by Xingwen Yi, William Shieh, Yiran Ma - doi: 10.1049/iet-opt.2008.0059. 2010 at 16:52 from IEEE Xplore. Limitations apply
". Abstract—There are three major advantages of coherent op-tical orthogonal frequency-division multiplexing (CO-OFDM) transmission using digital signal processing. First, coherent detec-tion is recognized by digital phase estimation without resorting to optical phase-locked loop. Second, OFDM modulatio. "
Abstract—There are three major advantages of coherent op-tical orthogonal frequency-division multiplexing (CO-OFDM) transmission using digital signal processing. First, coherent detec-tion is recognized by digital phase estimation without resorting to optical phase-locked loop. Second, OFDM modulation and demod-ulation are recognized through the well-established computation-efficient fast Fourier transform (FFT) and inverse FFT. Third, adaptive data rates could be supported as different quadrature amplitude modulation (QAM) constellations are software-defined, with no hardware alternation in transmitter and receiver. However, it's well-known that coherent recognition, OFDM, and QAM are prone to phase noise. Within this paper, theoretical, statistical, and experimental investigations are transported out for phase noise effects on high spectral efficiency CO-OFDM transmission. A transmission model in the existence of phase noise is presented. By utilizing simulation, the part error rate floors from finite laser linewidth are presented for CO-OFDM systems rich in-order QAM constellations. Within the experiments, the phase noise effects from both laser linewidth and nonlinear fiber transmission are investigated. The fiber nonlinearity minimization according to receiver digital signal processing can also be discussed. Index Terms—Coherent communication, common phase error (CPE), dispersion, intercarrier interference (ICI), intersymbol interference (ISI), optical fiber communication, orthogonal frequency-division multiplexing (OFDM), phase estimation, phase noise, quadrature amplitude modulation (QAM), signal processing. I.
l prone to phase noise. Before this work, the discussions of phase noise on coherent recognition and QAM are centered on single-carrier optical transmission systems and many of them are suitable for OPLL =-=[14]-=-, [15]. Phase noise on OFDM is principally poor wireless transmissions [16]–[19]. Therefore, it's of curiosity to research phase noise on CO-QAM-OFDM transmissions. This paper is orga.
by Herwin Chan, Andres I. Vila Casado, Student Member, Juthika Basak, Miguel Griot, Student Member, Wen-yen Weng, Richard Wesel, Senior Member, Braham Jalali, Eli Yablonovitch, Ingrid Verbauwhede, Senior Member - Within the Student Design Contest organized jointly through the 2006 ACM Design Automation Conference and also the 2006 IEEE Worldwide Solid-Condition Circuits Conference
". Abstract—Though it promises high bandwidths, the optical medium isn't popular in neighborhood systems. It is because current optical systems don't offer the simplicity and setup that the uncoordinated multiple access network for example Ethernet offers. Within this paper, we advise a manuscript nonlinear tr. "
Abstract—Though it promises high bandwidths, the optical medium isn't popular in neighborhood systems. It is because current optical systems don't offer the simplicity and setup that the uncoordinated multiple access network for example Ethernet offers. Within this paper, we advise a manuscript nonlinear trellis code created for multiple access among uncoordinated nodes within an optical communications system. This code continues to be proven with an efficiency of 30%. We've implemented the codes on Xilinx FPGA’s for any 6 user optical system, transmitting data on one wave length. The above mentioned system was setup using commercial off-the-shelf components so we shown BER of lt 1009 for 3 users, each running in a funnel rate of two Gbps. Illustration showing this technique needed the style of new funnel codes, architectural optimizations for that implementation from the funnel codes for top speed with limited sources and electrical/optical optimizations to understand the optical funnel. Index Terms—High-speed architectures, multiple access network, nonlinear trellis code, optical network, uncoordinated access network. I.
or, which is actually an intensity (not amplitude) detector, and works as a mixer for that six optical signals. Because they are oscillators, lasers contain some phase noise around its carrier frequency =-=[10]-=-. Due to this property, there's an opportunity that 2 lasers being within
.03 nm (4 GHz when focused on 1550 nm), mixing in the photodetector would increase the risk for phase noise connected using the.
