This 4*4 Filter PM Coupler is a high-performance passive optical device based on polarization-maintaining (PM) fiber. It evenly distributes an input optical signal across four output ports according to a preset ratio, achieving a stable splitting ratio of 25:25:25:25. The product utilizes high-quality Corning Panda PM fiber and combines Thin-Film Filter (TFF) technology with precision optical design. This approach enables multi-channel power distribution while maintaining the stability of the optical signal's polarization state, thereby minimizing transmission losses and interference caused by random polarization fluctuations. Specifications indicate that this product features low insertion loss, low excess loss, high extinction ratio, high return loss, and excellent environmental stability, making it ideally suited for applications with stringent requirements regarding polarization consistency, power uniformity, and system reliability.

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: ≤7.5 dB
• Maximum Excess Loss: ≤1.2 dB
• Extinction Ratio: ≥20 dB
• Return Loss: ≥50 dB; Directionality: ≥50 dB
• Maximum Optical Power Handling: 300 mW
• Supports Standard 1550 nm Wavelength; Customization Available for 1310/980/1064 nm
• Operating Temperature: -5°C to +75°C; Storage Temperature: -40°C to +85°C
• Supports Customization of Various Package Structures and Connectors

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