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Both technical and design aspects are considered in the development of photonic soft furnishings. A prototype of photonic fabrics and soft furnishings is successfully created.
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A usability test is undertaken to evaluate the performance of the prototype. The result of the usability test reveals that most of the subjects are satisfied with the overall performance of the prototype.
They believe that photonic interior furnishings with changeable colors can enhance the environment. These usability test results are fed back to the design framework, and can provide a good source of reference for the improvement of photonic soft furnishing in the future. Bai, Z. Emerald Group Publishing Limited. Please share your general feedback. You can start or join in a discussion here. Visit emeraldpublishing. Abstract The colors of traditional interior textiles cannot be changed.
Please note you might not have access to this content. However, communications are not the only area where optical fibers can be applied. Today, one of the most common types of lasers are based on fiber-optic technology. A fiber laser, just like any other, incorporates an optical resonator, which causes light to travel back and forth repeatedly. The geometrical parameters of the fiber resonator allow for only a limited set of transverse patterns of light intensity distribution in the output beam -- the so-called transverse modes of the resonator see Fig.
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Naturally, one would want to control the mode structure of the light, and in fact, when it comes to practice, researchers and engineers are mostly seeking to excite nothing but one pure fundamental mode see the upper left corner of Fig. In order to maintain single-mode operation, the fiber must consist of a core and a cladding -- materials with different refractive indexes. Ordinarily, the thickness of the inner part fiber core , through which radiation propagates, normally has to be less than 10 micrometers.
An increase in the optical power of the light propagating in the fiber results in a greater amount of energy being absorbed. This translates into a change in the properties of the fiber.
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Specifically, it causes uncontrolled variation of the refractive index of the fiber material. This gives rise to parasitic nonlinear effects, resulting in additional spectral lines of emission etc. An existing solution to the problem -- which the authors also used -- lies in the variation of the core and outer diameters along the length of the fiber see Fig.
If the expansion of the fiber occurs adiabatically -- that is, relatively slowly -- it is possible to reduce the amount of energy transferred to other modes to less than 1 percent, even with a core diameter of up to micrometers which is exceptionally large for single-mode fibers. Moreover, the fact that the core diameter is large and varies along the fiber increases the threshold for nonlinear effects occurrence.
To achieve the second goal -- which was to preserve the polarization state of the light -- the authors of the study made the cladding of the fiber anisotropic: The width and the height of the inner cladding are different the cladding is elliptical , which means the propagation speed of light with different field oscillation directions is not the same. In a structure like this, the process of transferring energy from one polarized mode to another is almost entirely disrupted.
In their study, the researchers have shown that the geometric length of the path traveled by light through the fiber at which the oscillations of the two different polarizations are in antiphase depends on the fiber core diameter: It decreases as the diameter is increased. This length, known as the polarization beat length, corresponds to one complete rotation of the linear polarization state in the fiber.
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In other words, if you launch linearly polarized light into a fiber, it will be linearly polarized again after traveling precisely this distance. The ability to measure this parameter is in itself evidence of the fact that the polarization state in the fiber is preserved.
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