Method and device for adjusting modulation timing in optical communication system

Abstract

[Problem] To provide a new modulation timing adjustment method and device that can optimize the modulation timing of a modulator in the optical communication system. [Solution] A modulation timing adjustment device that adjusts modulation timing of a modulator 11 that modulates a train of light pulses PIN with a predetermined period, is provided. The device includes: a variance calculator 14 that calculates a variance V of a detection signal DS of an output light pulse POUT of the modulator 11; and a controller 15 that, while shifting the modulation timing of the modulator 11, obtains the variance V of the detection signal DS at each modulation timing, and adjusts the modulation timing based on the variance V, wherein the controller 15 determines a modulation timing at which the variance V reaches a maximum as a criterion for determining an optimal modulation timing.

Dependencies are inferred from the claim text.