Abstract
We report the first experimental breakthrough of a net gain of optical
signals in a broadband chromium-doped fiber amplifier (CDFA) for
next-generation optical communication systems. Current fiber amplifiers,
including commercial erbium-doped fiber amplifier, cover only a relatively
small portion of the entire transmission bandwidths (1300–1600 nm) of
the low-loss windows of silica fibers. The newly developed CDFAs have opened
up the possibility of utilizing the 300-nm entire spectrum of the low-loss
fibers to further increase the transmission capacity. In this paper, we
present the experimental demonstration of a net gain of 1.2 dB employing
gain enhancement technique. With the help of an optical-fiber system
examination for the CDFA, a 40-Gb/s error-floor free data transmission was
successfully demonstrated by realizing the high-speed transmission of signal
with gain through the chromium-doped fibers (CDFs). Further gain improvement
in the CDFAs employing few-mode or single-mode CDFs will be presented and
discussed.
© 2012 IEEE
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