Decoherence due to XPM-assisted Raman amplification for polarization or wavelength offset pulses in all-normal dispersion supercontinuum generation

James S. Feehan, Jonathan H. V. Price

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Abstract

We report the importance of cross-phase modulation (XPM) on the coherence of a low-energy probe pulse co-propagating with a high-energy pump pulse which generates incoherent supercontinuum in all-normal dispersion (ANDi) fiber due to Raman amplification of quantum noise. By investigating numerous fiber and pulse parameters we show consistently that for weak probe pulses the XPM from the pump is the dominant influence on the degradation of the probe coherence. We show that the faster decoherence at the pump leading edge means that the probe coherence is reduced more significantly when the probe has a higher group velocity, i.e., when an orthogonally-polarized probe is aligned to the fast (lower refractive index) axis of the fiber or when a co-polarized probe has a longer central wavelength. Simulations show that this effect occurs for both polarization maintaining (PM) and non-PM ANDi fibers and can result in a probe decoherence rate which is higher than that of the pump. These previously unreported results extend our earlier scalar simulations showing incoherent supercontinuum within a singlepulse.
Original languageEnglish
Pages (from-to)635-644
Number of pages10
JournalJournal of the Optical Society of America B
Volume37
Issue number3
DOIs
Publication statusPublished - 11 Feb 2020

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probes
polarization
pulses
wavelengths
pumps
fibers
leading edges
group velocity
phase modulation
simulation
refractivity
degradation
scalars
energy

Keywords

  • cross-phase modulation
  • all-normal dispersion
  • pulse parameters

Cite this

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title = "Decoherence due to XPM-assisted Raman amplification for polarization or wavelength offset pulses in all-normal dispersion supercontinuum generation",
abstract = "We report the importance of cross-phase modulation (XPM) on the coherence of a low-energy probe pulse co-propagating with a high-energy pump pulse which generates incoherent supercontinuum in all-normal dispersion (ANDi) fiber due to Raman amplification of quantum noise. By investigating numerous fiber and pulse parameters we show consistently that for weak probe pulses the XPM from the pump is the dominant influence on the degradation of the probe coherence. We show that the faster decoherence at the pump leading edge means that the probe coherence is reduced more significantly when the probe has a higher group velocity, i.e., when an orthogonally-polarized probe is aligned to the fast (lower refractive index) axis of the fiber or when a co-polarized probe has a longer central wavelength. Simulations show that this effect occurs for both polarization maintaining (PM) and non-PM ANDi fibers and can result in a probe decoherence rate which is higher than that of the pump. These previously unreported results extend our earlier scalar simulations showing incoherent supercontinuum within a singlepulse.",
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TY - JOUR

T1 - Decoherence due to XPM-assisted Raman amplification for polarization or wavelength offset pulses in all-normal dispersion supercontinuum generation

AU - Feehan, James S.

AU - Price, Jonathan H. V.

PY - 2020/2/11

Y1 - 2020/2/11

N2 - We report the importance of cross-phase modulation (XPM) on the coherence of a low-energy probe pulse co-propagating with a high-energy pump pulse which generates incoherent supercontinuum in all-normal dispersion (ANDi) fiber due to Raman amplification of quantum noise. By investigating numerous fiber and pulse parameters we show consistently that for weak probe pulses the XPM from the pump is the dominant influence on the degradation of the probe coherence. We show that the faster decoherence at the pump leading edge means that the probe coherence is reduced more significantly when the probe has a higher group velocity, i.e., when an orthogonally-polarized probe is aligned to the fast (lower refractive index) axis of the fiber or when a co-polarized probe has a longer central wavelength. Simulations show that this effect occurs for both polarization maintaining (PM) and non-PM ANDi fibers and can result in a probe decoherence rate which is higher than that of the pump. These previously unreported results extend our earlier scalar simulations showing incoherent supercontinuum within a singlepulse.

AB - We report the importance of cross-phase modulation (XPM) on the coherence of a low-energy probe pulse co-propagating with a high-energy pump pulse which generates incoherent supercontinuum in all-normal dispersion (ANDi) fiber due to Raman amplification of quantum noise. By investigating numerous fiber and pulse parameters we show consistently that for weak probe pulses the XPM from the pump is the dominant influence on the degradation of the probe coherence. We show that the faster decoherence at the pump leading edge means that the probe coherence is reduced more significantly when the probe has a higher group velocity, i.e., when an orthogonally-polarized probe is aligned to the fast (lower refractive index) axis of the fiber or when a co-polarized probe has a longer central wavelength. Simulations show that this effect occurs for both polarization maintaining (PM) and non-PM ANDi fibers and can result in a probe decoherence rate which is higher than that of the pump. These previously unreported results extend our earlier scalar simulations showing incoherent supercontinuum within a singlepulse.

KW - cross-phase modulation

KW - all-normal dispersion

KW - pulse parameters

UR - https://www.osapublishing.org/josab/browse.cfm

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DO - 10.1364/JOSAB.379563

M3 - Article

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SP - 635

EP - 644

JO - Journal of Optical Society of America B

JF - Journal of Optical Society of America B

SN - 0740-3224

IS - 3

ER -