الفهرس 
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Abstract
The trajectory of a light travelling in a fiber optic link of biquadratic refractive index (w-shaped) is derived under a simple accurate closed period form (avoiding the paraxial ray approximations) as a function of both the launch conditions and the fiberparameters.
An equation coupling these parameters has been derived to achieve self-trapping conditions. Both the launch conditions for laser transmission at a gap, the fiber parameters, the maximum axial position, and the resulting period length are investigated under a wide ranges of variation.
Thermal effects in that fiber the maximum axial temperature are linearly correlated, thus taking into account the coupling of the laser beam and fiber along its axis, and avoiding the paraxial approximations, the maximum axial temperature is derived and investigated. The obtained calculations indicates that the thermal effects can be reduced by employing optical fiber with suitable refractive index spatial profile as well as a suitable launch conditions.
The analysis and the obtained calculations indicate the impact of irradiance tialoring as agood technique to reduce the severe thermal effects caused by launching powerful lasers into optical fiber link (W-shaped )
The tailored spatial profiles of TEM00, TEM01, and TEM02 modes of either positive radial gradiences are investigated.It is found that, whatever the irradiance mode, irradiance of negative radial gradient produce less temperature rise and consequently less thermal effects than those of positive radial gradient
dimensionless thermooptic figure of merit for optical fiber links is derived and employed as a good integral technique for measuring the bit- rate, dispersion effects, thermooptic and thermomechanical effects caused by powerful optial pulses propagating in binary fiber temperature-dependent characteristics.
To paraxially achieve a good power gathering efficiency as well as small thermal effects, an optimization technique is suggest and employed to evaluate the suitable launch conditions as well as the suitable fiber parameters.