G.657.B3 Single-mode optical fiber

Built for tighter fiber routing

G.657.B3 bend insensitive FTTH optical fiber on reels for constrained indoor cable designs. Keep the 5 mm reference test radius separate from the finished cable installation limits.

Attenuation · 1550 nm: ≤ 0.210 dB/km
Cladding diameter: 125 ± 0.7 μm
Coating diameter: 242 ± 7 μm

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PRODUCT DATA

Technical specifications

Values below are supplier reference limits. Test conditions and units are shown for engineering review.

G.657.B3 optical fiber reference specifications
Parameter / test condition	Reference specification
Attenuation at 1550 nm	≤ 0.210 dB/km
Cladding diameter	125 ± 0.7 μm
Coating diameter	242 ± 7 μm
Mode field diameter at 1310 nm	8.6 ± 0.4 μm
Macrobend: 5 mm radius, 1 turn, 1550 nm	≤ 0.15 dB
Macrobend: 5 mm radius, 1 turn, 1625 nm	≤ 0.45 dB

Reference source: Jiangsu Nanfang Optical Fiber Product Manual, pages 9–10. Translated from the Chinese manufacturer document. Values describe the source grade; confirm the offered supplier, coating and batch conformity with your quote. Manufacturer series names identify source products, not an authorized distributorship.

SPECIFICATION & PROCUREMENT

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Clear answers from the reference specifications, with the supply scope kept explicit.

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Does the G.657.B3 5 mm test define a cable installation radius?

The listed ≤ 0.15 dB value applies to a fiber test at 1550 nm, a 5 mm radius and one turn. It does not specify the installation bend radius of a finished cable. Confirm that requirement with the cable supplier.

Is this optical fiber on reels or a finished fiber optic cable?

This page describes coated optical fiber on reels for use before cabling, not a finished cable, connector assembly or installed channel. The published table is supplier reference data, not a test report for your order. Ask the quotation to identify the offered manufacturer, exact grade and coating, and the documents that will accompany the allocated reels.

What should I include in a G657B3 optical fiber RFQ?

For G.657.B3, specify the coating option, total fiber-km, preferred continuous length per reel, and delivery country and ZIP or postal code. Request the offered datasheet, traceable reel list and applicable batch test report; state required fields and approval timing. Identify acceptable alternatives separately. Pricing, minimum order quantity and lead time are confirmed with the actual supplier quotation. RFQ checklist → · Reel documentation →

G.657.B3 Single-mode optical fiber

Built for tighter fiber routing

Technical specifications

Before you request a G.657.B3 quote.

Make a more informed decision.

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