#BENDING PLANET WAVES PATCH CABLES FOR FREE#

#BENDING PLANET WAVES PATCH CABLES FOR FREE#

All values are specified for unterminated (bare) silica fiber and apply for free space coupling into a clean fiber end face.

Д®stimated Optical Power Densities on Air / Glass Interface a For further discussion about an optical fiberвЂ™s power handling abilities forВ a specific application, please contact ThorlabsвЂ™ Tech Support. Following all appropriateВ preparation and handling guidelines, users should be able to operate a fiber component up to the specified maximum power level if no maximum is specified for a component, users should abide by the 'practical safe level' described below for safe operation of the component.В Factors that can reduce power handling and cause damage to a fiber component include, but are not limited to, misalignment during fiber coupling, contamination of theВ fiber end face, or imperfections in the fiber itself. UsersВ can use this guide to estimate a safe power level that minimizes the risk of damage. While the damage threshold can be estimated using scaling relations and general rules, absolute damage thresholds in optical fibers are veryВ application dependent and user specific. The maximum power that a fiber can handle will always be limited by theВ lowest limit ofВ any of these damage mechanisms. A fiber component, such as a bare fiber, patch cable, or fused coupler, may have multiple potential avenues for damage (e.g., connectors, fiber end faces, and the deviceВ itself). These mechanisms include damage that occurs at the air / glassВ interface (when free-space coupling or when usingВ connectors) and in the optical fiber itself. The following tutorial details damage mechanisms relevant toВ unterminated (bare) fiber, terminated optical fiber, and other fiber components from laser light sources. Laser-Induced Damage in Silica Optical Fibers Preparation and Handling of Optical Fibers The MFD in the near field can be determined from this far-field measurement using the Hankel Transform. The MFD is then determined using Petermann's second definition, which is a mathematical model that does not assume a specific shape of power distribution.

the sine of the aperture half-angle (or the numerical aperture for an SM fiber). As successively smaller apertures are placed in the beam, the intensity levels are measured for each aperture the data can then be plotted as power vs. An aperture is placed in the far field of the fiber output, and the intensity is measured. The measurement of MFD is accomplished by the Variable Aperture Method in the Far Field (VAMFF).

The light can be approximated as a Gaussian power distribution as shown to the right, where the MFD is the diameter at which the optical power is reduced to 1/e 2 from its peak level. While much of the light in an optical fiber is trapped within the fiber core, a small fraction propagates in the cladding. It is a function of wavelength, core radius, and the refractive indices of the core and cladding. The mode field diameter (MFD) is one measure of the beam width of light propagating in a single mode fiber. The right image shows the standard intensity profile of the beam propagated through the fiber with the MFD and core diameter called out. The left image shows the intensity profile of the beam propagated through the fiber overlaid on the fiber itself.

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