Product category
G.657.A2 Optical Fiber
B2B wholesale sourcing of G.657.A2 bend-insensitive single-mode optical fiber, fully compatible with G.652.D, supplied on spools for telecom and infrastructure use.
View specifications →Fiber Optic Products
G.657.B3 Optical Fiber
B2B wholesale sourcing of G.657.B3 ultra-bend-insensitive single-mode optical fiber, rated for bend radii down to 5 mm, supplied on spools for tight-routing and compact installations.
G.657.B3 is an ultra-bend-insensitive single-mode fiber rated for bend radii down to 5 mm, designed for the tightest routing and most space-constrained installations.
IBT Services B.V. sources G.657.B3 fiber on spools for telecom and infrastructure buyers — from test and sample batches through to bulk commercial quantities. Specify length per spool, total quantity and any documentation requirements in your RFQ, and we will check availability, pricing and delivery through our supplier network.
Technical data
Key specifications
| Parameter | Condition | Specified value |
|---|---|---|
| Attenuation | 1310 nm | ≤0.35 dB/km |
| Attenuation | 1550 nm | ≤0.21 dB/km |
| Attenuation | 1625 nm | ≤0.23 dB/km |
| PMD (link design value) | M=20, Q=0.01% | ≤0.06 ps/√km |
| Mode-field diameter | 1310 nm | 8.2–9.0 µm |
| Cladding diameter | — | 125 ± 0.7 µm |
| Coating diameter | — | 235–245 µm |
| Cable cutoff wavelength | — | ≤1260 nm |
| Macro-bend loss | R5 mm, 1 turn @ 1550 nm | ≤0.15 dB |
| Delivery length | — | up to 25.2 km/reel |
| Standards | — | ITU-T G.657.B3 |
Typical specified values for G.657.B3 single-mode fiber. Exact values per delivery depend on the supplier batch and datasheet.
Examples
Example products
Examples of products that may fall within this sourcing category:
- G.657.B3 single-mode optical fiber (on spool)
- Test spool or sample batch for qualification
- Bulk G.657.B3 spool batches
Selection notes
What to specify
Use these points to prepare a precise RFQ for this category.
| Area | What to specify |
|---|---|
| Bend performance | Ultra-bend-insensitive, rated down to a 5 mm bend radius for very tight routing. |
| Use case | Compact installations, tight corners, dense patch panels and demanding cable designs. |
| Batch type | Test or sample spool for qualification, or commercial bulk batch. |
| Volume | Length per spool and total quantity required. |
Frequently asked questions
What makes G.657.B3 different from G.657.A2?
G.657.B3 is ultra-bend-insensitive and rated for much tighter bend radii — down to 5 mm — compared with G.657.A2's 7.5 to 15 mm range. B3 is chosen where routing is very tight or space is constrained.
When should I choose G.657.B3?
G.657.B3 suits compact installations, tight corners, dense patch panels and demanding cable designs where the fiber must bend sharply without significant loss.
Can I order a test spool first?
Yes. Test spools or sample batches can be requested for qualification before a larger commercial order. Specify length and quantity in your RFQ.
What spool lengths are available?
Delivery lengths of up to 25.2 km per reel are typical, depending on the supplier batch. Specify your required length per spool in the RFQ.
Related
Related categories
Product category
G.652.D Single-Mode Fiber
B2B wholesale sourcing of G.652.D standard single-mode optical fiber on spools, with test batches and bulk supply for telecom, infrastructure and distribution buyers.
View specifications →Product category
Bulk Fiber Spools
B2B wholesale supply of bare optical fiber in bulk spool quantities across single-mode standards, for distributors, telecom and infrastructure buyers ordering at volume.
View specifications →Submit an RFQ for G.657.B3 Optical Fiber
Send a structured request and IBT will review availability, pricing, technical requirements and delivery options.