Broad-Range tunable optical wavelength converter for next generation optical superchannels
01 Nov 2015-Dyna (Universidad Nacional de Colombia, Facultad de Minas, Centro de Publicaciones)-Vol. 82, Iss: 194, pp 72-78
TL;DR: In this paper, a broad-range tunable all optical wavelength conversion scheme that is based on a dual driven Mach-Zehnder modulator with an integrated microwave generator to tune the channel spacing along the entire C band, is proposed.
Abstract: A broad-range tunable all optical wavelength conversion scheme that is based on a dual driven Mach-Zehnder modulator with an integrated microwave generator to tune the channel spacing along the entire C band, is proposed. Successful signal demodulation up to 8 wavelength conversions, in steps of 50-400 GHz of 100 Gbps Nyquist QPSK channels with configurable channel spacing is reported. The proposed wavelength conversion scheme enables flexible wavelength routing on gridless optical networks, as can be seen in the Superchannels with a BER lower than 10-13.
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Proceedings Article•
01 Jan 2012
TL;DR: In this article, the authors demonstrate 40Gb/s operation without bit loss of an all-optical selective wavelength shifter in a SOA-MZI enabling simultaneous wavelength-conversion and data erasing of data burst under a gate signal.
Abstract: We demonstrate 40Gb/s operation without bit loss of an all-optical selective wavelength-shifter in a SOA-MZI enabling simultaneous wavelength-conversion and data erasing of data burst under a gate signal.
References
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TL;DR: The drivers, building blocks, architecture, and enabling technologies for a whole new elastic optical networking paradigm are described, as well as early standardization efforts.
Abstract: Optical networks are undergoing significant changes, fueled by the exponential growth of traffic due to multimedia services and by the increased uncertainty in predicting the sources of this traffic due to the ever changing models of content providers over the Internet. The change has already begun: simple on-off modulation of signals, which was adequate for bit rates up to 10 Gb/s, has given way to much more sophisticated modulation schemes for 100 Gb/s and beyond. The next bottleneck is the 10-year-old division of the optical spectrum into a fixed "wavelength grid," which will no longer work for 400 Gb/s and above, heralding the need for a more flexible grid. Once both transceivers and switches become flexible, a whole new elastic optical networking paradigm is born. In this article we describe the drivers, building blocks, architecture, and enabling technologies for this new paradigm, as well as early standardization efforts.
1,448 citations
TL;DR: In this article, the performance of Nyquist-WDM Terabit superchannels implemented using polarization-multiplexed phase shift-keying based on 2 (PM-BPSK) and 4 (PM)-QPSK signal points was investigated through simulations.
Abstract: We investigated through simulations the performance of Nyquist-WDM Terabit superchannels implemented using polarization-multiplexed phase shift-keying based on 2 (PM-BPSK) and 4 (PM-QPSK) signal points or polarization-multiplexed quadrature amplitude modulation based on 8 (PM-8QAM) and 16 (PM-16QAM) signal points. Terabit superchannels are obtained through the aggregation of multiple subcarriers using the Nyquist-WDM technique, based on a tight spectral shaping of each subcarrier which allows very narrow spacing. We first studied the optimum transmitter/receiver filtering in a back-to-back configuration. Then we investigated the maximum reach for different spectral efficiencies, after nonlinear propagation over uncompensated links with lumped amplification. Performance for systems based on both standard single-mode fiber (SSMF) and large effective area non-zero dispersion-shifted fiber (NZDSF) has been analyzed. Assuming SSMF with 25-dB span loss, we found that PM-BPSK can reach 6480 km at a net capacity of 4 Tb/s across the C band. Conversely, PM-16QAM can deliver 27 Tb/s, but over 270 km only. Note that a lower span length, the use of Raman amplification and/or pure silica-core fibers (PSCFs) can significantly increase the maximum reach, but without changing the hierarchy among the performance of modulation formats. We also show that the maximum reachable distance is approximately 2/3 of the one achievable in linear propagation at the optimum launch power, regardless of the modulation format, spacing and fiber type. As additional results, we also verified that the optimum launch power per subcarrier linearly depends on the span loss, varies with the fiber type, but it is independent of the modulation format, and that the relationship between the maximum reachable distance and the span loss is almost linear.
