Patent ID: 7463659

Claim:
An optical transmitting module, comprising: a semiconductor laser diode with impedance, the laser diode having a first electrode and a second electrode; a first resistor with first resistance, the first resistor having a first terminal and a second terminal; a second resistor with second resistance, the second resistor having a first terminal and a second terminal; and a CAN package for enclosing said laser diode, said first resistor and said second resistor, said package including a metal base, a metal block provided on said metal base and having a side surface for mounting said laser diode through a heat sink made of insulating material with a thermal conductivity, and first and second leads each secured to said metal base and electrically isolated from said metal base, said first and second leads each having impedance and a flat side surface in an end portion thereof for mounting said first and second resistors thereon, respectively, said first terminal of said first resistor being connected to said first electrode of said laser diode and said second terminal of said first resistor being connected to said first lead, said first terminal of said second resistor being connected to said second electrode of said laser diode and said second terminal of said second resistor being connected to said second lead, wherein said laser diode is thermally isolated from said first and second resistors, and wherein the sum of the impedance of the laser diode, the resistance of the first resistor and the impedance of the first lead is equalized to match the input impedance of the optical transmitting module to the transmission line connected to the first lead, and the sum of the impedance of the laser diode, the resistance of the second resistor and the impedance of the second lead is equalized to match the input impedance of the optical transmitting module to the transmission line connected to the second lead.