We also offer no-connector FBT options, allowing for easy installation in fiber splice closures or fiber distribution boxes, saving space. These FBT Splitters are ideal for GPON, FTTH/FTTx applications.
FBT Splitter
FBT Splitter (Fused Biconical Taper) 1×3 – 1xN LC/UPC SM & MM
Fused biconical taper splitter with 1×3 to 1×N ports in singlemode or multimode, terminated LC/UPC in a compact steel tube. Custom coupling ratios from 50/50 to 1/99, single, dual or triple operating windows, and 250µm bare, 0.9mm, 2.0mm or 3.0mm leads for GPON, FTTH/FTTx, CATV and test links.
Overview
A fused biconical taper (FBT) splitter is a passive optical coupler built by fusing and tapering two or more fibers so that light couples between them in the tapered region. This model splits one input into 3–N outputs (1×3–1×N) in singlemode or multimode, with custom ratios from 50/50 to 1/99 and LC/UPC terminations in a compact steel tube.
Specify this page for mixed singlemode/multimode plant or port counts beyond a standard 1×2. Configurations run 1×2 to 1×24, from balanced distribution (50/50) to light monitoring taps (10/90, 1/99). LC/UPC on 0.9mm leads is standard; SC, FC, ST, E2000, APC polish, 250µm bare and 2.0/3.0mm LSZH leads are orderable.
Key Features
- Low excess loss — 0.1 dB typical (SM); the full-ratio loss matrix below gives measured limits for link budgets.
- Low PDL — max 0.15 dB (SM), 0.2–0.5 dB across 1×N ports; output stays stable under polarization drift.
- High return loss and directivity — RL ≥55 dB, directivity ≥55 dB (SM); ≥40 dB (MM) — clean isolation for monitoring and tap legs.
- Eleven published coupling ratios — 50/50 default, 45/55 through 1/99 optional — even splitting and light tapping in one family.
- Singlemode and multimode builds in one steel-tube platform — SM: G652D/G657A1/A2 (1×N table: Corning SMF-28e); MM: Corning MMF 62.5/125µm or 50/125µm, 850/1310nm.
- Qualified under Telcordia GR-1221 and GR-1209 (per BWNFiber product documentation).
Specifications
Values are reproduced verbatim from the current specification tables; per those tables, insertion loss data excludes connectors — add the mated-pair connector allowance in your loss budget (budget math: splitter loss chart (1×2 to 1×64)).
Singlemode — Coupling Ratio vs Insertion Loss
| Coupling Ratio | Tap IL (dB) | Signal IL (dB) |
|---|---|---|
| 50/50 | 2.8-3.6 | ≤3.6 |
| 45/55 | 3.3-3.9 | ≤3.0 |
| 40/60 | 3.8-4.5 | ≤2.6 |
| 35/65 | 4.2-5.0 | ≤2.2 |
| 30/70 | 4.6-5.7 | ≤1.9 |
| 25/75 | 5.8-6.7 | ≤1.6 |
| 20/80 | 6.7-7.6 | ≤1.2 |
| 15/85 | 7.8-9.0 | ≤0.98 |
| 10/90 | 9.3-11.0 | ≤0.63 |
| 5/95 | 12.4-14.0 | ≤0.41 |
| 1/99 | 18.6-21.0 | ≤0.25 |
| Excess Loss (Typ.) | 0.1 dB | |
| PDL (Max.) | 0.15 dB | |
| Operating Wavelength | 1310±40, 1550±40, 1310/1550±40, 1310/1550/1490±40 nm or custom wavelength | |
| Directivity | ≥55 dB | |
| Port Configuration | 1×2 or 1×N | |
Note: All the data above does not include connectors.
Singlemode 1×N / 2×N (N=3–32)
| Parameter | Unit | N=3 | N=4 | N=5 | N=6 | N=8 | N=10 | N=16 | N=24 | N=32 |
|---|---|---|---|---|---|---|---|---|---|---|
| Operating Wavelength | nm | 1310±40, 1550±40, 1490±10 | ||||||||
| Fiber Type | — | Corning SMF-28e | ||||||||
| IL (MAX) | dB | 5.6 | 7.1 | 8.3 | 9.2 | 10.6 | 11.75 | 14.4 | 15.6 | 17.4 |
| Uniformity | dB | 0.5 | 0.7 | 1.1 | 1.3 | 1.5 | 1.7 | 1.8 | 2 | 2.2 |
| Return Loss | dB | ≥55 | ||||||||
| Directivity | dB | ≥55 | ||||||||
| PDL | dB | 0.2 | 0.2 | 0.3 | 0.3 | 0.3 | 0.3 | 0.4 | 0.5 | 0.5 |
Note: All the data above does not include connectors.
