Zolo Technologies, Inc.

Robert Harr

Andrew D Sappey

Pei Huang

Gerry Murphy

An apparatus for use in optical communication systems to multiplex/demultiplex an optical signal consisting of an optical channel(s) of distinct wavelength(s) having a select channel spacing within a select wavelength range. The apparatus includes a plurality of optical waveguides aligned generally along the same optical axis with each having a propagating end. At least two of the optical waveguides each propagate a distinct multiplexed optical signal comprising a plurality of channels, with the multiplexed optical waveguides being arranged in a multiplexed linear array. The others of the optical waveguides are single channel waveguides arranged in a two dimensional array with linear rows perpendicular to the multiplex linear array and with each linear row corresponding to a multiplex optical waveguide. A reflective echelle grating is optically coupled to the plurality of optical waveguides along the optical axis and receives an optical signal emitted from at least one of the optical waveguides and detracts the optical signal(s) to at least one other of the optical waveguide(s).

Echelle grating dense wavelength division multiplexer/demultiplexer

A bulk optic (de)multiplexer for fiber optic communications systems includes a diffraction grating having a diffraction surface, a waveguide array including a plurality of waveguides having an input/output end for emitting and receiving optical signals, and a focusing optic in optical communication between the diffraction grating and the waveguide array along an optical axis. The focusing optic focuses beams from the diffraction surface of the grating for optical coupling with the input/output ends of the waveguides. The (de)multiplexer further includes a frame. A fixed mount is provided between the focusing optic and the frame. A first adjustable mount is provided between the waveguide array and the frame and a second adjustable mount is provided between the diffraction grating and the frame. Preferably, the optical axis corresponds to a Z axis of orthogonal X, Y, Z axes and the waveguides of the waveguide array are aligned with the input/output ends along an input/output axis. The first adjustable mount is configured to provide for linear movement of the waveguide array along the Z axis and movement of the input/output axis within a plane parallel to the X, Y axes. The second adjustable mount is preferably configured to provide only for gimbaled movement of the grating about the point on the diffraction surface of the grating intersecting the optical axis. A method of optically aligning a (de)multiplexer as described above includes affixing the focusing optic to the frame with the focusing optic defining the optical axis, moving the waveguide array relative to the focusing optic only linearly along the optical axis and moving the grating only by rotating the grating about three orthogonal axes at a point on the grating intersected by the optical axis.

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Arvada, CO, United States of America

Robert Harr