| 摘要 |
The present invention provides a compact, broad-band, and low-drive-voltage optical modulator module capable of generating any multilevel optical modulation signal simply by inputting a digital signal. The optical modulator module according to an exemplary aspect of the present invention includes a digital segmented electrode structure optical modulator (1) and m individual driving circuits (21). The digital segmented electrode structure optical modulator (1) includes semiconductor optical waveguides (11) and at least m waveguide-type optical phase modulator regions (14). An i-th individual driving circuit (21) includes a driving circuit (24) and a phase shift circuit (25). The driving circuit (24) amplifies a digital input signal (Di) in synchronization with a clock signal (CLK) and outputs the signal to an i-th waveguide-type optical phase modulator region (14). The phase shift circuit (25) applies a delay to a signal branched from the clock signal (CLK). A j-th individual driving circuit (21) receives an output signal from the phase shift circuit (25) of a (j-1)-th individual driving circuit (21) as a synchronization signal. |
