FIELD

The subject matter herein generally relates to optical communications.

BACKGROUND

Optical communications have low transmission loss, high data confidentiality, total immunity to electromagnetic interference (EMI), and wide bandwidth. The optical communication module receives inward optical signals and converts the optical signals into electrical signals. The optical communication module can also convert electrical signals into optical signals, and then transmit the optical signals outward.

Conventional optical-communication modules use the wavelength-division multiplexing filter (WDM filter) to achieve the function of two-way communication, so that a single optical-communication module can receive and can output optical signals, thereby increasing the efficiency of communication. The current level of communication efficiency of such optical-communication module is less than optimal.

