Journal
OPTICS LETTERS
Volume 30, Issue 6, Pages 634-636Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.30.000634
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We present a broadband optical parametric amplifier design using tapered gain and tandem chirped quasiphase-matching gratings to obtain flat gain and group-delay spectra suitable for applications such as ultrashort-pulse amplification and fiber-optic communication systems. Although a tapered-gain amplifier consisting of a single chirped grating can provide constant gain over a wide frequency range, it cannot be used to control the group delay across the spectrum. We propose controlling both the gain and the group delay profiles using a two-stage amplifier configuration, in which the idler of the first is used as the input signal of the second. (C) 2005 Optical Society of America.
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