Raman And Four Photon Mixing Amplification In Single Mode Fibers

Abstract

In this paper, fibers and transmission system designs using nonlinear optical amplification and frequency conversion in single -mode fibers(SMF) are discussed. Optical amplification of signals issued from laser diodes in the first and second optical transmission windows is reported. Raman gains of 40 dB have been obtained for 1.32 µm laser diode light at the rate of 11 dB/W in a 2.5 km long SMF. Parametric amplification of laser diode signals at 1.57 µm in a 30 m long SMF pumped in the low dispersion region at 1.32 µm is presented. Gain values in excess of 30 dB are measured. Up and down frequency conversions using stimulated four -photon mixing experiments are also demonstrated.

Wide-Band Tuning of the Gain Spectra of One-Pump Fiber Optical Parametric Amplifiers

“…If they are tens of nanometers wide, they could be used for making amplifiers in regions such as the S-band or the O-band, using convenient pumps in the C-band. Such narrow gain regions far from the pump were observed in early OPA work in standard single-mode fibers [5], [6], but they were not tuned over wide regions.…”

“…Expressed in wavelength units, this becomes (6) where ; for nm, s m . (The approximately equal sign is used in (6) to indicate that this conversion becomes less accurate as increases.…”

Parametric amplification and wavelength conversion in the 1040–1090 nm band by use of a photonic crystal fiber

“…First attempts have been made in the 1970s in the visible domain by use of birefringent or multimode fibers 3 and later in the 1.3 m window with single-mode fibers ͑SMFs͒. 4 But now, most of FOPAs are being developed in the 1.55 m band to meet the requirements of the telecommunication industry. Despite the number of potential applications in the 1 m band ͑ytterbium and YAG wavelengths͒, 5 however, it is remarkable that no experimental demonstration of fiber-based parametric amplifier operating at 1 m has been done yet.…”

Modulational Instability and Stimulated Raman Scattering in Normally Dispersive Highly Birefringent Fibers

“…In the numerical simulations, we considered the experimental fiber parameters: the group-velocity dispersion was ␤ s 60 ps 2 Figures 8a and 8c show the evolution along the fiber length of the power in the two orthogonal components of the field, for P s 56 W, P s 2 W, and f s 2.5 THz. As can be seen, an initial modulation on both fiber axes.…”

“…Ž .x gain, which reverses the initial power imbalance between the pumps P 0 ) P 0 , 1 2 thus leading to a dominant Stokes wave S on the slow axis. 2 In the experiments, the suppression of the Raman Stokes radiation in a given fiber axis is achieved through the polarization rotation of SRS as follows. First, we Ž .…”