Patent ID: 6192174
Filing Date: 2001-02-20
Classification: G02B

Abstract:
An apparatus for transmitting radiation of multiple wavelengths, comprising:a first input channel carrying radiation of one or more wavelengths;a first output channel;a second input channel carrying radiation of a first wavelength to be added;a second output channel for receiving radiation of at least one wavelength that is to be dropped; anda switch member with two filters between the channels, wherein the switch member is movable between two different positions between the channels, wherein when the member is in a first position, the radiation carried by the first and second input channels impinges on the first filter and when the member is in a second position, the radiation carried by the first and second input channels impinges on the second filter, said two filters being such that the first output channel receives all of the wavelengths except one in the radiation carried by the first input channel and the radiation of the first wavelength, and the second output channel receives the radiation of the one wavelength carried by the first input channel not received by the first output channel.