P. G. J. Wigley

Pulse shaping, compression, and pedestal suppression employing a nonlinear-optical loop mirror.

We study the shaping of picosecond-duration optical pulses by the intensity-dependent transmission characteristics of a fiber loop mirror in the normally dispersive region. Experimental results for sech(2) intensity input profiles are in good agreement with the theoretical predictions. In addition, input pulses with substantial background radiation emerge both compressed and pedestal free.

Subpicosecond-pulse generation through cross-phase-modulation-induced modulational instability in optical fibers

We report subpicosecond-pulse generation at 1.319 microm in a single-mode optical fiber by modulational instability induced through cross-phase modulation by 1.06-microm pulses propagating in the normal dispersion regime. Pulse-repetition rates approaching 300 GHz were achieved.

Picosecond pulse generation from a continuous-wave diode laser through cross-phase modulation in an optical fiber

Picosecond pulses have been generated from a cw diode-laser source using cross-phase modulation from a cw-pumped mode-locked Nd:YAG laser operating at 1.06 microm. By tuning the diode laser in the region near 1.5 microm, the effect of group-velocity mismatch can be minimized, making efficient use of the fiber length and optimizing the cross-phase modulation spectral broadening.

Tunable, femtosecond soliton generation from amplified continuous-wave diode-laser signals

Solitons with pulse widths as short as 200 fsec have been generated through the preferential amplification of a seed signal from a continuous-wave diode laser by Raman amplification from a mode-locked Nd:YAG laser.

Soliton generation through Raman amplification of noise bursts

Operating in a high-gain regime, solitons with durations of the order of 600 fsec have been generated through the synchronous Raman amplification of noise bursts with durations of the order of 100psec and inverse bandwidths in the regime of the generated solitons.

Soliton generation through Raman amplification of pulses with sub fundamental soliton powers

Abstract Stimulated Raman scattering has been used to provide rapid gain, over relatively short fibre lengths, to pulses with powers below the critical fundamental soliton power, giving rise to soliton formation.

Modulational instability from a mode-locked erbium-doped fiber laser

Abstract The 100 picosecond pulses from a mode-locked erbium-doped fiber laser have been used to generate modulational instability signals at rates of around 0.3 THz, for peak powers in the region of 1 W launched into dispersion-shifted single-mode fiber.

A synchronously pumped dispersion compensated fibre Raman ring laser around 1.4 μm

A synchronously pumped intracavity dispersion compensated fibre-Raman ring oscillator operating around 1.4 μm is described. Pulses as short as 1.8 ps and average output powers of 20 mW (∼100 W peak) were obtained, by synchronously pumping a 400 m length of single mode, nonpolarization preserving dispersion shifted optical fibre (λ0=1.46 μm) with the 100 ps pulses from a cw mode locked Nd: YAG laser at 1.32 μm. This laser provides a simple source of pulses for soliton studies.

Amplification of Picosecond Pulses in Neodymium-doped Single-mode Optical Fibres

Abstract The picosecond pulses from the output of a fibre-grating pair compressed mode-locked c.w. pumped Nd : YAG laser have been amplified in a neodymium-doped single mode optical fibre using a counter propagating c.w. pump geometry. Gains of up to times ten were measured in a 2·5 m fibre length for input signal energies of up to 0·2 pJ per pulse.

Picosecond pulse amplification in a single mode neodymium doped fibre

The pulses from a fibre‐grating compressed mode locked cw pumped Nd:YAG laser have been amplified in a Nd doped single mode fibre using a counter propagating pumping geometry. Grains of up to times ten were measured for signal energies of up to 0.2pJ per pulse.