Custom optical filters

Details Custom optical filters Custom optical filters

G - Physics

02

B

G02B 5/20 (2006.01) G02B 27/44 (2006.01) H01S 3/10 (2006.01)

Patent

CA 2270768

This invention relates generally to custom optical filters such as filters relating to, flat-top WDM multiplexer/demultiplexers, flat-top and peaky comb filters or reconfigurable add & drop filters. The embodiment disclosed below is based on mid-dispersion wavelength bands processing, wherein the optical spectrum is dispersed in two steps; in- between these two steps, the wavelength bands are manipulated in the focal plane, for example by being moved, reflected, absorbed, inverted, magnified or reduced to achieve a particular result. A masked mirror or masked transmissive element selects wavelength by position. The mask shape for relatively complex filtering functions is much simpler than currently used for collimated beams because of the correlation between position and wavelength. Inversion of channel bands or movement of channel bands in two dimensions in the focal plane, in particular, enables the construction of numerous useful devices. It is possible to realize custom flat-top optical filters, custom shaped optical filters, flat- top WDM multiplexer/demultiplexers, flat-top and peaky comb filters or reconfigurable add & drop filters.

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