Evaluation of Sensitivity of the Digital Coherent Receiver

Kikuchi, K.; Tsukamoto, S.

doi:10.1109/jlt.2007.913589

Cited by 121 publications

(57 citation statements)

References 12 publications

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“…The polarization alignment after detection has been made possible by introducing the polarization-diversity scheme into the homodyne receiver [12,13]. Polarization demultiplexing and compensation for PMD have also been demonstrated with the digital coherent receiver [14], where bulky and slow optical-polarization controllers as well as optical-delay lines are removed.…”

Section: Historical Backgroundmentioning

confidence: 99%

Digital coherent optical communication systems: fundamentals and future prospects

Kikuchi¹

2011

IEICE Electron. Express

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Abstract:The recently-developed digital coherent receiver enables us to employ a variety of spectrally-efficient modulation formats such as M -ary phase-shift keying (PSK) and quadrature-amplitude modulation (QAM). Moreover, in the digital domain, we can equalize linear transmission impairments, which may stem from group-velocity dispersion (GVD) and polarization-mode dispersion (PMD) of fibers for transmission, because the phase information is preserved after coherent detection.This paper reviews the history of coherent optical communications, the principle of coherent detection, and the concept of the digital coherent receiver. After that, we discuss digital signal processing (DSP) for mitigating transmission impairments, coherent transmission characteristics of multi-level optical signals, and future prospects of coherent optical communications. Keywords: coherent optical communications, multi-level modulation, homodyne detection. Classification: Fiber-optic communication Lett., vol. 16, no. 5, pp. 179-181, Feb. 1980. [4] Y. Yamamoto, "Receiver performance evaluation of various digital optical modulation-demodulation systems in the 0.5-10 μm wavelength region," IEEE J. Quantum Electron., vol. QE-16, no. 11, pp. 1251-1259, Nov. 1980 Express, vol. 16, no. 2, pp. 804-817, Jan. 2008. [15] H. Sun, K.-T. Wu, and K. Roberts, "Real-time measurements of a 40-Gb/s coherent system," Opt. Express, vol. 16, no. 2, pp. 873-879, Jan. 2008. Lightwave Technol., vol. 29, no. 4, pp. 417-425, Feb. 2011. [18] References

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Section: Historical Backgroundmentioning

confidence: 99%

Digital coherent optical communication systems: fundamentals and future prospects

Kikuchi¹

2011

IEICE Electron. Express

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“…The OFDM signals (400 symbols each of 20.48 ns length, 2% cyclic prefix) encoded with QPSK modulation format were generated offline in MATLAB using an IFFT size of 512, where 210 subcarriers were filled with data and the remainder zeros giving a potential line rate of 20 Gb/s per channel. The DSP at the receiver included combining x-and y-polarizations using the maxima-ratio combining method [9], frequency offset compensation, chromatic dispersion compensation using a frequency domain equalizer (overlap-and-save method), channel estimation and equalization with the assistance of initial training sequence (2 training symbols every 100 symbols), common phase error (CPE) compensation by distributing 8 pilots uniformly across the OFDM band [10], giving a net data rate of 17.4 Gbit/s. Figure 2 shows the histograms of in-phase and quadrature components of the received QPSK signal for the center channel.…”

Section: Experimental Setup and Resultsmentioning

confidence: 99%

Comparison of Bit Error Rate Estimation Methods for QPSK CO-OFDM Transmission

McCarthy

Suibhne

et al. 2014

IEEE Photon. Technol. Lett.

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Son Thai Le et al., IEEE PTL, 2014 1  Abstract-In this letter, we experimentally study the statistical properties of a received QPSK modulated signal and compare various bit error rate (BER) estimation methods for coherent optical orthogonal frequency division multiplexing (CO-OFDM) transmission. We show that the statistical BER estimation method based on the probability density function of the received QPSK symbols offers the most accurate estimate of the system performance.Index Terms-Bit error rate, coherent detection, coherent optical transmission, orthogonal frequency division multiplexing.

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“…Ref. [26] transmits an optical packet header with only one polarization tributary and hence the SOP can be estimated with the algorithm proposed in [27]. However, this requires a more complex transmitter capable of nullifying one of the signal polarizations and additionally the lower energy in the packet header will impair the packet detection process due to additional noise compared to having a PDM header.…”

Section: Coherent Burst-mode Receivers For Pdm-qpsk and Pdm-16qam Modmentioning

confidence: 99%

Ultra-High-Capacity Optical Packet Switching Networks with Coherent Polarization Division Multiplexing QPSK/16QAM Modulation Formats

et al. 2017

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Abstract:Optical packet switching (OPS) networks and its subsystems, like the burst-mode receiver, are an essential technology currently used in passive optical networks (PONs). Moreover, OPS may play a fundamental role on future hybrid optical circuit switching (OCS)/OPS networks and datacenter networks. This paper focuses on two fundamental subsystems of packetized optical networks: the digital coherent burst-mode receiver and the electro-optical switch. We describe and experimentally characterize a novel digital coherent burst-mode receiver that makes uses of the Stokes parametrization to rapidly estimate the state of polarization (SOP) and optimize the equalizer convergence time. This burst-mode receiver is suitable for optical packetized networks that make use of advanced modulation formats such as quadrature amplitude modulation (QAM). We study the suitability of (Pb,La)(Zr,La)O 3 (PLZT) optical switches for amplitude-variable coherent polarization division multiplexing (PDM) 16QAM modulation format and demonstrate a switching capacity of 10.24 Tb/s/port. We demonstrate a full 2 × 2 OPS node with a control plane capable of solving packet contention by means of packet dropping or buffering with a switching capacity of 10.24 Tb/s/port. Finally, we demonstrate the operation of the 2 × 2 OPS node with a record capacity of 12.8 Tb/s/port plus 100 km of dispersion-compensated fiber transmission.

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Evaluation of Sensitivity of the Digital Coherent Receiver

Cited by 121 publications

References 12 publications

Digital coherent optical communication systems: fundamentals and future prospects

Digital coherent optical communication systems: fundamentals and future prospects

Comparison of Bit Error Rate Estimation Methods for QPSK CO-OFDM Transmission

Ultra-High-Capacity Optical Packet Switching Networks with Coherent Polarization Division Multiplexing QPSK/16QAM Modulation Formats

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