1310nm 1480nm 1550nm Optical Isolator Low Insertion Loss High Isolation For Optical Instrument

Designed to protect polarization-sensitive optical systems, the PM Isolator delivers stable one-way light transmission with low loss, high isolation, and reliable polarization control. It is engineered to suppress back reflections, protect upstream lasers and amplifiers, and improve overall link stability in demanding fiber optic applications.

• Low Insertion Loss, Less Link Budget Pressure

  At 23℃, the typical insertion loss for a single-stage P/A stage is only about 0.4 / 0.5 dB, and for a two-stage P/A stage it is 0.5 / 0.6 dB. Within the full temperature range of -5 to +70℃, the maximum generation insertion loss is only ≤0.55～0.80 dB, having a very small impact on system OSNR and power margin, making it suitable for medium- to long-distance or multi-stage amplification links.

• High Isolation, Effectively Suppressing Backlight and Crosstalk

  Single-stage isolators achieve a peak isolation of 42/40 dB (P/A level), while dual-stage structures offer even higher peak isolation, reaching 58/55 dB. At the actual operating point (23 °C), single-stage isolators maintain ≥28/≥26 dB, and dual-stage isolators maintain ≥48/≥45 dB, significantly suppressing reflected light and crosstalk signals from feeding back into the laser or amplifier, thus improving system stability and reliability.

• High Extinction Ratio, Strong Polarization Control

  Two polarization operating modes are provided:

  • Type 1: Fast axis blocked, extinction ratio ≥20/≥18 dB;
  • Type 2: Both axis working, extinction ratio ≥25/≥23 dB.

  Meanwhile, the PM fiber and connector keying are aligned with the slow axis, while the fast axis is blocked (for Type 1). This ensures polarization preservation and facilitates a unified polarization reference direction within the system, making it particularly beneficial for interferometric, coherent detection, and polarization-maintaining amplification applications.

• High Return Loss and Good Power Carrying Capacity

  The device's return loss is ≥55 dB, and the maximum input optical power is ≤300 mW, effectively reducing the impact of end-face reflections on pre-amplifier devices (such as lasers and EDFAs). It can operate stably for extended periods in most communication and laboratory systems.

• Wide Temperature Range for Enhanced Reliability in Engineering Applications

  The operating temperature is -5～+70 ℃, and the storage temperature is -40～+85 ℃, making it suitable for various application environments, including indoor computer rooms, experimental platforms, and some outdoor enclosures, meeting the reliability and environmental adaptability requirements of engineering applications.

• Predictable Performance with Connectors, Facilitating Design

  The specifications clearly state that the connector version has an increase of approximately 0.3 dB in insertion loss, a decrease of approximately 5 dB in return loss, and a decrease of approximately 2 dB in extinction ratio. Engineers can more accurately evaluate system metrics when performing link budgeting and performance simulations.

• Packaging Type
  • P1 Steel Tube Type: Dimensions φ5.5 * L35 mm, suitable for 250 μm bare fiber or 0.9 mm loose tube pigtails. Compact design, facilitating integration within modules or compact devices.
  • P2 ABS Box Type: Dimensions 90 * 20 * 10 mm, suitable for 2.0 mm / 3.0 mm fiber optic cables, suitable for rack-mounted equipment, tray mounting within chassis, and standard cabling.
• Fiber Optic and Pigtail Configuration
  • Fiber Type: Corning PM Panda Fiber. PM1310 is used for the 1310 nm model, PM1550 for the 1550 nm model, and other wavelengths use the corresponding polarization-maintaining fiber.
  • Standard Pigtail Length: Typically 1.0 m, but custom lengths are available upon request.
• Connector and Polarization Alignment
  • Optional Connectors: Seamless, FC/UPC, FC/APC, SC/UPC, SC/APC, LC/UPC, LC/APC, etc. The last two digits of the order code indicate the connector type for the input and output ends, respectively.
  • PM fiber and connector key alignment is on the slow axis, with the fast axis blocked (Type 1), ensuring clear polarization direction during installation and splicing. This facilitates a consistent polarization reference with polarization-maintaining jumpers, polarization-maintaining couplers, and other devices.

• EDFA (Erbium-Doped Fiber Amplifiers)
• Fiber Lasers
• Fiber Optic Sensors
• Optical Instruments
• Coherent Communication Systems
• Interferometric Measurement Systems
• Polarization-Maintaining Amplification Modules
• Precision Photonics and Laboratory Test Platforms