1x2 TFF Filter PM Fiber Coupler 50/50 1310nm Polarization Maintaining Splitter Low Insertion Loss

  This product is a 1*2 TFF Filter PM Fiber Coupler 50/50 (1*2 Filtered Polarization-Maintaining Fiber Standard Coupler), operating wavelength 1310nm, bandwidth ±40nm. It employs a thin-film filter (TFF) structure and Corning panda-type polarization-maintaining fiber to achieve two 50/50 outputs while maintaining polarization characteristics of one input light. 

• Low Insertion Loss, Budget-Friendly for Links

    Within the 1310nm±40nm range, the maximum insertion loss for 50/50 splitting is ≤3.8dB. Clear upper limits for insertion loss are also given for different splitting ratios such as 20/80, 10/90, 5/95, and 1/99 (e.g., ≤8.2/1.7dB for 20/80, ≤22.2/0.6dB for 1/99), facilitating link power budgeting and solution selection.

• High Extinction Ratio, Excellent Polarization Performance

    The coupler extinction ratio is ≥20dB. It uses Corning Panda polarization-maintaining fiber. The specifications state that PM fiber and connector key alignment is on the slow axis, supporting dual-axis operation. This allows it to maintain polarization in the classic "slow axis operation" mode while also meeting the needs of some dual-polarization applications.

• High return loss and high directivity, suppressing reflections and crosstalk

    Return loss ≥50dB, directivity ≥50dB, effectively reducing the impact of end-face reflections and port-to-port crosstalk on lasers, amplifiers, or high-sensitivity detectors, improving system stability and signal quality.

• Good power and environmental adaptability

    Maximum power handling capacity ≤500mW, operating temperature -10～+65℃, storage temperature -40～+85℃, allowing for long-term stable operation in computer rooms, laboratories, and most engineering environments.

• Multiple Splitting Ratios and Structures Available to Meet Diverse Applications

    In addition to 50/50, the specification sheet provides insertion loss parameters for various splitting ratios, including 20/80, 10/90, 5/95, and 1/99. Customers can flexibly configure these according to their "main link + monitoring/extraction" requirements. Bare fiber, 0.9mm tube, 2.0/3.0mm sheath, and different packaging options are also available, reducing the difficulty of secondary development.

• 250μm Bare Fiber Version: Steel Tube Packaging φ5.5*38mm;
• 0.9mm Loose Tube Version: Steel Tube Packaging φ5.5*38mm;
• 2.0 / 3.0mm Sheath Version: Box Packaging 90*20*10mm.

  The structural diagram on page 2 of the specification shows that the main body consists of a φ5.5*38mm steel tube in the middle, with optical fibers extending from both ends for easy fixation in a tray or frame.

• Fiber Type: Corning Panda PM fiber;
• Standard Pigtail Length: 1.0±0.1m, customizable upon request;
• Sheath Type: 250μm bare fiber / 0.9mm blue loose tube / 2.0mm / 3.0mm sheath optional.

• Standard configuration is LC/UPC, FC/UPC, FC/APC, SC/UPC, SC/APC, LC/APC, etc., can also be customized according to order information;
• Parameters for all versions with connectors are given in the table (note: "Above specifications are for devices with the connectors"), facilitating direct use in link design.

• Spectroscopy and monitoring in EDFA/fiber amplifiers
• Power distribution within fiber optic instruments
• Front-end optical paths in coherent communication systems
• Online power monitoring and tap detection
• Various polarization-maintaining fiber optic sensors and experimental platforms