Core Technologies
How STS engineers performance into every component
Planar Lightwave Circuit (PLC)
PLC splitter chips are fabricated using photolithographic techniques on silicon wafers, achieving splitting uniformity of ≤1.0 dB across all output ports. Unlike fused biconic taper (FBT) couplers, PLC technology scales to 1×64 and beyond while maintaining consistent performance across the full 1260–1650 nm wavelength window.
Thin-Film Filter (TFF) Technology
WDM multiplexers and demultiplexers use cascaded thin-film interference filters deposited to nanometer precision. Each filter layer reflects specific wavelength bands with ≥40 dB channel isolation and ≤0.005 dB/°C thermal drift — critical for CWDM and DWDM metro and long-haul networks.
APC End-Face Geometry
Angled Physical Contact (APC) connectors are polished to an 8° angle, causing back-reflections to scatter away from the fiber core. This achieves return loss ≥65 dB — 15 dB better than UPC — essential for analog CATV, PON amplifier chains, and coherent DWDM systems where reflected light causes noise and instability.
MT Ferrule Multi-Fiber Precision
MTP/MPO connectors use a multi-fiber termination (MT) ferrule with 12 or 24 fiber holes at 250 μm pitch, positioned to ±1 μm lateral accuracy. Precision guide pins ensure fiber-to-fiber alignment across the entire mating interface, enabling parallel optics at 40G, 100G, and 400G without wavelength-domain multiplexing overhead.
Bend-Insensitive Fiber (G.657A2)
ITU-T G.657A2 bend-insensitive fiber uses a trench-assisted refractive index profile, creating a photonic barrier that traps light in the core even at a 7.5 mm bend radius. Attenuation increase is ≤0.1 dB at 10 mm × 10 turns @1550 nm — enabling tight routes in wall ducts, staple-protected runs, and FTTH CPE enclosures.
Gel-Free Dry Water Blocking
Modern ribbon and loose-tube cables use super-absorbent polymer (SAP) tape layers instead of thixotropic gel. Dry water blocking eliminates gel migration at temperature extremes, simplifies mid-span access (no gel cleanup), and ensures IEC 60794-1-2 F5 water penetration compliance — while reducing installation time by up to 40%.
Fiber Type Reference
Key parameters across STS-stocked fiber categories
| Fiber Type | Core/Clad | Atten. @1310 nm | Atten. @1550 nm | Bandwidth | Typical Reach | Primary Use |
|---|---|---|---|---|---|---|
| G.652D (OS2) | 9/125 μm | ≤0.34 dB/km | ≤0.20 dB/km | N/A (SM) | Up to 200 km | Standard SM backbone |
| G.657A2 (OS2 BI) | 9/125 μm | ≤0.36 dB/km | ≤0.22 dB/km | N/A (SM) | Up to 100 km | FTTH, tight-bend routes |
| OM3 (50/125) | 50/125 μm | ≤1.5 dB/km | N/A | ≥2000 MHz·km EMB | 300 m (10G) | Data center, LAN |
| OM4 (50/125) | 50/125 μm | ≤1.5 dB/km | N/A | ≥4700 MHz·km EMB | 150 m (100G) | High-speed data center |
| OM5 (WBMMF) | 50/125 μm | ≤1.5 dB/km | ≤3.5 dB/km | ≥28000 MHz·km EMB | 150 m (400G SWDM4) | Next-gen data centers |
Quality at Every Stage
Every STS connector undergoes end-face geometry inspection using an automated interferometer — checking radius of curvature, apex offset, and fiber height — before a 100% insertion loss test at 1310 nm and 1550 nm. Rejects are reworked or scrapped; no product leaves the factory without passing both optical and mechanical tests.
Cable assemblies are tensile-tested, flex-cycle-tested to 500 cycles, and thermally shocked from -40°C to +75°C. OTDR traces are archived per IEC 61746 for each shipped cable assembly, providing customers with traceable baseline data for life-of-network maintenance.