The  optical fiber stands for an exceptionally appealing correspondence medium since it offers an enormous data transmission and low lessening, also, can in this manner encourage requesting administrations like excellent visual communication as well alternatives in PC organizations. In this study, a good strategy simulation based on mathematical equations has been presented for a unique optical channel correspondence. Also, this paper shows the nonlinear analysis  phenomenon of fiber scattering, modulator as well recipient reaction periods, coding type of waveform. The light source spectral width have influence to the presentation of the fiber optics correspondence like link length, information rate, BER. Additionally, this paper show the force and rising period, spending plan is utilized to get a good guess of the communication length as well the piece rate utilizing optical framework test scheme.

In this study we describe an experiment, which considers the output beam power of fibers with different materials at a fixed length by using the LED, white lamp and a laser as the illumination light source. Laser is a coherent light source and other two light sources are incoherent light sources. In another experiment the length effect is studied and for this purpose two similar fibers with the length of 4 cm and 52/5 cm are tested and the output beam powers of these fibers for three illumination sources are measured. The obtained results are compared and our results show that among tested light sources laser beam shows the maximum output power for the short length fiber and therefore laser light source is the most efficient light source for the fiber optic transmission lines.

In this paper, Using a 2D photonic crystal and a novel square ring resonator, several compact and simple structures have been introduced in the present paper to construct optical add/drop filters and multi-channel filter. The difference structures has been designed and simulated by using the proposed square ring resonator and different dropping waveguides. To do analyses, the finite-difference time-domain method and the plane wave expansion have been used. The three add/drop filters can separate the wavelength of 1554 nm with a transmission coefficient of 100 %, quality factor of 1295 and bandwidth of 1. 2 nm. The models of structures are simulated by the RSOFT CADLayout software. The results, flexibility and simplicity of structures have caused from their used to designing of an optical multi-channel filter with a channel spacing of 1. 5 nm. The advantages of this design include the channel spacing, quality factor, transmission coefficient and bandwidth which are suitable for applicability in optical communication systems such as wavelength division multiplexing systems.

Waveguides with low confinement loss, low chromatic dispersion, and low nonlinear effects are used in optical communication systems. Optical fibers can also be employed in such systems. Besides optical fibers, photonic crystal fibers are also highly suitable transmission media for optical communication systems. In this paper, we introduce two new designs of index-guiding photonic crystal fiber (IGPCF) with characteristics appropriate for optical communications. In the first proposed design with a hexagonal structure having a defect at the center, the chromatic dispersion at the wavelength of 1550 nm is less than 1 ps/(nm. km). In the second design with a hexagonal structure having air holes with unequal diameters, nearly zero dispersion at the wavelength range of 1370 to 1380 nm is achieved. At the same time, for the latter design, at the wavelength of 1550 nm, the chromatic dispersion slope is 1 ps/(km. nm), the confinement loss is less than 10􀀀 9 dB/km, and the nonlinear coefficient reaches 3. 690 W􀀀 1. km􀀀 1.

Operation of a prism optical fiber sensor for liquid level detection is described. This sensor operates on light intensity modulation, where modulations result from alteration of total internal reflection into partial reflection at the interface. The modulated intensity has been measured by using a source light, a pair of plastic optical fibers (one transmitting and the second one acting as receiving fiber) and a glass prism providing the total and partial reflections. The performance of this sensor is tested with a laser source and the results are reported here. To analyze the operation of such a sensor theoretical formulation for the sensor operation is also given in this study. A comparison is made between the theoretical estimation and the experimental results.

In this paper the output beam images and intensity profiles of an optical fiber are investigated by imaging technique. Different experiments are performed for the given fiber and captured images for the white LED and red LED sources are compared. The real-time images are investigated for two types of light sources and major differences are discussed. The effect of the light source frequency bandwidth on image formation is also investigated and obtained image patterns are discussed in detail. The resulting field intensity distributions and their relative changes with respect to the illumination source are examined and the role of fiber parameters in image cross sections is discussed. Two major differences are observed in terms of base width and FWHM bandwidth of the intensity curves for white and red LED lights. The white light LED source intensity curve shows a wider bandwidth in comparison with the red light LED intensity profile for the same fiber transmissions.

The use of different optical-fiber sensors for weighing measurements is described. By using three different mechanical stressing mechanisms, the operations of the fiber-to-fiber transducer systems are tested and the results are presented. Parameters such as sensitivity, hysteresis, resolution, and dynamic range are measured. A comparison of the results has shown that the sensor system made with a cantilever steel beam offers a better overall performance. It shows a sensitivity of about 4.8 mV/gm, a maximum hysteresis of 4%, and has a resolution of 0.2 gm for a dynamic range of about 140 gm. The reported systems offer simplicity in design and can be implemented for force/pressure measurements.

In this research, creative techniques have been applied on the surface of polymer optical fiberto observ new optical effects in the production of luminous textiles and their further application in designing luminous clothing. Accordingly, optical fibers of three different thicknesses (0. 25, 0. 5, and 0. 75 mm) were subjected to secondary operations using techniques such as knotting, pulling, grinding the surface with sandpaper, melting, and creating scratches with a cutter, and were exposed to LED to evaluate their luminescence. The result showed that the light emitted from fibers with greater thickness shined more than the similar samples in fibers with less thickness. Additionally, a thicker fiber has been proven to be less flexible than a thinner fiber. Thinner plastic fibers revealed faster melting and weremore fragile and more sensitive to heat. In the knotting and melting methods, the obtained light was appeared in the form of a three-dimensional spotlight. In the melting method, the resulting light was appeared brighter than other samples due to the formation of a spherical shape in the fiber tip. On the other hand, the light emitted from the samples exposed to sanding and pulling scatter appeareduniformly due to the fiber transparency and linear processing. The conducted research declaredthe high potential of optical fibers for the production of luminous textiles with unique design capabilities and their high efficiency in the fashion and clothing industry.