2x2 Fiber Optic Coupler 850nm 50/50 Polarization Maintaining Fiber Splitter Dual Axis Low Insertion Loss

  2*2 PM Filter 850nm Fiber Coupler This coupler employs a thin-film filtering and fusion splicing process to achieve 50/50 power distribution of one or two input signals in the 850nm±20nm band while maintaining good polarization characteristics. The device features a 2*2 structure and dual-axis working, and defaults to PM780-HP polarization-maintaining fiber, 0.9mm loose tube, 1m pigtail, and FC/UPC connector. The steel tube packaging dimensions are Φ5.5*38mm. It exhibits low typical insertion loss, excellent extinction ratio, and return loss, making it suitable for applications such as beam splitting, beam combining, and monitoring in 850nm polarization-maintaining laser and fiber optic systems.

• Low Insertion Loss, Easier Link Budgeting

    Within an 850nm±20nm operating bandwidth, the insertion loss of the 2*2, 50/50 splitter structure is ≤4.3dB, minimizing the impact on system OSNR and power margin while achieving power distribution. Suitable for multi-stage device cascades or long link applications.

• Excellent Extinction Ratio, Stable Polarization Characteristics

    The extinction ratio of the device is ≥20dB/≥18dB for CR＞5% and CR≤5% respectively. Combined with PM780-HP panda-type polarization-maintaining fiber and precise axial fabrication, it maintains good polarization control in dual-axis operation mode, meeting the signal stability requirements of polarization-sensitive systems.

• High Return Loss, Protecting Pre-amplifier Devices

    Return loss ≥45dB effectively suppresses the impact of end-face reflections on lasers, amplifiers, and precision detectors, reducing multipath interference and noise coupling, and improving long-term system stability and measurement consistency.

• Dual-Axis Working Design, Catering to More Application Scenarios

    Unlike traditional PM couplers that only operate on the slow axis, this product is Dual Axis working, compatible with polarization management in polarization-maintaining links, and better suited for certain 850nm systems requiring dual polarization or with less strict polarization direction limitations, increasing application flexibility.

• Good Power Handling Capacity and Environmental Adaptability

    Maximum optical power ≤500mW, tensile load ≤5N, operating temperature -5～+70℃, storage temperature -40～+80℃, combined with high-reliability packaging technology, allows for long-term stable operation in computer rooms, laboratories, and general engineering environments.

• Package Dimensions

  Standard: Steel tube package Φ5.5*L38mm (ST2 type), compact structure, suitable for internal module or tray mounting.

• Port and Fiber Configuration
  • Port Type: 2*2 structure
  • Operating Wavelength: 850nm, bandwidth ±20nm
  • Tap Ratio: Standard is 50/50 splitter
  • Fiber Type: PM780-HP polarization-maintaining fiber, 0.9mm loose tube
  • Fiber Length: 1.0±0.05m (default), length and sheath can be customized upon ordering (250μm, 0.9mm, 2.0mm, 3.0mm, etc.).
• Connector Type

  Default Configuration: FC/UPC–FC/UPC

  Optional options via ordering information: connectorless, FC/APC, SC/UPC, SC/APC, LC/UPC, LC/APC, or other customized types for easy integration with existing platforms.

• Ordering Information Structure (Brief Explanation)

  Model Format Example:

  Coupler-XXX XXX XX XXX XXXXX XX XX- XX X

  • Port NO: 22 indicates 2*2
  • Wavelength: 850=850nm (also expandable to 1310/1550/980/1064/780nm)
  • Splitting Ratio: 50=50/50, 90=90/10, 99=99/01, etc.
  • Modules Type: ST1/ ST2/ ST3 correspond to different steel pipe sizes
  • Fiber Type & Length: PM780, PM13, PM15, etc. + 02/09/20/30 sheath + 10=1m
  • Com / Port Connector: 0–6 correspond to different connectors (e.g., 1=FC/UPC, 2=FC/APC, etc.)

  Example from the datasheet: PMC-2278050ST3PM7800910-11, which refers to a 2*2 PM Filter 850nm, 50/50 splitter, ST3 steel tube, PM780-HP fiber with 0.9mm white sheath, 1m pigtail, dual-ended FC/UPC, biaxial operation.

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