Multimode — Coupling Ratio vs Insertion Loss (850/1310nm)
| Splitting Ratio | Tap IL @1310nm (dB) | Signal IL @1310nm (dB) | Tap IL @850nm (dB) | Signal IL @850nm (dB) |
|---|---|---|---|---|
| 50/50 | 3.0-4.1 | ≤4.1 | 3.0-4.1 | ≤4.1 |
| 40/60 | 4.3~5.4 | ≤3.0 | 3.8~4.9 | ≤3.4 |
| 30/70 | 5.1~7.0 | ≤2.3 | 4.9~6.4 | ≤2.4 |
| 20/80 | 7.2~9.4 | ≤1.65 | 6.3~8.1 | ≤1.9 |
| 10/90 | 9.8~14.5 | ≤1.15 | 8.3~11.5 | ≤1.4 |
| 1/99 | 19.1-22.3 | ≤0.70 | 16.8-21.5 | ≤0.75 |
| Operation Wavelength | 850±40, 1310±40, 850/1310±40 nm | |||
| Directivity | ≥40 dB | |||
| Operating Temperature | -20～+70℃ | |||
| Storage Temperature | -40～+85℃ | |||
Multimode 1×N (N=3–16)
| Parameter | Unit | N=3 | N=4 | N=5 | N=6 | N=8 | N=16 |
|---|---|---|---|---|---|---|---|
| Fiber Type | — | Corning MMF 62.5/125µm or 50/125µm | |||||
| Test Wavelength | nm | 850±40 | |||||
| IL (MAX) | dB | 6.8 | 8.3 | 10.2 | 10.9 | 9.1-12.4 | 12.1-16.5 |
| Uniformity | dB | 1 | 1.5 | 2 | 2 | 2 | 3 |
| Test Wavelength | nm | 1310±40 | |||||
| IL (MAX) | dB | 6.6 | 8.3 | 10 | 10.7 | 12.4 | 12.1-16.5 |
| Uniformity | dB | 1 | 1.5 | 2 | 2 | 2 | 3 |
| Return Loss | dB | ≥40 | |||||
| Directivity | dB | ≥40 | |||||
Note: All the data above does not include connectors.
Multimode operating temperature: -20～+70℃ (storage -40～+85℃).
Connectors, Fiber Types & Compatibility
Standard build: LC/UPC on 0.9mm loose-tube leads, 1m input/output (custom lengths orderable). The connector menu covers SC, LC, FC, ST and E2000 in UPC or APC polish; 250µm bare-fiber and 2.0/3.0mm LSZH lead options splice into trays or route like patch cords.
Fiber modes: singlemode G652D or G657A1/A2 (the 1×N table specifies Corning SMF-28e); multimode Corning MMF 62.5/125µm or 50/125µm, with OM4 900µm gallery variants (1×2 LC/UPC, 70/30 and 50/50). Never mix modes in one link — a singlemode coupler in multimode plant breaks the loss budget. For ODN-side hardware, see the FTTx supporting products range.
Applications
- FTTH/FTTx deployments (FTTP, FTTH, FTTN, FTTC, FTTB): 1×3 and 1×N splits at central office or distribution points, indoor or outdoor.
- GPON and passive optical networks: the triple-window option (1310/1490/1550±40nm) carries upstream, downstream and video overlay on one coupler.
- CATV systems, fiber sensors, monitoring and test equipment: unequal ratios feed monitoring or OTDR ports while the through leg keeps ≤1.2 dB (20/80) or ≤0.25 dB (1/99) loss.
- LAN, WAN, metro and data links: multimode OM4 variants serve premises backbones at 850/1310nm.
How to Choose: Mode, Ratio, Ports, Window, Leads
- Fix the fiber mode first. Singlemode (G652D/G657A) for OSP and PON links; multimode (62.5/125, 50/125, OM4) for premises and data links.
- Pick the ratio from the power math. Even split: 50/50 at 2.8–3.6 dB per leg (SM). Monitoring taps: 10/90 keeps the through leg ≤0.63 dB; 1/99 keeps it ≤0.25 dB.
- Pick the port count. 1×2 to 1×24 are standard order configurations; the SM table specifies IL to N=32 (17.4 dB max), the MM table to N=16.
- Pick the operating window. Single (1310 or 1550), dual (1310/1550) or triple (1310/1490/1550) for GPON coexistence; multimode runs 850/1310nm.
