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 →Browse sourcing categories
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: we confirm availability and pricing with verified suppliers, and if it is workable, we supply the fiber, from test spool to commercial batch.
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 |
Attenuation
≤0.35 dB/km
1310 nm
Attenuation
≤0.21 dB/km
1550 nm
Attenuation
≤0.23 dB/km
1625 nm
PMD (link design value)
≤0.06 ps/√km
M=20, Q=0.01%
Mode-field diameter
8.2–9.0 µm
1310 nm
Cladding diameter
125 ± 0.7 µm
Coating diameter
235–245 µm
Cable cutoff wavelength
≤1260 nm
Macro-bend loss
≤0.15 dB
R5 mm, 1 turn @ 1550 nm
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.
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
Bulk and recurring supply of bare single-mode optical fiber on spools for distributors, manufacturers, installers and infrastructure projects.
View specifications →Submit an RFQ for G.657.B3 Optical Fiber
Send a structured request: we check availability and pricing with our verified suppliers, and if the request is workable, we supply the product.