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Phase coherence of optical waveguides

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4 Author(s)
Adar, R. ; AT&T Bell Labs., Murray Hill, NJ, USA ; Henry, C.H. ; Milbrodt, M.A. ; Kistler, R.C.

The effective refractive index of real waveguides is not constant, but fluctuates as a result of variations in composition and waveguide dimensions. Consequently, the accumulated phase during propagation has a component that undergoes a random walk and whose mean square increases with length ⟨Δφ2⟩=2L/Lcoh. These phase fluctuations result in wavelength fluctuations in Mach-Zehnder interferometers, especially in interferometers of low order. By measuring these fluctuations for Mach-Zehnder interferometers of different order, we have verified the above relation and determined that Lcoh≈27 m for our phosphorus-doped core silica on silicon waveguides

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Lightwave Technology, Journal of  (Volume:12 ,  Issue: 4 )