Abstract: A purpose of the present invention is to provide a low relative phase noise optical comb generation device in which a repetitive frequency of an interference signal of an optical comb is stabilized by reducing a relative phase noise of driving signals with different frequencies for driving multiple optical comb generators in an optical comb distance meter.

Abstract: The present disclosure describes an optical waveguide provided with an incident side reflection film and an emission side reflection film to resonate light incident via the incident side reflection film and formed to penetrate from the incident side reflection film to the emission side reflection film for propagating resonated light. The disclosure also includes a substrate to which the optical waveguide is formed from a top surface thereof and a first protection member and a second protection member formed with a material corresponding to a material of the substrate, wherein the first protection member and the second protection member are arranged on the optical waveguide such that one end facet of the first protection member forms an identical plane with a first end facet of the substrate including an optical incident end.