PDK81601-1SMF Buoyant Fiber Optic Cable – Single-Mode Fiber, PE Sheath, 3-Layer LCP 1500D Braid, 900KG Tensile, For Subsea ROV & Observatory Networks

This PDK81601 buoyant fiber optic cable is specifically engineered for the most demanding underwater communication and telemetry applications, including ROV/AUV tethers, subsea observatory backbones, acoustic sensor arrays, and oceanographic data collection systems. It integrates a high‑performance single‑mode optical fiber (1SMF) core within a lightweight, buoyant construction that delivers near‑neutral to positive flotation, preventing the cable from sinking and reducing the risk of snagging on seabed obstacles. The cable features an ultra‑compact outer diameter (approx. 4‑5 mm) for minimal drag and easy storage, and can be supplied in continuous lengths up to 10,000 meters – eliminating intermediate splices and ensuring uninterrupted data integrity.

Model number

PDK81601-1SMF

Specification

1SMF

Braiding material

LCP1500D

Sheath material

PE

Sheath outer diameter (mm)

6.3±0.3mm

Sheath color

yellow

Tensile Strength

900KG

Temperature range

• 40-105℃

Water pressure resistance

10MPA

All optical and strength elements are protected by a PE (Polyethylene) sheath, offering excellent dielectric properties, very low moisture absorption, and stable performance in harsh marine environments. The cable is reinforced with a 3‑layer LCP (Liquid Crystal Polymer) 1500D braid – a high‑strength, low‑creep, ultra‑low‑moisture‑absorption material that provides exceptional tensile capacity while maintaining a lightweight profile. This triple‑layer LCP braid delivers a 900 kg breaking strength, enabling safe deployment and retrieval in deep‑water operations with moderate to high tension loads. The combination of the PE sheath and the 3‑layer LCP braid ensures durability, flexibility, and resistance to kinking during handling, while the inherent low density of both materials contributes to the cable's buoyant characteristics.

Key Features – Single-Mode Fiber, PE Sheath, 3-Layer LCP 1500D Braid, 900KG Tensile

Single‑mode optical fiber (1SMF) – 9/125 µm core for ultra‑high‑bandwidth, low‑attenuation data transmission, ideal for real‑time HD video, sonar, telemetry, and control signals with complete immunity to electromagnetic interference.

900 kg tensile strength – triple‑layer LCP braid (1500 denier per layer) provides exceptional breaking load capacity, ensuring safe handling, deployment, and recovery in strong currents and deep‑water conditions.

PE sheath – rated -40°C to +105°C; offers negligible moisture absorption, excellent dielectric strength, and resistance to seawater, acids, and alkalis, ensuring long‑term reliability under continuous immersion.

3‑layer LCP 1500D braid – liquid crystal polymer fibers deliver high specific strength, minimal creep, and ultra‑low moisture absorption (0.04%), maintaining mechanical integrity over decades of service.

Buoyant construction – optimized material selection (PE + LCP) provides near‑neutral to positive buoyancy in seawater, reducing drag on subsea vehicles and simplifying flotation management.

Compact & flexible – despite the high tensile rating, the cable maintains a small diameter and excellent flexibility, facilitating easy spooling, handling, and termination.

Ideal For

ROV and AUV tether systems requiring lightweight, high‑strength fiber optic links with controlled buoyancy

Subsea observatories and cabled seafloor networks for real‑time environmental monitoring

Underwater acoustic hydrophone arrays and sonar systems needing EMI‑immune data transmission

Oceanographic research and deep‑sea exploration with long‑distance, splice‑free fiber runs

Offshore energy and defense applications demanding reliable underwater communication with high pull strength

Military surveillance and expendable tethers where buoyancy and tensile capacity are critical

Any underwater application requiring a single‑mode fiber optic link + 900kg tensile + buoyant/lightweight characteristics

Conclusion

This PDK81601‑1SMF buoyant fiber optic cable delivers an exceptional combination of optical performance, mechanical strength, and controlled flotation. The integration of a single‑mode fiber core, PE sheath, and a 900‑kg‑rated 3‑layer LCP 1500D braid ensures reliable, high‑bandwidth transmission with extreme durability and near‑neutral buoyancy. It is an ideal solution for ROV systems, oceanographic research, and underwater defense networks.