400 Gbit/s 256 QAM-OFDM transmission over 720 km with a 14 bit/s/Hz spectral efficiency by using high-resolution FDE

Omiya, Tatsunori; Yoshida, Masato

doi:10.1364/oe.21.002632

Cited by 51 publications

(13 citation statements)

References 9 publications

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“…Although classified as heterodyne detection and, therefore, not the focus of this paper, significant advances in the transmission of high-order QAM formats has been achieved by transmitting data with a PT obtained by frequency shifting the unmodulated carrier [42][43][44][45]. The PT is used as a phase reference to a PLL locking a tunable tracking laser used as the LO at the receiver and allows the use of both polarizations for signal data at the expense of a small increase in the required signal bandwidth.…”

Section: Other Pilot-tone Transmission Schemesmentioning

confidence: 99%

“…The PT is used as a phase reference to a PLL locking a tunable tracking laser used as the LO at the receiver and allows the use of both polarizations for signal data at the expense of a small increase in the required signal bandwidth. This scheme has allowed the transmission of signals up to 512 QAM [44], as well as 256 QAM-OFDM [45] with high spectral efficiency, but does not allow phase noise cancellation and the linewidth tolerance characteristic of the schemes described in Sections 3 and 4.…”

Section: Other Pilot-tone Transmission Schemesmentioning

confidence: 99%

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Self-Homodyne Detection in Optical Communication Systems

et al. 2014

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Abstract:We review work on self-homodyne detection (SHD) for optical communication systems. SHD uses a transmitted pilot-tone (PT), originating from the transmitter laser, to exploit phase noise cancellation at a coherent receiver and to enable transmitter linewidth tolerance and potential energy savings. We give an overview of SHD performance, outlining the key contributors to the optical signal-to-noise ratio penalty compared to equivalent intradyne systems, and summarize the advantages, differences and similarities between schemes using polarization-division multiplexed PTs (PDM-SHD) and those using space-division multiplexed PTs (SDM-SHD). For PDM-SHD, we review the extensive work on the transmission of advanced modulation formats and techniques to minimize the trade-off with spectral efficiency, as well as recent work on digital SHD, where the SHD receiver is combined with an polarization-diversity ID front-end receiver to provide both polarization and modulation format alignment. We then focus on SDM-SHD systems, describing experimental results using multi-core fibers (MCFs) with up to 19 cores, including high capacity transmission with broad-linewidth lasers and experiments incorporating SDM-SHD in networking. Additionally, we discuss the requirement for polarization tracking of the PTs at the receiver and path length alignment and review some OPEN ACCESSPhotonics 2014, 1 111 variants of SHD before outlining the future challenges of self-homodyne optical transmission and gaps in current knowledge.

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Section: Other Pilot-tone Transmission Schemesmentioning

confidence: 99%

Section: Other Pilot-tone Transmission Schemesmentioning

confidence: 99%

Self-Homodyne Detection in Optical Communication Systems

et al. 2014

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“…There is a great interest in increasing the spectral efficiency (SE) of data signals in order to achieve larger capacity within the limited bandwidth of optical amplifiers (~5 THz for typical EDFAs). Various approaches have been investigated, such as advanced modulation formats, space division multiplexing and spectrally-efficient channel multiplexing [1][2][3][4][5][6]. Nyquist WDM and orthogonal frequency division multiplexing (OFDM) have been proposed since both of these can combine multiple channels with high SE and achieve a channel spacing equal to the symbol rate.…”

