OPTICAL MODULATION DEVICE

摘要

PURPOSE:To enable high-speed optical modulation only by light signals without electronic circuit of optical modulator by cascade-connecting n-stages of optical modulators and setting the phases of modulated input pulse light so as to vary these phases from each other. CONSTITUTION:Four stages of optical modulators 101 to 104 having optical nonlinear media to which input pulse light of a specified repeating period t and the modulated input pulse light of the repeating period t/m and spectral demultiplexers which remove the output light of the wavelengths of the modulated input pulse light from the output light of the optical nonlinear media and output the modulated output light are cascade-connected and the phases of the modulated input pulse light are so set as to vary from each other. The optical nonlinear media are media to generate four-light wave mixed waves from the input pulse wave and the modulated input pulse light. The pulse light of the specified repeating period t is given the modulated input pulse light of the repeating period t/n and is modulated in the optical nonlinear media. The modulation method includes a induction phase shift type to change the phases or an induction frequency shift type to change frequencies.