Patent ID: 7986020

Claim:
An optical communication module, comprising: an optical device; a main board incorporating a signal generation circuit for generating a high frequency signal corresponding to an optical signal converted by the optical device; and a flexible printed circuit board for connecting the optical device with the main board, wherein the flexible printed circuit board comprises: a signal wiring pattern comprising: a first transmission line for connecting an end of the optical device with an end of the signal generation circuit; and a second transmission line for connecting another end of the optical device with another end of the signal generation circuit; a thin film resistor layer formed in a region including at least a part of a region facing the signal wiring pattern so as to constitute a first microstrip line together with each of the first transmission line and the second transmission line; a ground layer formed in a region except a part of a region facing the thin film resistor layer within a region including a region facing the signal wiring pattern so as to constitute a second microstrip line together with the each of the first transmission line and the second transmission line; and an insulating layer formed between each two of the signal wiring pattern, the thin film resistor layer, and the ground layer.