Optical receiver module

An optical receiver module based on a wavelength division multiplexing (WDM) technology, comprising:

• a demultiplexer routing a plurality of multiplexed optical signals to different optical paths depending on their wavelengths;
• an optical device including a mirror and a plurality of lenses, wherein the mirror is configured to reflect the optical signals, which are separated by the demultiplexer and are propagated along a horizontal direction, toward a vertical direction, and the lenses are configured in such a way that the optical signals to be reflected from the mirror transmit therethrough;
• a plurality of photodetectors provided spaced apart from the lenses to convert the optical signals transmitted from the lenses into electric signals, respectively;
• and
• a flexible printed circuit board configured to transmit the electric signals converted by the photodetectors to an external circuit,
• wherein the plurality of the lenses and the plurality of the photodetectors are fabricated in a form of a single array,
• the flexible printed circuit board comprises a first electrode layer for transmitting the electric signals to the external circuit and a second electrode layer for supplying a ground potential, and
• the first and second electrode layers are provided in a form of a microstrip line, and the flexible printed circuit board has a via-hole-free structure.