Grating having reduced mode dispersion

Details Grating having reduced mode dispersion Grating having reduced mode dispersion

2007-05-24

2008-08-05

Font, Frank G (Department: 2883)

Optical waveguides

With optical coupler

Input/output coupler

C385S014000, C385S024000, C385S027000, C385S039000

Reexamination Certificate

active

07409123

ABSTRACT:
An optical device includes an echelle grating and input waveguide arranged such that the echelle grating receives an input signal that exits from a port of the input waveguide. The echelle grating is configured to reflect the input signal such that when the input signal has a plurality of channels, the input signal separates into output signals that each includes a different one of the channels. The device also includes a plurality of output waveguides that each includes a port positioned to receive one of the output signals. The output waveguides include central waveguides. The central waveguides are the three centermost output waveguides when the total number of output waveguides is odd and the two centermost output waveguides when the total number of output waveguides is even. The central waveguides are positioned such that the grating axis passes through the port associated with one of the central waveguides or passes between the ports associated with the central waveguides.

REFERENCES:
patent: 7248755 (2007-07-01), Sappey et al.
Densmore, A., “DWDM data receiver based on monolithic integration of an Echelle grating demultiplexer and waveguide photodiodes,” Electronics Letter, vol. 41, No. 13 (2005).
Doi, Y. et al, “Flat and high responsivity CWDM photoreceiver using silica-based AWG with multimode output waveguide,” Electronic Letters, vol. 39, No. 22 (2003).
Janz, S., “Planar waveguide Echelle gratings in silica-on-silicon,” IEEE Photonics technology letters, vol. 16, No. 12, 503-505(2004).
McGreer, K.A., “Diffraction from concave gratings in planar waveguides,” IEEE Photonics technology letters, vol. 7, No. 3, 324-326(1995).
Zhimin Shi, “A Hybrid diffraction method for design of etched diffraction grating demultiplexers,” J. Lightwave Technology, vol. 23, No. 3, 1426-1434 (2005).

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