4 Ports Polarization Insensitive Optical Circulator

Product Item: #3554

(1 Customer Reviews)

P/N: FM-PICIR-4-X-X

Starting at: US$324.00

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Order Today, Ship before 06/10/2026, from U.S. or Hong Kong

Description
Datasheet
Tags
FAQ

Insensitive Polarization Optical Circulator 4 Ports

Fiber-Mart’s Four-port Optical Circulator is a special type of circulator that has one input (port 1), one output (port 4) and two common ports (port 2&3). The light goes through port 1 to port 2. At port 2, any incoming light is guided to port 3 as output, while all input from port 3 is guided to port 4 as output.
Compared to three-port circulator, four-port device has one additional bi-directional port. Hence, it can be used to construct more flexible or more complex optical fiber sub-systems, such as add/drop module, mux/demux module, multi-port bi-directional splitters, WDM optical router, etc.

Characteristics

Low Back Reflection
High Extinction Ratio
Low Insertion Loss
High Return Loss

Applications

DWDM system
Add-Drop Multiplexing
Fiber Amplifier
Fiber Sensor
Chromatic Dispersion Compensation Devices
Fiber Bragg Grating
Polarization maintaining optical system

Application Diagram

Below are Three Port Circulator application for your reference.

	As the picture shows: 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.
Circulator used to drop an optical channel from a DWDM system using a Fiber Bragg Grating.

	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. See the example to the left.
Circulator can be used to send optical signals through a single fiber in two directions.

Dimension

Sample Picture

Order Information

wavelength	Type	Grade	Pigtail Type	Length	Connector
1310nm 1480nm 1550nm 1585nm 1520~1620nm	3 Ports 4 Ports	P Grade	250um bare fiber 900um loose tube 3mm loose tube 2mm loose tube	0.5m 0.8m 1.0m 1.5m 2.0m Custom	None FC UPC/APC SC UPC/APC LC UPC/APC ST UPC/APC E2000 UPC/APC MU

Note:
1. Wavelength: Fiber-Mart can customize any other wavelengths according to your requirement.
2. Length: The default length for the cable is 1M, Fiber-Mart could also provide 0.5M,0.8M,1.5M, 2.0M ,etc.
3. Connector: Each port of the Circulator could be with any connector such as FC/LC/SC/ST,etc. Please contact us by email to [email protected] or call at +1-205-282-9089 if you have any requirement for it.

Type Parameter	3 Port	4 Port
Operating wavelength (nm)	1310, 1480,1550,1585,(+/-30)	C+L(1520~1620)	1310,1480,1550,1585,(+/-30)	C+L (1520~1620)
Isolation (λc,23℃ all sop) (dB)	≥40	≥40	≥40	≥40
Isolation (Over all λ, T, sop) (dB)	≥35	≥30	≥35	≥30
Insertion Loss (λc,0~70℃ all sop) (dB)	Grade P	≤0.8	≤1.1	≤0.8	≤1.2
Grade A	≤1.0	≤1.2	≤1.0	≤1.3
PDL (dB)	≤0.15	≤0.20
Return loss (dB)	≥50
PMD (ps)	≤0.1
Directivity	≥50
Power handling (mW)	≤300
Fiber Type	SMF-28e
Operating temperature (℃)	0 ~ +70
Storage temperature (℃)	-40 ~ +85
Package Dimensions (mm)	For bare fiber of 900um loose tube	φ5.5×L50(P2)	φ5.5×L68(P5)	φ5.5×L64(P8)
For 3mm cable	L98XW14.5XH8.5(P6)	L90XW20XH9.5(P9)	L80xW12xH10(P7)