Multi-Rate Multi-Format CFP/CFP2 Digital Coherent Interfaces for Data Center Interconnects, Metro, and Long-Haul Optical Communications

Loussouarn, Yann; Pincemin, Erwan; Pan, Mike; Miller, G.; Gibbemeyer, Alan; Mikkelsen, B.

doi:10.1109/jlt.2018.2875249

Cited by 26 publications

(3 citation statements)

References 15 publications

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“…1 shows an example of a transceiver configuration using digital coherent technology for single-core SMF transmission. A digital coherent transceiver consists of three elements: a transmitter, a receiver, and a DSP [22]. In the transmitter, the data bits of a client signal are interleaved and encoded to the code words of FEC codes.…”

Section: A Digital Coherent Transceivermentioning

confidence: 99%

Coherent Optical Transceivers Scaling and Integration Challenges

et al. 2022

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The advancement of digital coherent technologies has dramatically increased the system capacity per singlecore single-mode fiber to the point that we can now approach the Shannon limit by utilizing high-order modulation formats and high-coding gain forward error correction (FEC) codes.Because the required energy per bit increases exponentially the closer we get to the Shannon limit, extending the available optical bandwidth by using ultrawideband wavelength-division multiplexing (WDM) and/or spatial-division multiplexing (SDM) is indispensable for increasing the system capacity with high energy efficiency. However, simple extensions of wavelength resources and spatial parallelization dramatically increase the number of transceivers (TxRxs) in proportion to the wavelength/spatial multiplicity. The key to achieving cost-and energy-efficient systems is to reduce the system complexity by using high-density integration and broadband optelectronics.In this article, we overview and discuss the recent advances of coherent optical transceivers integrated with an optical front end and digital signal processing (DSP)/application-specific integrated circuit (ASIC). We then present the transponder architectures and the challenges involved in applying them for massive parallelized transmission systems.

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Section: A Digital Coherent Transceivermentioning

confidence: 99%

Coherent Optical Transceivers Scaling and Integration Challenges

et al. 2022

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“…The proposed transceiver then works similarly as a gearbox, changing gears (formats) to allow the increase in system speed. Although the idea of a multi-bit rate and multi-format transceiver is not entirely new [27][28][29], our proposal is, to the best of our knowledge, the first one of its kind to use PAM-M modulation formats together with their DB counterparts to set-up a flexible transceiver. This choice of signaling is especially attractive because a change in modulation format can be easily implemented, as discussed below, and hence the hypothetical transceiver can form part of an integrated opto-electronic module, ideally exhibiting low complexity and power consumption.…”

Section: Introductionmentioning

confidence: 99%

Systematic Performance Comparison of (Duobinary)-PAM-2,4 Signaling under Light and Strong Opto-Electronic Bandwidth Conditions

et al. 2021

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We present a systematic comparison of PAM-2 (NRZ), Duobinary-PAM-2, PAM-4, and Duobinary-PAM-4 (duo-quaternary) signaling in the context of short-reach photonic communications systems using a Mach–Zehnder modulator as transmitter. The effect on system performance with a relaxed and constrained system’s opto-electronic bandwidth is analyzed for bit rates ranging from 20 to 116 Gb/s. In contrast to previous analyses, our approach employs the same experimental and simulation conditions for all modulation formats. Consequently, we were able to confidently determine the performance limits of each format for particular values of bit rate, system bandwidth, transmitter chirp, and fiber dispersion. We demonstrate that Duobinary-PAM-4 is a good signaling choice only for bandwidth-limited systems operating at relatively high speed. Otherwise, PAM-4 represents a more sensible choice. Moreover, our analysis put forward the existence of transition points: specific bit rate values where the BER versus bit rate curves for two different formats cross each other. They indicate the bit rate values where, for specific system conditions, switching from one modulation to another guarantees optimum performance. Their existence naturally led to the proposal of a format-selective transceiver, a component that, according to network conditions, operates with the most adequate modulation format. Since all analyzed modulations share similar implementation details, signaling switching is achieved by simply changing the sampling point and threshold count at the receiver, bringing flexibility to IM/DD-based optical networks.

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“…To meet the demand for multiple applications, DSP supports multi-rate and multi-modulation formats. For example, in [1] and [2], DSP applicationspecific integrated circuits (ASICs) could treat ∼32-GBaud polarization-division multiplexed (PDM) quadrature amplitude modulation (QAM) formats with the modulation orders of 4, 8, and 16 for 100, 150, and 200 Gb/s/carrier, respectively. In addition, up to 600-Gb/s/carrier transmission experiments have recently been reported with real-time Manuscript received January 7, 2020.…”

Section: Introductionmentioning

confidence: 99%

Dual-Carrier 1-Tb/s Transmission Over Field-Deployed G.654.E Fiber Link Using Real-Time Transponder

Hamaoka

Sasai

Saito

et al. 2020

IEICE Trans. Commun.

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We demonstrated 1-Tb/s-class transmissions of fielddeployed large-core low-loss fiber links, which is compliant with ITU-T G.654.E, using our newly developed real-time transponder consisting of a state-of-the-art 16-nm complementary metal-oxide-semiconductor (CMOS) based digital signal processing application-specific integrated circuit (DSP-ASIC) and an indium phosphide (InP) based high-bandwidth coherent driver modulator (HB-CDM). In this field experiment, we have achieved record transmission distances of 1122 km for net data-rate 1-Tb/s transmission with dual polarization-division multiplexed (PDM) 32 quadrature amplitude modulation (QAM) signals, and of 336.6 km for net data-rate 1.2-Tb/s transmission with dual PDM-64QAM signals. This is the first demonstration of applying hybrid erbium-doped fiber amplifier (EDFA) and backward-distributed Raman amplifier were applied to terrestrial G.654.E fiber links. We also confirmed the stability of signal performance over field fiber transmission in wavelength division multiplexed (WDM) condition. The Q-factor fluctuations respectively were only less than or equal to 0.052 dB and 0.07 dB for PDM-32QAM and PDM-64QAM signals within continuous measurements for 60 minutes.

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Multi-Rate Multi-Format CFP/CFP2 Digital Coherent Interfaces for Data Center Interconnects, Metro, and Long-Haul Optical Communications

Cited by 26 publications

References 15 publications

Coherent Optical Transceivers Scaling and Integration Challenges

Coherent Optical Transceivers Scaling and Integration Challenges

Systematic Performance Comparison of (Duobinary)-PAM-2,4 Signaling under Light and Strong Opto-Electronic Bandwidth Conditions

Dual-Carrier 1-Tb/s Transmission Over Field-Deployed G.654.E Fiber Link Using Real-Time Transponder

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