Phase-sensitive amplification in dispersion oscillating fibers

Abstract

The modulation of the dispersion along the fiber length is responsible for the emergence of multiple resonant sidebands, which arise due to modulation instability. We propose to use modulation instability (MI) sidebands for phase-sensitive amplification (PSA). An accurate analytical treatment of the PSA process in dispersion oscillating fibers is provided. The analytical model agrees well with results of numerical calculations. The phase-to-phase and phase-to-amplitude transfer functions are demonstrated. We find that the gain depends both on the modulation phase of the fiber dispersion and the individual phases of interacting waves. The effect of the pump depletion on the shift of resonant frequencies of MI sidebands is described. We show that MI sidebands can be used for the squeezing of the phase and amplitude of the signal wave. We demonstrate that parametric amplification in dispersion oscillation fibers accompanies a reduction of the stimulated Brillouin scattering.

Advancements in Optical Communication Research: A Review of India's Progress

“…Specialty fibers such as multi-core fibers, few mode fibers are explored for their application in space division multiplexing in our lab -optical communication engineering and networking at IIT Madras. In our group, the dispersion engineered fibers are designed and tested for parametric oscillator by suppressing stimulated Brillouin scattering as a part of a bilateral Indo-Russian Project [24]. Our work is in collaboration with industry partner-Sterlite Technology Limited (STL) who manufactures optical fibers of commercial grade, starting from the perform.…”

A Comprehensive Study on Phase Sensitive Amplification and Stimulated Brillouin Scattering in Nonlinear Fibers with Longitudinally Varying Dispersion

“…where A(z, T) is the time domain complex amplitude of the wave propagating along z, T = t − β 1 z is the retarded time. The variation of β 2 , β 3 and β 4 with fiber core radius are modeled as linear functions [24] following the numerical results discussed in Section 2.1. We utilize a split-step Fourier method (SSFM) to solve the NLSE.…”

“…Contrary to the single pump configuration, the dual pump configuration enjoys the advantage of not requiring a copier stage for achieving PSA functionality when operated in a degenerate signal-idler mode [5,23]. Recently, the case of a dual-pump PSA with a dispersion oscillating fiber was investigated analytically in [24]. However, the question of whether a sinusoidal dispersion profile is the optimal profile for attaining a large PSA gain is still an open one.…”

“…For a dual pump configuration, synchronous phase modulation of the pumps can avoid such effects [37], however such active processes come with additional complexity and often is detrimental for the noise performance of the system. Another remedy towards the SBS problem runs in the lines of varying the properties of the fiber along the fiber length, dispersion being one of them [15,24,38]. Dispersion variation along the fiber length can be achieved by varying the radius of the fiber preform along the length while pulling it from a drawing tower.…”