Patent ID: 6445493
Filing Date: 2002-09-03
Classification: G02B,H01S,H04B

Abstract:
A compound gain flattening filter comprising:at least first and second sets of filter sub-components together approximating a single set of filter components defined by a best fit algorithm that determines central wavelengths of response for the filter components to approach a desired spectral filter response; at least one sub-component of said first set exhibiting a central wavelength of response shifted in a positive direction from the central wavelength of a corresponding component determined by the best fit algorithm; at least one sub-component of said second set exhibiting a central wavelength of response shifted in a negative direction from the central wavelength of the same corresponding component determined by the best fit algorithm; and said at least first and second sets being combined for producing an actual spectral filter response that is closer to the desired filter response than a filter response of the single set of filter components in which the corresponding filter component exhibits an actual central wavelength similarly shifted in either direction from the central wavelength determined by the best fit algorithm.