Abstract
All-optical
regeneration has attracted growing interest due to the possibility to increase
the all-optical reach. However, to be really competitive with optoelectronic
regenerators, all-optical regenerators should process an entire wavelength
division multiplexed (WDM) signal comb at once and significantly reduce the
footprint and the power consumption, as possible, in principle, by exploiting
photonic-integrated circuits (PICs). Moreover, since constant envelope modulation
format signals have come into play in recent years, all-optical regenerators
dealing with a multiplex of these signals are of particular interest. This
paper presents a monolithically integrated indium-phosphide-based PIC acting
as an all-optical regenerator for constant envelope WDM signals. The regeneration
scheme is based on hard-limiting amplification in saturated semiconductor
optical amplifiers (SOAs), which removes the signal intensity noise. The presented
PIC, designed and fabricated within the JePPIX technology platform, can handle
up to four WDM signals, which are demultiplexed and enter an array of SOAs
to undergo regeneration before being multiplexed again. The channel-by-channel
regeneration of both polarization shift keying and frequency shift keying
signals at 10 Gb/s is experimentally demonstrated in terms
of Q-factor improvement.
© 2012 IEEE
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