4×4 Filter PM FBT Coupler 4×4 Filter Type Polarization Maintaining FBT Coupler For EDFA

This 4*4 Filter PM FBT Coupler is a high-performance polarization-maintaining (PM) fiber optic device based on FBT (Fused Biconical Taper) technology. It is designed to evenly distribute an input optical signal across four output ports, achieving a high-precision splitting ratio of 25:25:25:25. Manufactured using Corning Panda polarization-maintaining fiber, the product effectively preserves the polarization state of the optical signal, thereby minimizing polarization crosstalk and link loss. It is ideally suited for applications demanding high levels of polarization stability, power distribution uniformity, and system reliability. Technical specifications indicate that this product features low insertion loss, high extinction ratio, high return loss, and high directivity. Its standard operating wavelength is 1550nm, with support available for customized wavelengths such as 980nm, 1064nm, and 1310nm. The standard ABS box package measures 100*80*10mm; the device supports various fiber configurations—including 250μm bare fiber, as well as 0.9mm or 2.0mm jacketed cables—facilitating easy integration into amplifier modules, laser systems, and various OEM photonic equipment.

With connectors, the handling power is 50mW only, IL is 0.3dB higher, RL is 5dB lower, and ER is 2dB lower. Connector key is aligned to slow axis.

• 4*4 Equal-Ratio Splitting (Splitting Ratio: 25:25:25:25)
• Utilizes Corning Panda Polarization-Maintaining Fiber
• Typical Insertion Loss: ≤7.5dB
• Maximum Excess Loss: ≤1.2dB
• Extinction Ratio: ≥20dB
• Return Loss: ≥50dB; Directivity: ≥50dB
• Maximum Optical Power Handling: Up to 500mW
• Supports Standard 1550nm Wavelength; Customization Available for 980/1064/1310nm
• Operating Temperature: -5℃ to +75℃; Storage Temperature: -40℃ to +85℃
• Supports Various Connector and Packaging Customizations

• EDFA (Erbium-Doped Fiber Amplifiers)
• Fiber Laser Systems
• Coherent Communication Systems
• Fiber Optic Sensing and Monitoring
• Optical Instrumentation and Test Systems
• Scientific Research and Experimental Platforms