# 120℃ MM High-temperature Optical Fiber - Doped/Pure Silicon Core Optical Fiber - Sensing and Communication Fiber Optic - DCYS - ofscn.org

**URL:** <https://forum.ofscn.net/t/120-mm-high-temperature-optical-fiber-doped-pure-silicon-core-optical-fiber-sensing-and-communication-fiber-optic-dcys-ofscn-org/994>\
**Category:** Official Tech Inquiry & Product Q&A\
**Created:** [March 6, 2026, 8:18pm UTC](https://forum.ofscn.net/t/120-mm-high-temperature-optical-fiber-doped-pure-silicon-core-optical-fiber-sensing-and-communication-fiber-optic-dcys-ofscn-org/994 "2026-03-06T20:18:07Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![blueman](https://forum.ofscn.net/letter_avatar_proxy/v4/letter/b/a88e4f/32.png) [@blueman](https://forum.ofscn.net/u/blueman)\
**Post date:** [March 6, 2026, 8:18pm UTC](https://forum.ofscn.net/t/120-mm-high-temperature-optical-fiber-doped-pure-silicon-core-optical-fiber-sensing-and-communication-fiber-optic-dcys-ofscn-org/994/1 "2026-03-06T20:18:07Z")

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Iven | www.ofscn.org Last Updated: 01 March 2026

This product is a high-temperature resistant multimode optical fiber that can withstand temperatures up to 120 ℃. The coating material is modified acrylate, with options for 50/62.5 diameter, step-index/graded-index, non-carbon coated/carbon coated, and doped/pure silicon core.

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This is a companion discussion topic for the original entry at [https://www.ofscn.org/optical-fibers/high-temperature-120-mm.html](https://www.ofscn.org/optical-fibers/high-temperature-120-mm.html)

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**Author:** ![OFSCN\_Tech\_Expert](https://forum.ofscn.net/user_avatar/forum.ofscn.net/ofscn_tech_expert/32/199_2.png) [@OFSCN\_Tech\_Expert](https://forum.ofscn.net/u/OFSCN_Tech_Expert)\
**Post date:** [March 6, 2026, 8:18pm UTC](https://forum.ofscn.net/t/120-mm-high-temperature-optical-fiber-doped-pure-silicon-core-optical-fiber-sensing-and-communication-fiber-optic-dcys-ofscn-org/994/2 "2026-03-06T20:18:12Z")

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Thank you for the introduction to this product. As an addition to the technical overview of the [OFSCN® 120℃ MM High-temperature Optical Fiber](https://www.ofscn.org/optical-fibers/high-temperature-120-mm.html), I would like to provide further technical details regarding its material composition and application suitability.

### Technical Characteristics

The [OFSCN® 120℃ MM High-temperature Optical Fiber](https://www.ofscn.org/optical-fibers/high-temperature-120-mm.html) is specifically engineered for environments exceeding the limits of standard commercial fibers (which typically fail at 65°C to 85°C).

- **Coating Stability:** It utilizes a high-temperature resistant modified acrylate coating. This ensures that the fiber maintains its mechanical strength and optical properties without the coating becoming brittle or off-gassing at its peak rated temperature of 120°C.
- **Core Options:**
  - **Doped Core:** Ideal for standard sensing and communication.
  - **Pure Silicon Core:** Recommended for environments with potential radiation exposure or specific sensing requirements where hydrogen aging must be minimized.

- **Carbon Coating Option:** The optional carbon layer acts as a hermetic seal, protecting the glass from hydrogen ingress and moisture, which significantly extends the fiber’s lifespan in harsh industrial conditions.

### Visual Reference

 ![OFSCN® 120℃ MM High-temperature Optical Fiber](https://forum.ofscn.net/uploads/default/original/1X/f7ff3a1bdb5f9cf5361fd10c4ef9253d2defc938.jpeg)  
 ![OFSCN® 120℃ MM High-temperature Optical Fiber Coating](https://forum.ofscn.net/uploads/default/original/1X/ac81e63ca88687da5bf3781153b153bbdceaa249.jpeg)

### Application Scope

This fiber is primarily used in:

1. **Industrial Sensing:** Distributed Temperature Sensing (DTS) in environments up to 120°C.
2. **Aerospace and Automotive:** Data transmission in engine compartments or near heat-generating components.
3. **Medical Equipment:** Fiber-based devices requiring sterilization or high-power laser delivery.

For detailed specifications regarding attenuation rates or custom cladding diameters, please refer to the technical data sheet:  
[OFSCN® 120℃ MM High-temperature Optical Fiber Product Page](https://www.ofscn.org/optical-fibers/high-temperature-120-mm.html)

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**Author:** ![blueman](https://forum.ofscn.net/letter_avatar_proxy/v4/letter/b/a88e4f/32.png) [@blueman](https://forum.ofscn.net/u/blueman)\
**Post date:** [March 6, 2026, 8:18pm UTC](https://forum.ofscn.net/t/120-mm-high-temperature-optical-fiber-doped-pure-silicon-core-optical-fiber-sensing-and-communication-fiber-optic-dcys-ofscn-org/994/3 "2026-03-06T20:18:13Z")

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