| Issue |
Europhys. Lett.
Volume 38, Number 5, May II 1997
|
|
|---|---|---|
| Page(s) | 335 - 340 | |
| Section | Classical areas of phenomenology | |
| DOI | https://doi.org/10.1209/epl/i1997-00248-2 | |
| Published online | 01 September 2002 | |
Photon number squeezing of spectrally filtered sub-picosecond optical solitons
Lehrstuhl für Optik, Physikalisches Institut der
Universität Erlangen Nürnberg, Staudtstr. 7/B2,
D-91058 Erlangen, Germany
Received:
31
January
1997
Accepted:
26
March
1997
Photon number squeezing of spectrally filtered optical solitons has been
observed in
the sub-picosecond regime, where the Raman effect changes the internal
quantum
structure of each pulse. 160 fs pulses were propagated down a 10 m optical
fibre of
anomalous group velocity dispersion. At energies below the soliton
energy subsequent spectral filtering with an optical band-pass squeezed
the directly
detected photocurrent fluctuations to 
dB (52%) below the
shot-noise
limit. This implies 4.5 dB (65%) of soliton photon number squeezing, if
detection
losses are taken into account. Using a spectral edge filter the spectral
components of
the pulses are shown to contribute asymmetrically to the squeezing due to
stimulated
Raman scattering.
PACS: 42.50.Dv – Nonclassical field states; squeezed, antibunched, and sub-Poissonian states; operational definitions of the phase of the field; phase measurements / 42.65.Tg – Optical solitons; nonlinear guided waves / 42.65.Dr – Stimulated Raman scattering; CARS
© EDP Sciences, 1997
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