Overview
A 1×2 FBT splitter with a 50/50 coupling ratio divides one singlemode optical input into two equal outputs. This model — FBT-1×2-SM-2.0-Bare-5050 — uses fused biconical taper technology in an ABS module and ships without connectors: the 2.0mm bare fiber leads are built for permanent fusion splicing in closures and splice trays.
Specify it when the splitter is spliced into ODN plant and no connector-pair loss or reflectance can enter the budget. It fits FTTH distribution points, CATV overlays, 1+1 protection feeds, and test access at 850/980/1310/1480/1550/1585nm or custom wavelengths. For plug-and-play SC/LC interfaces or uniform behavior across 1260–1650nm, compare the PLC 1×2 siblings below.
Key Features
- 50/50 coupling ratio: equal split on both ports (FBT table: tap 2.8–3.6dB, signal ≤3.6dB) for two-way distribution and 1+1 redundant feeds.
- Insertion loss ≤3.4dB (Page list), close to the 3dB theoretical value of an equal split; excess loss 0.1dB typical.
- No connectors fitted: published data excludes connectors and this unit has none — the installed link adds only fusion splice loss, with no connector-pair IL or return-loss penalty.
- Directivity ≥55dB, return loss 55dB: keeps reflected power away from the source on analog CATV and high-speed digital links.
- PDL ≤0.1dB (Page list; FBT table states 0.15dB max).
- ABS module with 2.0mm jacketed leads (3.0mm optional) protects the fused region; G657A fiber tolerates tight tray coiling.
- Operating temperature -40~+85°C covers outdoor closures and uncontrolled cabinets.
Specifications
Two BWNFiber sources are used: this page’s specification list (“Page list”) and the 50/50 row of the site FBT singlemode coupling-ratio table (“FBT table”). Unlabeled rows come from the Page list.
| Parameter | Value |
|---|
| Configuration | 1 × 2 |
| Coupling ratio | 50/50 |
| Package | ABS module |
| Connector | Without — bare fiber leads for fusion splicing |
| Fiber type | G657A or customized |
| Fiber mode | Singlemode |
| Fiber diameter | 2.0mm / 3.0mm |
| Fiber length | 1m or customized |
| Operating wavelength | 850, 980, 1310, 1480, 1550, 1585nm, or custom |
| Standard FBT windows (FBT table) | 1310±40 / 1550±40 / 1310&1550±40 / 1310&1490&1550±40nm, or customized |
| Insertion loss | ≤3.4dB |
| Insertion loss, 50/50 row (FBT table) | Tap port 2.8–3.6dB / Signal port ≤3.6dB |
| Excess loss (FBT table) | 0.1dB typical |
| Insertion loss uniformity | ≤1.5dB |
| Directivity | ≥55dB (both sources) |
| Polarization dependent loss | ≤0.1dB (Page list) / 0.15dB max (FBT table) |
| Return loss | 55dB |
| Operating temperature | -40~+85°C |
Note 1: coupling-ratio data excludes connectors. This model ships without connectors, so installation adds only splice loss.
Note 2: the Page list offers 1480nm while the FBT triple window is 1310&1490&1550nm — state your exact wavelength on the RFQ and confirm the acceptance figure where sources differ.
Connectors, Fiber Types & Compatibility
This unit ships without connectors on purpose: each 2.0mm lead ends in a fusion splice, making the splitter a permanent part of the cable plant in a closure, splice tray, or distribution box rather than a patched element. Standard fiber is G657A singlemode, which handles tray bend radii; other fibers can be customized. Splicing needs only a fusion splicer, splice sleeves, and tray space for the ABS module.
For connectorized FBT couplers, see the siblings: the 1×3 FBT splitter with FC/APC connectors and the fused biconical taper 1×3–1×N series with LC/UPC.
Applications
- FTTH / PON distribution closures: a permanent spliced 2-way branch at 1310/1550nm that lives inside the closure for its service life — no connectors to clean or fail.
- CATV and RF overlays at 1550nm: return loss 55dB and directivity ≥55dB keep reflections controlled on analog-sensitive links.
- 1+1 line protection: the equal 50/50 split feeds two diverse paths with the same power — an unequal tap would starve the backup leg.
- Test and monitoring access: bare leads splice into a live-route access point; where a small tap is enough, an unequal 70/30 or 90/10 ratio is the better tool.
How to Choose: Ratio, Window, Package, Leads
Split ratio. 50/50 when both legs need equal power — two-way distribution or protection feeds. For a monitor tap, use an unequal ratio — see the 1×3 SC/APC 70:30 / 90:10 FBT coupler; custom ratios sit on the FBT splitter category page.
Wavelength window. Order the window your system uses: 1310nm or 1550nm single, dual 1310&1550nm, or 850/980/1480/1585nm custom for non-PON systems. An FBT coupler is built for its specified windows — not wavelength-flat across 1260–1650nm.
FBT or PLC. At 1×2, FBT gives defined windows, custom ratios, and lower device cost; PLC gives full-band uniform loss and tighter uniformity (comparison below).
Leads. 2.0mm jacket is standard for tray routing; 3.0mm for harsher handling. Standard length 1m, customizable — order enough to reach the splice point without tension.
Acceptance check. Measure IL at the ordered wavelength with a light source and power meter against the table values, and port balance against ≤1.5dB uniformity. Budget planning across split counts: use the splitter loss chart (1×2 to 1×64).
FBT 1×2 Bare vs PLC 1×2 Siblings
The 1×2 split intent spans four BWNFiber pages. This page owns the FBT, no-connector, fusion-splice configuration; PLC siblings serve connectorized or wavelength-uniform needs:
| Page | Technology | Termination | Choose when |
|---|
| This page — FBT 1×2 50/50 bare | FBT, defined windows, custom wavelengths | No connectors, 2.0/3.0mm leads | Permanent splice-in at a known wavelength; custom ratios |
| 1×2 PLC cassette SC/UPC | PLC, 1260–1650nm uniform | SC/UPC, cassette | PON drops plugging into adapter fields; UPC polish |
| 1×2 PLC ABS box SC/APC | PLC, 1260–1650nm uniform | SC/APC, ABS box | PON/FTTH points requiring APC reflectance control |
| 1×2 mini PLC FC/APC | PLC, steel-tube mini module | FC/APC | Tight spaces needing a mini package with FC interfaces |
For other ratios, packages, and custom builds, see the FBT splitter category and the fiber optic splitter overview.
Testing & Quality Control
Optical performance is verified against the specification table — insertion loss, uniformity, directivity, PDL, return loss — at the ordered wavelength window.
Packaging & Ordering Information
Standard supply: 50/50 ratio, G657A fiber, 2.0mm leads, 1m length, no connectors, ABS module. Lead length, fiber diameter (2.0/3.0mm), fiber type, and wavelength are customizable. Packaging quantity and carton details are confirmed per order.
The ordering code decodes the configuration: FBT (fused biconical taper) — 1×2 ports — SM singlemode — 2.0mm leads — Bare (no connectors) — 5050 (50/50 ratio).
Request a Quote
Send your RFQ through the contact page or the form on this page, with these six parameters:
- Split ratio — 50/50 standard, or state the ratio
- Wavelength window — 1310 / 1550 / dual / 850 / 980 / 1480 / 1585nm / custom
- Fiber type — G657A standard, or specify
- Fiber diameter — 2.0mm standard, 3.0mm optional
- Lead length — 1m standard, customized available
- Quantity and any test-report requirements
The FTTx supporting products page covers the closures, trays, and distribution hardware this splitter installs into.
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