Spectrally resolved fast monitor
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United States of America Patent
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Aug 3, 2010
Grant Date -
Jan 1, 2009
app pub date -
Aug 5, 2008
filing date -
Oct 6, 2004
priority date (Note) -
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Abstract
A method and apparatus for monitoring spectral tilt uses an arrayed waveguide grating (AWG) to separate a multiplexed optical signal having a plurality of wavelength channels into a plurality of sub-bands, where each sub-band spans a different wavelength range and includes more than one wavelength channel. A photodetector array is provided to measure the optical power in each of the sub-bands, while control electronics calculate spectral tilt of the multiplexed optical signal using the measured optical power in each of the sub-bands. The spectral tilt monitor in accordance with the instant invention provides spectral resolution, increased monitoring speeds, and decreased manufacturing costs.
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