140 research outputs found
Fast Characterization of Dispersion and Dispersion Slope of Optical Fiber Links using Spectral Interferometry with Frequency Combs
We demonstrate fast characterization (~1.4 microseconds) of both the
dispersion and dispersion slope of long optical fiber links (~25 km) using dual
quadrature spectral interferometry with an optical frequency comb. Compared to
previous spectral interferometry experiments limited to fiber lengths of
meters, the long coherence length and the periodic delay properties of
frequency combs, coupled with fast data acquisition, enable spectral
interferometric characterization of fibers longer by several orders of
magnitude. We expect that our method will be useful to recently proposed
lightwave techniques like coherent WDM and to coherent modulation formats by
providing a real time monitoring capability for the link dispersion. Another
area of application would be in stabilization of systems which perform
frequency and timing distribution over long fiber links using stabilized
optical frequency combs.Comment: 3 pages, 3 figures, Minor changes to tex
Dispersion requirements in coherent frequency-to-time mapping
The article of record as published may be located at https://doi.org/10.1364/OE.19.024718Funded by Naval Postgraduate SchoolThe frequency-to-time mapping technique (also known as the temporal far-field phenomenon) usually requires a significant amount of dispersion to stretch an ultrashort optical pulse so that the intensity profile becomes a scaled replica of its optical spectrum. In this work, we study the near-to-far-field transition and find that the far-field condition can be relaxed in some cases relevant for radio-frequency (RF) waveform generation. This observation has allowed us to achieve intensity signals with an ultrabroad RF bandwidth content.This project was supported in part by the Naval Postgraduate School under grant N00244-09- 1-0068 under the National Security Science and Engineering Faculty Fellowship program.This project was supported in part by the Naval Postgraduate School under grant N00244-09- 1-0068 under the National Security Science and Engineering Faculty Fellowship program
Tunable Frequency Comb Generation from a Microring with a Thermal Heater
We demonstrate a novel comb tuning method for microresonator-based Kerr comb
generators. Continuously tunable, low-noise, and coherent comb generation is
achieved in a CMOS-compatible silicon nitride microring resonator.Comment: submitted to CLEO201
Gaussian-shaped Optical Frequency Comb Generation for Microwave Photonic Filtering
Using only electro-optic modulators, we generate a 41-line 10-GHz
Gaussian-shaped optical frequency comb. We use this comb to demonstrate
apodized microwave photonic filters with greater than 43-dB sidelobe
suppression without the need for a pulse shaper.Comment: 3 pages, 4 figure
Dispersion requirements in coherent frequency-to-time mapping
The frequency-to-time mapping technique (also known as the
temporal far-field phenomenon) usually requires a significant amount of
dispersion to stretch an ultrashort optical pulse so that the intensity profile
becomes a scaled replica of its optical spectrum. In this work, we study the
near-to-far-field transition and find that the far-field condition can be
relaxed in some cases relevant for radio-frequency (RF) waveform
generation. This observation has allowed us to achieve intensity signals
with an ultrabroad RF bandwidth contentThis project was supported in part by the Naval Postgraduate School under grant N00244-09-
1-0068 under the National Security Science and Engineering Faculty Fellowship program.
Any opinion, findings, and conclusions or recommendations expressed in this publication are
those of the authors and do not necessarily reflect the views of the sponsors. Victor Torres-
Company gratefully acknowledges funding from a Marie Curie International Outgoing
fellowship (project PIOF-2009-234996
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