As a promising and ongoing shift in mobile network architecture, 5G Open RAN(Open Radio Access Networks), refers to a disaggregated approach to deploying 5G mobile networks by using open and interoperable protocols and interfaces, which allows for increased flexibility over traditional RAN systems. 5G Open RAN can be implemented with vendor-neutral hardware and software-defined technology based on open interfaces and industry-developed standards.
As a significant phase of the whole 5G Open RAN network transmission, fronthaul largely impacts the quality of transmitted signal and the actual experience of end users. More and more diversified applications appeared and boosted as high-speed development of internet and IoT technology, such unmanned technology, VR, AR, smart city and industry automation, which requires that the 5G optical transmission network construction need to be more refined and targeted.
Most 5G applications require low-latency, making the bandwidth issue issue an important factor. At the same time, as the equipment of this part is usually implemented outdoors, it’s inevitable for them to face diverse challenges from rugged surroundings, which makes the strength and toughness of the transmission solution specifically important.
Current 5G Fronthaul solutions in the industry that meet the high-bandwidth and low-latency requirements include direct fiber, active WDM, passive WDM, semi-active WDM solutions.
For direct fiber transmission, two-fiber bidirectional (with the same optical cable route) and single-fiber bidirectional gray optical modules are deployed between AAUs and DUs. This solution does not require additional transmission devices or extra power consumption, but only fits for short-haul transmission cause no protection or monitoring capabilities equipped and the fiber consumption is high.
In passive WDM scenario, color optical transceivers are settled directly on AAUs and DUs. Multiple AAUs share one fiber for transmission through passive WDM, no need for independent power supplies.
For semi-active WDM, passive colored optical transceivers and multiplexer/demultiplexer units are deployed on the AAU side, and active WDM devices are deployed on the BBU side. One optical fiber can support access of six 25G eCPRI services. No need for power supply at the remote end. This solution saves optical fiber resources, supports automatic service provisioning and protection switching, provides visibility into optical fiber quality, and enables accurate fault locating.
For active WDM, WDM devices are deployed at AAU sites and in DU equipment rooms to carry signals from multiple AAUs in one optical fiber. Multiple AAUs can share one wavelength, and the OTN encapsulation, management, and protection mechanisms are introduced.
This solution saves a large number of fibers and features high reliability, low fiber consumption, and easy O&M. However, power supply sharing between active WDM devices and AAUs must be considered.
The main differences of the four solutions are shown as below.
|Direct Fiber Connection||Passive WDM||Semi-active WDM||Active WDM|
|Performance Monitoring & Management||×||×||√||√|
|Colored Optical Modules Inserted into the AUU||×||√||√||√|
|Network Architecture Cost||Low||Medium||High||Very High|
Where there need Direct Fiber Connection to be deployed, FIBERSTAMP’s HAOC Series plus Grey Optical Transceivers can greatly meet the transmission requirements.
FIBERSTAMP's HAOC series features its robust capacity of dustproof, waterproof and high/low temperature resistance, which make sure its stable running under different severe environments. It supports 10/25/40/100G Ethernet and eCPRI transmission protocol. This series of products includes multi-mode and single-mode, can cover a wide transmission range of 0~10km, meeting various transmission requirements. At the same time, the HAOCs will generate zero insertion loss while using, and the latency is really low, making sure of it low power consumption and high reliability.
FIBERSTAMP offers 25G grey optical modules, including 25G grey SR, 25G grey LR, 25G grey ER and 25G 10 /20/40km grey BiDi. These meet customers' requirements for direct fiber connection in a wide range of scenarios.
To cope with the rapid and widespread construction of base stations, operators opt for colored optical modules, saving costs and commercializing quickly. In addition, based on existing WDM standards, different organizations proposed coarse WDM (CWDM), micro-optic WDM (MWDM), LAN WDM (LWDM), and dense WDM (DWDM) standards.
For scenarios requiring Passive WDM and Semi-active WDM, FIBERSTAMP offers complete 10/25G color optical transceiver portfolio covering all WDM modes of CWDM LWDM MWDM DWDM and long distance of up to 40km(25g) and 80km(10G).
FIBERSTAMP’s color optical transceivers plus SR grey optical transceivers or HAOCs can well fit different transmission needs of active WDM.
Note: if you have any need for the 5G OMUX, please contact our sales for more details.
In terms of quality control, FIBERSTAMP has always been striving for excellence. Relying on the mature CSD triangle quality management system, FIBERSTAMP has realized the closed-loop quality management that the whole process from R&D to customer feedback is tightly interconnected, ensuring that customer complaints can quickly act on the R&D phase and reflected in the end product timely.
At the same time, FIBERSTAMP has a complete reliability test system accumulated for many years, and has superior ability to analyze and improve reliability issues on levels of equipment, module and unit to ensure optimum product reliability.
What's more, FIBERSTAMP's product line has a complete quality certification system, which greatly guarantees product quality in the three dimensions of electromagnetic compatibility, safety regulations and environmental protection.
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