Fast phase modulation of the arms of a fiberoptics Mach-Zehnder interferometer during the elongation of the second coupler

摘要

A method and apparatus for fabricating Mach-Zehnder interferometers. The first coupler in the interferometer is fabricated using known techniques and the coupling coefficient for the first coupler is measured. By plotting the envelope of the global coupling coefficient function, a function that is dependent solely on the coupling coefficients of the first and the second coupler, the coupling coefficient of the second coupler can be directly obtained.