Patent ID: 6560015
Filing Date: 2003-05-06
Classification: G02B,H04J

Abstract:
A dense wavelength division multiplexer for separating an optical signal into a plurality of optical channels, comprising:a first birefringent plate; a first and second half-wave plates, each partially optically coupled to the first birefringent plate, such that the first and second half-wave plates each is capable of intercepting approximately one-half of a signal from the first birefringent plate; a second birefringent plate optically coupled to the first birefringent plate and to the first and second half-wave plates on a side opposite to the first birefringent plate; a lens optically coupled to the second birefringent plate on a side opposite to the first and second half-wave plates; and a non-linear interferometer optically coupled to the lens and disposed at a distance equal to the focal length of the lens on a side opposite to the second birefringent plate, wherein the non-linear interferometer introduces a phase difference between at least two of the plurality of optical channels.