Patent ID: 7883278

Claim:
An optical module comprising: a plurality of leads extending from one or more sealing members, at least portions of the leads being mounted on a circuit board at respective mounting positions arranged along only two parallel, non-overlapping rows on the circuit board, each of the rows having a plurality of mounting positions, at least one of the rows containing at least three of the respective mounting positions; an optical semiconductor for emitting or receiving an optical signal; and a circuit portion embedded in at least one sealing member and the at least one sealing member forming a lens, and the circuit portion connected to the optical semiconductor, for transmitting a pair of differential signals to or receiving a pair of differential signals from the circuit board through a pair of differential signal leads of the leads, the pair of differential signal leads connecting the circuit portion and the circuit board, wherein the pair of the differential signal leads are adjacent to each other, mounted on the circuit board in a first of the two rows, and parallel so that a distance between the differential signal leads remains constant from a lower surface of the one or more sealing members to an upper surface of the circuit board, the distance between the pair of the differential signal leads is determined by measuring the distance between two respective edges of the pair of the differential signal leads that are farthest away from each other, the leads form a zigzag pattern so that imaginary columns intersect each row at each of the leads, the imaginary columns being orthogonal to the rows, each imaginary column containing only one lead, and there is no lead in a second of the two rows between the imaginary columns that intersect the differential signal leads.