Download or read book Synthesis and Regeneration of Advanced Optical Modulation Formats written by Liam Mykel Jones and published by . This book was released on 2016 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Synthesis and Regeneration of Advanced Optical Modulation Formats written by Liam Jones and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Advanced Optical Modulation Formats in High speed Lightwave System written by Sen Zhang and published by . This book was released on 2004 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Mitigation of Nonlinear Impairments for Advanced Optical Modulation Formats written by Carsten Behrens and published by . This book was released on 2012 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Mitigation of Nonlinear Impairments for Advanced Optical Modulation Formats written by C. Behrens and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Optical fibre networks form the backbone of the global communication infrastructure but are currently experiencing an unprecedented level of stress due to more and more bandwidth-hungry applications. In an effort to address this and avoid a so-called capacity crunch, research groups around the world have focused their attention on more spectrally-efficient modulation formats, to increase available capacity at a competitive cost. However, the drive towards higher- order modulation formats leads to greater transmission impairments, reducing the maximum distance over which increased capacity can be provided. The thesis describes the research work carried out to investigate the achievable transmission distances when using higher order modulation formats together with digital backpropagation (DBP). DBP is a digital signal processing (DSP) algorithm, capable of compensating for deterministic nonlinear impairments by inverting the fibre channel. Single-channel and wavelength-division-multiplexed (WDM) transmission has been investigated in experiment and simulation for a variety of polarisation-division-multiplexed (PDM) modulation formats: binary-phase-shift-keying (PDM-BPSK), quadrature-phase-shift-keying (PDM-QPSK), 8-phase-shift-keying (PDM-8PSK), 8-quadrature amplitude modulation (PDM-8QAM), 16-quadrature amplitude modulation (PDM-16QAM) and polarisation-switched QPSK (PS-QPSK). Record transmission distances were achieved in WDM transmission experiments with PDM-BPSK, PS-QPSK and PDM-QPSK at 42.9Gbit/s as well as for PDM-8PSK and PDM-8QAM at 112Gbit/s, over the most common fibre type: standard single mode fibre (SSMF) and the most common amplification solution: erbium doped fibre amplifiers (EDFA). For the first time, nonlinear compensation has been compared experimentally for different modulation formats and a fixed-complexity DBP algorithm. Its use led to increased benefit for more spectrally efficient modulation formats. Computer simulations were used to explore the upper bounds of achievable performance improvement with DBP, using an algorithm with unconstrained complexity. Furthermore, DBP was investigated for varying symbol rates and channel spacings to investigate trade-offs with respect to the digital receiver bandwidth. It was shown that even though DBP is computationally expensive, it can achieve significant improvements in transmission reach and BER performance. The results presented in this thesis, can be applied to the design of future optical transmission systems.

Download or read book Advanced Optical Modulation Formats for Fiber to the Premise written by Jamie D. Gaudette and published by . This book was released on 2007 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt: In conventional fiber to the premises (FTTp) networks, bi-directional crosstalk is an issue, as on-off keying (OOK) is used for both the upstream and downstream modulation format. Since the data in an OSBM signal resides in an offset sideband, by using OSBM as the downstream modulation format, issues pertaining to bi-directional crosstalk in a simple direct detection transceiver can be virtually eliminated by appropriate filtering in the electrical domain. This theory is applied using an inline transceiver, which is a very simple next generation FTTp transceiver. OSBM is shown to alleviate issues pertaining to bi-directional crosstalk in the FTTp system with the inline transceiver.

Download or read book Advance Modulation and Multiplexing in Optical Communication Systems written by Amin Malekmohammadi and published by LAP Lambert Academic Publishing. This book was released on 2010-12 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advanced optical modulation and multiplexing techniques have become a key ingredient to the design of modern WDM optically routed networks. This book, reviews the generation and detection of multigigabit/second intensity- and phase modulated formats and highlights their resilience to key impairments found in optical networking, such as optical amplifier noise, chromatic dispersion, WDM crosstalk and fiber nonlinearity. A novel multiplexing technique, namely Absolute Polar Duty Cycle Division Multiplexing (AP-DCDM) which is based on the polar signaling and different return to zero (RZ) duty cycles is reported for high speed optical fiber communication systems. Unlike all the other techniques, in AP-DCDM different users share the communication medium to transmit in the same time period and at the same carrier wavelength, but with different duty cycles. The unique duty cycle for each channel helps to regenerate data at the receiver

