Patent ID: 6198857
Filing Date: 2001-03-06
Classification: G02B,H04J

Abstract:
An optical multiplexing device comprising a filter assembly defining a light path from a common port to at least a first channel port, a second channel port and a pass-through port, in that order, the common port and pass-through port each being substantially transparent to at least a wavelength range, the first channel port comprising a first optical filter element being substantially transparent to a wavelength sub-range within the wavelength range of the common port and substantially reflective of other wavelengths within the wavelength range, and the second channel port comprising a second optical filter element having light transmittance and reflectance properties substantially identical to those of the first optical filter element such that a channel signal having the wavelength sub-range can be transmitted out of the light path at the first channel port, and a new channel signal having substantially the same wavelength sub-range can be transmitted in to the light path at the second channel port.