Optimum Design for RF-to-Optical Up-Converter in Coherent Optical OFDM Systems

Tang, Yan; Shieh, William; Yi, Xingwen; Evans, R.J.

doi:10.1109/lpt.2007.893582

Cited by 84 publications

(35 citation statements)

References 5 publications

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“…The so-generated OFDM waveform carries 10.7 Gbit/ s data. These two signals are fed into I and Q ports of an optical I / Q modulator, respectively, to perform direct upconversion of OFDM baseband signals from the RF domain to the optical domain [25]. The optical OFDM signal from the I / Q modulator is first inserted into a homemade PMD emulator and then fed into a recirculation loop, which includes one span of 100 km SSMF fiber and an EDFA to compensate the loss.…”

Section: A Polarization-mode Dispersion: Detriment or Benefit?mentioning

confidence: 99%

“…As such, this paper focuses on signal processing, experimentation, and the underlying technologies of CO-OFDM, serving as a complement to our recent invited paper [24], which concentrates on theory and design. Figure 1 shows the conceptual diagram of a generic CO-OFDM system including five basic functional blocks [1,25]: RF OFDM transmitter, RTO upconverter, optical link, OTR downconverter, and RF OFDM receiver. In this paper, the term RF is used interchangeably with electrical to signify the physical interface in contrast with that in the optical domain.…”

Section: Introductionmentioning

confidence: 99%

“…The RF OFDM transmitter and receiver have been studied in RF systems [21] and thus will hold the same importance to CO-OFDM systems. One unique aspect of the CO-OFDM investigation is that it brings new sources of nonlinearity, including RTO upconversion [25], OTR downconversion, and fiber link transmission [26]. In this section, we will concentrate on the signal processing aspect of CO-OFDM and therefore assume perfect linearity in each functional block.…”

Section: Introductionmentioning

confidence: 99%

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Coherent optical OFDM: has its time come? [Invited]

et al. 2008

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There has been growing interest in coherent optical orthogonal frequencydivision multiplexing (CO-OFDM). We aim to present the case that the time for CO-OFDM has come, in terms of the demand from today's ever-advancing optical networks and the availability of its underlying technologies. We first lay out the signal processing aspect for CO-OFDM and then show a 2 ϫ 2 multiple-input-multiple-output (MIMO) OFDM representation for the singlemode fiber optical channel. Through numerical simulation and experimental demonstration, we further present and discuss various MIMO-OFDM systems focusing on their polarization-mode dispersion resilience. Among those systems, the 2 ϫ 1 MIMO-OFDM configuration incorporating polarization-time coding shows promise for optical access networks and broadcast networks. Finally, another class of the frequency-domain equalization techniques, namely, incoherent or coherent optical single-carrier frequency-domain equalization (CO-SCFDE) is discussed and experimentally demonstrated.

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Section: A Polarization-mode Dispersion: Detriment or Benefit?mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Coherent optical OFDM: has its time come? [Invited]

et al. 2008

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“…In recent years we observe the drastic increase of optical OFDM (OOFDM) in the field of fiber communication [8]. This is better modulation technique for long-haul transmission of coherent detection optical OFDM system or direct detection of optical OFDM system [9], [10]. According to the different receiver structure, OOFDM is classified in to two types one is direct detection optical OFDM (DDOOFDM) system and other is coherent optical OFDM (COOFDM) system.…”

Section: Introductionmentioning

confidence: 99%

Performance analysis of direct detection optical OFDM systems

Kumar¹,

Anilkumar²,

Vijayakumar³

et al. 2018

IJET

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Orthogonal frequency division multiplexing (OFDM) is a multicarrier modulation technique, in which the data information is carried over many lower rate subcarriers. This technique is started effectively using in both line communication and wireless communication systems. This modulation technique has been actively started in the field of light wave communication called optical OFDM (OOFDM) system. OOFDM is a multicarrier modulation technique; it is used to overcome the problem of inter-symbol interference due to the chromatic dispersion and polarization mode dispersion of the fiber channel. In this paper, we have done simulation on direct detection optical OFDM (DDOOFDM) system with data rate of 10Gbps and measuring performance analysis of DDOOFDM system with respect to the received optical power and various full width half maximum value of the continuous wave laser source. This analysis is simulated using RSOFT Design Group OptSim Version-5.2.

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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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Optimum Design for RF-to-Optical Up-Converter in Coherent Optical OFDM Systems

Cited by 84 publications

References 5 publications

Coherent optical OFDM: has its time come? [Invited]

Coherent optical OFDM: has its time come? [Invited]

Performance analysis of direct detection optical OFDM systems

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

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