Patent ID: 8923660

Claim:
An optical phase shifter comprising: a first waveguide phase shifter configured to phase shift a transverse electric (TE) polarized component of an input optical signal by a first phase shift to produce a TE polarized component of a first phase shifted optical signal, and configured to phase shift a transverse magnetic (TM) polarized component of the input optical signal by a second phase shift to produce a TM polarized component of the first phase shifted optical signal; a first polarization rotator configured to rotate the TE polarized component of the first phase shifted optical signal to produce a TM polarized component of a rotated optical signal, and configured to rotate the TM polarized component of the first phase shifted optical signal to produce a TE polarized component of the rotated optical signal; and a second waveguide phase shifter configured to phase shift a TE polarized component of the rotated optical signal by a third phase shift to produce a TE polarized component of a second phase shifted optical signal, and configured to phase shift the TM polarized component of the rotated optical signal by a fourth phase shift to produce a TM polarized component of the second phase shifted optical signal, wherein the first waveguide phase shifter, the first polarization rotator, and the second waveguide phase shifter are integrated on a single substrate.