Title :
Hitless Rate Switching for Dynamically Reconfigurable Optical Systems
Author :
Rozental, Valery N. ; Mello, Darli A. A.
Author_Institution :
Dept. of Electr. Eng., Univ. of Brasilia (UnB), Brasilia, Brazil
Abstract :
We propose a set of techniques to enable hitless rate switching for reconfigurable optical systems and validate, by computer simulations, their applicability to NRZ, RZ, and Nyquist pulse shapes. The polarization-multiplexed quadrature phase-shift keying (PM-QPSK) and 16 quadrature amplitude modulation (16QAM) modulation formats are investigated. Error transients that appear during lower-to-higher rate switching are avoided by sufficiently long equalizer training periods. The robustness of the proposed scheme to polarization mode dispersion (PMD) and signal phase noise is also demonstrated.
Keywords :
optical noise; optical switches; quadrature amplitude modulation; quadrature phase shift keying; NRZ pulse shapes; Nyquist pulse shapes; RZ pulse shapes; computer simulations; dynamically reconfigurable optical systems; error transients; hitless rate switching; long equalizer training periods; polarization mode dispersion; polarization-multiplexed quadrature phase-shift keying; quadrature amplitude modulation formats; signal phase noise; Adaptive optics; Equalizers; Optical pulse shaping; Optical signal processing; Optical switches; Optical transmitters; Adaptive transponders; Coherent optical communications; Power-efficient transmission; adaptive transponders; power-efficient transmission;
Journal_Title :
Photonics Journal, IEEE
DOI :
10.1109/JPHOT.2015.2419226