by Mihajlo Stefanovi, Dragana Krsti, Dragana Petrovi, Nataa Kapacinovi
". Abstract. Within this paper the receiver for that demodulation of M-FSK signals in the existence of Gaussian noise, impulse noise and variable signal amplitude is recognized as. The communication systems are susceptible to Gaussian noise, impulse noise and Rayleigh signal amplitude that may seriously degrade the. "
Abstract. Within this paper the receiver for that demodulation of M-FSK signals in the existence of Gaussian noise, impulse noise and variable signal amplitude is recognized as. The communication systems are susceptible to Gaussian noise, impulse noise and Rayleigh signal amplitude that may seriously degrade their performance. 1.
erent demodulation of M-ary FSK signals in the existence of Gaussian noise, impulse noise and variable signal amplitude. These annoyances can seriously degrade the performance of communication systems =-=[1]-=--[3]. Within the paper [4], the performance look at several kinds of FSK and CPFSK receivers was investigated at length while using modified moment’s method. Also, the mistake possibility of the mix-c.
by Francesco Vacondio, Rsum Mire
". On the advantages of phase shift keying to optical telecommunication systems. Thse prsente la Facult plusieurs tudes suprieures de l’Universit Laval dans le cadre du programme de doctorat en gnie lectrique pour l’obtention du grade de Philosophi Physician (Ph.D.) Facult plusieurs sciences et de gnie United nations. "
On the advantages of phase shift keying to optical telecommunication systems. Thse prsente la Facult plusieurs tudes suprieures de l’Universit Laval dans le cadre du programme de doctorat en gnie lectrique pour l’obtention du grade de Philosophi Physician (Ph.D.) Facult plusieurs sciences et de gnie UNIVERSIT LAVAL
performance of the coherent system. Within this section we provide a brief summary of coherent recognition. We'll discuss the initial concepts behind optical coherent reception, dating back the 1980s =-=[55, 56]-=-. We'll explain the elevated curiosity about coherent reception recently. 1.3.1 Coherent reception Figure 1.20 sketches the essential distinction between (a) direct, (b) differential, and (c) coh.
by unknown authors. 2015
Abstract not found
ch that it is slow and fast axes are precisely aligned using the two possible SOPs emerging in the EO modulator. It established fact that, due to its highly uneven structure or refractive-index =-=[12]-=-, PMSM fiber enables guiding two Fig. 4. Receiver from the hybrid DQPSK–MPPM technique a Fig. 3. Receiver from the hybrid DBPSK–MPPM technique aprincipal SOP of monochromatic light at strict timing and pha.
by Dragana Krstic, Mihajlo Stefanovic, Natasa Kapacinovic, Srdjan Jovkovic, Dusan Stefanovic, Dragana Krsti, Mihajlo Stefanovi, Nataa Kapacinovi, Srdjan Jovkovi, Duan Stefanovi
". Abstract:- Within this paper the receiver for that demodulation of M-FSK signals in the existence of Gaussian noise, intersymbol interference, impulse interference and fading is recognized as. The probability density purpose of M-ary FSK signal in the existence of noise, interference and fading comes. T. "
Abstract:- Within this paper the receiver for that demodulation of M-FSK signals in the existence of Gaussian noise, intersymbol interference, impulse interference and fading is recognized as. The probability density purpose of M-ary FSK signal in the existence of noise, interference and fading comes. These interferences can seriously degrade the communication system performances.
ing demodulation of M-ary FSK signals in the existence of Gaussian noise, impulse noise and variable signal amplitude. These disturbances can seriously degrade the performance of communication systems =-=[1]-=--[3]. Within the paper [4], the performance look at several kinds of FSK and CPFSK receivers was investigated at length while using modified moment’s method. Also, the mistake possibility of the crossco.
