2F Butterfly Flat Indoor FTTH Drop Cable

Type: 2-fiber butterfly flat indoor FTTH drop cable (final FTTH link)

Structure: Central colored fiber, 2 parallel FRP/steel members (0.45-0.52mm), LSZH sheath; size ~2.0×3.0mm, weight ~7.5/10.5 kg/km

Optical Performance: Insertion loss <0.3dB; Return loss >50dB (UPC)/>60dB (APC) (1310nm)

Features: Lightweight, easy to install; anti-interference; bend-insensitive fiber for stable transmission

Fiber: Single-mode G.657A1/G.657A2 (compliant with ITU-T G.657)

Connectors: High-precision ceramic ferrule (<0.5μm); SC/LC optional

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Product Description
Specification
Product Advantage

Product Description

1 Scope

This specification defines the structure, optical performance, mechanical performance, environmental performance, fiber parameters, connector requirements, and application scope of 2‑fiber butterfly flat indoor FTTH drop cable assemblies. It applies to indoor cabling, end‑user direct connection, and premises distribution systems in FTTH and access networks.

2 General Description

The product is a pre‑terminated butterfly flat indoor drop cable assembly, designed as the final access link in FTTH deployment. It features a central optical fiber unit, two parallel strength members, and an LSZH flame‑retardant sheath. It offers easy stripping, splicing, and installation, with excellent bend insensitivity, anti‑electromagnetic interference, and lightning protection (non‑metallic strength member).

3 Structure

• Fiber count: 2 fibers

• Optical fiber: Colored coating, centered in the cable

• Strength members: Two parallel FRP or steel wires, diameter 0.45–0.52 mm

• Sheath: LSZH (Low Smoke Zero Halogen), flame retardant

• Cable dimensions: Approx. 2.0(±0.1) × 3.0(±0.2) mm

• Weight: Approx. 7.5 / 10.5 kg/km

Specification

4 Optical Performance (1310 nm LED)

Item	Condition	UPC (dB)	APC (dB)
Insertion Loss	—	< 0.3	< 0.3
Return Loss	—	> 50	> 60

5 Environmental Performance

(Max. insertion loss variation)

Test	Condition	Max. ΔIL (dB)
High temperature	+85 °C, 168 h	< 0.2
Temperature cycle	−40 °C ↔ +75 °C, 21 cycles, 168 h	< 0.2
Humidity aging	+75 °C, 95 %RH, 168 h	< 0.2
Humidity/condensation cycle	−10 °C ↔ +65 °C, 90–100 %RH, 14 cycles, 168 h	< 0.2

6 Mechanical Performance

(Max. insertion loss variation)

Test	Condition	Max. ΔIL (dB)
Vibration	10–55 Hz, 1.5 mm (p‑p)	< 0.2
Flex	0.9 kg, −90° ↔ +90°, 100 cycles	< 0.2
Torsion	1.35 kg, −90° ↔ +90°, 10 times	< 0.2
Tensile strength	90 N, 10 min	< 0.2
Drop	1.5 m, 8 times	< 0.2
Exchangeability	Random mating	< 0.2
Durability	500 matings	< 0.2

7 Mechanical & Environmental Compliance (IEC 60794‑1‑2)

Item	Standard	Requirement
Tension	E1	Additional attenuation ≤ 0.4 dB
Crush	E3	Additional attenuation ≤ 0.4 dB
Impact	E4	Additional attenuation ≤ 0.4 dB
Repeated bending	E6	Additional attenuation ≤ 0.4 dB
Temperature cycling	F1 (−40 °C to +70 °C)	Attenuation change ≤ 0.4 dB/km

8 Cable Mechanical Parameters

Item	Value
Tensile strength (short/long term)	Steel: 200 / 100 N FRP: 80 / 40 N
Crush resistance (short/long term)	1000 / 500 N/100 mm
Operating temperature	−40 °C to +70 °C

9 Fiber Specification

9.1 Single‑mode fiber type

G.657A1 / G.657A2

9.2 Common parameters

Item	Unit	Value
Cladding diameter	μm	125.0 ± 0.7
Coating diameter	μm	245 ± 5
Cable cutoff wavelength	nm	≤ 1260
Attenuation @1310 nm	dB/km	≤ 0.36
Attenuation @1550 nm	dB/km	≤ 0.22
Proof stress	kpsi	≥ 100

9.3 G.657A1 macro‑bend loss (1 turn, 10 mm radius)

• 1550 nm: ≤ 0.75 dB/km

• 1625 nm: ≤ 1.5 dB/km

9.4 G.657A2 macro‑bend loss (1 turn, 7.5 mm radius)

• 1550 nm: ≤ 0.5 dB/km

• 1625 nm: ≤ 1.0 dB/km

10 End‑Face Quality (Single‑mode, IEC 61300‑3‑35:2015)

Zone	Range (μm)	Scratches	Defects
A (Core)	0–25	None	None
B (Cladding)	25–115	None	None
C (Adhesive)	115–135	None	None
D (Contact)	135–250	None	None
E (Ferrule remainder)	—	None	None

11 Connector Requirements

• Ferrule: High‑precision single‑mode ceramic, concentricity < 0.5 μm

• Compliance:

￮ SC: IEC 61754‑4, TIA/EIA FOCIS3, GR‑326

￮ LC: IEC 61754‑20, TIA/EIA FOCIS10, GR‑326

• Custom connector types available

12 Key Features

• Simple, lightweight structure, high practicality

• LSZH flame‑retardant, low smoke, halogen‑free

• Easy stripping and splicing, simple installation

• Excellent crush resistance and anti‑electromagnetic interference

• Bend‑insensitive fiber, high bandwidth and stable transmission

• Suitable for indoor FTTH, LAN, and access network cabling

13 Applications

• FTTH indoor and building cabling

• Access networks

• Local area networks (LAN)

• Optical communication equipment interconnection

• Wall outlets, terminal boxes, ONU connections

14 Notes

All other fiber parameters comply with ITU‑T G.657.

Product Advantage

1

Simple and lightweight structure, highly practical for indoor use
2

LSZH sheath, featuring flame-retardant, low smoke and halogen-free properties
3

Easy to strip, splice and install, saving deployment time
4

Anti-electromagnetic interference and good crush resistance
5

Bend-insensitive fiber ensures high bandwidth and stable transmission
6

Compatible with standard connectors (SC/LC) and customizable