Optical Splitters Demystified: The Silent Heroes Powering Your FTTH
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What is the next stage device after the optical splitter
The next stage device after an optical splitter in a PON or FTTH network is typically the Optical Network Unit (ONU) or Optical Network Terminal (ONT).
Role of the Optical Splitter
An optical splitter is a passive device that divides a single optical signal from the Optical Line Terminal (OLT) into multiple signals to serve several end users. It enables a point-to-multipoint network architecture, allowing multiple subscribers to share a single feeder fiber, which reduces deployment costs and simplifies network expansion .
Next Stage: ONU/ONT
After the optical splitter, the optical signals are delivered to ONUs or ONTs, which are the devices located near or at the end user's premises. These devices perform the following functions:
- Signal Termination: They terminate the PON and convert optical signals into electrical signals suitable for user devices .
- Service Interface: ONUs/ONTs provide interfaces for voice (POTS or VoIP), data (Ethernet), and video services .
- Upstream Transmission: They combine upstream signals from multiple users and send them back through the splitter to the OLT .
Deployment Architectures
- Centralized Splitting: A single-stage splitter connects directly to multiple ONUs/ONTs. The topology is OLT → Optical Splitter → ONU/ONT .
- Cascaded Splitting: In larger networks, multiple splitters may be used in series. The first-stage splitter distributes signals to secondary splitters, which then connect to ONUs/ONTs closer to the end users. This allows flexible network scaling and efficient fiber utilization .
Summary
In summary, after the optical splitter, the optical signal reaches the ONU or ONT, which serves as the interface between the passive optical network and the end user. The choice of centralized or cascaded splitting affects the placement and number of ONUs/ONTs, but in all cases, these devices are the next stage following the splitter in the network hierarchy .
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