Patent ID: 8693816

Claim:
A method for manufacturing an optical duplexer intended to receive light at a first optical wavelength and to transmit back light at a second optical wavelength, the method comprising the steps of: forming on a first silicon wafer a photoreceptor of the first optical wavelength comprising semiconductor regions, respectively heavily doped of a first conductivity type, intrinsic, and heavily doped of a second conductivity type, and coating the assembly with a planar bonding layer, forming on a second SOI-type wafer, in the upper silicon layer of the SOI structure, a waveguide adapted to receive light at the second optical wavelength, having a surface comprising a grating which is transparent for the first optical wavelength and diffracting for the second optical wavelength and depositing successive layers forming a selective filter letting through the first optical wavelength and not the second optical wavelength and coating the assembly with a planar bonding layer, and bonding the surface opposite to the substrate of the first wafer to the surface opposite to the substrate of the second wafer and removing the silicon substrate of the second wafer.