1x2 Fiber Optic Coupler 50/50 1310nm Polarization Maintaining Fiber Coupler Low Insertion Loss

  This product is a 1*2 PM Filter Coupler 50/50 (1*2 filter-type polarization-maintaining fiber coupler, 50/50 beam splitter), operating at a wavelength of 1310nm, bandwidth ±30nm. It utilizes PM13-U25D panda-type polarization-maintaining fiber and a filtering structure to split one input beam into two equally distributed 50/50 output beams while maintaining polarization characteristics. It typically features low insertion loss, high extinction ratio, and excellent return loss and directivity, making it suitable as a fundamental beam splitter in a 1310nm polarization-maintaining system for main link power distribution, monitoring taps, or multi-channel signal processing.

• Low Insertion Loss, Ample System Margin
    Within a 1310nm±30nm operating bandwidth, the insertion loss of a 1*2 50/50 splitter is ≤3.6 dB. Combined with a typical low redundancy loss design, it achieves equal splitting while minimizing the impact on link OSNR and power budget, making it suitable for multi-stage device cascades and medium-to-long-distance applications.
• High Extinction Ratio, Strong Polarization Maintenance
    The device extinction ratio is ≥20 dB. Using PM13-U25D Panda polarization-maintaining fiber, and with the specifications clearly stating that connector key alignment is on the slow axis, it can stably maintain the polarization state in the system, significantly reducing polarization-dependent power fluctuations and coherent noise. It is particularly suitable for polarization-sensitive coherent communication, interferometry, and polarization-maintaining amplifier applications.
• High Return Loss and High Directivity, Suppressing Reflection and Crosstalk
    With a return loss ≥50 dB and directivity ≥50 dB, it effectively suppresses end-face reflections and port-to-port crosstalk, protecting the pre-stage laser, amplifier, and precision detector, and improving the overall signal-to-noise ratio and long-term stability.
• Good Power Handling Capability and Environmental Adaptability
    With a maximum optical power handling capacity ≤300 mW, an operating temperature range -5～+65 ℃, and a storage temperature range -40～+80 ℃, it meets the requirements for long-term online operation in communication equipment rooms, laboratories, and most engineering environments, making it suitable for mass deployment by equipment manufacturers and system integrators.
• Clear Selection Logic, Compatible with Multiple Specifications and Expansion
    While this page primarily promotes the 1310nm, 50/50, 1*2 models, the entire PMFCP series also supports wavelengths such as 1480/1550/980/1064/780 nm, and splitting ratios such as 90/10, 95/5, 99/1, and can be expanded to a 2*2 structure. Customers can flexibly select parameters such as the number of ports, operating wavelength, splitting ratio, package type, sheath, and connectors by ordering model, facilitating the design of multiple models on a unified platform.
• Predictable Performance Changes with Connectors, Facilitating Link Design
    The specifications clearly state that the version with connectors increases insertion loss (IL) by approximately 0.3 dB, reduces return loss (RL) by approximately 5 dB, and reduces extinction ratio (ER) by approximately 2 dB. Engineers can pre-calculate these corrections when performing link budgeting and performance simulations, reducing on-site adjustment costs.

Standard Package Size
  This model uses a Φ5.5 * 38 mm steel tube package, compatible with a 0.9 mm Loose Tube (900 μm loose tube). The compact structure facilitates installation and fixation within modules, trays, or chassis, making it suitable for high-density layouts.

• Fiber Optic and Pigtail Configuration
  • Fiber Optic Type: PM13-U25D Panda Polarization-Maintaining Fiber
  • Standard Pigtail Length: 1.0 ± 0.1 m, other lengths can be customized according to project needs.
  • Sheath Type: Default 0.9 mm Tube, the series also offers options for 250 μm bare fiber, 2.0 mm, and 3.0 mm sheaths to meet different installation and mechanical protection requirements.
• Ports and Connectors
  • Port Type: 1*2 Configuration (One Input, Two Outputs)
  • Standard Connector: FC/APC, FC/UPC, SC/UPC, SC/APC, LC/UPC, LC/APC, or connectorless versions are also available upon request.
  • Connector Keying: Default Alignment with Slow Axis, facilitating a unified polarization reference direction within the system and reducing the probability of errors during field splicing and installation.
• Ordering Information Structure (briefly displayed in a table on the webpage)
  • Model Format: PMFCP-XXX XXX XX XXX XX XX-X X
  • Port NO: 12=1*2, 22=2*2
  • Wavelength: 131=1310nm, 148=1480nm, 155=1550nm, 980=980nm, 106=1064nm, 780=780nm
  • Splitting Ratio: 50=50/50, 90=90/10, 95=95/5, 99=99/01
  • Modules Type: ST1=Φ3.0*45, ST2=Φ3.0*54, SB=90*20*10, etc.
  • Fiber Type: 02=250 μm, 09=0.9 mm, 20=2.0 mm, 30=3.0 mm
  • Fiber Length: 10 = 1.0 m, XX = Custom
  • Connector: 0–6/X represent FC/UPC, FC/APC, SC/UPC, SC/APC, LC/UPC, LC/APC, or custom, respectively.

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