About Fiber Optic Polarizers
Fiber optic polarizers (FOP) are placed inline to improve the extinction characteristics of fiber optic cable. They allow the transmission of only one polarization, blocking light in unwanted polarization states. Fiber optic polarizers are used because degradation in polarization extinction can cause noise interference and limit the performance of the entire fiber optic system.
Fiber optic polarizers are available in a two cable types, single mode and multimode. Single mode devices have an optical fiber that will allow only one mode to propagate. The fiber has a very small core diameter of approximately 8 µm. It permits signal transmission at extremely high bandwidth and allows very long transmission distances. Multimode fiber optic cable supports the propagation of multiple modes. They typical have core a diameter of 50 to 100 µm with a refractive index that is graded or stepped. They allow the use of inexpensive light emitting diode (LED) light sources and connector alignment and coupling is less critical than single mode fiber. Distances of transmission and transmission bandwidth are less than with single mode fiber due to dispersion.
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Engineering Web: Fiber Optic Polarizers
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