Polarizingbeam splitterCube

The fundamental design of Fibercore HiBi fiber makes its performance extremely resistant to environmental conditions (see below) - but because the exact way the fiber is used is beyond our control we cannot guarantee what extinction-ratio you will achieve. Typical ER under various deployment conditions re indicated below - with care, you should be able to match or possible exceed these.

Polarization beam splitterprice

Polarization Beam Splitterthorlabs

Cross coupling in regards to a birefringent fiber, quantified by extinction ratio, indicates the amount of light which is able to mix between the two polarization axes. Extinction-ratio is important because it is a measure of the polarization-maintaining performance of an optical fiber.

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In most applications for HiBi fiber, only one of the two polarization orientations (states) the fiber can guide is used - this is sometimes called the ‘wanted’ polarization-state. The extinction ratio simply compares the optical power held on the wanted axis to that which is on the unwanted axis, the orthogonal polarization state, expressed in decibels (dB).

Polarizingbeam splitterprinciple

These beamsplitters are based upon using two complementary prisms. The output beam that is parallel to the input beam is p-polarized, while the orthogonal output beam is s-polarized.

X = Narrow Band Wavelengths: 488, 514, 633, 780, 850, 1064, 1300, 1550 nm, Y = Broad Band Ranges(nm): 1=450-680, 2=650-850, 3=900-1200, 4=1200-1550

The value of extinction ratio you can achieve is highly dependant upon the length of fiber and the environmental conditions in which you use it.  In particular, if you subject the fiber to high mechanical stress and small-diameter bends, then it is possible to disrupt the internal stress (which generates the birefringence) and this reduces the extinction-ratio significantly.

BSPN1-5-488, BSPN1-5-514, BSPN1-5-633, BSPN1-5-780, BSPN1-5-850, BSPN1-5-1064, BSPN1-5-1300, BSPN1-5-1550, BSPN1-10-488, BSPN1-10-514, BSPN1-10-633, BSPN1-10-780, BSPN1-10-850, BSPN1-10-1064, BSPN1-10-1300, BSPN1-10-1550, BSPN1-15-488, BSPN1-15-514, BSPN1-15-633, BSPN1-15-780, BSPN1-15-850, BSPN1-15-1064, BSPN1-15-1300, BSPN1-15-1550, BSPN1-20-488, BSPN1-20-514, BSPN1-20-633, BSPN1-20-780, BSPN1-20-850, BSPN1-20-1064, BSPN1-20-1300, BSPN1-20-1550, BSPB1-10-1, BSPB1-10-2, BSPB1-10-3, BSPB1-10-4, BSPB1-15-1, BSPB1-15-2, BSPB1-15-3, BSPB1-15-4, BSPB1-20-1, BSPB1-20-2, BSPB1-20-3, BSPB1-20-4

To test the best possible ER of the fiber, light is launched onto one axis from a polarized source, and the ER is a ratio of the light which remains on the wanted axis to that which has managed to couple onto the unwanted axis. For example, if you are using only the x-polarization (the ‘wanted’ polarization) then you would measure the optical power in both ‘x’ and ‘y’ polarizations and perform the following calculation.