Patent ID: 8744219

Claim:
An optical modulator module comprising: an optical modulator that modulates an input optical signal; and m (2≦m, m is an integer) individual driving circuits connected in cascade, wherein the optical modulator comprises: an optical waveguide that guides the optical signal; and at least m waveguide-type optical phase modulator regions arranged on the optical waveguide, wherein an i (1≦i≦m, i is an integer)-th individual driving circuit comprises: a driving circuit that outputs a signal obtained by amplifying a digital input signal in synchronization with a clock signal to an i-th waveguide-type optical phase modulator region; and a phase shift circuit that applies a delay to at least a signal branched from the clock signal and outputs the signal, and wherein a j (2≦j≦m, j is an integer)-th individual driving circuit receives a signal output from the phase shift circuit of a (j−1)-th individual driving circuit as the clock signal.