Title :
Wide-range frequency offset estimator for DSP-based optical coherent receivers
Author :
Diniz, Júlio César M ; Rosa, Eduardo S. ; Ribeiro, Vitor B. ; Oliveira, Júlio C R F ; Bordonalli, Aldário C.
Author_Institution :
Reconfigurable Opt. Syst. Lab., CPqD Found., Campinas, Brazil
fDate :
Oct. 29 2011-Nov. 1 2011
Abstract :
We propose a hardware-efficient, feed-forward, wide-range frequency offset estimator for DSP-based optical coherent receivers, employed in 112 Gb/s PM-QPSK systems. This estimator is capable to estimate offsets in a range of ±5 GHz, using a simple relationship of signal spectrum. The obtained results show that this estimator is robust to spectrum asymmetry caused by electrical and optical filtering of the signal, even when using return-to-zero signals.
Keywords :
digital signal processing chips; feedforward; frequency estimation; multiplexing; optical modulation; optical receivers; quadrature phase shift keying; DSP-based optical coherent receivers; PM-QPSK systems; bit rate 112 Gbit/s; electrical filtering; optical filtering; return-to-zero signals; signal spectrum; spectrum asymmetry; wide-range frequency offset estimator; Filtering; Frequency estimation; Optical fibers; Optical filters; Optical polarization; Optical receivers; Coherent Communications; DSP; Frequency Offset Estimation; Phase Modulation; Polarization Multiplexing;
Conference_Titel :
Microwave & Optoelectronics Conference (IMOC), 2011 SBMO/IEEE MTT-S International
Conference_Location :
Natal
Print_ISBN :
978-1-4577-1662-1
DOI :
10.1109/IMOC.2011.6169347
