4x4 PM Fiber Optic Coupler 1310nm 1550nm 25:25:25:25 Splitting Ratio ABS Box Package

  The 4*4 PM Fiber Coupler is a multi-port polarization-maintaining optical splitter based on a filter structure. It can distribute one or more input beams in the 1550 nm band equally in proportion to four output beams in a 25:25:25:25 ratio, suitable for polarization-maintaining systems requiring multi-channel power distribution and monitoring. The device operates at a center wavelength of 1550 nm, with a bandwidth of ±15 nm. It uses Corning panda-type polarization-maintaining fiber, with a single-channel insertion loss ≤7.5 dB, redundant loss ≤1.2 dB, extinction ratio ≥20 dB, and return loss and directivity both ≥50 dB, maintaining good polarization and power stability even in complex optical paths. The standard module package size is 100 * 80 * 10 mm, with a pigtail length of 1.0±0.1 m. It supports various connectors such as FC/APC and FC/UPC, making it suitable for direct integration into EDFA, fiber optic instruments, coherent communication, and power monitoring equipment.

• 4*4 proportional power distribution for simpler multi-channel systems

    A single module can achieve a 4-port 25:25:25:25 power distribution, simultaneously serving as a "multi-output," "multi-monitoring," or "multi-beam combining/splitting" node, significantly simplifying the design of multi-splitter, multi-level coupled optical paths.

• Low Insertion Loss and Low Redundant Loss for Easier Link Budgeting

    Within the 1550±15 nm range, single-channel insertion loss is ≤7.5 dB, and redundant loss is ≤1.2 dB. Combined with high return loss and directivity, this minimizes additional losses introduced by devices in multi-port structures, helping to maintain overall network OSNR and power margin.

• Good Extinction Ratio for Both Slow and Fast Axis Applications

    The device has an extinction ratio ≥20 dB, uses Corning Panda polarization-maintaining fiber, and the connector keying is aligned with the slow axis, allowing it to be directly used in typical "slow-axis operation" polarization-maintaining systems from the factory. It also supports Slow-only or Fast Axis applications, meeting the needs of some special polarization structures.

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

    Return loss ≥50 dB and directivity ≥50 dB effectively suppress end-face reflections and port-to-port crosstalk, reducing interference to the pre-stage laser, amplifier, and high-sensitivity detector, thus improving long-term system stability and signal-to-noise ratio.

• Reliable Power and Environmental Adaptability

    Maximum optical power handling capacity ≤300 mW, operating temperature -5～+75 ℃, storage temperature -40～+85 ℃, meeting the requirements for long-term online operation in computer rooms, laboratories, and general industrial environments. Note that with connectors, the power handling capacity drops to 50 mW, insertion loss increases by approximately 0.3 dB, return loss decreases by approximately 5 dB, and extinction ratio decreases by approximately 2 dB, facilitating accurate evaluation by engineers during link budgeting.

• Standardized Platform for Convenient Selection and Integration

    The standard uses Panda polarization-maintaining fiber, 1-meter pigtail, and a 100*80*10 mm box-type package. It supports various sheath structures and connector combinations (FC/UPC, FC/APC, etc.), facilitating product series design and rapid selection for equipment manufacturers and system integrators on a single platform.

• Module Dimensions

  The standard module is box-type packaged with dimensions of 100 * 80 * 10 mm. Its compact size allows for direct mounting in 1U/2U chassis, optical module trays, or the internal backplane of the entire system.

• Fiber Optic Fiber and Pigtails
  • Fiber Type: Corning Panda Polarization-Maintaining Fiber
  • Standard Pigtail Length: 1.0 ±0.1 m (Custom lengths available)
  • Sheath Options: 250 μm bare fiber, 0.9 mm tube, 2.0 mm / 3.0 mm sheaths, etc., suitable for various cabling and mechanical protection needs.
• Connectors and Polarization Alignment
  • Standard Connectors: FC/APC or FC/UPC, other types such as SC/LC are also available upon request.
  • Connector keying with the polarization-maintaining fiber: Slow-axis alignment, facilitating the establishment of a unified polarization reference direction within the system and reducing the risk of axial misalignment during installation and maintenance.
• Parameter Changes with Connectors
  • Handling Power: Reduced to 50 mW
  • Insertion Loss: Increased by approximately 0.3 dB
  • Return Loss: Decreased by approximately 5 dB
  • Extinction Ratio: Decreased by approximately 2 dB

    These changes can be indicated in small tips or footnotes on the product page for easy reference when budgeting system power and performance.

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