This product is a 1550nm Polarization Maintaining Optical Circulator, with a standard 3-port structure: Port1→Port2, Port2→Port3 unidirectional transmission, used for isolating reflected light, achieving directional optical path transmission, and port multiplexing. The center operating wavelength is 1550 nm, bandwidth is ±30 nm, typical insertion loss is ≤0.7 dB, typical isolation is 46 dB, minimum is ≥40 dB, extinction ratio is ≥22 dB, and return loss is ≥50 dB. It uses Corning PM1550 polarization-maintaining fiber and is packaged in a steel tube, suitable for integration into C-band polarization-maintaining amplifiers, fiber lasers, precision optical instruments, and sensing systems.

• Low Insertion Loss, Protecting Link Power Budget

  Within the 1550 nm ±30 nm range, typical insertion loss is ≤0.7 dB, and maximum insertion loss is ≤0.9 dB across the entire temperature range of -5 to +70 ℃. This effectively reduces the impact of circulators on system OSNR and power margin, making it suitable for medium-to-long-distance and high-performance links.

• High Isolation and Low Crosstalk, Reliably Protecting Front-End Devices

  Typical isolation is 46 dB, minimum isolation is ≥40 dB, and crosstalk is ≥50 dB. This significantly suppresses backlight and crosstalk signals, preventing reflected light from feeding back into lasers, EDFAs, or high-sensitivity detectors, thus 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 ER ≥22 dB, PM fiber and connector keying is aligned with the slow axis, while the fast axis is blocked, this ensures a stable and controllable polarization state in the polarization-maintaining system, making it more suitable for polarization-sensitive interferometry, coherent communication, and polarization-maintaining amplification applications.

• High Return Loss, Reduced System Reflection Impact

  Return loss RL ≥50 dB effectively reduces the impact of end-face reflections on the pre-amplifier and devices, improving system reflection performance and reducing multipath interference.

• Good Environmental Adaptability and Power Handling Capability

  Operating temperature -5～+70 ℃, storage temperature -40～+85 ℃, maximum optical power handling capability ≤300 mW, meeting the long-term online operation requirements of most communication equipment rooms, laboratories, and engineering sites.

• Flexible Selection, Easy Compatibility with Existing Platforms

  Offers a variety of port counts, operating wavelengths (1064/1310/1480/1550/1650 nm), single/dual-stage structures, slow/fast axis applications, different pigtail sheaths (250 μm, 0.9 mm, 2.0 mm, 3.0 mm), and connector combinations (FC/SC/LC, etc.). Order codes allow for quick matching of required configurations, facilitating project-specific selection for equipment manufacturers and system integrators.

• Packaging Form

  Standard Model: ST1 steel tube package, dimensions φ5.5 * L50 mm, compact structure, small footprint, suitable for embedding in modules, cassette devices, or 1U/2U chassis trays.

• Fiber Optic and Pigtail Configuration

  Fiber Type: Corning PM1550 Panda Fiber

  Sheath Type: Optional 250 μm bare fiber, 0.9 mm loose tube, 2.0 mm / 3.0 mm fiber optic cable, etc. (Order codes 02/09/20/30 correspond to different sheaths)

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

• Ports and Connectors

  Number of Ports: 3 Ports (code 03), standard operating direction: Port1→Port2, Port2→Port3

  Typical Port Configuration Example: PMCIR-03155PSAST10910-11

  3 ports, 1550 nm, P-stage, steel tube ST1, 0.9 mm red loose tube, 1 m pigtail, FC/UPC connector, P-level precision, slow axis operation

  Connector Options: Connectorless, FC/UPC, FC/APC, SC/UPC, SC/APC, LC/UPC, LC/APC, etc. The last two digits of the order code distinguish between COM and Port connector types.

• Parameter Corrections with Connectors

  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 (This factor should be considered during selection and link budgeting)

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