## Low Overhead Intra-Symbol Carrier Phase Recovery for Reduced-Guard-Interval CO-OFDM

Journal of Lightwave Technology, Vol. 31, Issue 8, pp. 1158-1169 (2013)

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### Abstract

We propose intra-symbol carrier phase recovery (IS-CPR) for
reduced-guard-interval (RGI) CO-OFDM in order to compensate for the intra-symbol phase
shift (ISPS) between subcarriers that is caused by the dispersion-enhanced phase noise
(DEPN). We begin by proposing a pre-emphasized pilot subcarrier (PEPS) approach to
reduce the pilot subcarrier overhead for the following IS-CPR algorithms. Then, we show
a statistical analysis of the DEPN-induced ISPS between subcarriers within one symbol,
which is related to the accumulated chromatic dispersion (CD). Next, three algorithms
are proposed for IS-CPR including maximum-likelihood (ML) phase estimation, digital
phase-locked loop (DPLL), and feedforward carrier recovery (FFCR) employing either the
*M*th power scheme in case of QPSK modulation or the QPSK partitioning scheme
for the 16-QAM case. The performance and complexity of these algorithms are compared.
Through simulations, we show that in comparison to conventional common phase error (CPE)
compensation, IS-CPR significantly improves the linewidth tolerance at 1 dB
signal-to-noise ratio (SNR) penalty for a bit error rate (BER) = 10^{-3} from
300 kHz to 2 MHz for 112 Gb/s systems (28 Gbaud QPSK) at 3200 km transmission distance,
and from 70 kHz to 550 kHz for 448 Gb/s (56 Gbaud 16-QAM) systems at 1600 km
transmission distance.

© 2013 IEEE

**Citation**

Qunbi Zhuge, Mohamed H. Morsy-Osman, and David V. Plant, "Low Overhead Intra-Symbol Carrier Phase Recovery for Reduced-Guard-Interval
CO-OFDM," J. Lightwave Technol. **31**, 1158-1169 (2013)

http://www.opticsinfobase.org/jlt/abstract.cfm?URI=jlt-31-8-1158

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