PM&High Power Fiber Components

Polarization Beam Splitters And Non-polarization Beam Splitters

Polarization maintaining fiber: In the interferometric optical fiber sensor based on optical coherent detection, the use of polarization maintaining optical fiber can ensure that the linear polarization direction remains unchanged, improve the coherent signal-to-noise ratio, and thus achieve high-precision measurement of physical quantities.

Polarization maintaining fiber is used as a a kind of special optical fiber and high-tech product as well. A series of products concerning polarization maintaining optical fiber is widely used in various fields of national economy such as aerospace, aviation, navigation, industrial manufacturing technology and communication etc.

The main differences between polarization beam splitters and non-polarization beam splitters

Polarization beam splitter (PBS)

The PBS serves as splitting the incident light into beams, and the outgoing light will be in two directions. The vibration direction of one beam of light is perpendicular to the incident surface, and the vibration direction of the other beam is parallel to the incident surface. It is often used in optical paths with special requirements on polarization state. The principle of polarization beam splitting is that when the incident angle is the polarization angle, the reflective light is linearly polarized light whose vibration direction is perpendicular to the incident surface, and the reflective light generally accounts for a single digit percentage of the total light intensity. The linearly polarized light component of the vertical incident plane screened out by the method of multi-layer medium superposition finally makes the two parts of the final outgoing light be relatively pure vertically linearly polarized light and (the remaining) relatively pure parallel linearly polarized light respectively.

Non-polarization beam splitter (NPBS)

The non-polarization beam splitter serves separating the energy of the incident light, and the polarization state of the two outgoing beams has no specific change compared with the incident light, which just means the splitting of light. Its production is usually coated with a certain proportion of mercury on the separated surface, so that the ratio of the intensity of the refractive light to the incident light is just same as expected, such as the beam splitter in an interferometer.

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