Patent ID: 11906784
Assignee: NOKIA SOLUTIONS AND NETWORKS OY
Field: Optics (Instruments)
Classification: CPC G  H | IPC G

Claim 17:
18. A method of manufacturing an optical apparatus, comprising:
forming a thermally tuned optical filter, including:
providing a semiconductor substrate;
depositing a dielectric layer on the semiconductor substrate;
forming a cavity in a surface of the semiconductor substrate wherein a membrane portion of the dielectric layer is located over the cavity in the surface of the semiconductor substrate;
forming a resistive heater layer on the membrane portion and forming an electrode layer connected to the resistive layer such that a temperature of the resistive layer is controllable by a current applied from the electrode layer to the resistive layer; and
positioning an etalon optical filter on the resistive layer and over the cavity, wherein an optical passband through the etalon optical filter is tunable by changing a refractive index of the etalon optical filter from the temperature change of the resistive layer.