Single Mode Fiber Optic Circulators
Applications- Add-Drop Multiplexing
- Fiber Sensors
- Bidirectional Pumping
- Bidirectional Signal Transmission Systems
- Coupling In-Line Chromatic Dispersion Compensation Devices
Thorlabs’ Single Mode (SM) Optic Circulators are non-reciprocating, one directional, three-port devices that are used in a wide range of optical setups and for numerous applications. Our SM optical circulators have a center wavelength of 1064, 1310 (O-Band), or 1550 nm (C-Band). Additionally these SM optical circulators have the option of bare fiber, FC/PC connectors, or FC/APC connectors. Thorlabs also offers Polarization-Maintaining (PM) Fiber Optical Circulators. 
Circulator used to drop an optical channel from a DWDM system using a Fiber Bragg Grating. An optical circulator is analogous to an electronic circulator and both perform similar functions. An optical circulator is a three-port device that allows light to travel in only one direction. A signal entering to Port 1 will exit Port 2 with minimal loss, while a signal entering Port 2 will exit Port 3 with minimal loss. Light entering port 2 experiences a large amount of loss at port 1, and light entering port 3 experiences a large amount of loss at ports 2 and 1. Optical circulators are non-reciprocal devices. This means that any changes in the properties of the light caused by passing through the device are not reversed by traveling in the opposite direction. Because of its high isolation and low insertion loss, optical circulators are widely used in advanced communication systems as add-drop multiplexers, bi-directional pumps, and chromatic dispersion compensation devices. The example to the right depicts the use of a circulator to drop an optical channel from a DWDM system using a Fiber Bragg Grating (FBG). The input DWDM channels are coupled into Port 1 of the device with a FBG device connected to Port 2. The single wavelength reflected from the FBG then reenters the circulator in port 2 and is routed accordingly to Port 3. The remaining signals pass through the FBG and exit on the top fiber. Circulators can also be used to send optical signal in two directions down a single fiber. 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. See the example below. For custom wavelength and connector options please contact Technical Support.
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| Item # | CIR-1310-50-APC | CIR1064d | CIR1310d | 6015-3d |
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| Optical Specifications | | WavelengthRange | 1280 - 1400 nm | 1050 - 1070 nm | 1280 - 1340 nm | 1525 – 1610 nm | | Insertion Loss | 1.6 Max a, b | <2.1 dB | <0.8 dB | 0.8 dB Typ, 1.0 dB Max | | Isolation c | 28 dB b | ≥20 dB | ≥40 dB | >40 dB Min | | Directivity (1-3) | 50 dB Min | >45 dB | >50 dB | >50dB | | Polarization Dependent Loss | 0.2 dB Max | ≤0.2 dB | ≤0.15 dB | ≤0.1 dB | | Polarization Mode Dispersion | 0.05 ps Min | ≤0.05 ps | ≤0.1 ps | ≤0.05 ps | | Chromatic Dispersion | 3 ps/nm Max | - | - | - | | Return Loss | 45 dB Min b | ≥50 dB | ≥50 dB | ≥50 dB | | Max Optical Power | 500 mW | 300 mW | 300 mW | 500 mW | | Mechanical Specifications | | Package Dimensions | Ø 5.5 mm x 38 mm | 34 × 8.4 × 8.4 mm | Ø5.5 × 50 mm | Ø 5.5 mm x 50.5 mm | | Fiber | SMF-28e,
900 µm Loose Tube | HI1060
900 µm Loose Tube | SMF-28e,
900 µm Loose Tube | SMF-28e,
900 µm Loose Tube | | Length | 1.0 ± 0.1 m | 1.0 m | 1.0 m | 1.0 m | | Operating Temp | 0 to 70 °C | 0 to 70 °C | 0 to 70 °C | 0 to 70 °C | | Storage Temp | -40 to 85 °C | -40 to 85 °C | -40 to 85 °C | -40 to 85 °C | | Operating Relative Humidity | 5% - 95% | 5% - 60% | 5% - 60% | 5% - 60% | | Storage Relative Humidity | 5% - 95% | 5% - 85% | 5% - 85% | 5% - 85% |
a Includes Wavelength, Temp, Polarization Dependence
b Includes Connector
c Internal isolation, assumes connectorized fiber is well-matched
d Specs based on no connector |
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Single Mode Fiber Optic Circulators
