Optical Comb Generation Device

An optical comb generation device for an optical comb distance measurement for measuring a distance from a time difference between an interference signal of a measuring light and an interference signal of a reference light, comprising:

• N signal sources for outputting N types of modulation signals with mutually different modulation frequencies phase-locked to a reference frequency signal as driving signals;
• an optical comb generation unit comprising N optical comb generators for generating N types of optical combs with mutually different modulation frequencies by respectively modulating a phase or an intensity periodically and driven by the driving signals output from the N signal sources;
• an optical switch with N inputs and M outputs for outputting M types of optical combs with mutually different modulation frequencies by cyclically selecting from N types of optical combs generated by the N optical comb generators comprised in the optical comb generation unit;
• and
• an optical switch control unit for controlling an operation to select optical combs by the optical switch by synchronizing to the reference frequency signal.