Grating based communication switching

Details Grating based communication switching Grating based communication switching

2000-12-15

2003-02-18

Le, Thien M. (Department: 2876)

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

C356S305000

Reexamination Certificate

active

06522404

ABSTRACT:

STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT
Not Applicable
BACKGROUND OF THE INVENTION
Spectrometers are known and used to provide a spectral image of a scene.
FIG. 8
illustrates an example of a known spectrometer
800
. In this spectrometer
800
, light from an image
810
passes through a slit
820
and a first concave mirror
830
of a reflective assembly
835
receives an image
812
. The first mirror
830
is in a light path from the slit
820
and reflects light to a convex diffraction grating
860
. The convex diffraction grating
860
receives the reflected light from the first mirror
830
. The diffraction grating
860
spectrally disperses the image received from the first mirror
830
into a spectral image
814
. A second concave mirror
840
of the reflective assembly
835
receives the spectral image
814
from the diffraction grating
860
and reflects the spectral image
814
to a detector
850
, such as a CCD array of a camera or other device.
Preferably, the diffraction grating
860
is a known aberration corrected convex diffraction grating, which provides for simultaneous high spatial and spectral imaging resolution and low distortion. By using the aberration corrected convex diffraction grating, the spectrometer
800
provides a high resolution that may function for a wide variety of applications such as optical communication channel switching.
BRIEF SUMMARY OF THE INVENTION
An optical communication channel switch includes an aberration corrected spectrometer adapted for receiving plural channels of communication in a one dimensional array of sites where each site corresponds to a source, and a channel selector for selectively switching channels. After receiving the plural channels, the aberration corrected spectrometer provides the channels in a two dimensional array in which channels are distributed in rows (or columns) of similar frequency and different sources and in columns (or rows) of differing frequency and common sources. The channel selector selectively switches channels among sites in the two dimensional array and provides a single dimensional reconfigured array of frequency separated channels that is combined into the two dimensional array. Another aberration corrected spectrometer receives the selectively switched two dimensional array and combines the channels into a single dimensional array of sites having one or more frequency separated channels.


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