Reductions of peak-to-average power ratio and optical beat interference in cost-effective OFDMA-PONs

Tsokanos, Athanasios; Zardas, G.; Kavatzikidis, A.; Diamantopoulos, Nikolaos-Panteleimon; Aldaya, Ivan; Tomkos, Ioannis

doi:10.1007/s11107-013-0405-3

Cited by 7 publications

(3 citation statements)

References 14 publications

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“…The optical signals from the ONUs are combined in a 3dB passive optical coupler, representing the remote node of the PON, before the optically combined signal is launched into a 26km SSMF. Both ONUs operate at a nominal wavelength of 1550nm, however a wavelength spacing of 0.3nm is employed to avoid the direct-detection (DD)-induced optical beat interference (OBI) effect [16], in practice wavelength control can be achieved by laser thermal detuning [17] or alternative OBI mitigation methods [18][19] may be employed after suitable modifications. For experiments involving a PTP configuration, ONU1 and the 3dB optical coupler are omitted so that ONU2 connects directly to the 26km SSMF link.…”

Section: B Experimental System Setupmentioning

confidence: 99%

Experimental Demonstration of a Real-Time Digital Filter Multiple Access PON With Low Complexity DSP-Based Interference Cancellation

Al-Rawachy

Giddings

Tang

2019

J. Lightwave Technol.

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A 4-channel, upstream, digital filter multiple access (DFMA) passive optical network (PON) is experimentally demonstrated for the first time in a 26km SMF IMDD system employing real-time ONUs and OLT, which are dynamically reconfigurable in terms of channel spectral allocation and signal modulation parameters. To combat physical channel frequency response-induced cross channel interference (CCI) between spectrally-overlaid orthogonal channels, a real-time, reconfigurable CCI cancellation (CCIC) function implemented in the OLT receiver DSP, is demonstrated to significantly improve the DFMA PON performance and robustness in terms of; significant reductions in total channel BERs and individual subcarrier BERs, substantial increases in channel capacities, considerably reduced sensitivity to ONU synchronisation and excellent transparency to the interfering channel's signal modulation format. The trade-off between the complexity of the CCIC function's filter, in terms of tap count (multiplier elements) and the DFMA PONs performance is optimised to determine the optimum trade-off. It is shown that the CCIC filter only requires as few as 42 taps to achieve excellent CCIC performance. We also fully analyse the DSP complexity of the transmit and receive DFMA filters and the CCIC filters for varying DFMA channel counts and varying ratios of AD/DA converter sample rate to digital logic clock rate (parallelisation factor). It is shown that DFMA filter complexity is independent of channel count and furthermore that for channel counts ≥4 the CCIC filter only needs to process ~10 interference-inducing samples per wanted signal sample, resulting in only ~10 multipliers per parallel filter in the CCIC filter. We have therefore successfully demonstrated an ultra-low complexity, real-time CCIC function, which considerably enhances the performance and robustness of DFMA PONs.

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Section: B Experimental System Setupmentioning

confidence: 99%

Experimental Demonstration of a Real-Time Digital Filter Multiple Access PON With Low Complexity DSP-Based Interference Cancellation

Al-Rawachy

Giddings

Tang

2019

J. Lightwave Technol.

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“…OFDM-PON has been researched as a promising candidate for NG-PON2, due to its benefits such as strong dispersion tolerance, high spectral efficiency, flexible resource allocation and potentially low cost [1][2][3][4]. In a typical PON system, the traffic is transmitted from a user to others via OLT, and suffered from inevitable O-E-O conversion with electrical processes.…”

Section: Introductionmentioning

confidence: 99%

Low Density Parity Check Coding in OFDM-PON Systems

Zhang¹,

Xiao²,

Zhao³

et al. 2016

Proceedings of the 2016 International Conference on Communications, Information Management and Network Security

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Abstract-To meet the demands of different high bandwidth service, OFDM-PON has been considered as one of the candidates for NG-PON2. In this paper, downstream transmission performance based on LDPC-OFDM coding PON system is studied. The simulation results show that employing the LDPC-OFDM coding in PON system can achieve 10 Gb/s downstream transmission. The transmission performance of the LDPC-OFDM system is improved 4.2 dB than uncoded system at the BER of 10 -4 . When the SNR is greater than 2. 6 dB, the Gallager method has better BER performance than the Mackay and BIBD construction schemes, and when the SNR is greater than 4. 6 dB, LLR-BP and the improved decoding algorithm enables to improve system performance. Keywords-low-density parity-check (LDPC); passive optical network (PON); orthogonal frequency division multiplexing (OFDM)

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“…Once the phase of all the subcarriers is the same,there will be a high peak amplitude; and this can introduce a very large However, the basic OFDM signal is of high peak to average power ration (PAPR), as the individual subcarrier signals add up coherently to produce high peaks in the time domain. The high PAPR requires optical componets with a wide linear range to accommodate for the signal variations and deteriorate the transmission performance of the OFDM signal [5][6][7][8][9][10][11]. In addition, scientific analysis has shown that four-wave mixing (FWM) is closely related to an instantaneous peak power.…”

Section: Introductionmentioning

confidence: 99%

Joint PAPR Reduction Scheme in OFDM-PON Systems

Zhang¹,

Zhao²,

Yang³

2016

Proceedings of the 2016 International Conference on Communications, Information Management and Network Security

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Abstract-To meet the demands of different high bandwidth service, optical orthogonal frequency-division multiple accessbased passive optical network (OFDM-PON) has been considered as one of the candidate for NG-PON2. In this paper, a joint peakto-average power ration (PAPR) reduction scheme in OFDM-PON system is proposed. The simulation results show that the system PAPR is greatly improved comparing with other methods. The required OSNR of the improved system decreases under the same BER, and the system performance is greatly improved.Keywords-peak-to-average power ration (PAPR); passive optical network (PON); orthogonal frequency division multiplexing (OFDM); daptive predistortion

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Reductions of peak-to-average power ratio and optical beat interference in cost-effective OFDMA-PONs

Cited by 7 publications

References 14 publications

Experimental Demonstration of a Real-Time Digital Filter Multiple Access PON With Low Complexity DSP-Based Interference Cancellation

Experimental Demonstration of a Real-Time Digital Filter Multiple Access PON With Low Complexity DSP-Based Interference Cancellation

Low Density Parity Check Coding in OFDM-PON Systems

Joint PAPR Reduction Scheme in OFDM-PON Systems

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