Impact of Modulator Bias on the OSNR Requirement of Direct-Detection Optical OFDM

Leibrich, Jochen; Ali, Abdulamir; Paul, Henning; Rosenkranz, Werner; Kammeyer, Karl‐Dirk

doi:10.1109/lpt.2009.2022174

Cited by 34 publications

(26 citation statements)

References 7 publications

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“…It is obvious from equation (2) that the MZM should be biased in between V bias ≥ V π /2 (quadrature point) and V bias < V π due to sensitivity (received optical power) and nonlinearity (MZM power transfer characteristic) tradeoff. For a fixed V bias = V π /2 (maximum linearity), low σ s results in low sensitivity, while high σ s results in signal distortion due to MZM nonlinearity [2], [6]. We adopt standard deviations of the electrical OFDM signals in the interval 0.01 × V π ≤ σ s ≤ 0.25 × V π , despite the suggestion σ s ≥ 0.1 recommended in [6].…”

Section: Ddo-ofdm Formulation Problemmentioning

confidence: 99%

“…However, the extensive number of parameters involved in the performance of orthogonal frequency division multiplexing (OFDM) signals transmission in direct-detection optical systems reverberates in design tradeoffs between transmitted signal power, receiver sensitivity, robustness against fiber chromatic dispersion (CD) and overall system spectral efficiency (SE) [2], [3], [6], [7].…”

Section: Introductionmentioning

confidence: 99%

“…It has been shown in [6] that an optimum sensitivity depends on the signal mean power σ 2 s and the external Mach-Zehnder modulator (MZM) bias point. Furthermore, it is well known that the overall SE of DDO-OFDM systems is affected by the frequency guard band which is necessary to prevent subcarriers-to-subcarriers mixing interference (SSMI) [3], [7].…”

Section: Introductionmentioning

confidence: 99%

“…According to [6], the optical field at output of a MZM characterized by its switching voltage V π and biased by V bias is a bandpass signal centered at frequency f 0 given by…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Performance Optimization of DDO-OFDM Systems through Genetic Algorithms

Almeida

Nunes

Rocha

et al. 2013

2013 BRICS Congress on Computational Intelligence and 11th Brazilian Congress on Computational Intelligence

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The employment of genetic algorithms in parameters optimization of directdetection optical orthogonal frequency division multiplexing (DDO-OFDM) systems in short-range links is reported. Experimental transmission of a 3.56 Gb/s (4-QAM subcarrier mapping) optimized DDO-OFDM system in optical back-to-back (B2B) configuration and through 20 and 40 km of uncompensated standard single-mode fiber (SSMF) was achieved.

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Section: Ddo-ofdm Formulation Problemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…According to [6], the optical field at output of a MZM characterized by its switching voltage V π and biased by V bias is a bandpass signal centered at frequency f 0 given by…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Performance Optimization of DDO-OFDM Systems through Genetic Algorithms

Almeida

Nunes

Rocha

et al. 2013

2013 BRICS Congress on Computational Intelligence and 11th Brazilian Congress on Computational Intelligence

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“…The BC-CO-OFDM system not only uses signal clipping to remove the nonzero values and adopts an odd subcarrier to eliminate the clipping noise, but also introduces DC bias for better modulation. It has been shown that the optimum operation bias point for the MZM in the CO-OFDM system is a zero bias point, and the OFDM signal incurs minimal Q penalty from the up-conversion [10,11] . Therefore, moving the nonzero clipping OFDM signal to adapt to optimal linear modulation for MZM zero bias point is necessary.…”

mentioning

confidence: 99%

Fiber nonlinearity mitigation by PAPR reduction in coherent optical OFDM systems via biased clipping OFDM

Hao¹,

Li²,

Wang³

et al. 2012

中国光学快报

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A new method incorporating biased clipping orthogonal frequency division multiplexing (OFDM) is presented, which mitigates fiber nonlinear effects in a long-haul coherent optical OFDM (CO-OFDM) system. Under the scheme of the method, the wanted signal carried by odd subcarriers is orthogonal to clipping noise and a Mach-Zehnder modulator (MZM) performs the optimal OFDM signal up-converter from the radio frequency (RF) domain to the optical domain. Analysis and simulation results show that fiber nonlinear effects can be effectively mitigated by reducing the peak-to-average power ratio (PAPR) in biased clipping CO-OFDM system. The nonlinearity threshold (NLT) is improved by 5 dB with a reach of 240 km. With a fiber length up to 800 km, system Q value is improved by approximately 2.3, 1.2, and 0.6 dB at a chromatic dispersion of 6, 12, and 16 ps/(nm·km), respectively. Additionally, system Q reaches the maximum when direct currect (DC) bias is equal to the mean value of the OFDM waveform.

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End-to-End Error Control Coding Capability of NB-IoT Transmissions in a GEO Satellite System with Time-Packed Optical Feeder Link

Bas

Dowhuszko

2021

Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering

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This paper focuses on the return link of a GEO satellite system that collects information from a large number of IoT devices that are sparsely distributed in a large geographical area. Narrow-Band (NB) IoT transmissions, with suitable Modulation and Coding Scheme (MCS), are Detected-and-Forwarded onboard the satellite, mapping each QAM symbol of the radio access link (uplink) into another equivalent PAM symbol that is suitable to modulate the intensity of the optical feeder link (downlink). Given the very large number of IoT devices that is expected to be served by the GEO satellite system, the feeder link (downlink) of the return channel is expected to be bottleneck. To tackle this limitation, apart from using an optical feeder link, time-packing is proposed to reduce the transmission time of the feeder link (downlink) without increasing the signal bandwidth and augment the number of IoT devices that could be simultaneously served in the radio access links (uplink). The Inter-Symbol Interference (ISI) that the time-packed feeder link generates is mitigated in part at the satellite gateway, using for this purpose an adaptive linear equalizer. After optical-to-electrical conversion, the NB-IoT codewords that are received in the gateway are decoded, correcting simultaneously errors introduced in both radio access and optical feeder links. The aim of this paper is to evaluate the error correction capability that the MCS of NB-IoT has when used to protect the hybrid radio/optical end-to-end return link, particularly when using a large overlapping factor to increase the optical feeder link data rate.

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Impact of Modulator Bias on the OSNR Requirement of Direct-Detection Optical OFDM

Cited by 34 publications

References 7 publications

Performance Optimization of DDO-OFDM Systems through Genetic Algorithms

Performance Optimization of DDO-OFDM Systems through Genetic Algorithms

Fiber nonlinearity mitigation by PAPR reduction in coherent optical OFDM systems via biased clipping OFDM

End-to-End Error Control Coding Capability of NB-IoT Transmissions in a GEO Satellite System with Time-Packed Optical Feeder Link

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