Application of Active Optical Fiber Cable (AOC) in the Industry

With the continuous development of the communication field, the requirements for the rate, bandwidth, distance, and interference of communication transmission continue to increase, and traditional copper cables are gradually unable to meet the demand. Even if the copper cable is processed through better shielding and coating isolation, or signal preprocessing, the transmission speed and signal recognition will be affected due to the lengthening of the distance when the wire is deployed in a long distance. But if the transmission wire is changed to the fiber material, not only the signal quality can be improved, but the transmission distance can also be greatly improved!


In addition, with the development of 8K and 4K audio-visual applications and VR and AR technologies, the requirements for the transmission performance of the existing transmission interfaces are getting higher and higher. High-speed transmission interfaces such as USB 4, Displayport, Thunderbolt, etc., although the transmission performance has been greatly improved, due to the lengthening of the wire distance, the material characteristics of the copper cable are not conducive to long-distance high-speed transmission, and the transmission performance will be greatly reduced!


The same situation has also occurred in the recent trend of ultra-high-definition television from HDTV to UHDTV. When entering the UHDTV process, the biggest challenge for TV products is how to transmit 8K4K high-resolution video through cables. The existing HDMI 2.x transmission interface will inevitably need to be greatly upgraded and improved to carry UHDTV's high-quality video and audio on the cable.


Electronic products' optical fiber transmission interface can further improve the transmission distance, speed, bandwidth, and anti-interference ability.



Video and audio transmission interface has high requirements for extending transmission distance

For audiovisual transmission interfaces such as USB 3.1, Displayport, Thunderbolt, and other audio-visual equipment, the pressure on the development of high-performance transmission interfaces will be much greater than that of products that purely transmit digital file content! As long as the audio-visual equipment is out of sync or delayed in the transmission process, the human eye can easily perceive problems such as image frustration in the viewing experience of the playback process. Therefore, audio-visual products will have a strong demand for the integration of high-speed transmission interfaces brought about by 8K4K UHDTV and the need for fiber optic transmission cables. On the contrary, it is the application of high-efficiency transmission of data. Because the impact level is less obvious, the demand for optical fiberization of copper cables is relatively not so urgent.



Industrial applications have high requirements for use environment and transmission quality

For industrial applications, such as industrial cameras for machine vision, the use environment is much more complicated. For example, the ambient temperature range is wide, the equipment is used on moving parts, electromagnetic interference is large, etc. But low-latency, high-quality real-time machine vision data is also required. On the other hand, for traditional industrial cameras with USB interfaces, limited by the USB protocol, the length of the copper cable is generally not more than 5 meters to ensure a stable USB3.0 5Gbps rate. At this time, the benefits of copper fiber optics are very obvious.


Active Optical Cable (Active Optical Cable) AOC is used at both the transmitting end and the receiving end to convert the original electrical signal transmitted by copper The signal is decoded and converted into an electrical signal. For power supply, copper cables (Active) are still used, so that no additional power supply is needed and it is easier to use. In addition, the interface and application do not need to be changed for the original equipment, which maximizes the protection of the user's investment and reduces the upgrade cost of copper cable optical fiber.



AOC transmission distance is longer

The AOC method can extend the transmission distance by more than 400 meters, but the power supply is restricted. At present, Thunderbolt and USB applications are mainly based on medium-distance transmission application requirements of 25-150 meters. Even if the distance is more than 150 meters, it can also be expanded with the existing long-distance optical fiber transmission scheme. If an additional power supply interface is provided, the transmission distance of the normal optical cable will be the same.


AOC has better bending resistance

AOC can easily achieve bending resistance of more than 10 million times! And because the outer diameter of the cable is thin, the minimum bending radius is also smaller than that of traditional copper cables. In industrial application scenarios, such as machine vision, cables need to be fixed on the drag chain and move back and forth with the workpiece. At this time, the bending resistance also means the durability of the cable. Although the price of active optical fiber cable (AOC) is higher than that of copper cable, the overall cost is actually cheaper than traditional bend-resistant high-flex copper cables, including cable life and replacement and maintenance costs.


AOC has a strong anti-interference ability

The high-speed transmission uses copper cable media, which usually results in EMI/EMC (Electro-Magnetic Interference/Compatibility) problems, as well as ISI (Inter Symbol Interference) interference problems. When designing a physical cable, design solutions such as increasing the diameter of the copper cable, increasing the shielding layer, introducing the Equalizer circuit, and signal compensation must be adopted. This will make the related design of the interface become more complicated, which not only increases the design cost but also increases the circuit complexity of the related interface. If the transmission wire is to extend the transmission distance, the amount of copper in the wire itself must be increased, and the wire must become thicker and heavier. The overall application plan not only increases the cost of interface connectors, related circuits, and cables but also disadvantages the marketing and sales needs of terminal design products.

Because the signal is transmitted by laser, AOC has very little signal attenuation, and it is not susceptible to the above-mentioned various interference problems.


Donghoo Tech Co., Limited was found in 2003, and the Shenzhen branch was found in 2006. We mainly design and produce machine vision cable assemblies: CameraLink cables, Hirose series cables, Analog video cables, USB cable, GigE cables, and other drag chain cable assemblies for industrial application.

Our factory has all devices for Cutting, welding, assembly, inspection, testing, packaging, and transportation.

The company concentrates on the best quality, customer first, high efficiency, and low consumption. Sustainable management is the management idea. With stable quality, good reputation, we got all the customer's praise. We will now always pay attention to product quality and enterprise image to offer better service to win customers' trust.

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