Abstract
A experimental study on short pulse generation from praseodymium-doped fluoride mode-locked fibre lasers and gain-switched DFB semiconductor laser is presented[l]. The fiber lasers were modelocked either by using a phase modulator (PM) or cross phase modulation (XPM). In the first case, pulses of 33 ps and 75 mW (peak power) at 419 MHz were obtained. In the second case, we used a 1.55 µn gain-switched diode laser to modulate the phase of the 1.3 um laser field via intracavity XPM. This produced 50 ps, 13 mW pulses at 2.8 GHz. In this second laser we also observed stable dark pulses with 140 to 220 ps duration, making this laser attractive as a dark soliton generator. In the case of the gain-switched (GS) diode laser, we obtained (after spectral filtering) 5 ps, 20 mW at 1 GHz. Using this GS laser we propagated solitons in 50 km of standard fibre, thus demonstrating its potentials as a simple and inexpensive soliton quality laser source.
Highlights
To provide future multimedia services, ultra high speed photonic networks will need to convey information at rates of the order of 100 GbitJs
We present an actively mode-locked Pr3+-doped fibre laser which could provide the basis for an ultrafast source or a clock for a high speed network based at 1.3 urn, In this experiment, pulse duration of - 30 ps have been generated at a repetition rate of 419 MHz with an average output power of 1 mW
We suggest that the combination of self-phase modulation (SPM) and large normal dispersion associated with the Pr3+ fibre are responsible for the increased time-bandwidth product
Summary
To provide future multimedia services, ultra high speed photonic networks will need to convey information at rates of the order of 100 GbitJs. We present an actively mode-locked Pr3+-doped fibre laser which could provide the basis for an ultrafast source or a clock for a high speed network based at 1.3 urn, In this experiment, pulse duration of - 30 ps have been generated at a repetition rate of 419 MHz with an average output power of 1 mW. We present measured and calculated results for the dispersion, nonlinearity and birefringence of such a fluoride fibre, and evaluate their influence on a mode-locked fibre laser behavior. This experiment was supported by theoretical analysis including computer simulations. We report generation and amplification of -5 ps duration pulses from a gain-switched 1.32 I-lID DFB laser using a praseodymium doped fibre amplifier, PDFFA, and their subsequent soliton transmission over 50 km of standard telecommunication fibre
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