US 6,983,090 B2 | ||
High resolution tunable optical filter | ||
John Weber, Ottawa (Canada); Xiang Zhu, Ottawa (Canada); and Shane H. Woodside, Ottawa (Canada) | ||
Assigned to JDS Uniphase Inc., Ottawa (Canada) | ||
Filed on Mar. 11, 2003, as Appl. No. 10/384,821. | ||
Claims priority of provisional application 60/365772, filed on Mar. 21, 2002. | ||
Prior Publication US 2003/0179990 A1, Sep. 25, 2003 | ||
Int. Cl. G02B 6/26 (2006.01); G01J 3/28 (2006.01) |
U.S. Cl. 385—27 | 22 Claims |
1. An optical filter comprising:
an input port for launching an optical signal into the optical filter;
a collimator disposed for collimating light transmitted from the input port;
a dispersive element disposed for dispersing the collimated light according to wavelength in a dispersion plane;
a reflective retarder disposed for reflecting at least a portion of the dispersed light back to the dispersive element;
a focussing element disposed for receiving the light transmitted from the dispersive element and substantially focussing it
to a point; and
an output port disposed at the point for receiving the focussed light, wherein the reflective retarder is rotatable about
an axis substantially perpendicular to the dispersion plane for tuning the optical filter.
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