Duration-tunable 100-GHz sub-picosecond soliton train generation through adiabatic Raman amplification in conjunction with soliton reshaping

Wavelength and Duration-Tunable 10-GHz 1.3-ps Pulse Source Using Dispersion Decreasing Fiber-Based Distributed Raman Amplification

“…High-quality pulses with a low-pedestal level less than 20 dB and durations as short as 1 ps were obtained over the full wavelength range tested. Note that less than 470 mW of pump power was required at all wavelengths as opposed to previous pure DRA compression schemes [5]- [8] which have required 1 W of power. The reason that the temporal pulsewidth became shorter at a shorter wavelength is due to the effect of third-order dispersion of our DDF which increases the ratio of input to output dispersion and thereby increases the contribution of the dispersive effects to the compression process.…”

“…Compression factors of 10-20 are, thus, required. A variety of adiabatic pulse compression techniques capable of these levels of compression factor have been demonstrated including those based on dispersion decreasing fibers (DDFs) [2], comb-like dispersion profiled fibers (CDPFs) [3], step-like dispersion profiled fibers [4] distributed Raman amplifiers (DRAs) using uniform fibers [5]- [7], and CDPF followed by DRA [8]. In addition, a chirped soliton compression technique using DRA combined with linear compression after an initial stage of phase modulation has also been demonstrated [9].…”

Wavelength tunable 10-GHz 3-ps pulse source using a dispersion decreasing fiber-based nonlinear optical loop mirror

“…The development of effective pulse compression techniques capable of providing high-quality pulse output (often from a chirped pulse input) is thus an important issue and has received much research interest over recent years. Adiabatic soliton pulse compression has long been considered a promising and simple technology for the generation of high-quality short-duration pulse trains [4]. A range of adiabatic pulse compression techniques have been experimentally demonstrated and these techniques were based on either dispersion profiled fibers (dispersion decreasing fiber, comb-like dispersion profiled fiber, and step-like dispersion profiled fiber) [5]- [7] or uniform fibers with distributed Raman amplification [4], [8].…”

“…Adiabatic soliton pulse compression has long been considered a promising and simple technology for the generation of high-quality short-duration pulse trains [4]. A range of adiabatic pulse compression techniques have been experimentally demonstrated and these techniques were based on either dispersion profiled fibers (dispersion decreasing fiber, comb-like dispersion profiled fiber, and step-like dispersion profiled fiber) [5]- [7] or uniform fibers with distributed Raman amplification [4], [8]. Although this technology provides a powerful approach to generate soliton-like short duration pulses, small departures from the required adiabatic condition along the fiber length due to either nonoptimized dispersion variations along dispersion profiled fiber [9], or excessive Raman gain variations along each soliton period of distributed Raman amplifier compressors [10], lead to the growth of broad low-level pulse pedestals, which are detrimental for ultrahigh-speed OTDM systems application.…”