support with a link length up to 10 kilometers over 1310 nm single-mode fiber with duplex LC connectors. The 40 Gigabit Ethernet signal is carried over four wavelengths. Multiplexing and demultiplexing of the four wavelengths are managed within the device. It is most commonly deployed between data-center or IXP sites with single-mode fiber.

QSFP+ Cables
QSFP+ cable is designed to meet emerging data center and high performance computing application needs for a short distance and high density cabling interconnect system capable of delivering an aggregate data bandwidth of 40Gb/s. QSFP+ cables are suitable for very short distances and offer a highly cost-effective way to establish a 40G link between two switches within racks and across adjacent racks. These high speed cables provide a highly cost-effective way to upgrade from 10G to 40G or 40G to 40G interconnect connection.

1. Passive and Active Direct Attach Copper Cables
The 40g passive or active direct attach copper cables (DAC) are designed with twinax copper cable and terminated with QSFP+ connectors. The main difference between passive DAC and active DAC is that the passive one is without the active component. Therefore, active QSFP+ DAC can achieve a longer transmission distances than passive QSFP+ cable.


2. Active Optical Cable (AOC cable) Assemblies
Active optical cable, namely AOC brings a more flexible cabling than direct attach copper cables with the advantages of lighter weigth, longer transmission distance and higher performance for anti-EMI. Now, 40G AOC cable are popular with users.


MPO/MTP Cable Series
Since 40GBASE-SR4 and 40GBASE-CSR4 both use MPO/MTP connector. Therefore, in addition to fiber optic transceivers and direct attach cables, MTP cabling series usually needed to achieve 40G connectivity. This series include MTP trunk cables, MTP-LC harness/breakout cables, LC or MTP patch cables, MTP-LC cassette modules, MTP adapter panels and MTP rack mount holders.

MPOMTP Cabling Series

Fiberstore offers a comprehensive solution for 40G network connectivity. What’s more, products such as 40GBASE-LR4 and 40GBASE-SR4 modules are in stock and can shipped in 12hrs. For more information, please visit www.fs.com.

Related article: Do You Know about Active Optical Cable (AOC Cable)