TECHNICAL DATASHEET

3x3 PM Fused Fiber Coupler (Polarization Maintaining)

Monolithic 3x3 Polarization-Maintaining Fused Fiber Coupler manufactured with Panda PM fiber. Provides balanced 33.3% / 33.3% / 33.3% power splitting with high extinction ratio (>20 dB) and strict 120° phase symmetry for fiber optic gyroscopes (FOG) and 3x3 interferometers.

Technical Specifications

Parameter
Specification
Unit
Port Configuration
3x3
-
Center Wavelength
1550, 1310, 1064, 980, 850
nm
Operating Bandwidth
±15 (1310/1550), ±10 (850-1064)
nm
Splitting Ratio
33.3 / 33.3 / 33.3 (Balanced)
%
Max. Excess Loss
0.8 (1310/1550), 1.0 (980/1064), 1.2 (850)
dB
Max. Uniformity
1.0
dB
Min. Extinction Ratio @ 23°C
20 (Slow axis), 18 (Fast axis blocked)
dB
Min. Return Loss
50
dB
Max. Optical Power (CW)
500
mW
Fiber Type
PM Panda Fiber on all 6 ports
-
Operating Temperature
-40 to +85
°C
Storage Temperature
-40 to +85
°C
Package Dimensions
dia. 3.0 x 54 mm / dia. 3.0 x 70 mm / 90 x 14 x 8.5 mm
mm
Technical Datasheet Note
Monolithic 3-fiber fused biconical taper ensures intrinsic 120-degree optical phase shift between ports, critical for passive homodyne demodulation in FOG.
Configuration and ordering notes

Configuration parameters include operating wavelength (1550nm standard for telecommunications/sensing; 1310nm or 850nm for tactical gyroscopes) and fiber lead length.

Selection Guidance: Review extinction ratio formulas, axis alignment, and splicing tolerances in our PM Fiber Components & Extinction Ratio Guide ↗ or Fiber Polarizer Selection Guide ↗.

Key Applications

Fiber optic gyroscopes (FOG) passive homodyne detection; 3x3 fiber Mach-Zehnder and Michelson interferometers; Coherent optical demodulators.

Package Drawing

100 3x3 PM Fused Fiber Coupler (Polarization Maintaining), Port Configuration: 3x3 – KernsOptic
Package reference for 3x3 PM Fused Fiber Coupler (Polarization Maintaining). Confirm the final configuration during engineering review.

Need an exact configuration?

A quotation review can begin with the application, quantity and available component information. Wavelength, optical power, fiber and termination details can be clarified with engineering.