FOR/FOFM Pigtail-Style Faraday Rotators and Mirrors

AMS item number: SW11913

Center Wavelength 633-1550 nm; Typ. Insertion Loss 0.5-0.8 dB; Return Loss 40, 60 dB;... more

Product information "FOR/FOFM Pigtail-Style Faraday Rotators and Mirrors"

Center Wavelength 633-1550 nm; Typ. Insertion Loss 0.5-0.8 dB; Return Loss 40, 60 dB; Polarization Extinction Ratio 20-30 dB; Fiber Type SM, MM, PM; Rotation Angle @Center Wavelength 45°

OZ Optics’ FOR/FOFM pigtail-style Faraday rotators change the polarization state of light traveling through them. The output polarization state is rotated by 45 degrees with respect to the input polarization.

When combined with a mirror, the reflected light is rotated by another 45 degrees, resulting in a 90 degree rotation. In addition, the polarization handedness is reversed by the mirror. This results in a reflected polarization that is orthogonal to the original polarization. This is useful when used in interferometers, because polarization changes through the fiber are cancelled out on the return journey.

Different Faraday rotator materials are applicable to different wavelengths. At 1300 nm to 1600 nm, small powerful rotators allow for very compact packages. From 633 nm to 1064 nm, less powerful rotators materials requiring much longer lengths and larger magnets are used. This accounts for the wide range of package sizes for different wavelength regions. Rotation accuracy is very tightly controlled at 1300 nm to 1625 nm (standard ±3 degrees single pass — with ±1 degree available) but less controllable at lower wavelengths (±3 degrees standard).

Faraday rotator mirrors are readily available at telecom wavelengths (1300 nm to 1550 nm). For shorter wavelength applications where an Faraday mirror is required, it can be constructed using a Faraday rotator with a polarization maintaining fiber output pigtail and a polarization maintaining fiber pigtailed fixed reflector.

Key Features:

Single Mode (SM), Multi Mode (MM), and Polarization Maintaining (PM) Versions Available
Wide Range of Center Wavelengths: 633 nm to 1550 nm
Low Insertion Loss: 0.5 dB to 0.8 dB Typ., 0.75 dB to 1.0 dB Max.
Low Back Reflection
Return Loss: 40 dB, 60 dB
Polarization Extinction Ratio: 20 dB to 30 dB
Rotation Angle at Center Wavelength: 45°
Rotation Tolerance at Center Wavelength, +25°C: ±3°, ±1°
Compact Housing

Applications: Fiber Lasers; Interferometers Sensors; Amplifiers; Circulators; OCT Systems