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Description

The Ascentta PM 3-Port Optical Circulator (TGG Type) is designed for polarization-maintaining fiber optic applications operating across a wide range of wavelengths including 532, 635, 650, 780, 850, 980, 1030, and 1060 nm. It utilizes high-quality TGG crystals and advanced optical path alignment to provide efficient signal routing with minimal insertion loss and high isolation between ports.

This circulator enables non-reciprocal transmission in the 1→2→3 path while blocking reverse directions, making it ideal for demanding laser-based systems, interferometry setups, and optical sensing solutions. With a minimum extinction ratio of 18–20 dB, return loss of ≥45 dB, and directivity of ≥40 dB, it ensures reliable performance under varied environmental conditions. The circulator supports optical power handling up to 250 mW, depending on the wavelength, and is available with customizable connector types and fiber lengths.

Built to meet stringent performance standards, the PM 3-Port Optical Circulator comes in a rugged cylindrical housing, ensuring long-term durability and precision alignment for polarization-sensitive applications.

Ascentta Polarization Maintaining Fiber Circulator (850nm)

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Specifications

Type Of The Device: Circulator
Operating Wavelength: 850 nm
Max Power: 0.15 W
Min Isolation: 21 dB
Insertion Loss (Fast Axis Block) (1→2, Or 2→3) Max.: 1.8 dB
Extinction Ratio Min.: 20 dB
Return Loss Min.: 45 dB
Directivity (1→3, Or 3→1) Min.: 40 dB
Fiber Length: 3.0 m
Operating Temperature: 10 to +50 °C
Storage Temperature: 0 to +60 °C
Package Dimensions (Cylinder): Φ21×L60 mm
Optical Power Handling (Max): 50 mW
Manufacturer Part Number (MPN): PMVCIR-3-850-PM-L-10-FA
FindLight SKU: FL-21769

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Features

  • Polarization Maintaining: Designed for PM fibers, with extinction ratios up to 20 dB
  • Wide Wavelength Range: Available for 532, 635, 650, 780, 850, 980, 1030, and 1060 nm
  • Low Insertion Loss: As low as 1.5 dB depending on the selected wavelength
  • High Isolation: Typical isolation up to 27 dB ensures minimal signal leakage
  • High Return Loss & Directivity: ≥45 dB return loss and ≥40 dB directivity for superior signal integrity
  • Robust Design: Compact cylindrical packaging with customizable fiber type, length, and connectors
  • Reliable Power Handling: Supports up to 250 mW optical power, ideal for moderate to high power applications

Applications

  • Laser Systems: Ideal for optical routing in high-precision laser setups
  • Interferometry: Maintains polarization for sensitive optical measurement systems
  • Fiber Optic Sensing: Suitable for distributed or point sensing applications requiring low loss and high isolation
  • Biomedical and Scientific Instrumentation: Supports wavelength-specific applications in life sciences and R&D
  • Quantum and Nonlinear Optics: Facilitates directional signal control in polarization-dependent experiments

Export & Trade Information

ECCN: EAR99
HTS Code: 9027.90.8400
Estimated US Tariff: 0%

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Frequently Asked Questions

What are the wavelengths this product supports?
The product supports a range of wavelengths which include: 532nm, 635nm, 650nm, 780nm, 850nm, 980nm, 1030nm, and 1060nm. These values represent the operational wavelength range that the circulator can handle.
What is the transmitting direction of this product?
The product is designed to transmit in the direction from port 1 to port 2, and from port 2 to port 3. This indicates the sequence of ports in which the light circulates.
What is the typical and minimum isolation in dB?
The product provides a typical isolation of 23 dB for the wavelengths 532nm, 635nm, and 650nm, and 25 dB for 780nm and 850nm, and 27 dB for 980nm, 1030nm, and 1060nm. The minimum isolation is 20 dB for the wavelengths 532nm, 635nm, and 650nm, and 21 dB for 780nm and 850nm, and 22 dB for 980nm, 1030nm, and 1060nm. Isolation refers to the ability of the device to prevent light from returning to the source.
What is the maximum insertion loss in dB?
The maximum insertion loss (for the Fast Axis Block) for 532nm is 2.3 dB, for 635nm and 650nm it's 2.0 dB, and for 780nm, 850nm, 980nm, 1030nm, and 1060nm, it's 1.5 dB. Insertion loss is the reduction of signal power resulting from the insertion of a device in a transmission line.
What is the minimum extinction ratio in dB?
The minimum extinction ratio for all the mentioned wavelengths is 18 dB for the wavelengths 532nm, 635nm, and 650nm, and 20 dB for 780nm, 850nm, 980nm, 1030nm, and 1060nm. The extinction ratio is the ratio of the power of the transmitted light in the principal polarization state to the power of the transmitted light in the orthogonal state.
What is the minimum return loss in dB?
The minimum return loss for all the wavelengths is 45 dB. Return loss is a measure of how much of the light is reflected back towards the source.
What is the minimum directivity in dB?
The minimum directivity for all the wavelengths is 40 dB. Directivity is a measure of the ability of the device to concentrate power flow in a particular direction.
What is the maximum optical power handling in mW?
The maximum optical power handling for 532nm is 50 mW, for 635nm and 650nm it's 100 mW, for 780nm and 850nm it's 150 mW, and for 980nm, 1030nm, and 1060nm it's 250 mW. This represents the amount of optical power that the circulator can handle safely.
How do connectors affect the product?
The product specifications provided are for parts without connectors. Adding connectors can affect the Insertion Loss (IL), Return Loss (RL), and Extinction Ratio (ER). The connector key is aligned to the slow axis.
How to place a custom order?
Contact Ascentta with your custom configuration needs. The ordering information includes the port (PMVCIR3=3-Port), wavelength (e.g., 532=532nm), fiber type (e.g., PM=Polarization-Maintaining), cable type, fiber length, connector, maximum power, and package. Other configurations can be specified.

Got more questions? Use the inquiry form to ask the supplier directly.

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