Abstract
Broadband quantum noise suppression of light is required for many applications, including detection of gravitational waves, quantum sensing, and quantum communication. Here, using numerical simulations, we investigate the possibility of polarization squeezing of ultrashort soliton pulses in an optical fiber with an enlarged mode field area, such as large-mode area or multicore fibers (to scale up the pulse energy). Our model includes the second-order dispersion, Kerr and Raman effects, quantum noise, and optical losses. In simulations, we switch on and switch off Raman effects and losses to find their contribution to squeezing of optical pulses with different durations (0.1–1 ps). For longer solitons, the peak power is lower and a longer fiber is required to attain the same squeezing as for shorter solitons, when Raman effects and losses are neglected. In the full model, we demonstrate optimal pulse duration (~0.4 ps) since losses limit squeezing of longer pulses and Raman effects limit squeezing of shorter pulses.
Highlights
We consider a polarization squeezing of optical solitons in a silica fiber with enlarged mode field area and with the decreased nonlinear Kerr coefficient γ compared to a standard telecom fiber SMF-28e (Aeff ~80 μm2 for SMF-28e)
We study the influence of Raman effects and linear losses on the squeezing of ultrashort solitons with different durations
We investigated numerically polarization quantum noise squeezing for ultrashort solitons with 0.1–1 ps durations in a silica fiber with enlarged mode field area
Summary
Broadband quantum noise suppression of light is desirable for many applications, including detection of gravitational waves, quantum sensing, and quantum communication [1]. The first long-term application of quantum squeezed light for a gravitational-wave observatory was reported in [2]. In new detectors of gravitational waves, an injection of −10 dB squeezed light is required and studies in this direction are in progress [3]. With regard to quantum communications, the first implementation of an entirely guided-wave optical setup for generation and detection of squeezed light at a telecommunication wavelength was reported in [4]. The development and investigation of methods for quantum noise suppression is of interest for many applications. When studying optical pulses in fibers, quasi-particle excitations called solitons play a special role in the spectral region of anomalous dispersion because of their remarkable stability [5,6,7]
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