545 citations
"Broad-Range tunable optical wavelen..." refers background in this paper
...Every subcarrier is modulated with advanced modulation formats that can be reconfigured according to the underlying demand on the network [1-4]....
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TL;DR: In this article, the authors evaluate the tradeoff in optical slice linewidth between signal-to-excess optical noise ratio and dispersion penalty in spectrum-sliced WDM systems and determine the channel slicewidth that minimizes transmission penalty.
Abstract: We simulate transmission of a spectrum-sliced WDM channel operating at high bit rates (e.g., 622 to 2488 Mb/s). We calculate the bit error rate using the non-Gaussian statistics of thermal light sources that are commonly used in spectrum slicing and account for the effects of fiber dispersion. We evaluate the tradeoff in optical slice linewidth between signal-to-excess optical noise ratio and dispersion penalty in spectrum-sliced WDM systems, and determine the channel slicewidth that minimizes transmission penalty for a given link length and bit rate. We compare our simulations against the measured performance of a 1244 Mb/s channel over 20 km of fiber. The results in this paper provide useful information for the design of spectrum-sliced WDM networks.
116 citations
"Broad-Range tunable optical wavelen..." refers methods in this paper
...Among the techniques used to generate multiple optical carriers from one single source are: The spectral slicing broadband light source [12], the FWM (Four Wave Mixing) technique [13,14], the ultrashort pulses generation technique [15] and the MZMs [16]....
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TL;DR: In this paper, a simple linear receiver processing is shown to perfectly demultiplex the two transmitted streams and to perfectly compensate for group velocity dispersion (GVD) and polarization mode dispersion.
Abstract: This paper investigates optical coherent systems based on polarization multiplexing and high-order modulations such as phase-shift keying (PSK) signals and quadrature amplitude modulations (QAM). It is shown that a simple linear receiver processing is sufficient to perfectly demultiplex the two transmitted streams and to perfectly compensate for group velocity dispersion (GVD) and polarization mode dispersion (PMD). In addition, in the presence of a strong phase noise of the lasers at the transmitter and receiver, a symbol-by-symbol detector with decision feedback is able to considerably improve the receiver robustness with a limited complexity increase. We will also discuss the channel estimation and the receiver adaptivity to time-varying channel conditions as well as the problem of the frequency acquisition and tracking. Finally, a new two-dimensional (polarization/time) differential encoding rule is proposed to overcome a polarization-ambiguity problem. In the numerical results, the receiver performance will be assessed versus the receiver complexity.
95 citations
"Broad-Range tunable optical wavelen..." refers methods in this paper
...Among the optical devices that should be used for the Superchannels to function is the wavelength converter with the capability to work with a flexible spectral grid....
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...The power variations on every converted channel must be equalized and amplified in order to level all the Superchannels at the output....
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...With the increasing demand for information on the Internet, the next generation of optical high capacity telecommunication systems is expected to work with multiple sets of highly dense subcarriers in the frequency domain or “Superchannels”, which are capable of transporting information in Terabits per second....
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...The capacity that will provide the optical Superchannels also presents new challenges to design and develop the next generation of optical telecommunication systems....
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...However, these techniques require continuous wave probe lasers to perform the conversion of each wavelength in the context of the Superchannels....
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TL;DR: This paper can obtain optical frequency shift using the singnal-sideband modulator consisting of four optical phase modulators, where the frequency shift is precisely equal to that of an rf-signal fed to the modulator.
Abstract: This paper describes optical frequency comb generation using optical single-sideband modulation technique. We can obtain optical frequency shift using the singnal-sideband modulator consisting of four optical phase modulators, where the frequency shift is precisely equal to that of an rf-signal fed to the modulator. A series of optical spectral components can be generated by using an optical fiber loop having an optical single-sideband modulator.
79 citations