Optical Splitter Level 1 and Level 2 Connections
Level 1 (one-stage) and Level 2 (two-stage) optical splitter connections define how a single OLT signal is distributed to multiple end-users in FTTH networks, balancing fiber usage, bandwidth, and deployment cost.
Level 1 (One-Stage) Splitting
Level 1 splitting, also called one-stage or centralized splitting, involves a single optical splitter placed between the Optical Line Terminal (OLT) and the Optical Network Unit (ONU). Its basic configuration is: OLT → Optical Splitter → ONU
- Split Ratios: Typically 1:32 or 1:64, meaning one input fiber is split to serve 32–64 end-users .
- Placement: The splitter is usually installed centrally, either at the OLT location or in a fiber distribution hub, connected via backbone (feeder) fiber to the OLT and distribution fiber to the end-users .
- Advantages: Maximizes OLT port utilization, simplifies network management, and is cost-effective for areas with high-density subscribers .
- Considerations: Higher split ratios increase insertion loss, which may reduce bandwidth per ONU and require higher-power OLT optics .
Level 2 (Two-Stage) Splitting
Level 2 splitting, also called two-stage or cascaded splitting, uses two optical splitters in series: OLT → Optical Splitter 1 → Optical Splitter 2 → ONU
- Split Ratios: First-stage splitter usually 1:4 or 1:8; second-stage splitter 1:8 or 1:16, achieving an overall split similar to Level 1 but distributed .
- Placement: The first-stage splitter is often in a fiber distribution box or cabinet, while the second-stage splitter is closer to the end-user, such as in a residential area or community pedestal .
- Advantages: Suitable for dispersed or low-density subscriber areas, reduces fiber usage in the backbone, and allows flexible local distribution .
- Considerations: More complex deployment and slightly higher operational management due to multiple splitter locations .
Comparison of Level 1 and Level 2
| Feature | Level 1 (One-Stage) | Level 2 (Two-Stage) |
|---|---|---|
| Splitter Configuration | Single centralized splitter | Cascaded splitters (two stages) |
| Typical Split Ratios | 1:32, 1:64 | 1:4 or 1:8 (stage 1), 1:8 or 1:16 (stage 2) |
| Placement | Central office or fiber hub | First stage in distribution box, second stage near end-user |
| Best For | High-density areas | Dispersed or low-density areas |
| Fiber Usage | More backbone fiber | Saves backbone fiber, more local fiber |
| Bandwidth per ONU | Slightly higher per user | Slightly lower per user due to cascaded loss |
Key Considerations
- Insertion Loss: Higher split ratios reduce optical power per ONU, affecting reach and bandwidth .
- Scalability: Level 1 is easier to scale in dense areas; Level 2 allows incremental expansion in dispersed areas .
- Network Design: Operators often mix centralized and distributed splitting to optimize cost, fiber usage, and service flexibility . In summary, Level 1 splitting centralizes the optical distribution for dense networks, while Level 2 splitting cascades splitters to serve dispersed users efficiently, with each approach chosen based on subscriber density, fiber availability, and cost considerations.
Factory How to Design Your FTTH Network Splitting Level and Ratio?
Unearth in-depth insights into FTTH Network Design. Learn about the critical role of optical splitters, understand
Factory Troubleshooting Optical Splitters | ICT Solutions & Education
Optical splitters in the outside plant (OSP) are used mostly in passive optical networks (PONs) for fiber-to-the-user (FTTx) networks,
Factory Ubiquitous Fiber Networks with Huawei ODN 3.0
Since 2018, based on ODN 2.0, Huawei has gradually realized pre-connection between distribution optical cables and level-2 optical
Factory Split Ratios and Splitting Level of Optical Splitters
This article has reviewed some information about the split ratios and splitting level of fiber optic splitters. It is very
Factory Introduction to Passive Optical Network Splitter Architectures
Fiber Broadband Association Technology Committee February 2025 The choice of splitter architecture for a passive optical network
Factory PLC Splitter and download the loss chart of PLC splitter
Optical splitters, including FBT (Fused Biconical Taper) couplers and PLC (Planar Lightwave Circuit) splitters, are
Factory What Is an Optical Splitter?
What''s an optical splitter? How does the fiber optic splitter work? How many fiber splitter types? How to choose the
Factory The Working Principle and Application Scenarios of Fiber Optic Splitters
The working principle of fiber optic splitters is based on optical coupling and splitting . When a light signal enters the
Factory Optimizing Your FTTH Design: Strategies for Designing Split Levels
Optimizing Your FTTH Design: Unleashing the Power of Split Level and Split Ratio. Explore the 2 Key Architectural Choices that Will
Factory Optimising FTTH Design: Split Levels & Split Ratios
The real design trade-offs lie in how you split the optical signals, where you locate the splitters, and the ratio you
Factory The FOA Reference For Fiber Optics
These devices are generally bidirectional. With a 1:n device, in one direction they split the signal into n ports/fibers and into the other
Factory Your Go-to Guide to Optical Splitter
The optical splitter is an optical power distribution device that splits one optical signal into multiple optical fiber signals
Factory How to Design Your FTTH Network Splitting Level and Ratio?
Learn about the critical role of optical splitters, understand different splitting levels and ratios, and discover how to
Factory Basic Knowledge about Split Ratio and Insertion Loss of Optical Splitter
Optical splitters are vital in FTTH PON systems, distributing a single signal efficiently. Key parameters, Split Ratio and
Factory What is Fiber Optic Splitter and Types
This post provides a introduction to fiber optic splitters, their types, functions, and several popular Gcabling optical
Factory Introduction to Passive Optical Network Splitter Architectures
This involves having 2 or more splitter combinations to arrive at the target split ratio. A classic example is the use of a 1x4 and 1x8
Factory Fiber-optic splitter
A fiber-optic splitter, also known as a beam splitter, is based on a quartz substrate of an integrated waveguide optical power
Factory Optical Splitters: Split Ratios, Splitting Architectures & PON Network
Learn about optical splitter split ratios (1:N, 2:N), centralized vs. cascaded architectures, and how to choose the right
Factory A Guide to Optical Splits to Improve your Fiber Game! |
Shown in Figure 4, an operator will drop fiber #1 to a local premises'' terminal feeding splitter #1, while additional fibers continue
Factory PASSIVE OPTICAL SPLITTER
The failure of an optical splitter is catastrophic to a PON system because multiple customer connections may be affected.
Factory Understanding The Split Ratios And Splitting Level Of Optical Splitters
Split Ratios There are a multitude of split ratios available. The most common splitters deployed in a PON system is a uniform power
Factory Optical Splitters Demystified: The Silent Heroes Powering Your FTTH
There are two main manufacturing technologies for optical splitters, each with its own advantages and ideal use
Factory Understanding Optical Splitter Loss
Understanding Optical Splitter Loss – How to Test Splitter Power Levels To accurately assess signal loss and verify
Factory Level 1 and Level 2 Splitting in FTTH Networks-BLOG-Grandway
In two-stage splitting applications, the first-stage optical splitter is often installed in an optical distribution box or a fiber-splitting box,
Factory Primary and secondary optical splitters in FTTH networks
In the application of two-stage optical splitter, the first stage optical splitter is often installed in the optical junction box