3 Ports 1310nm Polarization Maintaining Optical Circulator

3 Ports 1310nm Polarization Maintaining Optical Circulator

The 3 Ports 1310nm Polarization Maintaining Optical Circulator is a high-precision, non-reciprocal passive optical device designed to route light sequentially from Port 1 → Port 2 and Port 2 → Port 3, while preserving the polarization state of the transmitted light. Operating at 1310 nm, it provides low insertion loss, high isolation, and excellent polarization extinction ratio (PER), making it ideal for polarization-sensitive systems that require stable and repeatable signal transmission.

Built with high-quality polarization-maintaining (PM) fiber, this circulator ensures that the optical axis alignment (slow or fast axis) remains consistent throughout transmission. It features outstanding thermal and mechanical stability, guaranteeing reliable operation in demanding laboratory and field environments.

This device is widely used in fiber interferometers, coherent communication systems, fiber laser setups, and polarization-sensitive measurement equipment, where maintaining polarization is critical for performance and accuracy.

Specifications

Note: Measured at 25°C. Data exclude connectors; adding connectors increases insertion loss by 0.3 dB, reduces return loss by 5 dB, and lowers extinction ratio by 2 dB. The PM fiber slow axis is aligned to the key by default.

Features

Three-port circulator
Low loss, good interchangeability, good inter-pluggability.

Three independent ports
It has low insertion loss, broadband high isolation, and low PDL.
Excellent temperature stability can be used for wavelength addition and subtraction, dispersion compensation, and EDFA applications.

Application Diagrams

Circulator can be used to send optical signals through a single fiber in two directions.
As the picture shows: A Circulator is located at both ends of the fiber. Each Circulator functions to add a signal in one direction while removing the signal in the other.

Dimension Drawing (Unit: mm)