My question relates to fiber optics, and probably also general optics. I have a broadband SLD source, which can be depolarized by a broadband fiber depolarizer. If I place a Fabry-Perot filter with low bandwidth between the source and depolarizer, I assume this reduces the linewidth going into the depolarizer and means the depolarizer has to be longer and more expensive to be able to handle this reduced linewidth of source. What if a broadband depolarizer was used to depolarize the broadband source, and then the FP filter was placed after the depolarizer. Would the filtered light still be depolarized, or would this have the same effect as placing the filter before the broadband polarizer (i.e. the light would not be properly depolarized because the linewidth at the input is too low)? Thanks.