Theoretical and experimental study on PMD-supported transmission using polarization diversity in coherent optical OFDM systems

Shieh, William; Yi, Xingwen; Ma, Yaoguang; Tang, Yan

doi:10.1364/oe.15.009936

Cited by 137 publications

(86 citation statements)

References 14 publications

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“…2. The extension to the case of polarization multiplexing is straightforward and can be found in [25], [26].…”

Section: B Ofdmmentioning

confidence: 99%

“…In the optical communication literature, the investigation on OFDM is motivated by its effectiveness in mitigating linear channel impairments, such as group velocity dispersion (GVD) and polarization mode dispersion (PMD), by simply setting a proper cyclic prefix overhead and using a one-tap equalizer at the receiver, and by the implicit parallelization of the processing due to the IFFT/FFT operations, which clearly represents an advantage in high-speed optical links [25]. The optical channel does not entail any changes in the principles of the OFDM technique-the use of polarization multiplexing simply implies the adoption of a couple of OFDM transmitters and a couple of FFT blocks at the receiver with a two-dimensional 1-tap equalizer [25], [26].…”

Section: B Ofdmmentioning

confidence: 99%

“…The optical channel does not entail any changes in the principles of the OFDM technique-the use of polarization multiplexing simply implies the adoption of a couple of OFDM transmitters and a couple of FFT blocks at the receiver with a two-dimensional 1-tap equalizer [25], [26]. For this reason, most of the works published on optical OFDM deal with the experimental demonstration of different approaches and solutions to overcome technological issues [26], [29]- [31].…”

Section: B Ofdmmentioning

confidence: 99%

See 2 more Smart Citations

OFDM versus Single-Carrier Transmission for 100 Gbps Optical Communication

Barbieri

Colavolpe

Foggi

et al. 2010

J. Lightwave Technol.

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Abstract-We analyze the orthogonal frequency division multiplexing (OFDM) technique in long-haul next generation optical communication links and compare it with the well-established single-carrier (SC) data transmission using high-level modulation formats and coherent detection. The analysis of the two alternative solutions is carried out in the 100 Gbps scenario, which is commonly considered to be the next upgrade of existing optical links, with special emphasis on quaternary phase-shift keying (QPSK) modulations. The comparison between OFDM and SC takes into account the main linear and nonlinear impairments of the optical channel, e.g., group velocity dispersion (GVD), polarization mode dispersion (PMD), self-phase modulation (SPM), cross-phase modulation (XPM), and four-wave mixing (FWM), as well as the phase noise due to transmit and receive lasers, their relative frequency offset, other synchronization aspects, the overall complexity, the power and spectral efficiency, and the technological constraints.Index Terms-Cross-phase modulation (XPM), four-wave mixing (FWM), group velocity dispersion (GVD), optical coherent transmission systems, orthogonal frequency division multiplexing (OFDM), phase-shift keying (PSK), polarization mode dispersion (PMD), self-phase modulation (SPM), single-carrier transmissions.

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“…2. The extension to the case of polarization multiplexing is straightforward and can be found in [25], [26].…”

Section: B Ofdmmentioning

confidence: 99%

Section: B Ofdmmentioning

confidence: 99%

Section: B Ofdmmentioning

confidence: 99%

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OFDM versus Single-Carrier Transmission for 100 Gbps Optical Communication

Barbieri

Colavolpe

Foggi

et al. 2010

J. Lightwave Technol.

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“…Another alternative is to split the received light into two orthogonal polarizations and process in separate branches of the receiver. The performance of such a diversity receiver would be independent of the state of polarization of the received signal [3] [4].The paper presents a performance analysis of a coherent optical OFDM system in terms of its BER. Also a performance comparison is done to show the significance of polarization diversity scheme in coherent architecture.…”

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confidence: 99%

Performance analysis of direct detection and coherent detection system for optical OFDM using QAM and DPSK

Nair¹

2013

IOSRJEN

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-In this paper a theoretical study is conducted regarding the effect of OOFDM in radio over fiber networks (RoF). The system was simulated at 50Gbps for a transmission distance of 1000km over standard single mode fiber. A performance analysis was conducted to compare the performance of direct detection and coherent detection schemes in terms of their BER, dispersion tolerance and Q factor. The improvement in performance with the use of polarization diversity schemes in CO-OFDM is studied. The study was conducted with QAM and DPSK modulations. The effect of local oscillator power in coherent detection, and that of the laser launch power are studied. The study also shows the slight degradation in performance with increase in subcarrier.Keywords: -Coherent detection, OOFDM, Q Factor, RoF I.INTRODUCTION There has been a drastic increase in the demand for high speed communication with mobile connectivity. High speed communication has been traditionally facilitated over wired infrastructure , particularly optical fiber, while mobile communication is supported by wireless infrastructure. But the wireless network has severe performance degradation due to interference, low data rate etc. The design of communication networks that feature high-speed and mobility is facilitated by radio over fiber networks [1].Orthogonal frequency division multiplexing (OFDM) has been an important candidate in wireless communication since many years. Recently optical OFDM has emerged as a new trend in optical communication networks to combat the effects of dispersion in optical fiber [2][5] [6]. Optical OFDM is mainly classified into direct detection system and coherent detection system. In direct detection system a single photodiode is used , While in coherent detection the principle of optical mixing is utilized with local oscillator and optical hybrid. The superior performance of CO-OFDM in terms of its dispersion tolerance and OSNR requirements makes it a suitable candidate for long haul networks.Coherent reception requires that the polarization of local oscillator should be matched with that of the received signal .Otherwise severe performance degradation results. The state of polarization of light travelling through the conventional fiber varies randomly. Hence polarization tracking device is necessary at the receiver, which is impractical in field application. Another alternative is to split the received light into two orthogonal polarizations and process in separate branches of the receiver. The performance of such a diversity receiver would be independent of the state of polarization of the received signal [3] [4].The paper presents a performance analysis of a coherent optical OFDM system in terms of its BER. Also a performance comparison is done to show the significance of polarization diversity scheme in coherent architecture. A detailed description of CO-OFDM system is given in section 2. Section 3 details the simulations. The results and discussions are given in section 4 and the paper is concluded in section 5.

