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A fiber optical parametric amplifier followed by a conventional amplifier can help reduce internal nonlinear crosstalk, while exhibiting a low noise figure. We review this concept and present our recent experimental results validating it.
Four-wave mixing between two initial closely-spaced pumps can generate mixing tones which deplete the initial pumps, and reduce total stimulated Brillouin scattering compared to a single pump. We present theoretical and experimental results confirming this reduction. This mechanism explains why it is actually possible to obtain large gains in some fiber optical parametric amplifiers, without requiring...
We have obtained record gain of 60 dB with a continuous-wave two-pump fiber optical parametric amplifier, over a 5.5-nm bandwidth. We used a 500-m long fiber, and 1.5 W of pump power.
We propose and demonstrate improvement of optical signal-to-noise ratio of a high-power pump by saturated stimulated Brillouin amplification of a backward seed in a fiber. A 27-dB improvement was obtained for a 1-W pump.
A phase-sensitive amplifier followed by a phase-insensitive one can have a noise figure well below 3dB. This can be used for reducing the detrimental nonlinear effects occurring in fiber optical parametric amplifiers for optical communication.
We investigate to what extent the unique features of OPAs (large bandwidths, 0 dB noise figure, phase conjugation, signal regeneration) can be combined and exploited in future long-haul communication networks. Network PMD can complicate the use of phase-sensitive amplification.
We review our investigations on bismuth-oxide fiber as an amplifying medium for parametric amplifiers with continuous-wave pumping. The results lead to new applications in demultiplexing, which are discussed.
We report on a CW fiber OPO whose output wavelength can be tuned over the 1463-1674 nm range. Over 1 W of output power can be extracted at long wavelengths. The signal 3-dB signal linewidth is about 0.08 nm.
We report high-capacity (> 1 Tb/s) amplification by a fiber optical parametric amplifier in different roles displaying compatibility and versatility in future WDM networks with phase-shift keying modulation format.
The burst-mode amplification performance of a fibre optical parametric amplifier (FOPA) is experimentally investigated. Compared to an EDFA, no serious transient effect was observed for amplified optical packets even with a low traffic granularity, due to the fast response of the FOPA.
We have experimentally shown that gain clamping is required in fiber optical parametric amplifiers. By using optical gain clamping (OGC), we have reduced gain variation to 1 dB, for signal input variation of 12 dB.
We report less than 1-dB cross-talk penalty for 26 DWDM channels modulated at 43.7 Gb/s RZ-DPSK when amplified by a fiber optical parametric amplifier showing compatibility with high-capacity (> 1 Tb/s) communication systems.
We report on a CW fiber OPO, whose output wavelength can be tuned over the 1463-1674 nm range, by means of a tunable intracavity filter. Over 1 W of output power can be extracted at long wavelengths.
We report operation of a continuous-wave one-pump fibre OPA with net gain between 1447 nm and 1717 nm. We used a 114 m long step-index highly-nonlinear fibre, and 5 W of pump power.
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