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Polarite™ Polarization Controllers

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Polarite™ Polarization Controllers

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In fiber optic communication and sensing systems, many devices, such as interferometers and electro-optic modulators, are polarization sensitive. In order for these polarization sensitive devices to function properly, the polarization state of the input light must be precisely aligned with a particular axis of these devices. Unfortunately, the polarization state of light propagating in a length of standard circular fiber varies along the fiber due to the random birefringence induced by the thermal stress, mechanical stress, and irregularities of the fiber core. Generally, the light at the output end of the fiber is elliptically polarized with varying degrees of ellipticity and with the major elliptical axis at an arbitrary angle relative to some reference orientation. Therefore, to properly input light from standard fiber to a polarization sensitive device, one must first convert the arbitrarily polarized light from the standard fiber to linearly polarized light and align it with the correct axis of the polarization sensitive device.

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