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“…SPM can be partially removed by imposing a phase modulation proportional to the instantaneous received CO-OFDM channel power before the fast Fourier transform (FFT) in the OFDM receiver [11] . This phase modulation can be expressed as S 1 (t) = S Rx (t)e −jβ|SRx(t)| 2 , where S 1 (t) is the SPM mitigated CO-OFDM signal, S Rx (t) is the time domain signal of the CO-OFDM channel at the receiver, and β is a phenomenological nonlinear factor that can be estimated without the fiber link information.…”

mentioning

confidence: 99%

Fiber nonlinearity compensation for CO-OFDM transmission with 10.7-Gb/s NRZ-OOK neighbors

Deng

Zhang

et al. 2012

中国光学快报

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Fiber nonlinearity limits the use of coherent optical orthogonal frequency division multiplexing (CO-OFDM) to upgrade wavelength-division multiplexing (WDM) systems using legacy non-return-to-zero-onoff-keying (NRZ-OOK) channels. This letter proposes to compensate for the fiber nonlinearity of CO-OFDM with NRZ-OOK neighbors by combining digital signal processing (DSP)-based self-phase modulation (SPM) post-compensation with pilot-tone-based cross-phase modulation (XPM) compensation. The simulation results demonstrate that the optimum low-pass filter bandwidth for pilot-tone-based XPM compensation depends on the pilot-to-signal ratio value and launch optical power. Our method allows a 4-dB increase in the launch power for a 40-Gb/s single polarization CO-OFDM channel placed in the middle of six 10.7-Gb/s NRZ channels in a 50-GHz space and 1 200-km WDM system. Coherent optical orthogonal frequency division multiplexing (CO-OFDM) is immune to linear impairments in optical fiber transmissions, such as chromatic dispersion (CD) and polarization mode dispersion (PMD) [1,2] . However, fiber nonlinearities for long-haul CO-OFDM transmission systems restrict the optical power launched into each fiber span and the transmission distance [3,4] . Thus, several studies have been devoted to the nonlinearity compensation for CO-OFDM systems [5−7] . In legacy wavelength-division multiplexing (WDM) optical networks, non-return-to-zero-on-off-keying (NRZ-OOK) is the dominant modulation format, and the periodic dispersion map is used to compensate for CD. In these optical networks, CO-OFDM can be used to upgrade a few wavelengths. The mixed modulation formats can then coexist in one optical link. However, the fiber nonlinearity performance of CO-OFDM is poor in such networks due to self-phase modulation (SPM)[8] and cross-phase modulation (XPM) from the NRZ neighbors operated at 10.7 Gb/s [9] . Therefore, fiber nonlinearity compensation for the CO-OFDM channel is useful. Using the phase modulation proportional to the bandwidthlimited received intensity on all channels to cancel crossphase modulation XPM caused by NRZ neighbors was proposed in Ref. [10], and the nonlinearity threshold was improved to about 2 dB.In this letter, the effectiveness of digital signal processing (DSP)-based SPM post-compensation and pilottone (PT)-based XPM compensation is demonstrated to mitigate the fiber nonlinear impairments of CO-OFDM transmission with 10.7-Gb/s NRZ neighbors in the conventional WDM system. The optimum low-pass filter (LPF) bandwidth for PT-based XPM compensation was also shown to depend on the pilot-to-signal ratio (PSR) at different launch optical powers, which is different from the PT-aided phase noise compensation in Ref. [2]. In a numerical simulation of a 50-GHz spacing and 1 200-km WDM transmission with inline dispersion compensation, the optimum launch power for a 40-Gb/s CO-OFDM channel placed in the middle of six 10.7-Gb/s NRZ channels is increased by 4 dB, and the Q-factor can also be improved by 1.5 dB at the optimal ope...

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Theoretical and experimental study on PMD-supported transmission using polarization diversity in coherent optical OFDM systems

Cited by 137 publications

References 14 publications

OFDM versus Single-Carrier Transmission for 100 Gbps Optical Communication

OFDM versus Single-Carrier Transmission for 100 Gbps Optical Communication

Performance analysis of direct detection and coherent detection system for optical OFDM using QAM and DPSK

Fiber nonlinearity compensation for CO-OFDM transmission with 10.7-Gb/s NRZ-OOK neighbors

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