Optical module

An optical module, comprising:

• a housing;
• an optical adapter attached to an end portion of the housing;
• and
• an optical transmitter and receiver assembly mounted in the housing,
• wherein the optical transmitter and receiver assembly comprises a TOSA comprising a plurality of light-emitting elements for outputting optical signals, a ROSA comprising a light-receiving element for inputting optical signals, and a circuit board electrically connected to the TOSA and the ROSA,
• wherein the TOSA further comprises a TOSA base arranged in an optical adapter side of the housing, the TOSA base including two side surfaces opposite and parallel to each other, the plurality of light-emitting elements being installed on the two parallel side surfaces respectively so that optical paths of light emitted from the plurality of light-emitting elements are parallel to each other,
• wherein the circuit board comprises a first flexible substrate, which is mounted with the TOSA, and a first rigid substrate, which is coupled to the first flexible substrate, and
• wherein the first flexible substrate comprises a TOSA base-facing portion, which is opposite the TOSA base, and a plurality of joining portions, which extend from both ends, respectively, of the TOSA base-facing portion and which are joined to the plurality of light-emitting elements respectively, wherein the plurality of joining portions comprise a first joining portion, which is joined to the light-emitting elements arranged on one of the two side surfaces, and a second joining portion, which is joined to the light-emitting elements arranged on another of the two side surfaces, wherein the first joining portion and the second joining portion extend from the TOSA base-facing portion, in directions opposite and parallel to each other.