Optical communication module and multi-mode distributed feedback laser diode

An optical communication module, being adapted to transmit a first optical signal to an optical transmitting device, and receive a second optical signal from the optical transmitting device, the optical communication module comprising:

• a distributed feedback laser diode (DFB LD), being adapted to emit a first optical signal to an optical transmitting device and transmitting the optical signal thereby;
• a receiver, being implemented on the path of the second optical signal to receive the second signal transmitted by the optical transmitting device;
• and
• a lens, being implemented between the DFB LD and the optical transmitting device, wherein the lens has a first numerical aperture at a first side towards the DFB LD and a second numerical aperture at a second side towards the optical transmitting device, the first numerical aperture being larger than the second numerical aperture.

A multi-mode distributed feedback laser diode (MM-DFB LD), comprising:

• a supporter;
• a MM-DFB LD device, which has a KL value ranged from 1.0 to 5.0, and is implemented on and electrically connected to the supporter, and has an optical outputting surface;
• and
• a cover, covering over the MM-DFB LD and at least a portion of the supporter.