85°C SST Fiber Optic Cable - Fiber In Metal Tube (FIMT) - Communication / Sensing Optical Cable

Aliases: Armored Micro SST Fiber Cable, Rodent-Proof Metal Tube Fiber Cable, Hermetic Stainless Steel Fiber Unit, FIST (Fiber In Steel Tube) Cable, Ultra-Slim Seamless SST Sensing Cable, Single-Layer SST Optical Unit, Utility Gallery Specialty Fiber Cable, Subsea-Rated SST Fiber Sensing Cable, Structural Health Monitoring (SHM) Fiber Cable

1. Product Overview of OFSCN® 85°C Seamless Steel Tube Fiber Cable

The OFSCN® 85°C Seamless Steel Tube Fiber Optic Cable is an industrial-grade protected cable featuring a single-layer seamless stainless steel tube encapsulation. The cable houses high-performance OFSCN® standard communication fibers (Single-mode or Multi-mode) within a high-strength stainless steel barrier. Designed to replace traditional plastic-jacketed cables in harsh industrial environments, it solves issues such as rodent damage, lateral pressure sensitivity, and moisture ingress, providing 100% water vapor shielding and exceptional mechanical durability.

 

2. Technical Parameters of OFSCN® 85°C Seamless Steel Tube Fiber Cable

Key Parameters	Spec A (2.0mm)	Spec B (3.0mm)	Custom Options
Outer Diameter (OD)	2.0 mm	3.0 mm	1/8" (3.175mm) / 1/16" (1.58mm)
Wall Thickness	0.2 mm	0.3 mm	Tailored to requirements
Tube Material	304 SS (Default) / 316L	304 SS (Default) / 316L	304 / 316L Stainless Steel
Theoretical Weight	~8.96 kg/km	~20.14 kg/km	Varies by diameter
Tensile Strength	> 550 N	> 1200 N	Superior mechanical load capacity
Crush Resistance	> 100 MPa	> 100 MPa	Rated for heavy loads & hydrostatic pressure
Operating Temp.	-40 to +85°C	-40 to +85°C	Standard industrial-grade range
Min. Order Qty (MOQ)	1000 Meters	1000 Meters	Ideal for large-scale engineering projects

3. Internal Fiber Configuration of OFSCN® 85°C Seamless Steel Tube Fiber Cable

The cable can be flexibly configured with one or more high-quality OFSCN® communication fibers:

• Single-mode (SM):

Default: OFSCN® G.652D Optical Fiber (General purpose)

Optional: OFSCN® G.657B3 Optical Fiber (Ultra-bend insensitive)

• Multi-mode (MM): OFSCN® MM Optical Fiber (OM2/OM3/OM4 available)
• Connectivity: Compatible with standard FC/PC or FC/APC connectors, or standard fusion splicing.

4. DFOS Compatibility Analysis of OFSCN® 85°C Seamless Steel Tube Fiber Cable

Despite operating in standard temperature ranges, the "Seamless Steel Tube" structure provides unique advantages for Distributed Fiber Optic Sensing (DFOS):

4.1 Distributed Temperature Sensing (DTS) — Raman Scattering

• Industrial Monitoring: Sufficient for environment temperature monitoring in power tunnels, cable trays, or utility galleries.
• Hermetic Shielding: The seamless tube blocks 100% of water vapor, ensuring the fiber does not suffer from long-term attenuation increase due to moisture in damp conditions.

4.2 Distributed Temp. & Strain Sensing (DTSS) — Brillouin Scattering

• Structural Monitoring: The high modulus of 304 stainless steel allows for synchronized deformation with large structures like dams, bridges, and pile foundations.
• High-Pressure Protection: In deep-water hydraulic engineering, the 100 MPa crush resistance ensures the internal fiber remains unaffected by lateral pressure, improving strain measurement accuracy.

4.3 Distributed Acoustic/Vibration Sensing (DAS/DVS) — Rayleigh Scattering

• Rigid Transmission: The metal jacket is highly sensitive to high-frequency vibrations. Compared to soft plastic jackets, the 304 tube transmits external vibrations (digging, intrusion, or leaks) to the internal fiber with much higher fidelity.
• Rodent/Pest Protection: Metal encapsulation provides physical-grade protection against destruction in underground deployments, making it ideal for perimeter security.

5. Sensing Technology Matching Matrix of OFSCN® 85°C Seamless Steel Tube Fiber Cable

Sensing Tech	Principle	Recommended Fiber	Key Advantages
DTS	Raman Scattering	Multi-mode (MM)	Long lifespan, moisture-proof; Ideal for utility gallery monitoring.
DAS / DVS	Rayleigh Scattering	G.652D / G.657B3	High rigidity metal jacket; Superior vibration conduction for security.
BOTDA / R	Brillouin Scattering	G.652D / G.657B3	High crush resistance; Synchronized deformation for structural health.
Communication	Signal Transmission	G.652D / G.657B3	Armor-grade protection; Ensures link stability in harsh conditions.