Abstract: An optical component of the present invention is compensated its optical dispersion, including third order dispersion, at low loss using optical dispersion compensating element comprising multi-layer film. In the optical component, an optical dispersion compensating element and a functional element are connected in series along an optical path.

Abstract: There is provided an optical resonator having good temperature characteristics, allowing mass-production, and having excellent long-term stability, and an optical resonator which constitutes a wavelength control module capable of coping with an increase in density of wavelength interval. The optical resonator has two substrates having a specified reflectance, disposed oppositely and parallel to each other through a spacer, so that the reflection surfaces become inside. The spacer is made from a material having a coefficient of linear expansion of almost zero, formed in a block with a specified thickness, and having a hollow part penetrating in the thickness direction. The hollow part communicates with the outside through a groove part, and the two substrates are joined on opposite end faces of the spacer in the thickness direction.

Abstract: An optical component of the present invention is compensated its optical dispersion, including third order dispersion, at low loss using optical dispersion compensating element comprising multi-layer film. In the optical component, an optical dispersion compensating element and a functional element are connected in series along an optical path.