5/10-Gb/s Burst-Mode Clock and Data Recovery Based on Semiblind Oversampling for PONs: Theoretical and Experimental

Shastri, Bhavin J.; Plant, David V.

doi:10.1109/jstqe.2010.2041326

Cited by 23 publications

(9 citation statements)

References 31 publications

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“…To understand the impact of all these factors on the BBER tests described above, we added them to the data frame presented in figure 7 as configurable parameters: one of them is the CID field (consecutive identical bits [4], basically consecutive '0's constituting the silent period between two gaps) to which a phase step is added (∆φ in degrees, 360 o =1 bit clock period) modelling the phase change between two bursts. The output power of the ONU2 was modulated by an optical attenuator (JDSU, MAP-200 mVOA-A2) to introduce a configurable dynamic range (α).…”

Section: Upstream Path Characterizationmentioning

confidence: 99%

“…The following sections present the impact of the abovedescribed parameters on the BBER and PLR performance of the TTC-PON system equipped with two ONUs. As the type of CDR used in the FPGA for the OLT has also an impact on the ability of the system to cope with certain parameters (essentially the phase step and the lengths of the CID and the preamble), some parameters were analyzed for two CDR architectures: one based on conventional phase-tracking CDR [4] (referred as N-CDR) and one based on oversampling CDR without phase tracking [4,5] (referred as O-CDR), with the objective to quantify their immunity to the system parameters.…”

Section: Upstream Path Characterizationmentioning

confidence: 99%

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Metrics and methods for TTC-PON system characterization

Kolotouros¹,

Baron²,

Marı́n³

et al. 2014

J. Inst.

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A new generation FPGA-based Timing, Trigger and Control (TTC) system based on emerging Passive Optical Network (PON) technology is being investigated to potentially replace the existing off-detector TTC system used by the LHC experiments. The new system must deliver trigger and data with low and deterministic latency as well as a recovered bunch clock with picosecond-level jitter. This new topology offers major improvements over its predecessor: bi-directionality as well as higher capacity. This paper focuses on the figures of merit used to characterize the TTC-PON system both downstream and upstream, on the techniques used to extract them and on the impact of these first results in optimizing the architecture.

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Section: Upstream Path Characterizationmentioning

confidence: 99%

Section: Upstream Path Characterizationmentioning

confidence: 99%

Metrics and methods for TTC-PON system characterization

Kolotouros¹,

Baron²,

Marı́n³

et al. 2014

J. Inst.

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“…We have experimentally tested variants of this BM-CDR in various experimental testbeds including: (1) 20-km time-division multiplexing (TDM) gigabit Ethernet PON (GEPON) uplink at 5 Gb/s [7]; (2) 1300-km deployed fiber link spanning Montreal to Quebec City and back, at 1.25 Gb/s [8]; and (3) 7-user 20-km spectral amplitude coded optical code-division multiple access (SAC-OCDMA) PON uplink at 625 Mb/s [9,10]. In each case, the BM-CDRs have shown to achieve a BER < 10 −10 and a packet loss ratio (PLR) < 10 −6 while featuring instantaneous (0 preamble bit) phase acquisition for any phase step (±2π rad) between successive bursts.…”

