Patent ID: 7553092

Claim:
An optical module comprising: an optical device mounted on a metal substrate; a signal line disposed on the substrate and electrically insulated from the substrate by a dielectric, said optical device and signal line electrically coupled to each other for delivering a radio frequency (RF) signal inputted from an external circuit to the optical device; a resistor separately disposed from the signal line and having one end connected with the optical device, said resistor disposed on the substrate and electrically insulated from the substrate by a dielectric; and a filter formed by a pattern of the signal line, the filter including a disconnection slot between a rear end of a first portion of the signal line and a front end of a second portion of the signal line, wherein an input impedance seen from the signal line is matched by the resistor and the RF signal continues past the disconnection slot and direct current (DC) is blocked by the disconnection slot.