Process of assembling optical receiver module

A process of assembling an optical receiver module that receives a wavelength multiplexed signal that multiplexes optical signals attributed to wavelengths different from each other and generates electrical signals corresponding to the optical signals, the process comprising steps of:

• mounting a wavelength selective filter (WSF) on a carrier, the WSF transmitting a first wavelength multiplexed signal that multiplexes a portion of the optical signals, the WSF reflecting a second wavelength multiplexed signal that multiplexes rests of the optical signals;
• mounting a prism on the carrier, the prism including a first surface that reflects the wavelength multiplexed signal toward the WSF and a second surface that receives the second wavelength multiplexed signal reflected by the WSF;
• mounting a mirror on the carrier, the mirror reflecting the first wavelength multiplexed signal transmitting through the WSF;
• and
• mounting a first optical de-multiplexer (o-DeMux) and a second o-DeMux on the carrier, the first o-DeMux de-multiplexing the first wavelength multiplexed signal coming from the mirror, the second o-DeMux de-multiplexing the second wavelength multiplexed signal coming from the second surface of the prism.