Patent ID: 8218973

Claim:
An optical transmitter device, comprising: an optical transmitter module; and a printed circuit board which is electrically connected to the optical transmitter module, wherein the optical transmitter module comprises: a light emitting device; an optical modulator configured to modulate light emitted from the light emitting device; and a first termination resistor circuit which is electrically connected to the optical modulator, wherein the printed circuit board comprises: a signal output circuit configured to output a signal supplied to the optical modulator; and a second termination resistor circuit which is electrically connected to the signal output circuit, wherein the first termination resistor circuit comprises a first resistor device, a resistance value of which is Rterm, and a first capacitor device, a capacitance value of which is Cterm; wherein the second termination resistor circuit comprises a second resistor device, and an inductor device, an inductance value of which is Lterm; and wherein a relational expression ( R term)^2 *C term×2/3 <=L term<=( R term)^2 ×C term*3/2 is satisfied, and wherein an impedance of the first termination resistor circuit in a pass frequency band thereof is substantially equal to an impedance of the second termination resistor circuit in a pass frequency band thereof.