1550nm Polarization Maintaining Fiber Splitter 25:25:25:25 Low Insertion Loss

  This product is a 4*4 Filter PM FBT Coupler (4*4 Polarization-Maintaining Fused Taper Coupler), operating in the 1550nm±15nm wavelength band. It can split one or more input beams into 4 equal-ratio 25:25:25:25 outputs while maintaining polarization characteristics. The device utilizes Corning panda-type polarization-maintaining fiber and filter-type FBT technology, exhibiting typical low insertion loss, high extinction ratio, excellent return loss, and good directivity, making it suitable as a power distribution and monitoring node in multi-channel polarization-maintaining systems. The standard module size is 100*80*10mm, with a pigtail length of 1.0±0.1m. It supports various connector configurations such as FC/APC and FC/UPC, facilitating easy integration into EDFA, fiber optic instruments, coherent communication, and sensing equipment.

• 4*4 Equal Distribution, Simpler Multi-Channel Structure

    A single module can achieve uniform 25:25:25:25 beam splitting across 4 ports, suitable as a centralized distribution unit for multi-output, multi-monitor, or multi-node optical paths, reducing the additional losses and wiring complexity caused by multi-stage couplers.

• Low Insertion Loss and Low Redundant Loss

    Within the 1550nm±15nm range, the maximum single-end insertion loss is ≤7.5dB, and the redundant loss is ≤1.2dB, which helps control overall link loss, retains more OSNR and power margin, and facilitates subsequent amplification and detection.

• High Extinction Ratio and Strong Polarization Maintenance

    The extinction ratio is ≥20dB, which, combined with panda-type polarization-maintaining fiber, ensures that the output light maintains a stable polarization state in the system. Connector key alignment with the slow axis facilitates a unified polarization reference direction for the entire system, reducing polarization-related noise and power fluctuations.

• High Return Loss and High Directivity, Reducing Reflection and Crosstalk

    Return loss ≥50dB and directivity ≥50dB effectively suppress end-face reflections and port-to-port crosstalk, protecting the pre-amplifier, amplifier, and precision detector, and improving long-term system stability.

• Good Power and Environmental Adaptability

    Maximum optical power handling capacity ≤500mW, operating temperature -5～+75℃, storage temperature -40～+85℃, meeting the long-term online operation requirements of computer rooms, laboratories, and general industrial environments. Note: With connectors, the maximum power drops to 50mW, insertion loss increases by approximately 0.3dB, return loss decreases by approximately 5dB, and extinction ratio decreases by approximately 2dB. Allow for margins in link design budgets.

• Module Dimensions
  • Standard Box Package: 100*80*10mm, flat profile for easy direct mounting to 1U/2U chassis trays or the base plate of the entire unit.
• Fiber Optic and Pigtail Configuration
  • Fiber Optic Type: Corning Panda Polarization Maintaining Fiber;
  • Standard Pigtail Length: 1.0±0.1m, other lengths can be customized according to project requirements;
  • Optional Sheaths:
    • 02 = 250μm Bare Fiber
    • 09 = 0.9mm Loose Tube
    • 20 = 2.0mm Sheath
    • 30 = 3.0mm Sheath
    • XX = Other Custom Structures.
• Connector and Axial Alignment
  • Standard Connector: FC/APC or FC/UPC, also available in SC/UPC, SC/APC, LC/UPC, LC/APC, or connectorless versions;
  • All PM models default to connector key alignment with the slow axis, facilitating quick identification of polarization direction during installation and maintenance.
• Ordering Information Example
  • Model Example: PMCF-4415525PS0910-22(S)
  • 4*4 PM FBT Coupler, 1550nm, 25/25/25/25 Splitter, PS=100*80*10 cartridge module, 09=0.9mm tube, 10=1m pigtail, 22=Dual-ended FC/APC, S=Class specification.

• EDFA / Fiber Optic Amplifier
• Fiber Optic Instrument
• Coherent Communication
• Power Monitoring
• Fiber Optic Sensor