Low Insertion Loss High Isolation Fiber Optic Circulator 1550nm 3 Port For EDFA Fiber Laser

  This product is a 1550nm Polarization Maintaining Optical Circulator, employing a 3-port structure to achieve one-way transmission from Port1 to Port2 and from Port2 to Port3, effectively blocking back-reflected light, protecting upstream components, and optimizing system optical path design. The device operates at a center wavelength of 1550 nm, with a bandwidth of ±30 nm, typical insertion loss ≤0.7 dB, and isolation ≥40 dB. It is suitable for integration into various C-band polarization-maintaining fiber optic communication, amplification systems, and precision optical platforms.

• Low Insertion Loss, Link Budget Friendly Within the 1550 nm ±30 nm operating range, the typical insertion loss is ≤0.7 dB, and the maximum insertion loss is ≤0.9 dB within the -5 to +70 ℃ temperature range. This minimizes the device's impact on the overall link OSNR and power budget, making it suitable for medium- to long-distance or high-performance systems.

• High Isolation & Low Crosstalk, Protecting Pre-amplifier Devices Typical isolation 46 dB, minimum isolation ≥40 dB, crosstalk ≥50 dB, effectively suppressing back-reflected light and crosstalk signals, preventing light reflection back to the laser, amplifier, or sensitive devices, significantly improving system stability and signal quality.

• High Extinction Ratio, Excellent Polarization Performance Utilizing Corning PM1550 panda-type polarization-maintaining fiber, with an extinction ratio ≥22 dB, connector key alignment with the slow axis and fast axis blocking ensure stable polarization state maintenance in the polarization-maintaining system, making it more suitable for polarization-sensitive interferometry, coherent detection, and polarization-maintaining amplification applications.

• High Return Loss, Reducing Reflection Impact Return loss ≥50 dB effectively reduces the impact of end-face reflections on the pre-amplifier and devices, improving system reflection performance and overall stability.

• Excellent Power and Environmental Adaptability Maximum optical power handling capacity ≤300 mW, operating temperature -5～+70 ℃, storage temperature -40～+85 ℃, meeting the long-term online operation requirements of most communication equipment rooms, laboratories, and engineering sites.

• Selectable Single/Dual Stage, Adaptable to Multiple Scenarios Provides two structures: Single Stage (S) and Dual Stage (P), allowing for flexible balance between insertion loss and isolation; slow-axis operation (SA) or customized fast-axis application versions are available, facilitating precise selection based on different system architectures and cost requirements.

• Packaging Form

  Standard models use ST1 steel tube packaging: φ5.5 * L50 mm, with a compact structure and small footprint, facilitating installation in modules, cassette devices, or 1U/2U chassis trays.

• Fiber Optic Cables and Pigtails

  Fiber Optic Type: Corning PM1550 Panda Fiber

  Standard Sheath: 0.9 mm loose tube (e.g., 0.9 mm red loose tube in the order example), also available with 250 μm bare fiber, 2.0 mm, or 3.0 mm sheaths.

  Standard Pigtail Length: 1.0 m (code 10), longer or other lengths can be customized according to project requirements.

• Port Configuration and Identification

  Number of Ports: 3 Ports (code 03)

  Typical Operating Direction: Port1 → Port2, Port2 → Port3

  Ports can be distinguished by different colors or labels for quick on-site identification of input, output, and intermediate ports, reducing the risk of incorrect connections.

• Connector Configuration

  Optional: No connector, FC/UPC, FC/APC, SC/UPC, SC/APC, LC/UPC, LC/APC, etc.

  The last two digits of the order code represent the COM port and... Port connector type, e.g., 22 = FC/APC at both ends

  PM fiber and connector key alignment on the slow axis, fast axis blocked, facilitating a unified polarization reference direction for the entire system.

• Parameter correction with connector

  • Insertion loss IL increases by approximately 0.3 dB
  • Return loss RL decreases by approximately 5 dB
  • Extinction ratio ER decreases by approximately 2 dB

• EDFA amplifier system
• Fiber Optic Instrument
• Fiber Laser
• Fiber Sensor