| 摘要 |
The invention concerns a device capable of being traversed by an optical wave and producing a filtering in the wavelength of said wave, wherein an optical parameter of the device varies along the wave path such that the device presents a series of sections (S-10-S10) each formed by two successive segments, one wherein the optical parameter values are less than a mean value, the other wherein the optical parameter values are higher than the mean value, and wherein the device has at least one zone (S-10-S10) wherein the sections (S-10-S10) have alternately lengths less and greater than the mean length of the sections on said zone (S-10-S10).
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