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Abstract
We report the first experimental demonstration of parametric amplification and all-optical phase-preserving amplitude regeneration for a 640 Gbit/s return-to-zero (RZ) differential phase-shift keying (DPSK) optical time division multiplexed (OTDM) signal. In the designed gain-flattened single-pump fiber optical parametric amplifier (FOPA), 620 fs short optical pulses are successfully amplified with 15 dB gain with error-free performance and less than 1 dB power penalty. Phase-preserving amplitude regeneration based on gain saturation in the FOPA is carried out for optical signals with degraded optical signal-to-noise ratio. An improvement of 2.2 dB in receiver sensitivity at a bit-error-ratio of 10(-9) has been successfully achieved after regeneration, together with 13.3 dB net gain.
Highlights
Fiber optical parametric amplifiers (FOPAs) have proved themselves as multi-functional devices for amplification of optical signals with high gain, wide bandwidth, flexible operation spectral band and low noise, and as all-optical signal processing subsystems for frequency conversion, demultiplexing and regeneration [1,2,3]
We report the first experimental demonstration of parametric amplification and all-optical phase-preserving amplitude regeneration for a 640 Gbit/s return-to-zero (RZ) differential phase-shift keying (DPSK) optical time division multiplexed (OTDM) signal
In the designed gain-flattened singlepump fiber optical parametric amplifier (FOPA), 620 fs short optical pulses are successfully amplified with 15 dB gain with error-free performance and less than 1 dB power penalty
Summary
Fiber optical parametric amplifiers (FOPAs) have proved themselves as multi-functional devices for amplification of optical signals with high gain, wide bandwidth, flexible operation spectral band and low noise, and as all-optical signal processing subsystems for frequency conversion, demultiplexing and regeneration [1,2,3]. Even though FOPAs can simultaneously amplify and regenerate degraded signals thanks to the ultra-fast process of their gain saturation, which makes them highly suitable for high bit-rate applications [1], the regeneration of high-speed short pulses based on saturated FOPAs can be challenging, mainly due to the limited uniform gain bandwidth available in single-pump FOPAs and the generation of undesirable higher-order FWM products falling in the bandwidth of the data signal in dual-pump FOPAs. This paper extends our previous work in [17] and explores for the first time the use of singlepump FOPAs for the amplification and regeneration of a single wavelength channel 640 Gbit/s RZ-DPSK OTDM signal.
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