Patent Document ID: 20070279144
Application ID: 11444743
Patent Flag: 0

Claim One:
1. A method of optimizing the operation of an IQ modulator having at least one control signal, cosine and sine carrier work inputs and respective I and Q modulation inputs, the method comprising the steps of: (a) measuring as input parameters the relative amplitudes of, and the phase between, the sine and cosine carriers; (b) applying at least one control signal to the IQ modulator that affects its degree of optimal behavior; (c) applying to the I modulation input an I input value of zero volts, and then; (c1) applying to the Q modulation input at least four Q input values of different selected voltages; (c2) measuring a value for the summation of the modulated sine and cosine carriers for each of the different selected voltages of step (c1); (d) finding according to a numerical solution a first partial set of behavior parameters associated with steps (c1) and (c2); (e) applying to the Q modulation input a Q input value of zero volts, and then; (e1) applying to the I modulation input at least four I input values of different selected voltages; (e2) measuring a value for the summation of the modulated sine and cosine carriers for each of the different selected voltages of step (e1); (f) finding according to a numerical solution a second partial set of behavior parameters; (g) combining the first and second partial sets of behavior parameters to produce a complete set of behavior parameters; (h) repeating steps (a) through (g) a plurality of times with different values of the at least one control signal of step (b) to obtain a collection of complete sets of behavior parameters, each associated with a different value of the at least one control signal; (i) inspecting the collection of step (h) to identify a complete set in the collection that represents optimal operation of the IQ modulator; and (j) identifying a respective value of the at least one control signal associated with the complete step of step (i) as producing the optimal operation of the IQ modulator.