Optical performance monitoring in coherent optical OFDM systems

Shieh, William; Tucker, R.S.; Chen, Wei; Yi, Xingwen; Pendock, G.J.

doi:10.1364/oe.15.000350

Cited by 78 publications

(37 citation statements)

References 13 publications

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“…Although accurate evaluation relies on numeric simulation, there are a few analytical estimation methods [16], [20]. An approximation in linear scale is given below [16] (8) (9) (10) where SNR per symbol is linearly dependent on OSNR by the coefficient because of coherent detection. Under ideal conditions, is the ratio of 12.5 GHz (0.1-nm OSNR resolution) to the receiver electrical bandwidth.…”

Section: B Simulation Results Of Laser Phase Noise Effectsmentioning

confidence: 99%

“…There are two ways to calculate the BER, consequently Q-factor. The first way is based on AWGN assumption and calculated from SNR by (12) in the Appendix, which is essentially the constellation spreading [10], [21]. Note this calculation method inherits the well-documented QAM performance to calculate the Q-factor; otherwise it would involve the discussion of probability density functions and decision areas [21], [26].…”

Section: Nonlinear Phase Noise From Optical Fiber Transmissionsmentioning

confidence: 99%

“…The SNR per symbol of coherent optical OFDM (CO-OFDM) can be calculated from the noise spreading of constellation points as described in [10]. The SNR per symbol and SNR per bit are related by (11) In the AWGN channel, single carrier and OFDM have about the same performance in terms of SNR, and the BER of M-QAM-OFDM is given by [20], [21] (12) (13) where and is an even number.…”

Section: Appendixmentioning

confidence: 99%

“…• The transmission channel characteristics can be monitored by means of receiver signal processing [10]. Subsequently, all the OFDM parameters, from subcarrier number to individual subcarrier modulation format, can be optimized [11].…”

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confidence: 99%

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Phase Noise Effects on High Spectral Efficiency Coherent Optical OFDM Transmission

Shieh

2008

J. Lightwave Technol.

141

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Abstract-There are three major advantages for coherent optical orthogonal frequency-division multiplexing (CO-OFDM) transmission using digital signal processing. First, coherent detection is realized by digital phase estimation without the need for optical phase-locked loop. Second, OFDM modulation and demodulation are realized by the well-established computation-efficient fast Fourier transform (FFT) and inverse FFT. Third, adaptive data rates can be supported as different quadrature amplitude modulation (QAM) constellations are software-defined, without any hardware change in transmitter and receiver. However, it is well-known that coherent detection, OFDM, and QAM are all susceptible to phase noise. In this paper, theoretical, numerical, and experimental investigations are carried out for phase noise effects on high spectral efficiency CO-OFDM transmission. A transmission model in the presence of phase noise is presented. By using simulation, the bit error rate floors from finite laser linewidth are presented for CO-OFDM systems with high-order QAM constellations. In the experiments, the phase noise effects from both laser linewidth and nonlinear fiber transmission are investigated. The fiber nonlinearity mitigation based on receiver digital signal processing is also discussed.

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Section: B Simulation Results Of Laser Phase Noise Effectsmentioning

confidence: 99%

Section: Nonlinear Phase Noise From Optical Fiber Transmissionsmentioning

confidence: 99%

Section: Appendixmentioning

confidence: 99%

mentioning

confidence: 99%

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Phase Noise Effects on High Spectral Efficiency Coherent Optical OFDM Transmission

Shieh

2008

J. Lightwave Technol.

141

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“…Moreover, these modulation formats involve advanced signal processing algorithms in the receivers which can provide information about the impairments experienced by the incoming signals. In (Shieh et al 2007), OCE through receiver signal processing is proposed as one approach to optical performance monitoring. Most importantly, performance monitoring by OCE is basically free because it is embedded as a part of the intrinsic receiver signal processing.…”

Section: Impact Of New Modulation Formatsmentioning

confidence: 99%

Signal Processing, Management and Monitoring in Transmission Networks

Vázquez

Montalvo

Ahmed

et al. 2011

Optical Transmission

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1higher, linear and non-linear fibre impairments become prominent factors affecting the signal quality. Thus, new techniques in both physical layer and network layer are necessary for mitigating impairments to accommodate high-speed traffic (Tomkos et al. 2002). On the other hand, the flexibility of modern networks with dynamic and distributed management, where lightpaths can be dynamically and automatically assigned end-to-end, increases the risk of changing path conditions that affect signal quality and consequently quality of service (QoS) over the lifetime of a connection as well as for subsequent connection set-up requests (on-demand routing and wavelength assignment -RWA). For traditional connection provisioning an ideal physical layer, ignoring transmission impairments (Chlamtac et al. 1992) could be assumed because the implicit per hop regeneration (optics-to-electronics-to-optics conversion -O/E/O) compensated signal impairments hop-by-hop in a rather static manner (section commissioning). For end-to-end all-optically switched connections using photonic cross-connect switches (PXC), the conditions change and common practice is not applicable. Anyhow, intelligent connection provisioning is an important traffic engineering problem, and minimising operational cost as well as efficiently utilising network resources is the main driver. In this context, it seems important to have flexible routing protocols that take into consideration the most relevant physical impairments, and are able to exchange messages with their values as part of the route information with others. This condition, if definitely used to calculate routing, will surely assure better success in data delivery over the network (Huang et al. 2005). Irrespective of the control architecture chosen by an operator of an optical network, the included control plane (in charge of setting up and tearing down optical circuits; also known as lightpaths) needs to have a proper set of tools to satisfyingly deal with physical impairments. The most essential tools are: optical signal monitoring, signal processing and impairment compensation techniques (each all-optically and/or electrically). With the help of these tools, it is possible to predict the QoT (quality of transmission) attainable for a lightpath at a given time (i.e. the latest network-wide monitoring instant), and the control plane can route requests across the network

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Integrated Optical Tunable Delay Line and Microwave Photonic Beamforming Chip: A Review

Shi,

Niu,

Shi

et al. 2024

Laser & Photonics Reviews

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The microwave photonic (MWP) beamforming chip is a crucial component for achieving the miniaturization of optically controlled phased array radar systems. It addresses the unwanted ‘beam squint’ effect of traditional electronic antenna arrays in processing wideband RF signals through optical tunable delay lines (OTDLs), which has garnered significant attention and research efforts in recent years. This review provides a comprehensive overview of the latest research progress on the classification, working principle, calibration and delay measurement methods, driving and control technologies, and system function verifications of OTDL and MWP beamforming chips. Also, discussions about the challenges that need to be addressed and the future development trends for this technology are given.

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Optical performance monitoring in coherent optical OFDM systems

Cited by 78 publications

References 13 publications

Phase Noise Effects on High Spectral Efficiency Coherent Optical OFDM Transmission

Phase Noise Effects on High Spectral Efficiency Coherent Optical OFDM Transmission

Signal Processing, Management and Monitoring in Transmission Networks

Integrated Optical Tunable Delay Line and Microwave Photonic Beamforming Chip: A Review

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