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Influence of surface roughness on the bandwidth of optical multimode waveguides analyzed by modal noise theory

2003; SPIE; Linguagem: Inglês

10.1117/12.505775

1996-756X

Oliver Stuebbe, Thomas Bierhoff, Juergen Schrage, G. Mrozynski,

Advanced Fiber Optic Sensors

Modal noise is an undesired modulation of the guided light intensity in a multimode waveguide. Applying the frequency correlation function the frequency dependence of this noise as well as the bandwidth of a multimode waveguide can be estimated. In this paper the existing model of the frequency correlation function for a waveguide with smoothed dielectric interfaces is enhanced to analyze the influence of surface roughness on the achievable bandwidth. This surface roughness is caused by the manufacturing process of the waveguides.