Any type of fiber optic interconnection requires its interfaces to be free of dust and scratches in order to reach the lowest transmission loss. Small, handheld and battery powered inspection tools are available from AMS Technologies for inspection of fiber optic connectors in the field as well as high resolution type microscopes suitable for use in a production environment for qualifying the endface preparation. Additional S/W tools can support the user in making a quick decision if a certain defect is acceptable or if the surface fault disqualifies it for further use.
Optical fibers for telecom are high-volume industrial goods that are manufactured to tight specifications regarding their mechanical and optical parameters. AMS provides equipment for measurement of chromatic dispersion and of the index of refraction (IOR) of a fiber, as well as tools for determining the eccentricity of a fiber in a ferrule and the cleave angle at the fiber tip. The product line is completed by products to control the state of polarisation and to measure the polarisation extinction ratio.
Chromatic dispersion describes the changing refractive index in materials as a function of wavelength, resulting in varying speeds of light when propagating in optical materials. For an optical pulse in a glass fiber, its intrinsic bandwidth will result in measureable pulse broadening given sufficient propagation distance. AMS Technologies can supply equipment to measure chromatic dispersion in most types of waveguides.
The index of refraction (IOR) is a property of any material. For optically transmitting materials, such as for fibers and waveguides, it is reflected in the reduced speed of light when travelling through any media other than vacuum. Fibers and waveguides use a distribution of the IOR within their cross section to guide and reflect light, and knowledge of this distribution allows many other critical performance parameters to be calculated, such as mode fields, group and phase propagation constants and fiber dispersion. Index of refraction measurement stations for fibers are
The polarisation extinction ratio compares the intensity of light in a fiber with polarisation along the fast axis of the fiber compared to that with polarisation along the slow axis. This measurement is important for any type of qualification of polarisation maintaining components. The requisite light sources and extinction ratio meters needed to perform this type of measurement at various wavelengths are available from AMS Technologies.
The state of polarisation can be adjusted with so-called polarisation state adjustment tools. This is important in any type of measurement where phases need to be measured accurately. AMS Technologies can offer several products to control the state of polarisation.
For transmitting higher optical peak power it is desirable to use Large mode area fibers created by increasing the effective mode field which allows to transmit higher peak powers at the expense of more modes beeing guided. The distribution of the optical energy over several modes guided in a waveguide is called relative modal distribution.