A photoelectric conversion assembly configured to be engaged with optical transmission member for transmitting light including: a photoelectric conversion module, wherein said photoelectric conversion module comprises an interposer , at least one optical element and an optical bench : : wherein said interposer has a conductive trace and first conductive pads formed on said interposer and a plurality of through holes , each passing through a top surface to a bottom surface of said interposer ; wherein said at least one optical element is configured on said interposer and coupled to said conductive trace ; wherein said optical bench includes a first concave portion configured to fix said interposer , and wherein said interposer is configured within said first concave portion , the optical bench further including at least one lens array and a mirror , wherein one of said at least one lens array is configured to align with said at least one optical element, wherein said mirror is configured to reflect light emitted by said at least one optical element or to reflect light created by an external device to be received by said at least one optical element ; wherein each of said plurality of through holes of said interposer aligns to said at least one lens array of said optical bench and aligns to an active area of said at least one optical element for facilitating light passing said plurality of through holes ; a circuit board for supporting said photoelectric conversion module, wherein said circuit board has second conductive pads for coupling said photoelectric conversion module and said first conductive pads of said interposer and has a circuit board concave portion , wherein said at least one optical element is embedded into said circuit board concave portion such that said at least one optical element faces to said circuit board concave portion . wherein said interposer has a conductive trace and first conductive pads formed on said interposer and a plurality of through holes , each passing through a top surface to a bottom surface of said interposer ; wherein said at least one optical element is configured on said interposer and coupled to said conductive trace ; wherein said optical bench includes a first concave portion configured to fix said interposer , and wherein said interposer is configured within said first concave portion , the optical bench further including at least one lens array and a mirror , wherein one of said at least one lens array is configured to align with said at least one optical element, wherein said mirror is configured to reflect light emitted by said at least one optical element or to reflect light created by an external device to be received by said at least one optical element ; wherein each of said plurality of through holes of said interposer aligns to said at least one lens array of said optical bench and aligns to an active area of said at least one optical element for facilitating light passing said plurality of through holes ; a circuit board for supporting said photoelectric conversion module, wherein said circuit board has second conductive pads for coupling said photoelectric conversion module and said first conductive pads of said interposer and has a circuit board concave portion , wherein said at least one optical element is embedded into said circuit board concave portion such that said at least one optical element faces to said circuit board concave portion . <EOS>