Description
633nm 3-port Multimode Optical Circulator
633nm 3-port Multimode Optical Circulator is a fiber passive component built with MM fiber, which can change signal light transmission path, the signal can be delivered from Port 1 to Port 2, the other signal light from Port 2 to Port 3, the high isolation can block the back reflection light. It’s widely used in Quantum Communication, Fiber Laser and Coherent Detecting System field. The multimode fiber can be 50/125 or 62.5/125 fiber.
| Application: | Features: | ![]() |
| Quantum Communication | High Return Loss | |
| Fiber Laser | High Isolation | |
| Coherent Detecting | Low Insertion Loss | |
| Lab & Research | High Reliability |
Specification:
| Parameter | Symbol | Value | Unit |
| Center Wavelength | λ | 633 | nm |
| Bandwidth | BW | ±10 | nm |
| Typ. Insertion Loss (Port 1 to 2, 2 to 3) | IL | 1.0 | dB |
| Max. Insertion Loss (Port 1 to 2, 2 to 3) | IL | 1.5 | dB |
| Typ. Peak Isolation (Port 2 to 1, 3 to 2) | ISO | 22 | dB |
| Min. Isolation (Port 2 to 1, 3 to 2) | ISO | 20 | dB |
| Min. Cross Talk | Ct | 35 | dB |
| Min. Directivity | 35 | dB | |
| Min. Return Loss | RL | 35 | dB |
| Max. Optical Power (CW) | P | 500 or customized | mW |
| Max. Tensil Load | 5 | N | |
| Fiber Type | 50/125 or 62.5/125 MM fiber | – | |
| Operating Temperature | T | +10~50 | ℃ |
| Storage Temperature | T | 0~60 | ℃ |
| Package Dimension | mm |
| Notice: Above specifications are tested at center wavelength without connector in room temperature @23℃. |
| For devices with connectors, IL will be 0.3dB higher, RL will be 5dB lower. |
Drawing:

Ordering Information (Part Number):
| MMCIR-WWW-P-FF-J-LL-CC |
|||||
| WWW | P | FF | J | LL | CC |
| Wavelength | Port | Fiber Type | Fiber Jacket | Fiber Length | Connector |
| 606 – 606nm | 3 – 3 Ports | M5 – 50/125 | B – 250um Bare Fiber | 05 – 0.5m | NE – None |
| 633 – 633nm | M6 – 62.5/125 | 9 – 900um Loose Tube | 10 – 1.0m | FA – FC/APC | |
| 635 – 635nm | 2 – 2.0mm Loose Tube | 15 – 1.5m | FU – FC/UPC | ||
| 637 – 637nm | 3 – 3.0mm Loose Tube | 20 – 2.0m | SA – SC/APC | ||
| 640 – 640nm | SS – Specify | SU – SC/UPC | |||
| 650 – 650nm | LA – LC/APC | ||||
| 670 – 670nm | LU – LC/UPC | ||||
| 680 – 680nm | SS – Specify | ||||
| SSS – Specify | |||||
Example: MMCIR-633-3-M5-9-10-FU is the PN for 633nm 3-port Multimode Optical Circulator, 500mW CW Optical Power, 1.0m 50/125 MM fiber, 900um loose tube, FC/UPC connector