Section: Introductionmentioning

confidence: 99%

320 Gb/s Nyquist OTDM received by polarization-insensitive time-domain OFT

Hu¹,

Kong²,

Palushani³

et al. 2013

Opt. Express

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Abstract:We have demonstrated the generation of a 320 Gb/s Nyquist-OTDM signal by rectangular filtering on an RZ-OTDM signal with the filter bandwidth (320 GHz) equal to the baud rate (320 Gbaud) and the reception of such a Nyquist-OTDM signal using polarization-insensitive time-domain optical Fourier transformation (TD-OFT) followed by passive filtering. After the time-to-frequency mapping in the TD-OFT, the Nyquist-OTDM signal with its characteristic sinc-shaped time-domain trace is converted into an orthogonal frequency division multiplexing (OFDM) signal with sinc-shaped spectra for each subcarrier. The subcarrier frequency spacing of the converted OFDM signal is designed to be larger than the transform-limited case, here 10 times greater than the symbol rate of each subcarrier. Therefore, only passive filtering is needed to extract the subcarriers of the converted OFDM signal. In addition, a polarization diversity scheme is used in the four-wave mixing (FWM) based TD-OFT, and less than 0.5 dB polarization sensitivity is demonstrated in the OTDM receiver. References and links1. P. J. Winzer, "High-spectral-efficiency optical modulation formats," J. Lightwave Technol. 30(24), 3824-3835 (2012 Schindler, C. Koos, W. Freude, and J. Leuthold, "512QAM Nyquist sinc-pulse transmission at 54 Gbit/s in an optical bandwidth of 3 GHz," Opt. Express 20(6), 6439-6447 (2012 (2011)

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“…Self-homodyne coherent technology [13][14][15][16][17][18][19][20][21][22] where the LO laser is transmitted together with the signal relaxes the requirements for DSP since eliminates the need for frequency offset compensation between transmitter laser and LO. Yet, for single-carrier modulation this technology sacrifices one of the two orthogonal polarizations of the fiber to fit an optical carrier that halves transmission capacity.…”

mentioning

confidence: 99%

“…Yet, for single-carrier modulation this technology sacrifices one of the two orthogonal polarizations of the fiber to fit an optical carrier that halves transmission capacity. For multicarrier schemes such as self-coherent optical orthogonal frequencydivision multiplexing (Self-CO-OFDM) [14,15,19,20,22], it typically requires a large carrier guardband (i.e. frequency gap that discards many OFDM middle subcarriers) for filtering-out the carrier that significantly limits signal capacity.…”

mentioning

confidence: 99%

Chip-based Brillouin processing for carrier recovery in self-coherent optical communications

Choudhary

Mägi

Marpaung

et al. 2018

Optica

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Modern fiber-optic coherent communications employ advanced, spectrally-efficient modulation formats that require sophisticated narrow linewidth local oscillators (LOs) and complex digital signal processing (DSP). Self-coherent optical orthogonal frequency-division multiplexing (Self-CO-OFDM) is a modern technology that retrieves the frequency and phase information from the extracted carrier without employing a LO or additional DSP. However, a wide guardband is typically required to easily filter out the optical carrier at the receiver, thus discarding many OFDM middle subcarriers that limits the system data rate. Here, we establish an optical technique for carrier recovery harnessing large-gain stimulated Brillouin scattering (SBS) on a photonic chip for up to 116.82 Gbit⋅s -1 Self-CO-OFDM signals, without requiring a separate LO. The narrow SBS linewidth allows for a record-breaking small carrier guardband of ~265 MHz in Self-CO-OFDM, resulting in higher capacity than benchmark self-coherent multi-carrier schemes. Chip-based SBS-self-coherent technology reveals comparable performance to state-of-the-art coherent optical receivers while relaxing the requirements of the DSP. In contrast to SBS processing on-fiber, our solution provides phase and polarization stability. Our demonstration develops a low-noise and frequency-preserving filter that synchronously regenerates a low-power narrowband optical tone, which could relax the requirements on very-high-order modulation signaling for future communication networks. The proposed hybrid carrier filtering-and-regeneration technique could be useful in long-baseline interferometry for precision optical timing or reconstructing a reference tone for quantum-state measurements.

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400 Gbit/s 256 QAM-OFDM transmission over 720 km with a 14 bit/s/Hz spectral efficiency by using high-resolution FDE

Cited by 51 publications

References 9 publications

Self-Homodyne Detection in Optical Communication Systems

Self-Homodyne Detection in Optical Communication Systems

320 Gb/s Nyquist OTDM received by polarization-insensitive time-domain OFT

Chip-based Brillouin processing for carrier recovery in self-coherent optical communications

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