1×2 Filter PM Fiber Optic Coupler Low Insertion Loss High Extinction Ratio

This 1*2 Filter PM Fiber Standard Coupler is a high-performance polarization-maintaining (PM) fiber coupler based on Thin-Film Filter (TFF) technology. It is capable of splitting an input optical signal into two output ports according to a specified ratio while maintaining the stability of the optical signal's polarization state. Utilizing high-quality Corning Panda Fiber, this product features low insertion loss, a high extinction ratio, and excellent environmental stability, making it ideally suited for optical communication and photonic systems that demand high precision in power control and superior polarization-maintaining performance. With its compact structure and robust mechanical strength, this device can be widely integrated into fiber lasers, EDFAs, coherent communication systems, and fiber sensing platforms, serving as a critical passive component for achieving high-precision optical power distribution.

*Above specifications are for devices with the connectors.

*The PM fiber and the connector key are aligned to the slow axis, fast axis is blocked

• 1*2 polarization-maintaining coupler structure based on TFF technology
• Utilizes Corning Panda Fiber for stable polarization-maintaining performance
• Typical insertion loss ≤3.8 dB at a 50/50 splitting ratio
• Extinction ratio ≥20 dB
• Return loss ≥50 dB
• Directivity ≥50 dB
• Supports various splitting ratios: 50/50, 10/90, 20/80, 5/95, 1/99
• Supports slow-axis, fast-axis, or dual-axis operation modes
• Available package options: Φ5.5*38 mm or 90*20*10 mm

• EDFA (Erbium-Doped Fiber Amplifiers)
• Optical test and measurement instruments
• Coherent communication systems
• Fiber laser systems
• Fiber sensing systems
• Optical experimental and research platforms