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Study of Chromatic Dispersion Impacts on Kramers-Kronig and SSBI Iterative Cancellation Receiver
摘要： Field recovery of single sideband (SSB) signals with direct detection has recently been investigated for short-reach communications. One of the cruxes of such direct-detected transmission system is signal-signal beat interference (SSBI) mitigation without sacrificing spectral efficiency. Among various digital signal processing schemes, Kramers-Kronig (KK) algorithm has attracted considerable interest recently due to its effective mitigation of SSBI, and the phase of signals can be recovered using intensity information. As such, chromatic dispersion (CD) can be digitally compensated. Beside KK algorithm, SSBI can also be sufficiently mitigated iteratively. In this paper, we carry out an 80-Gb/s 160-km transmission experiment to investigate chromatic dispersion impacts on both KK and SSBI iterative cancellation (IC) receiver. It is shown that for KK receiver, optimal carrier-to-signal power ratio (CSPR) values increase with transmission distance. This is because that CD induced peak-to-average power ratio (PAPR) increase violates minimum phase condition, and thus the field cannot be reconstructed accurately, leading to degradation of transmission performance. Consequently, OSNR sensitivity for KK receiver is dependent on CD. In contrast, IC receiver has no limitation of minimum phase condition, and thus exhibits high robustness against CD regardless of CSPRs. Besides, experimental results show that after 160-km transmission at the BER threshold of 10-3, the required OSNR for IC receiver is 1.9 dB lower than that of KK receiver.
关键词： direct detection,Kramers-Kronig receiver,virtual single sideband signal,signal-signal beat interference,Chromatic dispersion
更新于2025-09-23 15:22:29
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[IEEE 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Huangshan, China (2019.8.5-2019.8.8)] 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Joint optimization of amplitude shifting and clipping for KK receiver
摘要： To minimize the devastating zero-by noise effect of KK receiver, amplitude shifting and clipping are coordinated with optimal configuration. And it improves the CSPR tolerance. To optimize the bit error rate (BER) performance, we systematically investigate the relevant key parameters of KK relation implementation namely the optimal combination of shifting and clipping factors.
关键词： Kramers-Kronig receiver,amplitude shifting,amplitude clipping
更新于2025-09-16 10:30:52
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400-Gb/s Single-Photodiode Polarization-Agnostic Kramers-Kronig Reception of Distributedly Aggregated Superchannel
摘要： In its most simple implementation, the Kramers-Kronig (KK) scheme allows the reception of complex modulation formats with a single photodiode. Thereby, in analogy to a heterodyne receiver, an additional continuous wave signal is used which allows under certain conditions the distortion-free reconstruction of the data signal. We present experimental investigations on a novel Kramers-Kronig scheme based on inherently carrier generation at the receiver. We use a distributed superchannel aggregation scheme to demonstrate ultra-wideband single-photodiode reception of a 3×33-GBd single-polarization 32QAM superchannel with this scheme. The impact of polarization rotations is discussed, and we show that variations in data or Kramers-Kronig carrier polarization will only affect the carrier-to-signal power ratio (CSPR), leading to an increase or decrease from the optimum CSPR by about 6 dB. 400-Gb/s net capacity is demonstrated for optimized conditions. In addition, we demonstrate transmission measurements over a 60-km standard single-mode fiber (SSMF) link with a 344-Gb/s net rate superchannel (3×28 GBd sub-carriers) with the novel Kramers-Kronig scheme.
关键词： optical frequency conversion,optical signal processing,Kramers-Kronig receiver,Direct detection,optical fiber communication,sub-carrier modulation
更新于2025-09-09 09:28:46