Patent ID: 6661945
Filing Date: 2003-12-09
Classification: G01J,G02B

Abstract:
A multi-band optical system applicable to dense wavelength division multiplexing (DWDM), comprising:a first transmission optical grating through which the â€œCâ€  band of wavelengths in the range of approximately 1530 to 1565 nm transitions to a plurality of dispersed wavelengths at a fold angle; a second transmission optical grating supported adjacent to the first transmission optical grating through which the â€œLâ€  band of wavelengths in the range of approximately 1575 to 1610 nm transitions to a plurality of dispersed wavelengths at substantially the same fold angle; and wherein: a) one or more optical fibers or waveguides carry each band of wavelengths to the gratings, and an optical detector converts the dispersed wavelengths into electrical signals for use as an optical spectrum analyzer; b) one or more optical fibers or waveguides carry each band of wavelengths to the gratings, and a plurality of fibers or waveguides each receives one of the dispersed wavelengths from the grating for use as an optical demultiplexer, or c) a plurality of fibers or waveguides are carry used to carry separate wavelengths to the grating, and the grating combines the separate wavelengths an optical fiber or waveguide receives the non-dispersed band of wavelengths from the grating for use as an optical multiplexer.