A bi-directional optical transceiver module comprising: an optical transmission unit configured to output a transmission signal, wherein the transmission signal is an upstream signal having a first wavelength value (λ1) an optical reception unit (130,250) configured to receive an input of a reception signal, wherein the reception signal is a downstream signal having a second wavelength value (λ2) and the first wavelength value (λ1) and the second wavelength value (λ2) are different from each other; a splitter inclined with respect to an incident direction of the transmission signal output from the optical transmission unit and configured to output said transmission signal to an outside and to reflect optical signals input from the outside, the optical signals comprising said reception signal; a reflected light-blocking optical filter unit (140,230) configured to pass, as the reception signal among the optical signals reflected by said splitter, an optical signal within a preset wavelength range including the second wavelength value (λ2) so as to block all of an internal reflection signal input to the optical reception unit (130,250) and an external reflection signal, and to separate the first wavelength (λ1) of the transmission signal such that the optical signal corresponding to the reception signal having the second wavelength value (λ2) is incident on the optical reception unit (130,250), wherein the optical signal is converted in a form of parallel light; and a parallel light lens arranged between said splitter and said reflected light-blocking optical filter unit (140,230) and configured to convert and output the reflected optical signals in a form of the parallel light, wherein the parallel light lens includes an incident surface and a light emission surface opposite to the incident surface, the reflected optical signals are received by the incident surface, and the parallel light is emitted through the light emission surface, and the light emission surface is flat characterized in that said first and second wavelength values are allocated within a single Coarse-Wave-Division-Multiplexing, CWDM, channel. an optical transmission unit configured to output a transmission signal, wherein the transmission signal is an upstream signal having a first wavelength value (λ1) an optical reception unit (130,250) configured to receive an input of a reception signal, wherein the reception signal is a downstream signal having a second wavelength value (λ2) and the first wavelength value (λ1) and the second wavelength value (λ2) are different from each other; a splitter inclined with respect to an incident direction of the transmission signal output from the optical transmission unit and configured to output said transmission signal to an outside and to reflect optical signals input from the outside, the optical signals comprising said reception signal; a reflected light-blocking optical filter unit (140,230) configured to pass, as the reception signal among the optical signals reflected by said splitter, an optical signal within a preset wavelength range including the second wavelength value (λ2) so as to block all of an internal reflection signal input to the optical reception unit (130,250) and an external reflection signal, and to separate the first wavelength (λ1) of the transmission signal such that the optical signal corresponding to the reception signal having the second wavelength value (λ2) is incident on the optical reception unit (130,250), wherein the optical signal is converted in a form of parallel light; and a parallel light lens arranged between said splitter and said reflected light-blocking optical filter unit (140,230) and configured to convert and output the reflected optical signals in a form of the parallel light, wherein the parallel light lens includes an incident surface and a light emission surface opposite to the incident surface, the reflected optical signals are received by the incident surface, and the parallel light is emitted through the light emission surface, and the light emission surface is flat characterized in that said first and second wavelength values are allocated within a single Coarse-Wave-Division-Multiplexing, CWDM, channel.