ST/UPC Bare Fiber Adapter – Quick-Connect Solution for Fiber Testing and Temporary Connections
The ST/UPC Bare Fiber Adapter is a specialized testing tool designed for temporary fiber optic connections. It provides a simple and effective way to connect stripped and cleaved bare optical fibers directly to standard ST/UPC interfaces-without the need for permanent connector termination or fusion splicing. This adapter is essential for field testing, network maintenance, laboratory verification, and emergency restoration where fast, reliable temporary connections are required. The adapter's ST/UPC interface provides a return loss of ≥50dB, minimizing back reflection for stable measurement results.
Key Features
Quick Temporary Connection
Connect bare fibers directly to ST test interfaces after stripping and cleaving
Eliminates the time-consuming process of splicing jumpers or assembling connectors for testing purposes
Ideal for field technicians performing on-site functional testing without permanent connectors
Easy to Use and Reusable
Simply peel, clean, and cleave the fiber, then insert it into the adapter for an instant connection
Reusable design with ≥1000 mating cycles reduces consumable costs
Broken fibers can be removed with piano wire, allowing hundreds of insertions
Low Insertion Loss
Typical insertion loss: ≤0.2dB (UPC grade)
Maximum insertion loss: ≤1.0dB under all conditions
Return loss: ≥50dB for UPC polish
Durable and Robust Construction
Metal housing (zinc alloy nickel-plated) provides robust protection for field use
Zirconia ceramic alignment sleeve ensures precise fiber core alignment and long-term stability
Epoxy-free ferrule and fiber through-hole design-no adhesive residue
Versatile Fiber Compatibility
Accommodates 125μm ~ 127μm cladding diameter bare fiber
Compatible with 250μm and 900μm coated fibers
Available for both singlemode (9/125μm) and multimode applications
Specifications
| Parameter | Specification |
|---|---|
| Connector Type | ST/UPC |
| Connector Shape | Square |
| Fiber Mode | Singlemode (9/125μm) or Multimode (50/125μm / 62.5/125μm) |
| Polish Type | UPC (Ultra Physical Contact) |
| Housing Material | Metal (zinc alloy nickel-plated) |
| Sleeve Material | Zirconia Ceramic |
| Compatible Cladding Diameter | 125μm ~ 127μm |
| Insertion Loss | ≤0.2dB (typical) / ≤1.0dB (max) |
| Return Loss | ≥50dB (UPC) |
| Repeatability | ≤0.2dB |
| Exchangeability | ≤0.2dB |
| Mating Durability | >1,000 cycles |
| Operating Temperature | -10°C to 70°C |
| Storage Temperature | -40°C to 85°C |
| Humidity | 95% RH |
| Compliance | RoHS |
How to Use
Strip the fiber coating (15-20mm) to expose the bare fiber
Clean the bare fiber carefully with lint-free wipes and alcohol
Cleave the fiber end face using a precision fiber cleaver
Press the adapter button/mechanism to open the clamping system
Insert the bare fiber through the insertion hole until it extends 5-6mm beyond the ferrule
Release the button to secure the fiber
Cut the extended fiber portion using a scribe or cleaver
Connect the ST/UPC end to your test equipment
Applications
| Application Area | Description |
|---|---|
| Fiber Optic Testing | Connecting bare fibers to OTDRs, power meters, light sources, and talk sets without permanent connectors |
| Field Installation | Testing installed cable prior to permanent termination |
| Network Maintenance & Restoration | Quick temporary connections for emergency repairs and system restoration |
| Telecommunications Systems | In-situ functional testing in WANs, LANs, and telecom networks |
| Laboratory Experiments | Fiber optic research and component testing |
| Production Line Inspection | Quality control testing for patch cords and optical devices |
| CATV Systems | Signal testing in cable television infrastructure |
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