Effect of Intrapulse Stimulated Raman-Scattering on Soliton-Effect Pulse-Compression in Optical Fibers (original) (raw)
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Characterization and compression of dissipative-soliton-resonance pulses in fiber lasers
Scientific reports, 2016
We report numerical and experimental studies of dissipative-soliton-resonance (DSR) in a fiber laser with a nonlinear optical loop mirror. The DSR pulse presents temporally a flat-top profile and a clamped peak power. Its spectrum has a rectangle profile with characteristic steep edges. It shows a unique behavior as pulse energy increases: The rectangle part of the spectrum is unchanged while the newly emerging spectrum sits on the center part and forms a peak. Experimental observations match well with the numerical results. Moreover, the detailed evolution of the DSR pulse compression is both numerically and experimentally demonstrated for the first time. An experimentally obtained DSR pulse of 63 ps duration is compressed down to 760 fs, with low-intensity pedestals using a grating pair. Before being compressed to its narrowest width, the pulse firstly evolves into a cat-ear profile, and the corresponding autocorrelation trace shows a crown shape, which distinguishes itself from p...
Journal of The Optical Society of America B-optical Physics, 2006
We present a numerical study of the wave breakup and soliton formation in a standard single-mode fiber pumped by variable pulse lengths in the range from 20 to 400 ps in the presence of noise. The average power and the standard deviation of the trailing soliton were calculated. We calculated also the average distance at which the soliton time delay reaches 1.5 times the pulse width. We found that for pulses longer than 100 ps the breakup starts from the amplification of the noisy modulation of the amplitude by the modulation instability mechanism even for very low noise power, while for pulses shorter than 20 ps the breakup starts from the pulse collapse. For intermediate durations, wave breakup starts from the pulse collapse at low noise power, while for higher noise power, modulation instability prevails.
Journal of Electromagnetic Analysis and Applications, 2012
Based on the nonlinearity of the nonlinear optical coupler (NOC) and the amplifying capacity of the backward Raman fiber amplifier (PBRFA), two new optical systems to compress the optical pulse (Optical Pulse Self-Compressor: OPSC) are proposed. Using the expressions describing relationship between input and output intensities from ports of the NOC and the derived expression describing the amplification of the PBRFA, the compressing process of the optical pulse propagating through the OPSC is simulated. The results show that the peak of the optical pulse will be enhanced and the duration of the optical pulse will be reduced significantly. Consequently, the shape of input pulse is completely compressed with the certain efficiency. It means the optical pulse is self-compressed without the external pump pulse by proposing the OPSC.
Sub-two-cycle soliton-effect pulse compression at 800 nm in photonic crystal fibers
Journal of the Optical Society of America B, 2007
The possibility of soliton self-compression of ultrashort laser pulses down to the few-cycle regime in photonic crystal fibers is numerically investigated. We show that efficient sub-two-cycle temporal compression of nanojoule-level 800 nm pulses can be achieved by employing short (typically 5-mmlong) commercially available photonic crystal fibers and pulse durations of around 100 fs, regardless of initial linear chirp, and without the need of additional dispersion compensation techniques. We envisage applications in a new generation of compact and efficient sub-two cycle laser pulse sources. * Electronic address: marco.tognetti@fc.up.pt
Optics Communications, 1988
We investigate the influence of group velocity dispersion on modelocked Nd:YAG laser pulses depleted by multiple order stimulated Raman scattering in a single mode fiber. Measurements of the pump pulse self-phase-modulation spectrum and compressibility in long fibers indicate the formation of a linear chirp over most of the pump pulse spectrum. In the presence of third Stokes generation, stimulated Raman scattering and group velocity dispersion combine to clamp the pump pulse energy and produce ultrastable compressed pulses as short as 550 fs.
Optics Express, 2013
longer cavities (120 m), but needs additional study. The maximum RP energy is also limited because of its sufficient attenuation and generation of higher-order Stokes pulses. The total energy of the DS-RP complex in the experiment and numerical simulation is also saturated at 30 nJ level (see Fig. 6(b)). The DS duration grows linearly with the cavity length, up to ~70 ps at 120 m. The DS has a rectangular shape with high linear chirp, which is confirmed by external compression down to 200-300 fs, depending on the cavity length. The resulting compression factor of >200 seems to be a record value for the pulses generated in fiber lasers. Let us now discuss the results obtained in this work in a more general way, with their possible extensions. We found that the DS with variable chirp and the energy defined by the fiber core diameter (~25 nJ at a wavelength of 1 μm for single-mode PM fiber with d = 5.5 μ) can be generated even in the presence of strong SRS. The pulse energy realized in our experiment is higher than that obtained in other all-fiber schemes in the absence of SRS [10, 18, 19]. Note that the chirped RP has partial coherence and can therefore be compressed by only a factor of 4. To push the maximum DS energy, one can try large-mode area fibers [13-15]. The SRS in this case will be suppressed owing to a lower coefficient g R. The main drawback of this approach is the loss of all-fiber concept that has many advantages over hybrid schemes, as we pointed out above. We have demonstrated that the stable DS pulses can be generated in a fiber oscillator in spite of strong SRS, in contrast to conclusions of [19]. The generated noisy RP does not destroy the DS and can even form a stable bound compleх with it. In this complex the DS provides amplification for the RP, whereas the RP stabilizes the DS energy acting as a temporal and spectral filter for DS. Intuitively, because the Raman process is incoherent and acts in our case as an additional energy loss channel. The DS stability can't be affected by the RP, at least if we compensate the extra loss by proportional pumping. The pulse energy realized in our experiment is higher than that obtained in other all-fiber schemes in the absence of SRS, though SRS-induced energy conversion defines an upper limit for the DS energy and substantially changes the DS energy scalability. We recently found that the RP noise seen in Figs. 1 and 4, can be successfully suppressed by the feedback loop. As a result, a stable chirped dissipative Raman soliton has been demonstrated for the first time. These results will be published soon.
Measuring the Raman time constant (T/sub R/) for soliton pulses in standard single-mode fiber
Journal of Lightwave Technology, 1999
The Raman time constant (T R) used in the generalized nonlinear Schrödinger equation is determined experimentally at 1550 nm based on the Raman self-frequency shift in a standard single-mode fiber. The effective value of the T R as measured is found to be 3.0 fs. Detailed error analysis shows that the uncertainty in the measurement is less than 61.0 fs.
IEEE Journal of Quantum Electronics, 1995
In order to deri¨e closed-form expressions of Green's functions for the¨ector and scalar potentials of a horizontal magnetic dipole in a parallel-plate wa¨eguide filled with a homogeneous dielectric, an impro¨ed complex image method based on the two-le¨el approximation is considered in conjunction with the use of Prony's method. The results for the e¨aluation of the closed-form Green's functions obtained () by the present method two-le¨el approximation are compared with () those obtained by the pre¨ious method one-le¨el approximation. The present method is obser¨ed to gi¨e more accurate results than the pre¨ious method o¨er the wide frequency range as well as the whole spatial range.