Unrepeated transmission of 20-Gb/s optical quadrature phase-shift-keying signal over 200-km standard single-mode fiber based on digital processing of homodyne-detected signal for Group-velocity dispersion compensation

Tsukamoto, S.; Katoh, Kazuhiro; Kikuchi, K.

doi:10.1109/lpt.2006.873501

Cited by 71 publications

(25 citation statements)

References 9 publications

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“…While the spectral efficiency of the binary modulation format is restricted to the Nyquist limit of 1 bit/s/Hz/polarization, multi-level modulation formats can improve this value. The more important advantage of the digital coherent receiver is the post signal-processing function [10,11]. The demodulation process by the digital coherent receiver is entirely linear; therefore, all of the information on the complex amplitude of the transmitted optical signal is preserved even after detection; and thus, signal processing such as GVD compensation can be performed in the digital domain.…”

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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“…4(c)). Therefore, the impulse responses of the traveling-wave electrode EOM with polarization-reversed structures are obtained by simple digital-like shape functions corresponding to the polarization-reversed patterns themselves [6]. The temporal scale ∆t in the impulse response is proportional to the spatial length ∆L of the electrode.…”

Section: Design Of the Pre-equalization Modulatormentioning

confidence: 99%

Pre-Equalizing Electro-Optic Modulator Utilizing Polarization-Reversed Ferro-Electric Crystal Substrate

Murata

Ohno

Mitsubo

et al. 2018

IEICE Trans. Electron.

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SUMMARYWe have proposed and developed new electro-optic modulators for the pre-equalization of signal distortion caused by the optical fiber chromatic dispersion effect. We found that the synthesis of an almost arbitrary impulse response function is obtainable by utilizing an electro-optic modulator composed of a Mach-Zehnder waveguide and travelling-wave electrodes on a ferro-electric material substrate with polarization-reversed structures. In this paper, the operational principle, design and simulation results of the pre-equalization modulator are presented. Some preliminary experimental results are also shown with future prospects.

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“…On the other hand, the recent progress of digital-coherent detection is tremendous [7]. Carrier phase estimation (CPE) which tracks phase noise of received signal for homodyne detection [8] and compensation of linear distortion caused by transmission over optical fibers [9] are achieved stably in a digital domain, which enables long reach transmission at a high data rate. It is important to clarify the effectiveness of such a powerful digital-coherent detection in PSK Y-00 signal transmission.…”

Section: Introductionmentioning

confidence: 99%

Digital feedforward carrier phase estimation for PSK Y-00 quantum-noise randomized stream cipher

2018

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Encryption in fiber-optic transmission is one of remaining issues in modern communication systems. One of the solutions is to use Y-00 quantum-noise randomized stream cipher. In this paper, we propose feedforward carrier phase estimation (CPE) with Y-00 decryption process for digital-coherent detection of phase-shift keying (PSK) Y-00 signal. After decryption of Y-00 signal in a digital domain, carrier phase is estimated by calculating Mth power of signal complex amplitude. Numerical simulations for 10-Gbaud PSK Y-00 signal show that the feedforward CPE with decryption process, which is used by a legitimate receiver who shares keys, successfully tracks phase noise. Consequently, penalty-less demodulation of Y-00 signal is achieved. , vol. 21, no. 19, pp. 867-868, 1985, vol. 21, no. 19, pp. 867-868, . DOI:10.1049 K. Kikuchi, T. Okoshi, M. Nagamatsu, and N. Henmi, "Degradation of biterror rate in coherent optical communications due to spectral spread of the transmitter and the local oscillator,"

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Unrepeated transmission of 20-Gb/s optical quadrature phase-shift-keying signal over 200-km standard single-mode fiber based on digital processing of homodyne-detected signal for Group-velocity dispersion compensation

Cited by 71 publications

References 9 publications

Digital coherent optical communication systems: fundamentals and future prospects

Digital coherent optical communication systems: fundamentals and future prospects

Pre-Equalizing Electro-Optic Modulator Utilizing Polarization-Reversed Ferro-Electric Crystal Substrate

Digital feedforward carrier phase estimation for PSK Y-00 quantum-noise randomized stream cipher

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