Multicarrier Approaches for High-baudrate Optical-Fiber Transmission Systems with a Single Coherent Receiver

Abstract : In this paper, we show the remarkable timing error (TE) and residual chromatic dispersion (CD) tolerance improvements of the filter bank multicarrier (FBMC) over orthogonal frequency division multiplexing (OFDM) for high-baudrate spectral slicing transmitter and single coherent receiver transmissions. For a 512 Gb/s 16 quadrature amplitude modulated (16QAM) spectrum slicing system at 1600 km of fiber transmission, the FBMC-based system reduces TE and residual CD penalties by more than 1.5 dB and 3 dB, in comparison to the OFDM-based system, respectively.

 EXISTING SYSTEM :

 Multi carrier modulation formats, such as orthogonal frequency division multiplexing (OFDM), have been considered as potential techniques for the application of high speed, long-haul, and multi-wavelength optical networks due to the capability of inter-symbol interference (ISI) mitigation using simple digital signal processing (DSP) techniques

 DISADVANTAGE :

 Delay lines (DLs) were required to keep the timing mismatch below 1 ps for the Nyquist-pulse shaping. Such timing-mismatch requirement is very challenging for practical implementation and thus, alternative modulation formats with higher tolerance to timing mismatch among optical paths are highly desirable for high baud rate super channel transmissions

 PROPOSED SYSTEM :

 we have implemented the multicarrier-based 128 Gbaud 16QAM spectrum slicing systems for the long-haul transmission distance. Remarkable timing error (TE) and residual chromatic dispersion (CD) tolerance improvements of the filter bank multicarrier (FBMC) over orthogonal frequency division multiplexing (OFDM) for such system were revealed by numerical simulations. FBMC, therefore, would be a very potential candidate for spectral slice engineering applications in the future.

 ADVANTAGE :

 • The FBMC SS system was also more robust to the residual CD than OFDMs by 3 dB and 4 dB at 1% and 3% of the residual CD, respectively. • This comes from the fact that the FBMC PFs impulse response is four times longer than the OFDMs.

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