Quaternary optical transmission system combining phase and polarization-shift keying

Abstract

Abstract-A new optical transmission scheme which combines polarization-shift keying and differential phase-shift keying on the same optical carrier is proposed. Simulations carried out show a considerable tolerance toward different physical impairments, such as polarization-mode dispersion, nonlinear effects, and chromatic dispersion. When compared to other multilevel modulation formats, it shows the advantage of reusing the carrier power, thus, sensitivity is improved.

3-bit/symbol optical data format based on simultaneous DRZ, DPSK and PolSK orthogonal modulations

“…At the output of the PM, the DRZ/DPSK signal is launched at 45 o for PolSK modulation. The polarization modulator (PolM) model used here is the same as [6]. It consists of a polarization beam splitter (PBS) and a polarization beam combiner (PBC).…”

Cross-polarization modulation: theory and experiment multiple-wavelength system

“…If the optical powers of the WDM channels are modulated, cross-polarization modulation degrades the degree of polarization of the signal. This can have deleterious effects in many optical systems: in combination with polarization-dependent gain or loss it can cause interchannel crosstalk [4], it can degrade the performance of polarization-mode dispersion (PMD) compensators [2,3], and in systems employing polarization modulation [5,6] it can cause crosstalk between the channels. Although cross-polarization modulation can seriously degrade signal quality, it can easily be overlooked in system experiments.…”