FWM Implementation and Analysis Using MATLAB - Optical Signal Processing by Silicon Photonics - page 114

• Waveguide length
• Waveguide linear refractive index
• Waveguide nonlinear refractive index.
Other Tuning Parameters
• Linear loss coeficient
• Nonlinear loss coeficient
• Number of free carriers
• Two photon absorption coeficient
• Free carriers absorption coeficient
• Stokes power
• Conjugate power
• Phase mismatch coeficient
• Linear noise
• Nonlinear noise
• Total noise
• Energy of photon
• Net gain
• Net loss
• Noise igure.
Considering the above-mentioned key parameters, the investigated research-results
obtained by using simulation are discussed and demonstrated below. Mostly the
pump power in presence of different free carriers' life time is simulated. The dis-
persion values along with wavelengths and wavelength detuning (between pump
and signals) impact on conversion efficiency is investigated. The impact of wave-
guide length, pump pulse-width, and repetition rate are presented in particular in
this section.
To analyze the performance of frequency, the impact of operating wavelengths
and pump pulse parameters are investigated numerically. The silicon waveguide
under discussion has been considered to be 1 cm long with 0.1 µ M 2 effective area.
9.2 Impact of Pump Power
The different pump powers influence the phase matching conditions according to
Eqs. ( 8.8 ) and ( 8.10 ). Figures 9.1 and 9.2 show the influence of the pump power
on the CE. It is obvious that the CE increases with the increase of pump power first
and then gradually saturates or even decreases with the further increase in the pump
power. This is due to the effective carrier lifetime and to the losses, especially the
FCA loss, which causes the effective pump power to reduce the FWM process.