Topic
Wavelength-division multiplexing
About: Wavelength-division multiplexing is a research topic. Over the lifetime, 25059 publications have been published within this topic receiving 332027 citations. The topic is also known as: WDM.
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TL;DR: It is demonstrated that even under strong nonlinear distortion the transmission reach only reduces by a factor of ~2.5 for a 2 unit increase in capacity when full band DBP is employed, in proportion to the required back-to-back OSNR.
Abstract: We report the performance of coherently-detected nine-channel WDM transmission over high dispersion fibers, using polarization multiplexed m-ary quadrature amplitude modulation (m = 4, 16, 64, 256) at 112 Gbit/s. Compensation of fiber nonlinearities via digital back-propagation enables up to 10 dB improvement in maximum transmittable power and similar to 8 dB Q(eff) improvement which translates to a nine-fold enhancement in transmission reach for PM-256QAM, where the largest improvements are associated with higher-order modulation formats. We further demonstrate that even under strong nonlinear distortion the transmission reach only reduces by a factor of similar to 2.5 for a 2 unit increase in capacity (log(2)m) when full band DBP is employed, in proportion to the required back-to-back OSNR.
94 citations
Patent•
25 Jun 1984TL;DR: In this article, a waveguide resonator was adapted to be evanescently coupled to an optical waveguide (F) and optically coupled to the photodetector (500) wherein the resonator is tunable.
Abstract: Optical device (T1) comprising a waveguide resonator (10), a photodetector (500) and the resonator is adapted to be evanescently coupled to an optical waveguide (F) and optically coupled to the photodetector (500) wherein the resonator is tunable. The device further comprises an intracavity element (50) optically coupled to the resonator, a control circuit element (100 arranged to tune the resonator and further comprising either a receiver (300) or an optical gain element (200). The optical gain device may be located on a loop or interconnecting two loops.
94 citations
17 Mar 2002
TL;DR: In this paper, a novel optical orthogonal frequency division multiplexing (OFDM) technique was proposed, which can overcome the spectral efficiency limitation of the conventional WDM system up to 1 bit/s/Hz in principle.
Abstract: Summary form only given. We have proposed a novel optical orthogonal frequency division multiplexing technique that can overcome the spectral efficiency limitation of the conventional WDM system. This scheme permits substantial overlapping of the spectrum and can achieve the spectral efficiency up to 1 bit/s/Hz in principle. For demultiplexing, we used a newly developed optical discrete Fourier transformer (DFT) instead of electrical digital processing, which is impossible to apply in the optical frequency range. The optical DFT was realized by using a set of delay lines, a phase shifter and a coupler in the frequency domain and bit synchronization and an optical gate in the time domain. In experimental demonstration of this scheme, error-free operation was obtained with a 0.8 bit/s/Hz of spectral efficiency.
94 citations
TL;DR: In this article, the statistics of the eye-closure due to four-wave mixing (FWM) in the presence of arbitrary data values and optical phases in all WDM channels were evaluated.
Abstract: For wavelength division multiplexing (WDM) systems over nonzero dispersion fiber, we evaluate the statistics of the eye-closure due to four-wave mixing (FWM) in the presence of arbitrary data values and optical phases in all WDM channels. By Monte Carlo (MC) experiments, we determine the distribution function and the standard deviation of the eye-closure for several channel counts. Convolution of the distribution after a single span yields the eye-closure distribution after multiple amplified spans. The results are used to assess the Q-factor penalty in a WDM system. The limits for optical power, chromatic dispersion and channel spacing can then be found. It is shown that the power of the FWM products can be used to estimate the system penalty due to FWM. When comparing standard single-mode fiber with nonzero dispersion-shifted fiber (NZDSF), we find that standard fiber allows for a triple narrower channel spacing than NZDSF, given the same set of system parameters.
94 citations
TL;DR: A novel hybrid time-frequency adaptive equalization algorithm based on a combination of frequency domain equalization (FDE) and decision-directed least mean square (DD-LMS) is proposed and experimentally demonstrated in a Nyquist single carrier visible light communication (VLC) system.
Abstract: In this paper, a novel hybrid time-frequency adaptive equalization algorithm based on a combination of frequency domain equalization (FDE) and decision-directed least mean square (DD-LMS) is proposed and experimentally demonstrated in a Nyquist single carrier visible light communication (VLC) system. Adopting this scheme, as well with 512-ary quadrature amplitude modulation (512-QAM) and wavelength multiplexing division (WDM), an aggregate data rate of 4.22-Gb/s is successfully achieved employing a single commercially available red-green-blue (RGB) light emitting diode (LED) with low bandwidth. The measured Q-factors for 3 wavelength channels are all above the Q-limit. To the best of our knowledge, this is the highest data rate ever achieved by employing a commercially available RGB-LED.
94 citations