| 主权项 |
1. A method for adjusting an interferometer to have maximum extinction ratio, the method comprising:
providing an interferometer comprising a first wave splitter having an input I1-1 and having outputs O1-1 and O1-2, a phase adjuster, and a second wave splitter having inputs I2-1 and I2-2 and having outputs O2-1 and O2-2; wherein O1-1 is connected to I2-1 and O1-2 is connected to I2-2, wherein the phase adjuster provides a relative phase θ between these two connections; wherein the first wave splitter has an adjustable first split error E1=R1−½, wherein R1 is a power transmittance from I1-1 to O1-1; wherein the second wave splitter has an adjustable second split error E2=R2−½, wherein R2 is a power transmittance from I2-1 to O2-1; wherein the interferometer has a bar state where θ is selected to maximize transmission from I1-1 to O2-1 relative to transmission from I1-1 to O2-2; wherein the interferometer has a cross state where θ is selected to maximize transmission from I1-1 to O2-2 relative to transmission from I1-1 to O2-1; performing an automatic adjustment that includes an alternating sequence of the following steps: i) adjusting E1 and E2 to optimize cross state performance, wherein changes to E1 and E2 are linked such that their values change by substantially equal amounts; ii) adjusting E1 and E2 to optimize bar state performance, wherein changes to E1 and E2 are linked such that their values change by substantially equal and opposite amounts. |
