Characteristics of all-optical ultrafast gate switches using cascade of second-harmonic generation and difference frequency mixing in quasi-phase-matched lithium niobate waveguides

160-Gb/s all-optical OTDM demultiplexing and pulse reshaping by using cascaded wavelength conversion in PPLN waveguides

“…It is also indicated that with the same average power for the two inputs of the PPLN waveguide, the conversion efficiency is higher in Scheme I than in Scheme II; while Scheme II has better reduction of noise in the converted wave. Moreover, the simulation results in this work agree well with the reported experimental data [5,7], and further supplement the previous theoretical analyses [8,9]. In conclusion, ultra-fast all-optical OTDM demultiplexing and simultaneous pulse reshaping can be realized by using cascaded wavelength conversion in QPM PPLN waveguides.…”

“…As an important nonlinear interaction, the cascaded second-harmonic generation (SHG) and difference frequency generation (DFG) wavelength conversion in quasi-phase-matched (QPM) periodically poled lithium niobate (PPLN) waveguide has many advantages, such as ultra-fast response, low noise, high efficiency, broad band width, high dynamic range, and integration compatibility [2][3][4]. Recently, by using the SHG-DFG-based wavelength conversion technique, all-optical demultiplexing from 40 Gb/s to 10 Gb/s [5], from 100 Gb/s to 10 Gb/s [6] and from 160 Gb/s to 20 Gb/s [7] has been experimentally demonstrated, and some numerical analyses have also been reported [8,9]. In the OTDM demultiplexing based on the SHG-DFG-based wavelength conversion, two input pulse trains, i.e., multiplexed signal and demultiplexing clock, are injected into a QPM PPLN waveguide, and taken as the pump and control waves.…”

All-optical decision gate circuits using cascaded periodically poled lithium niobate devices

“…The input signal and clock pulses are assumed to be chirp-free Gaussian pulses having the same pulse width parameter T 0 of 1 ps. The input signal pulse precedes the input clock pulse by 2 ps for improving the wavelength conversion efficiency [10]. We numerically calculate the coupled-mode equations for all frequency components contained in each optical pulse [10].…”

“…On the other hand, an all-optical gate switch using a periodically poled lithium niobate (PPLN) has been reported recently [10]. In the PPLN switch, when the center wavelength of the signal pulses is set to the quasi-phase matching (QPM) wavelength, the signal pulses can switch a clock pulse train through the cascaded second-order nonlinear effect.…”

Integrated frequency shifter in periodically poled lithium tantalate waveguide

“…Periodic poling for quasi-phase-matching and channels for operation in the near-infrared C-band were obtained in congruent lithium tantalate, demonstrating for the first time both wave confinement and two-stage parametric conversion in such waveguides.Introduction: All-optical wavelength conversion (AOWC) is one of the key technologies for signal processing in high bit-rate and large-capacity optical networks [1][2][3][4][5]. The implementation of AOWC could indeed enable dynamic wavelength-reusage and fault-protection strategies.…”