Main Specialty Fiber Patchcords

(1) Large Core Fiber Patchcords (Energy / Laser Transmission)

• Features: Core diameter much larger than standard multi-mode fibers (50/125, 62.5/125), available in 100μm, 200μm, 400μm, 600μm, 1000μm, etc.
• Typical types: Silica large-core multi-mode fibers (e.g., 400/440μm, 600/660μm)
   
  The 400×400μm rectangular fiber you mentioned earlier also falls into this category of large-core specialty fibers.
• Applications: Laser processing, medical lasers, spectrometers, sensing, high-power optical transmission.
• (2) Polarization-Maintaining (PM) Fiber Patchcords
• Features: Maintain the polarization state of light; common types include Panda, Bow-tie, and Elliptical cladding.
• Typical connectors: FC/PC, FC/APC, SC/APC, SMA905, etc.
• Applications: Fiber optic gyroscopes, interferometers, quantum communication, coherent detection, fiber sensing.
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• (3) Single-mode / PM Hybrid & Mode Control Types
• Few-mode fiber (FMF)
• Hollow-core fiber (HC-PCF, photonic crystal fiber): Low nonlinearity, low latency, used for femtosecond lasers and high-power transmission.

2. Classification by Wavelength / Material

(1) Mid-Infrared Fiber Patchcords

Materials: Fluoride fiber (ZBLAN), chalcogenide fiber, silicon fiber.

• Wavelength range: 2μm–16μm mid-infrared.
• Applications: Gas detection, infrared spectroscopy, medical treatment, thermal imaging, environmental monitoring.

(2) UV / Visible Enhanced Fiber

• High UV transmission (e.g., 190nm–400nm).
• Applications: UV curing, spectral analysis, photolithography, biomedical detection.

(3) High-Temperature / Radiation-Resistant Fiber

• High-temperature resistance: Operable at 150°C, 200°C, or even higher temperatures.
• Radiation resistance: For nuclear industry, aerospace, high-energy physics experiments.
• Applications: Industrial furnace temperature monitoring, nuclear facilities, aerospace sensing.

3. Classification by Specialized Connectors / Structures

(1) Industrial / Instrument-Specific Connectors

• SMA905: Commonly used in spectrometers, medical equipment, and laser devices (the type you mentioned earlier).
• D80, SMA906, ST, high-return-loss versions of FC/APC.
• Applications: Scientific instruments, medical lasers, industrial detection.

(2) High-Power / Water-Cooled / Armored Patchcords

• Armored: Metal armored, rodent-proof, tensile and bending resistant.
• High-power: End-face treatment, coating, beam expanding ends to prevent end-face burnout.
• Applications: Laser cutting / welding, industrial automation, field sensing.

(3) Special-Shaped Fiber

• Rectangular fiber (e.g., 400×400μm)
• Flat fiber, multi-core fiber (MCF, multi-core single-mode / multi-mode)
• Applications: High-power coupling, imaging bundles, parallel optical transmission.