3 Ports 1550nm Polarization Maintaining Optical Circulator

3 Ports 1550nm Polarization Maintaining Optical Circulator

The 3 Ports 1550nm Polarization Maintaining Optical Circulator is a high-performance, non-reciprocal passive optical device designed to guide light sequentially from Port 1 → Port 2 and Port 2 → Port 3 while preserving the polarization state of the transmitted signal. Operating at 1550 nm, it offers low insertion loss, high isolation, and an excellent polarization extinction ratio (PER), ensuring reliable and accurate optical signal transmission in polarization-sensitive systems.

Built with PM1550 PANDA fiber, the device maintains precise polarization alignment — with the slow axis aligned to the key by default — providing outstanding stability and repeatability over time and temperature. Its compact and robust construction makes it suitable for both laboratory and industrial environments.

The circulator is widely used in fiber laser systems, interferometers, coherent detection setups, fiber sensors, and optical test instruments, where polarization control and signal integrity are critical.

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)