ISO and TIA standardization organizations released the latest wiring standards ISO 11801 3rd and TIA-568.0-D respectively in 2017. The new standard removes the traditional OM1, OM2 multimode optical cables and adds OM5 broadband multimode optical cables. ISO reduces the attenuation of OM5 optical cable from 3.5 dB / km of the previous OM3 and OM4 optical cables to 3.0 dB / km, and additionally increases the bandwidth requirement at the wavelength of 953nm. The new project of ISO / IEC JTC1SC25 WG3, ISO / IEC TR 11801-9908, has released the first draft of WD, which aims to study the wiring guideline specification for transmission of high-speed network applications on multimode fiber. The specification is for 10/40/100/200 / The transmission distance of OM3, OM4, OM5 multimode optical fiber under 400G duplex and parallel network application was studied.
OM5 multimode fiber supports more wavelength channels, so the development direction is the same for the four-wavelength SWDM4 or dual-wavelength BiDi technology. Similar to BiDi for 40G links, SWDM transceivers only require two-core LC duplex connection, the difference is that each SWDM fiber operates at 4 different wavelengths between 850nm and 940nm, one of which is dedicated to To transmit signals, another fiber is dedicated to receiving signals.
OM5 fiber also supports future 400G Ethernet. For higher speed 400G Ethernet applications such as 400G Base-SR4.2 (4 pairs of fiber 2 wavelengths, each channel uses 50G PAM4) or 400G Base-SR4.4 ((4 For 4 wavelengths of optical fiber, each channel uses 25GNRZ), only 8-core OM5 optical fiber is required. Compared with the first generation 400G Ethernet 400G Base-SR16 (16 pairs of optical fibers, each channel transmits 25Gbps), the number of optical fibers required is As a quarter of traditional Ethernet, SR16 is a milestone in the development of multi-mode 400G technology, proving the possibility of multi-mode technology supporting 400G. In the future, 400G large-scale application market is more looking forward to 400 multi-mode applications based on 8-core MPO.
Optical fiber is used as the physical transmission medium for data communication to provide support for network equipment. The promotion of OM5 fiber is inseparable from the support of network equipment manufacturers. There are two technologies on the market that use a small amount of fiber to transmit high-speed networks: BiDi and SWDM4. From the perspective of the industry chain, OM5 multimode fiber and BiDi and SWDM4 equipment manufacturers have formed an industry alliance, but the maturity of this ecosystem depends on the shipment of these 40 / 100G network equipment and the massive deployment of OM5 fiber. OM5 multimode fiber testing is exactly the same as the traditional OM3, OM4 multimode fiber testing equipment and test procedures, users do not need to purchase additional test equipment.
The data center needs to be upgraded to 200 / 400G or higher in the future. It will have to face many optical module types such as MSA. In the absence of IEEE standard project, users also need to care about whether there is open and standardized multi-mode wavelength multiplexing The emergence of technology, whether low-cost VCSEL 100G technology can make breakthroughs and other issues. Regardless of whether parallel transmission optical modules or duplex transmission optical modules will be used in the future, network cabling is an important network infrastructure in the data center. It is certain that the cabling of the data center must have openness, scalability, and flexibility to support Application of multiple network architectures.
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