Article Overview
A single optical splitter does not have its own bandwidth; the bandwidth is determined by the OLT port it serves and is shared among all outputs according to the split ratio.
How Splitters Work
An optical splitter is a passive device that divides a single optical signal into multiple outputs without requiring power or active electronics . It is commonly used in Passive Optical Networks (PON) to connect one OLT (Optical Line Terminal) port to multiple ONTs (Optical Network Terminals) at subscriber premises. The splitter itself does not generate or limit bandwidth; it simply distributes the optical signal.
Bandwidth Sharing
The effective bandwidth per subscriber depends on the OLT port capacity and the split ratio:
- For a 1 Gbps OLT port with a 1:32 splitter, each subscriber theoretically receives about 31 Mbps .
- The same 1 Gbps port with a 1:64 splitter reduces per-subscriber bandwidth to roughly 15 Mbps .
- For gigabit service per subscriber, lower split ratios like 1:8 or 1:16 are recommended. If the OLT port is 10 Gbps, the total bandwidth is higher, but it is still shared among all outputs according to the splitter ratio.
Splitter Configurations
There are two common deployment approaches:
- Centralized (single-level) splitters: A large splitter (e.g., 1×32 or 1×64) is placed in a central office or distribution point, connecting directly to multiple subscribers .
- Cascaded (multi-level) splitters: Smaller splitters (e.g., 1×4 followed by 1×8) are used in stages to reach the same total number of subscribers, which can help reduce fiber usage but may increase insertion loss .
Practical Implications
- The splitter ratio directly affects per-subscriber bandwidth and optical power margin. Higher split ratios reduce bandwidth per user and may require higher-power OLT optics .
- Splitters introduce insertion loss, which must be accounted for in network design to ensure reliable signal reception at the ONT .
- For planning purposes, the total bandwidth of a splitter is effectively the bandwidth of the OLT port it serves, divided among the number of outputs. In summary, a single optical splitter does not have a fixed gigabyte capacity; its bandwidth is determined by the OLT port and split ratio, and careful planning is required to ensure adequate service for all subscribers.
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