Evolution of the gain extinction ratio in dual-pump phase sensitive amplification

Abstract

We have experimentally achieved a gain extinction ratio (GER) of 30 dB at 21.75 dBm pump power in a dual-pump phase sensitive amplifier based on highly nonlinear fiber, which is more efficient than what we predict with the conventional three-wave model. We point out that high-order sidebands play a key role. Then we scrutinize the trajectories of the output signal vector in the complex plane with increasing nonlinear phase shift and understand the roll-over behavior of GER versus pump power curve. We found that the phase "flip" of the output signal occurs around the largest GER. Adjusting design parameters, we show how to improve GER.

Phase Sensitive Parametric Interactions in a <inline-formula> <tex-math notation="LaTeX"> $Ga_{0.5}In_{0.5}P$</tex-math> </inline-formula> Photonic Crystal Waveguide

“…Finally, as can be seen in Fig. 3(b), the additional idler waves also contribute to the asymmetry and reduce the the overall interaction between the two pumps and the signal [25]. The simulations show a slight asymmetry, yet some of the parasitic effects are not considered and reconstruction of the experimental results is imperfect.…”

Photonic Quantum Noise Reduction with Low-Pump Parametric Amplifiers for Photonic Integrated Circuits

“…As the same number of stimulated photons is gained, or lost, by both the signal and the idler waves through stimulated emission [14][15][16][17], the rate of power change should incorporate the product of all the optical powers taking part in the parametric conversion, that is, dP s,i /dz = γ (2m+1) P p m (P s P i ) 1/2 sinθ(z)…”

“…The critical role of the parametrically engendered phases has been demonstrated experimentally [15][16][17]. A physically meaningful phase-sensitive (PS) gain coefficient was identified in [14], (Equations (24)- (29)) along with its spectral bandwidth.…”

Pump-degenerate phase-sensitive amplification in chalcogenide waveguides

“…3) are 20 dB lower than the maximum amplified signal. The effects of these additional FWM products on the signal/idler and pump waves are therefore negligible [29]. Also, because the parasitic FWM depletes energy from the pump power in the signal-degenerate case, the pump-degenerate PSA achieves a maximum gain of 16.2 dB compared to 8 dB in the signal-degenerate PSA at the same power level.…”