Detection of a Single 40 Gb/s Polarization-Multiplexed QPSK Channel With a Real-Time Intradyne Receiver in the Presence of Multiple Coincident WDM Channels

Nelson, L.E.; Woodward, S.L.; Foo, S.; Moyer, M.; Beckett, D. J. S.; O’Sullivan, Maurice; Magill, Peter

doi:10.1109/jlt.2010.2071853

Cited by 24 publications

(12 citation statements)

References 14 publications

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“…Recently, extensive efforts see, e.g., [1]- [4] have been devoted to utilizing both polarizations of an optical signal in a fiber channel to convey information. The dual polarization (DP) scheme makes it possible to exploit all degrees of freedom in a fiber-optical channel to boost the data rate [5], [6].…”

Section: Introductionmentioning

confidence: 99%

Signal Statistics in Fiber-Optical Channels With Polarization Multiplexing and Self-Phase Modulation

Beygi

Agrell

Karlsson

et al. 2011

J. Lightwave Technol.

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Abstract-In this paper, the statistics of received signals in a single-channel dispersion-managed dual-polarization fiber-optical channel are derived in the limit of low dispersion. The joint probability density function (pdf) of the received amplitudes and phases of such a system is derived for both lumped and distributed amplification. The new pdf expressions are used to numerically evaluate the performance of modulation formats over channels with nonlinear phase noise. For example, a sensitivity gain of up to 2 dB is calculated for a specific system using polarization-multiplexed 8-ary phase shift keying compared with a similar single-polarization system at the same spectral efficiency and a symbol error rate of 5 × 10 −4 . Moreover, the accuracy of the derived pdf is evaluated for some single-channel dispersionmanaged fiber-optical links with different dispersion-maps using the split-step Fourier transform method.

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Section: Introductionmentioning

confidence: 99%

Signal Statistics in Fiber-Optical Channels With Polarization Multiplexing and Self-Phase Modulation

Beygi

Agrell

Karlsson

et al. 2011

J. Lightwave Technol.

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“…However, any real implementation shows a limited common mode rejection ratio (CMRR) [13] [14]. Following the derivations published in [12], the total OSNR contribution induced by an insufficient CMRR scales quadratically with the coincidently beating channel power.…”

Section: Filterless Optical Networkmentioning

confidence: 99%

On the Filter Narrowing Issues in Elastic Optical Networks

Fàbrega¹,

Moreolo²,

Martin³

et al. 2016

J. Opt. Commun. Netw.

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Abstract-This paper describes the problematic of filter narrowing effect in the context of next generation elastic optical networks. First, three possible scenarios are introduced: the transition from actual fixed-grid to a flexi-grid network; the generic full flexi-grid network; and a proposal for filterless optical network. Next, we investigate different transmission techniques and evaluate the penalty introduced by the filtering effect when considering: Nyquist WDM, SSB DD-OFDM and symbol-rate variable DP-4QAM. Also, different approaches to compensate for the filter narrowing effect are discussed. Results show that the specific needs per each scenario can be fulfilled by the aforementioned technologies and techniques, or a combination of them, when balancing performance, network reach and cost.Index Terms-Networks, optical communications, elastic optical networks, flexi-grid, WSS. I. INTRODUCTIONThe future adoption of elastic optical network (EON), mainly fostered by the advent of next technologies (e.g., media, HDTV, 5G, Internet of Things, etc.) and backed by the considerable advances of transmission techniques in terms of flexibility and capacity, is heading to undertake new challenges and goals. In fact, when adopting the flexi-grid paradigm [1], optical channels with different bandwidth occupation can coexist within the same fiber. Some of these channels, denominated as super-channels, are wider in frequency and comprise multiple sub-channels transmitted

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“…If those two currents calculated in Eqs. (14) and (15) are guaranteed to be below the maximum ratings of the TIA, TIA saturation will be avoided and linear operation will be achieved. In our experiment, the TIAs had maximum ratings of 4 mA and 3 mA for I DC and I ACppd , respectively.…”

Section: Impact Of Lo Power On the Snr Of Channel 9 At Various Distanmentioning

confidence: 99%

“…Colorless reception in the context of coherent optical communication was studied from a theoretical standpoint more than two decades ago [13]; however, the absence of commercial narrow linewidth lasers and high speed integrated circuits (ICs) prevented any practical implementation. Recently, there have been some reports on experimental colorless coherent reception by utilizing either a conventional CRx front-end followed by single-ended detection [14], which suffers from limited maximum channel count and poor dynamic range due to the inability to reject the self-beat common mode noise, or a more complicated receiver front-end followed by single-ended detection to enable rejecting the self-beat noise [15]. Later in [16], Zhang et al presented design guidelines and performance limits of colorless reception employing balanced detection based on simulation and analytical predictions.…”

Section: Introductionmentioning

confidence: 99%

Analytical and experimental performance evaluation of an integrated Si-photonic balanced coherent receiver in a colorless scenario

Morsy-Osman¹,

Chagnon²,

Xu³

et al. 2014

Opt. Express

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We study analytically and experimentally the performance limits of a Si-photonic (SiP) balanced coherent receiver (CRx) co-packaged with transimpedance amplifiers (TIAs) in a colorless WDM scheme. Firstly, the CRx architecture is depicted and characterization results are presented. Secondly, an analytical expression for the signal-to-noise ratio (SNR) at the CRx output is rigorously developed and various noise sources in the context of colorless reception are outlined. Thirdly, we study experimentally the system-level CRx performance in colorless reception of 16 × 112 Gbps PDM-QPSK WDM channels. Using a 15.5 dBm local oscillator (LO) power, error free transmissions over 4800 and 4160 km at received powers of -3 and -21 dBm per channel, respectively, were achieved in a fully colorless and preamplifierless reception. Next, a set of measurements on one of the center WDM channels is performed where the LO power, received signal power, distance, and number of channels presented to the CRx are swept to evaluate the performance limits of colorless reception. Results reveal that the LO beating with optical noise incoming with the signal is a dominant noise source regardless of received signal power. In the high received signal power regime (~0 dBm/channel), the self-beat noise from out-of-band (OOB) channels is an additional major noise source especially for small LO-to-signal power ratio, short reach and large number of OOB channels. For example, at a received signal power of 0 dBm/channel after 1600 km transmission, the SNR difference between the fully filtered and colorless scenarios, where 1 and 16 channels are passed to the CRx respectively, grows from 0.5 to 3.3 dB as the LO power changes from 12 to 0 dBm. For low received power (~-12 dBm/channel), the effect of OOB channels becomes minor while the receiver shot and thermal noises become more significant. We identify the common mode rejection ratio (CMRR) and sensitivity as the two important CRx specifications that impact the performance at high and low received signal power regimes, respectively. Finally, an excellent match between experimental and analytical SNRs is proven after the derived SNR model is fitted to the experimental data in a least-squares sense. The model is then used to predict that the CRx can operate colorlessly for a fully populated WDM spectrum with 80 channels provided that the LO-to-signal power ratio is properly set.

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Detection of a Single 40 Gb/s Polarization-Multiplexed QPSK Channel With a Real-Time Intradyne Receiver in the Presence of Multiple Coincident WDM Channels

Cited by 24 publications

References 14 publications

Signal Statistics in Fiber-Optical Channels With Polarization Multiplexing and Self-Phase Modulation

Signal Statistics in Fiber-Optical Channels With Polarization Multiplexing and Self-Phase Modulation

On the Filter Narrowing Issues in Elastic Optical Networks

Analytical and experimental performance evaluation of an integrated Si-photonic balanced coherent receiver in a colorless scenario

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