Passive thermal compensation of all-fiber mach-zehnder interferometer
AssigneeITF Optical Technologies Inc.
InventorsFrancois Gonthier, Francois Seguin, Nicolas Godbout, Alain Villeneuve
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Abstract
The invention provides an all-fiber Mach-Zehnder interferometer in which the composition of one of the arms, which connect the couplers, or of a segment of such arm, is doped with dopants, such as GeO2, P2O5, B2O3 and F. The doping is adjusted to obtain a desired thermal dependence of the interferometer within a given temperature range. The segments can further be tapered with an adiabatic taper.
Claims15
An all-fiber Mach-Zehnder interferometer (MZI) having two optical couplers and two arms made of optical fibers extending between and connecting said couplers so as to form a phase shift region between said couplers with a predetermined optical path length difference, characterized in that the composition of at least a segment of one or both of said arms is so doped as to provide a desired thermal dependence in the MZI within a predetermined temperature range.
Method of providing passive thermal compensation in an all-fiber MZI which has two optical couplers and two arms made of optical fibers extending between and connecting said couplers so as to form a phase shift region between said couplers with a predetermined optical path length difference, said method comprising adjusting the composition of at least a segment of one or both of said arms so as to obtain a desired thermal dependence of the MZI within a predetermined temperature range.
Dependencies are inferred from the claim text.