All-fibered high-quality 40-GHz to 200 GHz pulse sources based on nonlinear compression of besselons

Anastasiia Sheveleva,Christophe Finot

doi:10.1051/epjconf/202023811007

Anastasiia Sheveleva, Christophe Finot

Open Access

https://doi.org/10.1051/epjconf/202023811007

Copy DOI

Abstract

We experimentally demonstrate the generation of pulse trains with repetition rates of 40-GHz, 80 GHz and 200 GHz. Our approach is based on the nonlinear compression of besselon pulses in a highly-nonlinear fiber with normal dispersion. The pulses are of high quality, with a subpicosecond duration.

Highlights

Generation of very low duty-cycle high-quality optical pulse trains at repetition rate of several tens of GHz around 1.5 μm has become increasingly interesting for many scientific applications such as optical sampling or ultrahigh capacity transmission systems based on optical time division multiplexing
We have found that the nonlinear propagation in a normally dispersive fiber followed by a dispersive anomalous device [5] provides the best temporal profiles with reduced pedestals
The temporal profile is made of 5.3 ps close to Gaussian pulses without any visible background between two pulses

Summary

Introduction

Generation of very low duty-cycle high-quality optical pulse trains at repetition rate of several tens of GHz around 1.5 μm has become increasingly interesting for many scientific applications such as optical sampling or ultrahigh capacity transmission systems based on optical time division multiplexing. We have proposed to improve this last scheme by imprinting a triangular spectral phase profile instead of a quadratic one [3], which has enabled to generate a Fourier-transform limited waveform we named besselon [4]. A linear spectral shaper is inserted to imprint a triangular spectral phase profile namely a series of /2 spectral phase shifts between each spectral component. This converts the initial phase modulation into a train of Fourier-transform limited pulses. The normal chirp of the pulses is cancelled to a large extend by imprinting a quadratic spectral phase with a programmable spectral filter [5]. Results at the different stages are monitored using an optical sampling oscilloscope, an intensity autocorrelator and a highresolution optical spectrum analyzer

Principle and experimental setup

Results at 40 GHz

Doubling and quintupling of the repetition rate