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

Claim 0:
1. An on-chip heater of an optical phase modulation device to induce a desired optical phase change in the optical phase modulation device, the on-chip heater comprising:
a heater circuit including a heater resistance which induces an optical phase change in the optical phase modulation device; and
a heater power controller operatively coupled to the heater circuit to directly monitor an electrical characteristic of the heater circuit and to control an input current to the heater circuit, the input current of the heater circuit being set based on the monitored electrical characteristic and a target value corresponding to the desired optical phase change;
wherein the heater power controller is configured to determine that the monitored electrical characteristic indicates that a first optical phase change being induced in the optical phase modulation device is different from the desired optical phase change by:
determining a first value based on the monitored electrical characteristic;
comparing the first value to the target value, the target value being representative of the desired optical phase change; and
when a difference between the first value and the target value has a first characteristic, determine that the first optical phase change is being induced.