Novel Equalizer Architecture for Hitless Rate Switching in Energy-Efficient Optical Systems

Hitless Rate Switching for Dynamically Reconfigurable Optical Systems

“…(for practical systems k 2), the effective transmission rate is reduced by N. In this way, system synchronization is maintained during rate switching, requiring only software-implemented changes (transmitter-receiver autonegotiation, separate framing and mapping procedures, etc.) [6]. While in NRZ systems symbol repetition implies bandwidth compression, the same does not happen with RZ and Nyquist pulses.…”

“…Fig. 1(a), reproduced here from [6] for convenience, shows the equalizer architecture used for symbol-repetition-based rate switching. Without loss of generality, suppose the system nominal rate is 100 Gb/s, operating at 28 GBd [to include 7% forward error correction (FEC) overhead], using PM-QPSK modulation.…”

“…In [6] we proposed and experimentally validated a symbol-repetition-based equalizer architecture for hitless rate switching in a 100 G polarization-multiplexed quadrature phase-shift keying (PM-QPSK) system with non-return-to-zero (NRZ) pulses. The proposed technique for hitless rate switching reduces DSP-associated power consumption when traffic load is considerably lower than the system nominal transmission rate (e.g., with IP traffic during night-time [2], [7]).…”

Redes ópticas de longa distância com transceptores de taxa de código variável

“…Ademais, a mudança da taxa de símbolo sem interrupção ou perda de dados na transmissão aindaé uma tarefa desafiadora [63,19].…”