Patent ID: 7577328

Claim:
An optical reflector comprising: an optical propagating region causing optical strength distributions depending on respective wavelengths of lights to be propagated in the optical propagating region, and defined by a light-focusing element, a grating, a multimode optical waveguide, a Mach-Zehnder interferometer, or a directional optical coupler, a first and second optical input/output means, each being connected to one side of the optical propagating region; a mirror disposed on the other side of the optical propagating region; and a first optical filter disposed in the optical propagating region between the first and second optical input/output means and the mirror; wherein the first optical filter reflects a light having a first wavelength and allows another light having a second wavelength to be transmitted therethrough; and the mirror reflects the light having the second wavelength, so that the lights having the first and second wavelengths are respectively reflected at the first optical filter and the mirror and thus are propagated between the first input/output means and the second input/output means, and wherein a distance between the first and second input/output means and the first optical filter and a distance between the first and second input/output means and the mirror are respectively and independently defined according to amounts of insertion loss regarding the light having the first wavelength and the other light having the second wavelength.