Tunable four-wave mixing in low-mode-number optical fibers

Partially degenerate four-wave mixing for different pump wavelengths in step-index optical silica fibers with low mode numbers is considered. The frequency shifts that correspond to the phase match and the overlap integrals are calculated for a tunable pump. It is shown that when the interacting waves propagate in some combinations of the modes LP(01) and LP(11), four-wave mixing is possible for tunable pump wavelengths in the region from 0.4 to 0.9 µm, far from the minimum of the material dispersion.

High-efficiency single-pass solitonlike compression of Raman radiation in an optical fiber around 1.4 microm

Highly efficient conversion (as great as 60%) into the broad first Stokes Raman band around 1.4 microm the 90-psec pump pulses from a cw mode-locked Nd:YAG laser at 1.32 microm has permitted, through a solitonlike compression mechanism in a single span of standard (lambda(0) = 1.3 microm) single-mode optical fiber, the generation of highly stable pulses of ~100 fsec, with average powers of ~30 mW in the solitary waves, which depend on fiber length and pump power.

Parametric interaction of a modulated wave in a single-mode fiber

Parametric interaction in a single-mode fiber between a carrier and its two sidebands was observed. This interaction leads to gain or loss in the two sidebands depending on the relative phase between them and is approximately linearly dependent on the carrier power. A maximum gain of 1.4 was observed at a carrier power of 11 mW.

Single-pass mode-locked or Q-switched pump operation of D2 gas-in-glass fiber Raman lasers operating at 1.56-microm wavelength

Single-pass operation of a D(2) gas-in-glass fiber Raman laser operating at 1.56-microm wavelength, pumped by a Nd: YAG laser operating either Q-switched or mode-locked has been demonstrated. The group velocities in the single-mode host fiber at the pump wavelength (1.06 microm) and the Raman-shifted wavelength (1.56 microm) were matched, thereby providing long interaction lengths and concomitant efficient conversion of pump light to 1.56-microm radiation.

Continuously tunable multiple-order stimulated four-photon mixing in a multimode silica fiber

Stimulated four-photon mixing (SFPM) has been observed up to four orders in a 300-m-long, low-loss, large-core multimode silica fiber pumped by a dual-frequency dye laser. The phase-matching condition for SFPM was uncritically achieved in the multimode fiber, so that, by varying the frequency separation of the two laser lines, it was possible to tune continuously an intense line generated by SFPM under the Raman-gain curve in the range of 350 to 495 cm(-1).