Soliton phase jitter control by use of super-Gaussian filters

Various Dispersion Compensation Techniques for Optical System: A Survey

“…He introduces super-Gaussian filters which can fully suppress phase jitter and greatly control the self frequency shift in ultrashort optical pulse. They are more effective than conventional filters, like Fabry Perot and Gaussian filters [37,38]. Y.J.…”

Phase jitter control of ultrashort solitons by use of Butterworth filters and nonlinear gain

“…However, without in-line control (η n = γ 1 = γ 2 = 0), for ultrashort solitons, we have σ 2 (Z) = 2M/75[(50 + 25s 1 )Z 3 − 8s 1 s 2 Z 5 ] + (π 2 /3 + 4)MZ, i.e., the phase jitter obtains a quintic growth with distance due to higher-order effects. Whereas for long solitons, the phase jitter obtains a cubic growth with distance [5,8]. This shows the need which Butterworth filters and nonlinear gain suppress the growth of phase jitter.…”

“…As a numerical example for Butterworth filters with n = 2, we used lumped filters with the equivalent distributed fil- ter strength η 2 = 0.123 [5,8]. The amplifier spacing Z a = 45 km.…”

“…Nonlinear phase-shift compensation [1,2] and in-line phase conjugation [4] can reduce soliton phase jitter. In-line filtering was also shown to reduce phase jitter [5][6][7][8] (including Butterworth filters [6]) through the damping of amplifiers noise which results in a linear increase of the phase jitter with distance. Butterworth filters are suggested to replace conventional Gaussian filters in control phase jitter [6] because Butterworth filters have larger damping coefficient than that of Gaussian filters.…”

Control of soliton interactions by use of super-Gaussian sliding-frequency filters

“…This allows smaller timing jitter without sacrificing the signal-to-noise ratio (SNR) [15,16] . Recently, it has also shown that super-Gaussian filters can reduce timing jitter and phase jitter more effectively than the Gaussian filters do [16,17] . Super-Gaussian filters can be implemented with holographic fiber gratings [18] and their design is performed by means of the inverse scattering technique [19,20] .…”