- Pick connector and polish. LC/UPC is standard here; SC/FC/ST/E2000 and APC polish are orderable. Use APC where reflectance matters (RF video, PON).
- Pick the lead format. 250µm bare for splice trays, 0.9mm loose tube for closures, 2.0/3.0mm LSZH for patch-style routing.
Other 1×3 FBT Options: Which Page Fits Your Build?
| If you need… | Go to |
|---|---|
| 1×3 even split, singlemode, FC/APC | 1×3 FBT splitter with FC/APC |
| 1×3 unequal tap (70/30 or 90/10), SC/APC, 3.0mm | 1×3 SC/APC unequal tap coupler |
| Full FBT family — all ratios, packages, connectors, OEM builds | FBT splitter category page |
| 1×3–1×N, LC/UPC, SM + MM, custom ratio matrix (this page) | — |
For category-level browsing, start at the FBT splitter category or the fiber optic splitter overview.
Testing & Quality Control
Optical performance is verified against the parameters in the specification tables above; compliance with Telcordia GR-1209-CORE and GR-1221-CORE is stated per BWNFiber product documentation.
Packaging & Ordering Information
Ordering options, per current product documentation:
- Split ratios: 40/60, 30/70, 20/80, 10/90, 5/95, 2/98, 1/99 (50/50 as default)
- Port configurations: 1×2, 1×3, 1×4 … 1×24
- Lead format: 250µm bare fiber, 0.9mm loose tube, 2.0mm or 3.0mm LSZH cable
- Grade: Grade A — fused biconical tapered (this page); Grade P — standard planar technology
- Lead length: default 1m; customized input/output lengths available
Packaging, labeling and per-order documentation are confirmed with each order.
Request a Quote: Six Parameters to Include
- Fiber mode — singlemode (G652D/G657A) or multimode (62.5/125, 50/125, OM4)
- Port configuration — 1×3, 1×4 … 1×24 (or 2×N)
- Coupling ratio — 50/50, 40/60 … 1/99, or custom
- Operating window — single, dual (1310/1550) or triple (1310/1490/1550); MM: 850/1310
- Connector and polish — LC/UPC standard; SC/FC/ST/E2000, APC optional
- Lead format and length — 250µm bare, 0.9/2.0/3.0mm; default 1m
Contact our team or use the inquiry form on this page. State your application (FTTH, CATV, LAN, test) so we can confirm the configuration against your link budget.
FAQ
FBT Splitter (Fused Biconical Taper) 1×3 – 1xN LC/UPC SM & MM FAQ
What is a fused biconical taper splitter?
A fused biconical taper (FBT) splitter is a passive coupler made by fusing and tapering two or more fibers so light transfers between them in the tapered region, splitting one input into multiple outputs at a defined ratio. This page covers 1×3–1×N ports, singlemode and multimode, ratios 50/50 to 1/99.
What split ratios can I order on this FBT splitter?
Published ratios: 50/50 (default) plus ten more down to 1/99 (SM table); the order menu adds 2/98. A 50/50 split carries 2.8–3.6 dB per leg (SM); a 1/99 tap keeps the through leg ≤0.25 dB. Custom ratios are also available on request.
Is this FBT coupler available in multimode?
Yes. Multimode builds use Corning MMF 62.5/125µm or 50/125µm at 850/1310nm, with directivity ≥40 dB and return loss ≥40 dB per the MM tables, operating -20～+70℃. Verified gallery variants: 1×2 LC/UPC OM4 900µm in 70/30 and 50/50. Multimode 1×N runs N=3 to N=16.
What is the insertion loss of a 1×3 FBT splitter?
An even-split singlemode 1×3 (N=3) has 5.6 dB max insertion loss, 0.5 dB uniformity, excluding connectors. The multimode 1×3 maximum is 6.8 dB at 850nm, 6.6 dB at 1310nm. Return loss is ≥55 dB (SM) and ≥40 dB (MM). Unequal-ratio 1×3 taps follow the per-leg coupling ratio table.
Do the specification values include connector loss?
No. Every table states “All the data above does not include connectors.” This applies to both the singlemode and multimode tables on this page. Budget the mated-pair connector allowance separately, and confirm the adder for your connector type (LC/UPC, SC/APC, others) at RFQ.
What lead length and fiber diameter can I order?
Four lead formats are orderable: 250µm bare fiber for splice trays, 0.9mm loose tube for closures, and 2.0/3.0mm LSZH cable for patch-style routing. Input or output fiber lengths can be customized, default 1m; no-connector versions splice directly into closures or distribution boxes.
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