Controlled chirp in optical devices

An electro-optic device, comprising:

• a plurality of waveguide pairs, each of the plurality of waveguide pairs including a first waveguide and a second waveguide, each of the plurality of waveguide pairs including a thin film lithium-containing (TFLC) electro-optic material and being configured to carry a first optical signal in the first waveguide and a second optical signal in the second waveguide;
• and
• a plurality of electrodes trios, each of the plurality of electrode trios including a differential electrode pair and a ground electrode, a first signal electrode of the differential electrode pair being proximate to a portion of the first waveguide, a second signal electrode of differential electrode pair being proximate to a region between the portion of the first waveguide and a portion of the second waveguide, the ground electrode being proximate to the portion of the second waveguide, and only the portion of the first waveguide being between the first signal electrode and the second signal electrode along an entire length of electro-optic modulation;
• at least one additional ground electrode, the first signal electrode and the second signal electrode of an electrode trio of the plurality of electrode trios being between the ground electrode of the electrode trio and an additional ground electrode of the at least one additional ground electrode;
• wherein each of the plurality of electrode trios is configured to provide a first modulation having a first magnitude to the first optical signal and a second modulation having a second magnitude to the second optical signal, the first magnitude being different from the second magnitude for at least one of the plurality of electrode trios such that at least one of the plurality of waveguide pairs has an engineered chirp.

A method, comprising:

• providing a first optical signal to a first waveguide including a first thin film lithium-containing (TFLC) electro-optic material;
• providing a second optical signal to a second waveguide including a second TFLC electro-optic material, an electro-optic device including the first waveguide and the second waveguide;
• and
• driving electrode signals through a plurality of electrodes including a first ground electrode, a first signal electrode, a second signal electrode, and a second ground electrode, the first signal electrode and the second signal electrode being between the first ground electrode and the second ground electrode, the first signal electrode and the second signal electrode being a differential electrode pair proximate to a portion of the first waveguide and proximate to a portion of the second waveguide, the electrode signals in the differential electrode pair being configured to provide a first modulation having a first magnitude to the first optical signal and a second modulation having a second magnitude to the second optical signal, the first modulation being different from the second modulation such that the electro-optic device has an engineered chirp;
• and
• wherein only the portion of the first waveguide or only the portion of the second waveguide is between the first signal electrode and the second signal electrode along an entire length of electro-optic modulation.