Gyfty Single-mode Fiber Optic Cable

Why Single-Mode in a GYFTY Shell?

Single-mode fiber (ITU-T G.652D) transmits light through a 9 μm core so narrow that only one propagation mode survives - and that constraint is exactly what gives it reach. Attenuation drops to 0.36 dB/km at 1310 nm and 0.22 dB/km at 1550 nm, so a signal can travel 80–120 km between regeneration points. The GYFTY stranded loose-tube jacket exists to protect that performance budget across decades of outdoor service.

By pairing single-mode fiber with FRP strength members and a dry water-blocking core, GYFTY ensures factory-measured optical characteristics stay stable through installation, temperature cycling, and mechanical loading. The cable introduces no micro-bending loss that would eat into your link budget.

Where Single-Mode GYFTY Earns Its Place

Long-Haul Backbone Links: Carrier inter-city routes rely on the 1550 nm window for maximum distance. GYFTY's loose-tube buffering keeps fiber strain below 0.1%, preventing the wavelength-dependent attenuation drift that tight-buffered designs suffer during thermal expansion.

Campus and Industrial Backbones: University campuses, refinery complexes, and logistics hubs spanning 2–15 km fall squarely into single-mode's sweet spot - far beyond the ~500 m reach of multimode OM4 at 10G, yet served by a cable under 16 mm in diameter.

CWDM/DWDM Upgrade Path: Single-mode fiber supports wavelength-division multiplexing. A 24-fiber GYFTY cable carrying 18 CWDM channels per fiber pair becomes a 216-channel pipeline - all within one compact reel.

5G Fronthaul and Midhaul: Cell site densification demands fiber that handles 25G and 100G today with headroom for 400G tomorrow. Single-mode GYFTY feeds tower-mounted radios through existing duct routes without new cable pulls.

What the Construction Does for Signal Integrity

Strain-Free Fiber Path: SZ-stranded tubes apply a controlled excess fiber length of roughly 0.1–0.2% relative to the tube. This slack absorbs thermal contraction and tensile load, so the fiber never sees strain above its proof-test threshold.

Gel-Free Dry Core: Water-blocking yarn and swelling tape replace traditional filling gel. Beyond cleaner splicing, the dry core avoids the refractive-index contamination that gel migration can cause at tube ends over long service periods.

FRP Strength Without Metal: Non-metallic strength members mean no corrosion products, no galvanic reactions at splice closures, and no conductive path to couple ground-loop noise into adjacent electronics - all of which can degrade bit-error performance over years.

Temperature-Stable Attenuation: Factory OTDR traces at −40 °C and +70 °C show attenuation variation under 0.02 dB/km. The cable will not develop seasonal loss spikes that trigger false alarms in remote monitoring systems.

Advantages at a Glance

Lowest attenuation in its class: 0.36/0.22 dB/km at 1310/1550 nm - matched only by premium fibers at higher cost

Future-proof bandwidth: 10G today, 400G with current transceivers, and DWDM overlay without cable replacement

Zero-gel splicing: 40% faster fusion cycles; no alcohol cleanup of tube interiors

Compact cross-section: 12–288 fibers in diameters from 9 to 16 mm - fits congested ducts

25-year optical stability: Proof-tested with strain margin preserved for installation and service life

Key attributes

Packaging and delivery

Lead time

Packaging & Shipping

FAQ

Q1: What is the difference between G.652D and G.657A fiber in this cable?

G.652D is the standard single-mode fiber optimized for 1260–1625 nm with low water-peak attenuation. G.657A adds improved bend tolerance (max 0.4 dB loss at a 10 mm bend radius) for tight spaces. Both are available - G.652D for backbone routes, G.657A for drop and intra-building segments.

Q2: How far can I transmit without a repeater?

At 1550 nm with 0.22 dB/km attenuation and 0 dBm launch power, you can reach roughly 100 km at 10G before requiring optical amplification. At 1310 nm the practical limit is around 40 km. Exact distance depends on connector loss, splice count, and receiver sensitivity.

Q3: Can I use this cable for both single-mode and multimode runs?

No. The two fiber types have different core diameters (9 μm vs 50 μm) and are not interchangeable. Hybrid GYFTY configurations with both fiber types in separate tubes are available for mixed-run projects.

Q4: What connector types are compatible?

SC/UPC, SC/APC, LC/UPC, LC/APC, and FC/APC all work with the single-mode fibers in this cable. We can pre-terminate one or both ends with any combination and provide OTDR test traces for each assembly.

Q5: How does the dry water-blocking system compare to gel-filled tubes?

Dry water-blocking uses swelling yarn and tape that expand on water contact, sealing the tube without flowing compound. Benefits include faster splicing (no gel cleanup), cleaner closures, lower shipping weight, and no risk of gel drying out or migrating over the cable's service life.