Inline Faraday Rotator Mirror for 1550 nm with Fiber Optic Pigtail

We have 2 pcs in our stock in Joensuu, Finland. Products are new, in original packages. Features: Returns Light with Polarization Rotated 90° Relative to Input Bismuth Iron Garnet (BIG) Faraday Rotating Element 1310 nm or 1550 nm Center Wavelengths Available Available with 2.0 mm Narrow Key FC/PC or FC/APC Connectors or Unterminated Leads Thorlabs' Faraday Mirrors with a Fiber Optic Pigtail are designed to return light with a 90° orthogonal polarization relative to the input state of polarization (SOP). They allow for greater control over the design of systems such as fiber sensors, erbium-doped fiber amplifiers, and tunable fiber lasers. Faraday mirrors are available with center wavelengths of 1310 nm or 1550 nm. With <0.8 dB insertion loss and >50 dB return loss, these devices provide a high signal-to-noise ratio, which makes them ideal for use in fiber interferometers (see the Applications tab). Rotation of the polarization state is achieved by passing light through a Faraday rotator (shown in the diagram to the right), which consists of a film of bismuth iron garnet (BIG) that has an external magnetic field applied to it by rare-earth magnets. A single pass through the Faraday rotator causes the polarization state of light to rotate by 45° ± 1°. A planar mirror placed after the Faraday rotator returns light back at the same angle of incidence; light passes through the Faraday rotator a second time and light re-entering the input fiber has a polarization state rotated 90°, or orthogonal, to the input polarization state. Faraday mirrors additionally provide the ability to minimize alterations to the polarization state induced by thermal and mechanical perturbations in the fiber. This behavior is possible because the light will travel through the same fiber when entering and exiting the Faraday rotator (i.e., the pigtailed single mode fiber). Any perturbations to the polarization state that are caused by the fiber are reversed during the return trip. As such, Faraday rotator mirrors will correctly compensate for SOP changes caused by the fiber without using polarization-maintaining fiber; however, the return polarization will be orthogonal to the input polarization. These Faraday Rotator Mirrors are pigtailed with 1 m of SMF-28 Ultra single mode fiber, which is mounted in a standard Ø900 µm tight tube buffer with proper strain relief. Versions are available with 2.0 mm narrow key FC/PC or FC/APC connectors; the 1550 nm Faraday rotator is also available unterminated. https://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=3365&pn=MFI-1550-FC