We investigate optical prefiltering for 56Gbaud (224Gbit/s) electrical time-division multiplexed (ETDM) dual polarization (DP) quaternary phase shift keying (QPSK) transmission. Different transmitter-side optical filter shapes are tested and their bandwidths are varied. Comparison of studied filter shapes shows an advantage of a pre-emphasis filter. Subsequently, we perform a fiber transmission of the 56Gbaud DP QPSK signal filtered with the 65GHz pre-emphasis filter to fit the 75GHz transmission grid. Bit error rate (BER) of the signal remains below forward error correction (FEC) limit after 300km of fiber propagation.
- Optical prefiltering
- Optical modulation
- Quaternary phase shift keying
- Coherent detection
- Optical transmission
- Wavelength division multiplexing
Borkowski, R., de Carvalho, L. H. H., Silva, E. P. D., Diniz, J. C. M., Zibar, D., de Oliveira, J. C. R. F., & Tafur Monroy, I. (2014). Experimental evaluation of prefiltering for 56 Gbaud DP-QPSK signal transmission in 75 GHz WDM grid. Optical Fiber Technology, 20(1), 39-43. https://doi.org/10.1016/j.yofte.2013.11.006