Section: Burst-mode Receiversmentioning

confidence: 99%

Overlapped Subcarrier Multiplexed WDM PONs Enabled by Burst-Mode Receivers

et al. 2011

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A symmetric WDM PON architecture using an innovative overlapped-SCM scheme that maximizes the spectrum usage of a bandwidth-limited RSOA is demonstrated. In addition, burst mode receivers for this application are discussed. OCIS codes: (060.2330) Fiber optics communications; (060.4250) Networks 1. Introduction Passive optical networks (PONs) are recognized as an economic solution to alleviate the bandwidth bottleneck in access networks by deploying fiber-to-the-home. Reflective semiconductor optical amplifier (RSOA)-based colorless optical network unit (ONU) transmitters have been widely used in wavelength-division multiplexed (WDM) passive optical networks (PONs) [1,2]. Recently, subcarrier multiplexing (SCM) has been proposed for single-feeder (single-wavelength) PONs to mitigate the effect of Rayleigh backscattering [3-5]. In addition to transmission challenges, chip sets for PONs must manage upstream data paths because the network is point-tomultipoint. Using time-division multiple access, multiple ONUs transmit data to the optical line terminal (OLT) in the central office. Due to optical path differences, packets can vary in amplitude and phase to create bursty data. Consequently, this necessitates burst-mode receivers (BMRx) at the OLT. The BMRx front-end is responsible for amplitude recovery, whereas clock and data recovery (CDR) together with fast phase acquisition is performed by a burst-mode CDR (BM-CDR) circuit. 2. Subcarrier Multiplexed WDM PONs Here we introduce an innovative overlapped subcarrier multiplexing (O-SCM) technique that allows a certain overlap between uplink and downlink frequency spectra that permits higher symmetrical bit rates compared to conventional SCM techniques by efficiently utilizing the RSOA bandwidth [6]. The architecture of the O-SCM WDM PON shown in Fig. 1 employs existing infrastructure constraints to reduce potential deployment costs with a single feeder connecting the OLT to an arrayed waveguide grating (AWG)-based remote node (RN). Full duplex communication is achieved over the same feeder at the same wavelength using the proposed O-SCM technique. The downlink is kept at baseband, whereas the uplink is up-converted to an RF subcarrier using the proposed O-SCM. At the ONU side, a fraction of the downlink power is passed to a p-in photodiode for detection, and the remaining part seeds a gain saturated RSOA for proper re-modulation to be able to hide the downlink modulation within that of the uplink. For this reason, the extinction ratio (ER) of the uplink is also set higher than that of the downlink [2]. As the RSOA is more saturated, the downlink modulation is highly suppressed allowing a 100% O-SCM where the subcarrier frequency f sc is equal to the bit rate. Therefore, the splitting ratio of the ONU 1×2 coupler is carefully selected to maximize the power efficiency of the system (to guarantee that the RSOA is saturated and to have enough power for downlink detection). Selecting the proper ER for both uplink and downlink, and ensuring that the RSOA is deeply saturated,...

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“…high power consumption and poor jitter rejection characteristics [5]. Alternatively, time domain oversampling CDRs have demonstrated a CDR locking time of 8 ns [6]. However, they have high circuit complexity and high power consumption because they require a high frequency clock to drive the data sampler [5].…”

Section: Introductionmentioning

confidence: 99%

“…However, current work on clock phase caching have been purely experimental, and although analytical models of other approaches to CDR exist, such as for oversampling CDRs [6], [10], bang-bang phase interpolator CDRs [11] and for GVCO CDRs [10], no equivalent has been explored for the clock phase cached approach to CDR. Here, we introduce an analytical model of the bit error rate (BER) and CDR locking time performance of clock phase cached links.…”

Section: Introductionmentioning

confidence: 99%

Modeling the Performance of the Clock Phase Caching Approach to Clock and Data Recovery

Clark¹,

Liu²

2022

J. Lightwave Technol.

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Optical switching could enable data center networks to keep pace with the rapid growth of intra-data center traffic, however, sub-nanosecond clock and data recovery time is crucial to enabling optically-switched data center networks to transport small packet dominated data center traffic with over 90% efficiency. We review the clock-synchronized approach to clock and data recovery, which enables sub-nanosecond switching time in optically switched networks. We then introduce an analytical model to mathematically explore the operation of clock phase caching, and use this model to explore the impact of factors such as fiber temperature, clock jitter and symbol rate on the BER and clock and data recovery locking time performance of the clock phase caching approach, as well as their impact on scalability. Using commercial data center parameters matching those used in our previous experimental research, we find that our analytical model provides estimates that closely match our previous experimental results, validating its use for making predictions of the performance of clock phase cached systems.

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5/10-Gb/s Burst-Mode Clock and Data Recovery Based on Semiblind Oversampling for PONs: Theoretical and Experimental

Cited by 23 publications

References 31 publications

Metrics and methods for TTC-PON system characterization

Metrics and methods for TTC-PON system characterization

Overlapped Subcarrier Multiplexed WDM PONs Enabled by Burst-Mode Receivers

Modeling the Performance of the Clock Phase Caching Approach to Clock and Data Recovery

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