Fiber guide
Choosing OS2, OM3, or OM4 Fiber Assemblies
The fiber designation should follow the transmission plan. Start with the active optics and route, then define connectors, polish, fiber count, mechanical construction, testing, and labels.
- Updated
- Reading time
- 7 min read
- Prepared by
- SUNPU technical team
Let the optical link choose the fiber
Record the transceiver type, operating wavelength, data rate, route distance, number of connections, and expected service life. OS2 is a single-mode fiber direction; OM3 and OM4 are multimode directions. The correct choice depends on the supported application rather than the cable color.
If the project is not yet tied to a transceiver, provide the current equipment interface and the planned migration path. That allows the fiber count and connector strategy to support both the first installation and realistic future changes.
- Transceiver or optics interface
- Wavelength and data rate
- Route distance
- Current and future application
Define every connector end
List connector type at end A and end B, UPC or APC polish, simplex or duplex format, adapter interface, keying, latch orientation, and any special clip or boot. A line item such as “LC-SC patch cord” is incomplete without polish and fiber type.
Use a consistent naming and color plan, but never rely on color as the only control. Labels and drawings should carry the actual fiber, connector, polarity, and destination information.
- End-A connector and polish
- End-B connector and polish
- Simplex, duplex, or multi-fiber
- Label and destination convention
Match construction to the route
Specify cable diameter, fiber count, tight-buffered or breakout arrangement, armor, pulling protection, fan-out length, jacket material, and indoor or outdoor conditions. For pre-terminated trunks, include pathway size, pulling direction, and available handling space.
For pigtails and splice assemblies, define stripped length, buffer format, color sequence, splice-tray arrangement, and packaging by set. For access products, add splitter ratio, connectorization, enclosure, and subscriber-side conditions.
Set loss and test requirements
Build a link budget from fiber attenuation, connectors, adapters, splices, splitters, and engineering margin. Translate that link budget into an assembly acceptance requirement that can actually be tested.
State test wavelength, insertion-loss and return-loss expectations, end-face inspection requirement, report format, serial-number linkage, and whether reports are required for every assembly or by batch.
- Link loss budget
- Test wavelengths
- End-face criteria
- Per-piece or batch report
Apply this guide
Send the current specification, drawing, or product list.
SUNPU can identify missing configuration fields, related components, sample requirements, and product-specific documents before quotation.
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