PM FA is a Polarization-Maintaining fiber placed in the V-Groove on the array substrate to achieve high-density parallel transmission by maintaining the same polarization direction. Imperfections in the fiber do lead, how-ever, to random power transfer between the two principle states of polarization so that the polarization is not maintained. Polarization-maintaining single- mode fibers (PM fibers) are rotation-ally non-symmetric because of inte-grated stress elements, for. Polarization-maintaining single-mode fibers (PM fibers) are rotationally non-symmetric because of in-tegrated stress elements, for example, that break the degeneracy of the two principle states of polarization (SOP). FiberPorts can be used to provide a stable platform for coupling light into and out of FC/PC, FC/APC, or SMA terminated fiber with five or six directional adjustments.
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Polarization-maintaining fibers work by intentionally introducing a systematic linear in the fiber, so that there are two well defined polarization modes which propagate along the fiber with very distinct phase velocities. The beat length Lb of such a fiber (for a particular wavelength) is the distance (typically a few millimeters) over which the wave in one mode will experience an additional delay of one wavelength compared to the other polarization mode. Thus a length Lb /2 of such fiber is equivalent to a.
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