Download or read book High Speed Optical Modulation Advanced Modulation Formats and Mode Division Multiplexing in Silicon Photonics written by Diego Pérez Galacho and published by . This book was released on 2016 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Bandwidth demand in optical communication systems is continually growing. Data rate values in the order of several hundreds of TBps are expected in the near future. In order to cope with those expectations silicon based technologies are believed to be the best suited. Its naturally compatibility with CMOS easily enables the electronics and photonics co-integration. In the short-term the way increase data rates in next generation optical communication systems goes through using advanced modulation format and increase symbol rates. In the long-term view, new multiplexing techniques will be required. In this sense, mode division multiplexing is nowadays an attractive approach under consideration.In this Thesis work, the way to implement these new optical communication schemes is studied from the transmitter point of view. It includes, on a first part the modeling, design and characterization of silicon modulators. And in a second part, it includes the proposition, design and characterization of novel mode handling devices for mode division multiplexing.A new way of modeling silicon modulators has been developed. This new model permits to reduce the computation time of modulator analysis up to two orders of magnitude, while maintaining a good level of accuracy. Using the model, modulators based on lateral PN junctions and interdigitated PN junctions were designed to work in the O-Band of optical communications. Characterization work has been performed on these modulators with good results. Wide-open OOK (On Off Keying) eye diagrams with 10 dB extinction ratio were obtained at 10GBps. Furthermore, BPSK (Binary Phase Shift Keying) modulation was also demonstrated at 10GBps.New kind of mode converters and multiplexers, intended to work as mode division multiplexing subsystems have been proposed, designed, fabricated and characterized. Measured results show broad bandwidth operation with high extinction ratio.

Download or read book Advanced Modulation Formats for High bit rate Optical Networks written by Muhammad Haris and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of the proposed research is to investigate the performance of advanced modulation formats, specifically modified duobinary return-to zero (MD-RZ) modulation scheme and its long-haul repeaterless transmission over standard single mode fiber (SMF). This research also focuses on phase modulation formats like differential phase shift keying (DPSK) and differential quadrature phase shift keying (DQPSK), specifically free spectral range (FSR) optimization and wavelength offset tolerance in direct detection of these phase modulated systems. In this research we present a novel and cost effective technique to generate a modified duobinary return-to-zero (MD-RZ) signal. Next, we attained experimental results for single channel and WDM repeaterless transmission using these MD-RZ signals. A numerical comparison is also drawn with other conventional MD-RZ transmitters. MD-RZ transmission characteristics are also studied numerically for 40 Gb/s WDM signals and compared with other two leading constant intensity phase modulated formats like DPSK and DQPSK. We also have presented experimental results for FSR optimization of DQPSK de-modulator for ultra-high data-rate systems in the presence of strong optical filtering. Choice of an optimal FSR beyond 1-bit delay in Mach-Zehnder delay interferometer (MZ-DI) helps relieving some of the degradations due to strong optical filtering. Wavelength offset tolerance is also experimentally measured and numerically investigated for DPSK and DQPSK modulation formats with different transmitter schemes employing intensity or phase modulators to achieve required phase shifts.

Download or read book Advanced Modulation Formats for Optical Fiber Communication written by Benny Shamay and published by . This book was released on 2011 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Impact of Advanced Modulation Formats on the System Performance of High speed Optical Transmission Systems written by Wilfried Kaiser and published by . This book was released on 2003 with total page 145 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Investigation of advanced modulation formats for future optical fiber communications written by Joan M. Gené Bernaus and published by . This book was released on 2005 with total page 395 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Advanced Modulation Formats and Nonlinear Mitigation for Spectral Efficient Optical Transmission Systems written by Ivan Fernandez de Jauregui Ruiz and published by . This book was released on 2018 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Global data traffic is expected to reach up to 4.3 ZB per year by 2020. With the majority of the global communications being transported on submarine point-to-point fiber-optic systems, different cutting-edge technologies have been under research to cope with this unprecedented traffic growth. Continuous advances in high-speed integrated circuits have allowed the use of advanced modulation formats and digital signal processing (DSP) techniques to maximize the transmission spectral efficiency. With mitigation of fiber linear effects efficiently carried out by DSP with relative low-complexity, the capacity of modern fiber optic systems rests limited by fiber nonlinearities. To this extent, in the first part of this work, the performance and achievable benefits of low-complexity DSP techniques aiming to mitigate fiber Kerr nonlinear effects are investigated. Besides nonlinear compensation techniques, the use of multi-level modulation formats beyond 16QAM and high symbol rate channels have gained momentum to increase the system spectral efficiency. One of the major breakthroughs in the recent years, has been the introduction of QAM-based probabilistic constellation shaping (PCS-QAM), which has proven to outperform regular QAM formats. In this sense, in the second part of this work, the practical achievable rate increase brought by PCS-QAM for transoceanic distances is investigated. A theoretical and experimental comparison with other high-capacity formats is performed, and the design of a PCS-QAM for trans-Pacific distances is addressed. Finally, in the last section, several transmission records using the two above techniques are reported.

