Optical network device and method for packaging optical network device

A method for packaging optical network device, comprising:

• combining a fiber to a guide hole located at a top of a packaging cap so as to guide the fiber to extend through the guide hole to an accommodating space of the packaging cap;
• aligning a transceiver port of the fiber with a photonic integrated circuit on a substrate;
• fixing a normal vector of a plane where the photonic Integrated circuit is located and the transceiver port of the fiber to present an oblique angle so that the photonic integrated circuit receives and transmits at least one optical signal according to the oblique angle, comprising:
• coupling a first optical signal from the plane where the photonic Integrated circuit is located to the transceiver port of the fiber according to the oblique angle by an inverse design structure of a wavelength division multiplexing coupler of the photonic integrated circuit;
• receiving a second optical signal from the transceiver port of the fiber according to the oblique angle by the inverse design structure;
• and
• splitting the second optical signal into a first optical receiving signal and a second optical receiving signal by the inverse design structure;
• and
• combining the packaging cap with the substrate so that the accommodating space of the packaging cap covers the photonic integrated circuit.