A new cycle slip compensation technique for ultra high speed coherent optical communications

Castrillon, Mario A.; Morero, Damián A.; Hueda, Mario R.

doi:10.1109/ipcon.2012.6358547

Cited by 7 publications

(6 citation statements)

References 8 publications

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“…In the 30 GBaud transmissions with the photocurrent larger than 0.75mA, the BER of the proposed algorithm with two BPSs was the same with that of the algorithm using a pilot symbol [18]. This was expected because the accuracy of the phase estimation was decided by the second phase estimator.…”

Section: Phase Estimation Using a Pilot Symbolmentioning

confidence: 71%

“…9. Measured BER as a function of UTC-PD power for the conventional method using pilot symbol, the algorithm using pilot symbol and a BPS [18], and the proposed algorithm with two BPSs in (a) 30 GBaud, (b) 20 GBaud transmission.…”

Section: Experimental Results Of Cfo Recoverymentioning

confidence: 99%

“…Using regularly inserted pilot symbols, phase differences between transmitted symbols and received symbols can be obtained [11]. Figure 9 shows the measured BER as a function of photocurrent for a conventional data-aided algorithm with different pilot symbol intervals, of 32, 64, and 128, the algorithm with a data-aided algorithm using a pilot symbol to prevent cyclic slips and a blind estimator [18] and the proposed algorithm with two blind phase estimators. BERs of 30 GBaud and 20 GBaud with two LDs with a linewidth of 100 kHz and 1 MHz are shown in Fig.…”

Section: Phase Estimation Using a Pilot Symbolmentioning

confidence: 99%

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Novel Phase and CFO Estimation DSP for Photonics-Based Sub-Thz Communication

Rha

Moon

Lee

et al. 2022

J. Lightwave Technol.

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Sub-terahertz (THz)-band communication system has drawn much attention as a promising technology to provide future-proof high data rate services. In a photonics-based sub-THz communication system, the generation of THz wave using free running lasers enables us to make a simple, cost effective and frequency tunable implementation. On the other hand, commercially available lasers have relatively broader linewidth and a large carrier frequency offset (CFO).To mitigate the performance degradations due to phase noise and CFO, a carrier recovery digital signal processing (DSP) algorithm is studied for a sub-THz transmission system. We propose a novel phase estimation algorithm to avoid cyclic slips while minimizing phase estimation error to improve BER performance. Our proposed phase recovery DSP algorithm is demonstrated in a 16-quadrature amplitude modulation (QAM) in a 0.3 THz band photonics-based transmission system. Experimental results show that the measured BER are improved from 8.810 -3 to 3.610 -3 in a 120 Gb/s 16-QAM transmission using the proposed algorithm. A wide range of CFO estimation is also supported for a sub-THz wireless transmission system using off-the-shelf lasers. Recovery of a CFO between -5 GHz and 5 GHz was also successfully demonstrated.

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Section: Phase Estimation Using a Pilot Symbolmentioning

confidence: 71%

Section: Experimental Results Of Cfo Recoverymentioning

confidence: 99%

Section: Phase Estimation Using a Pilot Symbolmentioning

confidence: 99%

See 1 more Smart Citation

Novel Phase and CFO Estimation DSP for Photonics-Based Sub-Thz Communication

Rha

Moon

Lee

et al. 2022

J. Lightwave Technol.

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“…Constellations with rotational symmetry, such as QPSK or 16-QAM, suffer from certain catastrophic errors called cycle slips, which happen when the carrier phase rotates by a multiple of 90 degrees [52]. This effect can be mitigated by using differential encoding, but this causes an OSNR penalty in the range of 1dB.…”

Section: ) Fec and Pilot Symbolsmentioning

confidence: 99%

Design Tradeoffs and Challenges in Practical Coherent Optical Transceiver Implementations

Morero¹,

Castrillon

Aguirre³

et al. 2016

J. Lightwave Technol.

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This tutorial discusses the design and ASIC implementation of coherent optical transceivers. Algorithmic and architectural options and tradeoffs between performance and complexity/power dissipation are presented. Particular emphasis is placed on flexible (or reconfigurable) transceivers because of their importance as building blocks of software defined optical networks. The article elaborates on some advanced digital signal processing (DSP) techniques such as iterative decoding, which are likely to be applied in future coherent transceivers based on higher order modulations. Complexity and performance of critical DSP blocks such as the forward error correction decoder and the frequency-domain bulk chromatic dispersion equalizer are analyzed in detail. Other important ASIC implementation aspects including physical design, signal and power integrity, and design for testability, are also discussed.

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“…By keeping the estimated CS rate below , 10 4 -the degradation from the theoretical limit is lower than 0.2 dB in the case of an AWGN channel. By using (11), a fit to the semianalytical result was obtained by setting the expected number e of bit-errors in a single CS event to four in the simulation. Once the CS rate is characterized, the performance of PC-DP-BPSK with CSC can be predicted by this approach.…”

Section: Osnr Dependencementioning

confidence: 99%