". Coherent recognition employing multilevel modulation formats is becoming probably the most promising technologies for next-gen high-speed transmission systems because of the high power and spectral efficiencies. While using effective digital signal processing (DSP), coherent optical receivers permit the s. "
Coherent recognition employing multilevel modulation formats is becoming probably the most promising technologies for next-gen high-speed transmission systems because of the high power and spectral efficiencies. While using effective digital signal processing (DSP), coherent optical receivers permit the significant equalization of chromatic dispersion (CD), polarization mode dispersion (PMD), phase noise (PN) and nonlinear effects within the electrical domain. Lately, the realizations of those DSP algorithms for mitigating the funnel distortions within the coherent transmission systems are the best looking investigations. The CD equalization can be carried out through the digital filters coded in time and also the frequency domain, which could suppress the fiber dispersion effectively. The PMD compensation is generally performed within the time domain using the adaptive least mean square (LMS) and constant modulus algorithms (CMA) equalization. Feed-forward and feed-back carrier phase estimation (CPE) algorithms are widely-used to mitigate the
].s1.2.2 Good reputation for coherent optical communicationssDue towards the high sensitivity from the receivers, coherent optical transmission systemss4swere investigated extensively within the eighties of 20th century =-=[18,19]-=-. However, thesdevelopment from the coherent technologies continues to be delayed for pretty much two decades aftersthat period [20-22]. Until 2005, the coherent transmission techniques attracted thesinterests of inve.
by M Arumugam. 2001
". Abstract. This paper handles the historic growth and development of optical communication systems as well as their failures initially. Then your different generations in optical fiber communication with their features are discussed. Some facets of total internal reflection, various kinds of fibers along. "
Abstract. This paper handles the historic growth and development of optical communication systems as well as their failures initially. Then your different generations in optical fiber communication with their features are discussed. Some facets of total internal reflection, various kinds of fibers with their size and refractive index profile, dispersion and loss mechanisms will also be pointed out. Finally the overall system of optical fiber communication is briefly pointed out and its advantages and limitations. Future soliton based optical fiber communication can also be highlighted.
r. During the center of the 20th century, it had been recognized that the increase of countless orders of magnitude of bit rate distance product could be possible if optical waves were utilised because the carrier =-=[1]-=-. Table 1 shows the various communication systems as well as their bit rate distance product. Here the repeater spacing is pointed out as distance. Within the old optical communication system, the part rate dista.
by Roberto Cusani, Enzo Baccarelli, Stefano Galli. 1997
". A brand new procedure is suggested for estimating the Condition-of-Polarisation from the received optical signal in Four- Quadrature Amplitude Modulation systems. The suggested solution, that is acquired based on the utmost Likelihood qualifying criterion, is just electronic and are operating in the existence of lase. "
A brand new procedure is suggested for estimating the Condition-of-Polarisation from the received optical signal in Four- Quadrature Amplitude Modulation systems. The suggested solution, that is acquired based on the utmost Likelihood qualifying criterion, is just electronic and are operating in the existence of laser phase noise, photodetection noise and crosspolarisation interference. It employs a suitably designed training sequence to estimate Jonesapos parameters within the data-aided training mode. An effective decision-directed procedure will be activated to lock-within the believed parameters within the operative mode. The variances from the resulting estimation errors are evaluated and also the overall system performance is offered when it comes to Bit Error Probability versus signal-to-noise ratio. The theoretical analysis and also the computer simulations show the brilliance from the suggested recovery procedure regarding alternative solutions lately suggested in literature.
their SOP, thus resulting in fluctuations from the received SOP these fluctuations are usually very slow and vary as time passes constants of countless seconds or hrs, with respect to the entire fiber =-=[15]. -=-A simple method of describing the electrical field in the output of merely one mode fiber would be to consider Jones’ matrix (JM), so the r r received electrical field is Er() t = J Et() t. where J.
by Arun Gangwar, Bhawana Sharma
". Abstract:- This paper handles the Fundamental communication model and the kinds of fibers for that optical fiber communication system. Then your different technologies in optical fiber communication with their features are discussed briefly. Some comparisons of optical signals using the traditional. "
Abstract:- This paper handles the Fundamental communication model and the kinds of fibers for that optical fiber communication system. Then your different technologies in optical fiber communication with their features are discussed briefly. Some comparisons of optical signals using the traditional electrical signals are described concisely. Finally the overall system of optical fiber communication is briefly pointed out and its advantages and limitations. The long run facets of the Optical Fiber can also be implies that the way the new technology could be overcome the shortcomings from the old one.
