Interferometric analog-to-digital conversion scheme

Integratable all-optical spectral quantization scheme based on chalcogenide–silicon slot waveguide

“…As the key process of AOADC, all-optical quantization techniques have attracted great attention, and lots of smart schemes have already been proposed, e.g. phase-shifted quantizations using electro-optic modulators and interference [5][6][7], multi-period transfer functions and spectral quantizations using optical nonlinear effects [8][9][10][11]. Compared with other schemes, the nonlinear effects-based schemes are competitive due to their ultra-fast response of femtosecond scale, passive operation, and large bandwidth [8][9][10][11].…”

An SOI-based 1550-nm 4×4 multimode interference coupler used for OADC

“…To break through these bottlenecks, ADC utilizing photonic technologies for sampling and quantization has became a research focus as it can realize high sampling rate and high resolution at the same time. Several schemes of OADC have been proposed in recent years [2][3][4][5][6][7][8], which can be divided into two categories, phaseshifted (PS) schemes [2][3][4][5][6][7] and frequency-shifted (FS) schemes [8]. The PS schemes are based on the principle that using the phase shift from different channels to quantify, while the FS schemes are using nonlinear effect to shift wavelength to different channels for quantization.…”

Proposal for an all optical analog-to-digital converter based on modal birefringence in a polarization maintaining fiber

“…1 So far, many different schemes of all-optical ADC have been developed, in which the interferometric ADC has been widely used due to its simple structure and high speed, such as Taylor scheme, 2,3 nonlinear optical loop mirror (NOLM), 4,5 and phase shifted optical quantization (PSOQ). [6][7][8][9][10] The advantage of the PSOQ is its simple structure: only one phase modulator is needed. No requirement for the half-wave voltage of the modulator and no nonlinear effects are utilized, which makes the scheme more stable and reduced power consumption.…”