Modified Synchronization Scheme for Coherent Optical OFDM Systems

Yusha Huang; Xiaoguang Zhang; Lixia Xi

doi:10.1364/JOCN.5.000584

Journal of Optical Communications and Networking
Vol. 5,
Issue 6,
pp. 584-592
(2013)
•https://doi.org/10.1364/JOCN.5.000584

Modified Synchronization Scheme for Coherent Optical OFDM Systems

Yusha Huang, Xiaoguang Zhang, and Lixia Xi

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Yusha Huang, Xiaoguang Zhang, and Lixia Xi, "Modified Synchronization Scheme for Coherent Optical OFDM Systems," J. Opt. Commun. Netw. 5, 584-592 (2013)

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Abstract

We propose a series of modified methods covering timing and frequency synchronization in the coherent optical orthogonal frequency-division-multiplexing (CO-OFDM) system. The modified timing synchronization method eliminates the ambiguity of Park’s method, and the modified frequency synchronization method employs only one training symbol without any loss of accuracy compared to Schmidl’s method. The proposed synchronization scheme is tested in a $20 Gb / s$ CO-OFDM simulated system, with the result that the modified synchronization scheme gives a more accurate timing estimation and a more economical frequency offset estimation with a wide estimation range in the relatively short transmission distance. Meanwhile, chromatic dispersion compensation added before the synchronization keeps the modified scheme’s performance stable over longer distances and makes better subcarrier recovery with the optical signal-to-noise ratio improved by 3 dB at the bit-error rate of $10^{- 3}$ .

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Modified	Park’s	Minn’s	Schmidl’s
Not robust to CD	Not robust to CD	Robust to CD	Robust to CD
Single-impulse-shaped timing metric	Impulse-shaped timing metric with side lobes	Triangle-shaped timing metric	Platform-shaped timing metric
Stable correct timing	Large timing uncertainty due to the side lobes	Small timing uncertainty due to a shift of the top of triangle	Large timing uncertainty due to the plateau

Modified	Schmidl’s	Morelli’s
Simple form of two identical parts	One for the same form as the above, the other for an arbitrary form	Special design of multiple identical segments to fit the estimation range
One training symbol cost	Two training symbol cost	One training symbol cost
Estimation range $(- N \cdot Δ f / 2, N \cdot Δ f / 2)$	Estimation range $(- N \cdot Δ f / 2, N \cdot Δ f / 2)$	Estimation range $(- L \cdot Δ f / 2, L \cdot Δ f / 2)$
The same performance as Schmidl’s	Normal performance	Comparable performance with Schmidl’s

Modified	$PA + ML - DF$
With CD compensation before synchronization	Without CD compensation
Channel estimation only needs to consider the residual dispersion	Channel estimation has to handle large CD impairments
OSNR requirement is 3 dB lower at the BER of $10^{- 3}$	Normal performance

Modified	Park’s	Minn’s	Schmidl’s
Not robust to CD	Not robust to CD	Robust to CD	Robust to CD
Single-impulse-shaped timing metric	Impulse-shaped timing metric with side lobes	Triangle-shaped timing metric	Platform-shaped timing metric
Stable correct timing	Large timing uncertainty due to the side lobes	Small timing uncertainty due to a shift of the top of triangle	Large timing uncertainty due to the plateau

Modified	Schmidl’s	Morelli’s
Simple form of two identical parts	One for the same form as the above, the other for an arbitrary form	Special design of multiple identical segments to fit the estimation range
One training symbol cost	Two training symbol cost	One training symbol cost
Estimation range $(- N \cdot Δ f / 2, N \cdot Δ f / 2)$	Estimation range $(- N \cdot Δ f / 2, N \cdot Δ f / 2)$	Estimation range $(- L \cdot Δ f / 2, L \cdot Δ f / 2)$
The same performance as Schmidl’s	Normal performance	Comparable performance with Schmidl’s

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Journal of Optical Communications and Networking