Self-Pumping Wavelength Conversion for DPSK Signals and DQPSK Generation Through Four-Wave Mixing in Highly Nonlinear Optical Fiber

All-Optical Amplitude Multiplexing Through Fiber Parametric Interaction Between Binary Signals

“…For example, in (Zhou et al, 2006) OAM-4F was adapted to merge two differential phase-shift keying signals into a single differential quadrature phase-shift keying one. Finally, it should be noted that the techniques discussed here could, in principle, be extended to any other nonlinear material that supports FWM and PA, such as semiconductor optical amplifiers and silicon chips.…”

Heterodyne mixing and polarization diversity techniques in radio over fiber system with high sensitivity and dispersion tolerance

“…In [1], four-wave mixing (FWM) effect in the high nonlinearity fiber is utilized to generate optical DPSK signal. Several schemes have been proposed to distribute optically generated amplitude shift keying (ASK) and phase shift keying (PSK) signals in the wireless environment.…”

“…Two sidebands are separated by an optical interleaver and the phase signal is loaded on one sideband [2]. However, complicated filter is needed to eliminate the unwanted channels in [1,6]. One dual-parallel Mach-Zehnder modulator and one common modulator are used to generate the DPSK signal and sub-carrier multiplexed signal simultaneously in [4].…”

Colorless DQPSK Receiver for Wavelength Routed Packet-Switched Networks

“…If , the relations become and [2]. For the phase, the corresponding relations become and for , and and for .…”

“…, and are the phases of the signal, pump up-converted and down-converted signals, respectively, and a common phase off-set has been omitted for clarity since only the differential phase between adjacent symbols is important due to the delay demodulation [2]. From the phase relations, it is seen that for , apart from an inversion the data information contained in is preserved for the down-converted FWM product, whereas for the data information is preserved (apart from an inversion) for the up-converted FWM product.…”