Flexible circuit board, light receiving/transmitting assembly, optical module, and connection method

A method for connecting a flexible circuit board and an optical device, characterized by comprising:

• providing a flexible circuit board, the flexible circuit board comprising a top metal layer, a substrate, and a ground zone sequentially stacked in a thickness direction, wherein the top metal layer defines a high-speed signal line and an auxiliary ground reference disposed around the high-speed signal line, wherein the auxiliary ground reference is electrically connected to the ground zone via an auxiliary conductive hole, and wherein the flexible circuit board is further provided with a high-speed signal via pad and a ground via pad;
• adding solder into the auxiliary conductive hole;
• inserting a high-speed pin and a ground pin of the optical device into the high-speed signal via pad and the ground via pad, respectively, from one side of the ground zone of the flexible circuit board;
• and
• heating and melting the solder, such that the solder electrically connects the ground zone to a ground base of a housing of the optical device.

A method for connecting a flexible circuit board and an optical device, characterized by comprising:

• providing a flexible circuit board, the flexible circuit board including a high-speed signal line, a substrate, and a ground zone sequentially stacked in a thickness direction, and further comprising an auxiliary conductive hole, a high-speed signal via pad, and a ground via pad, wherein a distance between the auxiliary conductive hole and the high-speed signal via pad is less than a distance between the ground via pad and the high-speed signal via pad;
• adding solder into the auxiliary conductive hole;
• inserting a high-speed pin and a ground pin of the optical device into the high-speed signal via pad and the ground via pad, respectively, from one side of the ground zone of the flexible circuit board;
• and
• heating and melting the solder, such that the solder electrically connects the ground zone to a ground base of a housing of the optical device.