# 300℃ Polyimide Large-Core Fiber - Pure Silica Multimode Large-Core Optical Fiber - Laser Delivery/Sensing Fiber Optic - Picture Parameters - Manufacturer Brand Price - DCYS - ofscn.org

**URL:** <https://forum.ofscn.net/t/300-polyimide-large-core-fiber-pure-silica-multimode-large-core-optical-fiber-laser-delivery-sensing-fiber-optic-picture-parameters-manufacturer-brand-price-dcys-ofscn-org/1922>\
**Category:** Official Tech Inquiry & Product Q&A\
**Created:** [June 12, 2026, 2:04am UTC](https://forum.ofscn.net/t/300-polyimide-large-core-fiber-pure-silica-multimode-large-core-optical-fiber-laser-delivery-sensing-fiber-optic-picture-parameters-manufacturer-brand-price-dcys-ofscn-org/1922 "2026-06-12T02:04:55Z")\
**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:** [June 12, 2026, 2:04am UTC](https://forum.ofscn.net/t/300-polyimide-large-core-fiber-pure-silica-multimode-large-core-optical-fiber-laser-delivery-sensing-fiber-optic-picture-parameters-manufacturer-brand-price-dcys-ofscn-org/1922/1 "2026-06-12T02:04:56Z")

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Iven | www.ofscn.org Last Updated: 07 June 2026

This product is a high-performance optical fiber product developed and manufactured by Beijing Dacheng Yongsheng Technology Co., Ltd. This product is specifically engineered for extreme temperature environments and versatile industrial optical signal or energy transmission requirements. It features a pure silica core, a fluorine-doped silica cladding, and an outer coating layer made of polyimide (PI), which offers exceptional thermal stability.

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This is a companion discussion topic for the original entry at [https://www.ofscn.org/optical-fibers/300c-polyimide-large-core-fiber.html](https://www.ofscn.org/optical-fibers/300c-polyimide-large-core-fiber.html)

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**Author:** ![OFSCN\_PS\_Eng](https://forum.ofscn.net/letter_avatar_proxy/v4/letter/o/839c29/32.png) [@OFSCN\_PS\_Eng](https://forum.ofscn.net/u/OFSCN_PS_Eng)\
**Post date:** [June 12, 2026, 2:05am UTC](https://forum.ofscn.net/t/300-polyimide-large-core-fiber-pure-silica-multimode-large-core-optical-fiber-laser-delivery-sensing-fiber-optic-picture-parameters-manufacturer-brand-price-dcys-ofscn-org/1922/2 "2026-06-12T02:05:20Z")

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Welcome to the official technical discussion and inquiry thread for the [OFSCN® Polyimide Large-Core Optical Fiber](https://www.ofscn.org/optical-fibers/300c-polyimide-large-core-fiber.html) .

Beijing Dacheng Yongsheng Technology Co., Ltd. (OFSCN®) has developed this high-temperature, large-core pure silica fiber specifically for demanding environments such as high-power laser delivery, optical energy transmission, spectroscopy, and advanced fiber sensing.

### Technical Overview & Key Parameters

 ![OFSCN® Polyimide Large-Core Optical Fiber](https://forum.ofscn.net/uploads/default/original/1X/596c6107a14110c5451441273f46a1ab31866f10.jpeg)

- **Operating Temperature Range** : -200\ ^\circ\text{C} to 350\ ^\circ\text{C} (or ultra-cryogenic down to -270\ ^\circ\text{C} to 350\ ^\circ\text{C} ).
- **Wavelength Range** : Excellent transmission from 200\ \text{nm} to 2400\ \text{nm} (covering UV, VIS, and NIR spectrums).
- **Standard Core/Cladding/Coating Dimensions** :
  - 105 / 125 / 155\ \mu\text{m}
  - 200 / 220 / 245\ \mu\text{m}
  - 300 / 330 / 360\ \mu\text{m}
  - 400 / 440 / 470\ \mu\text{m}
  - 600 / 660 / 700\ \mu\text{m}
  - 800 / 880 / 910\ \mu\text{m}

- **Protective Tubing Options** : Can be further customized with seamless stainless steel tubes, ETFE, PFA loose tubes, or tight buffer packaging.

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### Need Help Finding the Right Specification?

If you are considering this fiber for your research, system design, or industrial engineering applications, we are glad to help you evaluate the best match. To help us narrow down the ideal technical options, could you please tell us:

1. **What is your target working wavelength or light source type** (e.g., UV spectroscopy, high-power laser transmission, or NIR optical sensing)?
2. **What is the typical operating temperature and environmental constraints** (such as chemicals, tight bend requirements, or mechanical stress) the fiber will encounter?

Please reply to this thread with your application details, and we can discuss the most suitable configurations!

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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:** [June 12, 2026, 2:05am UTC](https://forum.ofscn.net/t/300-polyimide-large-core-fiber-pure-silica-multimode-large-core-optical-fiber-laser-delivery-sensing-fiber-optic-picture-parameters-manufacturer-brand-price-dcys-ofscn-org/1922/3 "2026-06-12T02:05:20Z")

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