All-optical phase-regenerative multicasting of 40 Gbit/s DPSK signal in a degenerate phase sensitive amplifier

We demonstrate all-optical 1-to-5 differential phase-shift keyed (DPSK) wavelength multicasting at 40 Gbit/s using a degenerate four-wave mixing (FWM) based phase sensitive amplifier (PSA). Phase regenerative properties are reported with a sensitivity improvement of more that 10 dB

Saturation effects in degenerate phase sensitive fiber optic parametric amplifiers

We experimentally study saturation effects in degenerate phase sensitive amplifiers, revealing and explaining a gain regime suitable for all-optical signal processing functions such as phase regeneration

All-optical phase and amplitude regeneration properties of a 40 Gbit/s DPSK black-box phase sensitive amplifier

We experimentally study the pure amplitude and phase regeneration capabilities of a blackbox degenerate four wave mixing (FWM) based bit-rate-flexible phase sensitive amplifier (PSA) for a 40 Gbit/s differential phase-shift keyed (DPSK) signal

Silica-based highly nonlinear fibers with a high SBS threshold

Results on suppression of stimulated Brillouin scattering in highly nonlinear fibers with germanium-doped core as well as aluminum-doped core based on spooling the fiber with a linear strain gradient is presented

All-optical signal processing in highly nonlinear fibres

We review our recent work demonstrating two all-optical signal processing devices using high SBS threshold alumino-silicate highly nonlinear fibers

All-optical phase regeneration of 40Gbit/s DPSK signals in a black-box phase sensitive amplifier

We present a black-box four wave mixing based bit-rate-flexible phase sensitive amplifier and use it in the first demonstration of 40 Gbit/s DPSK phase regeneration

Generation of high repetition rate (>100 GHz) ultrastable pulse trains from a coherent optical beat-signal through non-linear compression using a high SBS-threshold fiber

A stable beat-signal produced by two comb-phase-locked CW lasers separated by >100 GHz is nonlinearly compressed in a high SBS-threshold highly nonlinear fibre

Stable and efficient generation of high repetition rate (>160 GHz) subpicosecond optical pulses

A stable optical beat-signal with frequency >160GHz is produced by injection-locking two narrow-linewidth semiconductor lasers emitting at frequencies spaced by the beat-frequency to a low-jitter 10 GHz optical comb. The generated beat-signal with broadband noise suppression of > 75dB is temporally compressed by factors of up to four in a high stimulated Brillouin scattering threshold aluminosilicate highly nonlinear fiber. The generated subpicosecond pulses have a root mean square (rms) timing jitter below 150 fs measured over 1 s

Brillouin Suppressed Highly Nonlinear Fibers

Methods for suppression of stimulated Brillouin scattering in highly nonlinear fibers are reviewed. Emphasis is paid to SBS suppression by aluminum doping of the core. New results for a HNLF with an aluminum doped core and reduced loss are presented

Recent advances in highly nonlinear fibres

We review recent progress in the areas of silica and compound glass based highly nonlinear fibres, highlighting and contrasting the current start-of-the-art, merits, drawbacks and future potential of both approaches