Download or read book Advanced Modulation Formats and Multiplexing Techniques for Optical Telecommunication Systems written by Ghafour Amouzad Mahdiraji and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The main objective in the communication systems is to transmit as much as possible information in as low as possible bandwidth and cost. Different modulation formats such as M-ary ASK, QPSK/DQPSK, QAM and DB are proposed to improve WDM channel capacity. M-ary ASK improves the channel capacity by transmitting more than one bit per signal element utilizing different signal levels or multilevel signals. QPSK/DQPSK utilizes multiple phases for transmit more than one bit per signal element. QAM improve channel capacity by transmitting more than one bit per signal element utilizing different phases and different amplitudes. DB use either three amplitude levels or two amplitudes (like binary signals) and one redundant phase element instead of the third level. All the advanced modulation schemes are limited to double or triple the channel utilization but all of them improve the channel capacity or the spectral efficiency. On the other hand, different multiplexing techniques such as TDM, WDM, OFDM, PDM and DCDM are proposed to improve the channel utilization. In TDM, different users share the same WDM channel by allocating each user different time slot. Using WDM, the available optical spectrum can be to utilize to support multiple numbers of users. In this technique, each user is assigned a wavelength as the carrier signal. In OFDM, utilizing IDFT many different RF signals can be assigned as the carrier for many low bit rate users. PDM allows two users to be carried over two different polarizations, vertical and horizontal polarizations. In DCDM, different users signed with different RZ duty cycles to share the same WDM channel. Except PDM, all other multiplexing techniques can support multiple users. Eventhough multiplexing techniques improve the channel utilization, but all of them except PDM, failed to improve the spectral efficiency of the link. PDM act like modulation schemes that can double the channel capacity or the spectral efficiency. Amongst all these multiplexing techniques and modulation schemes, PDM and QPSK/DQPSK or combinations of them have obtained the most attention in the communication systems. Finally, DCDM can reduce the clock recovery frequency significantly.

Download or read book All optical Wavelength Conversion of Higher order Modulation Format Data Signals written by Sepideh T. Naimi and published by . This book was released on 2016 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The future optical switched wavelength division multiplexed (WDM) networks will require all optical wavelength conversion to avoid contention in a node when two signals on the same wavelength are being switched to the same output fiber. These future networks will also employ advanced modulation formats in order to increase the capacity of optical networks. In order to perform wavelength conversion operations on advanced modulation formats, a coherent nonlinear process, such as four-wave mixing (FWM), is required to preserve the amplitude and phase information. The phase noise transfer problem has crucial significance for the exploitation of FWM-based wavelength converters for advanced modulation formats because the phase noise transfer degrades the overall system performance. In this work, the required optical signal to noise ratio (OSNR) and laser phase noise (linewidth) limits are calculated via Monte Carlo simulations for the wavelength conversion of advanced modulation formats including DQPSK and M-QAM. Due to the sensitivity of M-QAM signals with respect to phase noise, the conversion performance is investigated using two different decision-directed phase-locked loop carrier phase recovery algorithms. In order to develop a validated numerical model for all-optical wavelength conversion of advanced modulation formats, the required OSNR versus pump linewidth at two values of bit error rate (BER) of 10-3 and 10-4 for DQPSK, 16-QAM and 64-QAM are reported for degenerate and non-degenerate FWM. With these calculations, the performance of wavelength conversion of advanced modulation formats will be guaranteed by selecting lasers with linewidths below these linewidth limits. As a next step of this work, All-optical wavelength conversion of Nyquist-WDM Superchannel using FWM in an SOA based on advanced modulation formats such as DQPSK, 16 and 64- QAM are demonstrated.

Download or read book Advanced Modulation Formats and Digital Signal Processing for Fiber Optic Communication written by Albert Gorshtein and published by . This book was released on 2014 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Advanced Modulation Formats and MLSE Based Digital Signal Processing for 100Gbit sec Communication Through Optical Fibers written by Albert Gorshtein and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Advanced Modulation Formats and MLSE Based Digital Signal Processing for 100Gbit/sec Communication Through Optical Fibers.