Suppression of Intrachannel Nonlinear Effects With Alternate-Polarization Formats

Demonstration of an 8-dimensional modulation format with reduced inter-channel nonlinearities in a polarization multiplexed coherent system

“…At present, the complexity of such solutions limits the commercial applicability of this approach. Current implementable solutions for mitigating NL interference include the use of linear pre-dispersion applied at the transmitter [6,7] and rapid alternation of the transmit polarization state [8] to minimize crosspolarization modulation (XPolM). The linear (and NL) performance of a channel is also strongly influenced by the constellation design.…”

All-optical wavelength conversion for polarization shift keying signal based on four-wave mixing in a semiconductor optical amplifier

“…For example, an alternate-polarized return-to-zero ͑APRZ͒ signal with orthogonal polarization between adjacent bits shows significant improvement in long transmission quality compared with nonreturn-to-zero ͑NRZ͒ and RZ formats. 5,6 Wavelength conversion techniques are very important for the implementation of future all-optical networks. The study of wavelength conversion for polarization modulated signals is expected, so that new modulation formats, such as PolSK and APRZ, can be applied in future high-capacity all-optical networks.…”

Mitigation of Nonlinear and PMD Impairments by Bit-Synchronous Polarization Scrambling

“…A different type of fast polarization scrambling (operating at half the data rate) involves the periodic alternation of the state of polarization of subsequent bits, or alternate-polarization ON-OFF keying (OOK) format. Such input polarization rotation reduces the nonlinear interaction among subsequent marks whenever a return-to-zero (RZ) modulation format is used [17], [18].…”