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Bandwidth, the driving force of network evolution AN JUNFENG, Market Department, NBU

Time:2017-08-23  

In the coming 3-5 years, we will have more subscribers, this is because the fix broadband penetration ratio is only 11% all over the world, there is huge market potential and number of subscribers will keep increasing. Also we will have more connections driving by M2M, smart home, smart cities, by 2020 there will be 33+ billion devices connected, 4.3 devices per sub. New app & services will be more bandwidth-hungry, including but not limited to online gaming(VR), streaming video(4K/8K),telepresence(online meeting/study),cloud services, big data, mobile backhaul. All this leads to higher bandwidth demand, especially in access layer. For the last 5+ years, we already have a 20% bandwidth CAGR across industry. In the near future, 25G+ bandwidth per PON port for residential and 40G+ per PON port for business are required.

To fulfill such bandwidth requirement, over 100 countries had launched national BB strategy, meanwhile more and more telcos are offering ultra BB to users, by statistic from infonetics, 40% of SP planning to offer 1G+ internet by 2017. Why? Ultra BB can help country in so many aspects, but all results in booming economy. For Telcos, ultra BB can help them to positioning market leadership & beat competitors, severing high-end users, providing combine services, which also result in booming revenues.

But how can we find a solution for ultra BB? From my point of view, there are several key factors. 1st, reuse existing ODN and coexist with previous PON technologies. 2nd, it must support all user types including residential & business users. 3rd, it must find the balance of performance, capex & opex.

We can divide PON standard into 4 eras, 1G-PON now have been large scale deployed, next year will be the first year of 10G-PON era, post 10G-PON is under standardization, 100G PON(actually included in post 10G-PON).

So the solution is either we increase single wavelength speed or increase single fiber capacity. It seems IEEE & ITUT has different choices, but finally it will all goes to WDM based 100G PON.

IEEE take the lead of 25G/100G PON standardization, in Dec, 2015, task force of P802.3ac has been approved, the main point is to reuse optical components & function block of current 10G EPON standard. ITUT also has plan for 25G/100G PON, but currently no SG has been set up. FiberHome contributes multiple proposal in IEEE 100G PON.

We have 3 modulation options for 100G PON, NRZ-OOK has been widely used for current PON tech, duobinary has been used in disk arrays for years, PAM4 also has been used for years in modems.

To choose a modulation mode, we need to have an overall consideration, including spectrum, eye opening, complexity and required power, required RX equalize boost, cross talk sensitivity. According to test results, NRZ-OOK is the best choice for now, but duobinary also has a chance in the future.

To save capex & opex, gradual upgrade capability is very important. We have 2 ways to deploy 100G PON, one is 3-step upgrade, depends on bandwidth demands, we can choose 25G for the 1st step, then 25G/50G coexist, 25G/50G/100G coexist is the final step.

Also we can choose 1 step for OLT, 3 step for ONU, which means upgrade OLT to 100G PON at one go, but gradually upgrade ONU on demand.

This makes very flexible choice for Telcos.

We will benefit from 25G/100G PON both in cost and smooth migration.

Compare to gpon, we need only 20% more investment for 4 times bandwidth, 50% more investment for 16 times bandwidth. All this will happen in existing ODN.

The benefit by choosing 100G PON also including WDBA, Zero Interruption, energy saving. WDBA allows flexible wavelength allocation & adjustment, better bandwidth utilization efficiency. By providing wavelength level service protection, we will have zero down time for all services. With wavelength shut down capability and etc., we will have less power consumption.

As the leading company in the industry, FiberHome starts 100G PON R&D since 2015 and makes unique contributions. We have utilized 25G transmission based on 10G-class optics, which can reduce the cost. DI based optical equalizer can improve performance tremendously. This year, FiberHome deploy field trial in ShangHai JIAOTONG university, CHINA. This trial connects two campus of JIAOTONG university after a ratio of 1:64, 40km long distance transmission of ODN in each campus. We use unified OLT platform which support all current PON tech, and 100g PON service card use C-band 1535-1565nm, and colorless ONU.

FiberHome dedicates in PON R&D for over 18 years. Our goal is to help customers to deliver more services with less cost. FiberHome will keep innovating to make a better connected world.

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