Patent ID: 8828174

Claim:
In a method of fabricating a plurality of integrated optical devices by means of a wafer-scale process, a method of manufacturing a wafer stack comprising at least one optical wafer, the method comprising the steps of: providing a first and a second wafer and a spacer arrangement; bringing the first wafer and a first side of the spacer arrangement together, with a first portion of a curable adhesive between the first wafer and the spacer arrangement; bringing the second wafer and a second side of the spacer arrangement together, with a second portion of a curable adhesive between the second wafer and the spacer arrangement; aligning the first and second wafers to each other; and thereafter transferring an assembly comprising said first and second wafers and said spacer arrangement to a separate curing stage without applying to said assembly pressing or holding or clamping forces for fixing the assembly during transfer; and simultaneously curing the first and the second portion of curable adhesive in said separate curing stage.