Patent ID: 11947200
Assignee: MACOM TECHNOLOGY SOLUTIONS HOLDINGS, INC.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 9:
10. An optical phase modulation device, comprising:
an input waveguide;
a reference arm waveguide optically coupled with the input waveguide;
a phase modulated arm waveguide optically coupled with the input waveguide;
an output waveguide optically coupled to the reference arm waveguide and the phase modulated arm waveguide; and
a heater including:
a heater resistance positioned to modulate light traversing the phase modulated arm waveguide,
a heater circuit operatively coupled to the heater resistance to provide a current to the heater resistance, and
a heater power controller operatively coupled to the heater circuit to directly monitor an electrical characteristic of the heater circuit and determine whether a first optical phase change is being induced in the phase modulated arm waveguide by comparing a first value, based on the monitored electrical characteristic of the heater resistance, to a target value representative of a desired optical phase change;
wherein the heater power controller responds to a difference between the first value and the target value having a first characteristic by controlling the current provided by the heater circuit to the heater resistance.