By Luc Thévenaz
This booklet offers a finished remedy of the sphere of contemporary fiber optics, starting with the fundamentals of the sector summarized in an introductory bankruptcy. specialist individuals then subject matters reminiscent of polarization results in optical fibers photonic crystal fibers highly-doped optical fibers non-linear results amplification and lasing in optical fibers supercontinuum new release, Rayleigh and inelastic scattering with purposes to sensing optical fiber aspect sensors, and polymer optical-fiber-based sensors.
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Additional resources for Advanced Fiber Optics
The combined effect of birefringence and polarization mode coupling results in a dispersion phenomenon (broadening of the optical pulses launched in the fiber): polarization mode dispersion. This important feature for optical communication systems is described in the last part of this chapter. 1 Polarized and unpolarized light In homogeneous media, as well as in optical fibers under the quite practical condition of the weakly guiding approximation (see Sect. 3), light is transversely polarized so 30 Advanced Fiber Optics that the electric and magnetic fields are perpendicular to the direction of propagation.
If the light source emits a monochromatic wave (a single frequency), the light is fully polarized. However, in many cases it is not possible to clearly define a polarization state for an optical wave: the electric field vector can randomly vary in the transverse plane and the tip does not describe a well defined pattern. In these cases, the light is said to be unpolarized. This is typically the case of a broadband light such as sunlight: the polarization behavior of each frequency is different and it is therefore not possible to deduce a well defined polarization state.
In the case of a linear polarizer, the transmitted polarization is linear. It can be shown that the Jones matrix of such a device is given by : cos2 u sin u cos u J= sin u cos u sin 2 u where u is the azimuth of the transmission axis of the linear polarizer. In the case of a circular polarizer, the transmitted polarization is circular. 42) for a right-handed and a left-handed circular polarizer, respectively. Jones matrices expressed in an arbitrary basis The preceding examples are Jones matrices obtained in the Cartesian xy coordinate system.