The role played by optical interference in determining the complex degree of coherence of an electromagnetic field propagating in a fiber waveguide is examined under different conditions of the source spatial and temporal coherence. In particular, the optical interference is examined by evaluating the modulus and the phase of the complex degree of both spatial and temporal coherence at the exit face of two-mode step-index fiber waveguide excited by spatially coherent and quasi-monochromatic source. Moreover, by introducing the averaging operation over a statistical ensemble of fiber waveguides, the statistical quantities of the optical field at the output of the fiber waveguide can be determined.
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