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Published on: November 7, 2013
Squeezing Phase Diffusion
Simone Cialdi1,2, Edoardo Suerra1,2, Stefano Olivares1,2
1Dipartimento di Fisica "Aldo Pontremoli," Università degli Studi di Milano, I-20133 Milano, Italia.
Optical parametric oscillators (OPOs) can reduce phase noise in coherent signals. A threshold in phase noise must be overcome for OPOs to effectively "squeeze" noise, depending on input energy and OPO parameters.
Area of Science:
- Quantum optics
- Nonlinear optics
- Photonics
Background:
- Phase diffusion degrades coherent signal integrity.
- Optical parametric oscillators (OPOs) are nonlinear optical devices with potential for noise manipulation.
Purpose of the Study:
- To investigate the use of OPOs for counteracting phase diffusion.
- To demonstrate phase-noise reduction in coherent signals using a tuned OPO.
Main Methods:
- Theoretical analysis of phase-noise dynamics in OPOs.
- Experimental demonstration of phase-noise squeezing using a suitable OPO setup.
Main Results:
- A threshold value for phase noise was identified, above which OPOs can effectively reduce noise.
- The OPO's phase-noise squeezing capability is dependent on input coherent state energy.
- Key OPO parameters, including gain and loss rates, influence the noise reduction threshold.
Conclusions:
- OPOs offer a viable method for mitigating phase noise in coherent optical signals.
- The effectiveness of OPOs in phase-noise reduction is contingent upon operating above a specific noise threshold and optimizing OPO parameters.
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