Patent ID: 6826348
Filing Date: 2004-11-30
Classification: G02B

Abstract:
An apparatus for enabling the selection of at least one optical spectrum for an optical signal, comprising:an optical element having an input end and an output end; said input end including a first surface and a second surface, spaced apart from said first surface; said first surface including a first coating for passing a first desired optical spectrum for said optical signal and reflecting a remainder of said optical signal; said second surface including a second coating for reflecting said optical signal therefrom; a device for rotating the optical element about a longitudinal axis thereof from a first position to a second position; wherein in said first position, said optical signal passes through said first surface, is filtered by said first coating to provide said first desired optical spectrum, and is reflected by said second surface to said output end of said optical element having a first intensity; and in said second position said optical signal maintains said desired optical spectrum but includes a second intensity.