INTERFERENCE SIGNAL STRENGTH ACQUISITION METHOD AND INTERFERENCE SIGNAL STRENGTH ACQUISITION DEVICE

摘要

In this interference signal strength acquisition method, a first optical frequency comb in which a repetition frequency is four times an offset frequency is generated, the first optical frequency comb is divided into second to fifth optical frequency combs, and the phase of the fourth optical frequency comb on a time axis is offset by 90° with respect to the phase of the fifth optical frequency comb on the time axis. In the interference signal strength acquisition method, the envelope strength of the following is acquired: an interference signal of the third and fourth optical frequency combs in which either of said optical frequency combs includes discretionary optical information; and an interference signal of the third and fifth optical frequency combs in which either of said optical frequency combs includes discretionary optical information.