| 摘要 |
An optical structure having two optical guidance paths between which coupling occurs in a band about one predetermined wavelength is manufactured by providing an optical structure having two optical guidance paths with respective propagation constants 12', 14' which vary differently with wavelength and coincide at one given wavelength lambda ' arranged such that coupling occurs between said optical guidance paths in a band about said one given wavelength and subjecting the or at least one of the guidance paths which includes a radiation responsive refractive index changing dopant to radiation to change the propagation constant thereof until said one given wavelength equals said one predetermined wavelength lambda ''. <IMAGE> |
