Abstract: An optical communication module being adapted to transmit a first optical signal to an optical transmitting device and receive a second optical signal is provided. The optical communication module includes a multi-mode distributed feedback laser diode (MM-DFB LD) and a receiver. The first optical signal is emitted by the MM-DFB LD and propagated by the optical transmitting device. The receiver is disposed at the propagating path of the second optical signal to receive the second optical signal propagated by the optical transmitting device. Moreover, another optical communication module having a lens with asymmetric numerical aperture (NA) is provided. Furthermore, an LD package includes a MM-DFB LD device with KL value ranged from 1.0 and 5.0 is further provided.