High bit rate burst mode optical OFDM for next generation passive optical networks

Highly Spectrally Efficient Discrete Multi-Tone Transmission over Step Index PMMA optical fibre for Short-Range Optical Communication

“…The others optical sources have the same behavior and follow the frequency profiles of Figure 5 (bottom). Note that, in Figure 6, the figure shows the first step of the modified Levin-Campello algorithm [15][16]. Then, all the sub-carriers use the same constellation, as explained in Section III.…”

“…First, a probe signal is transmitted in which all subcarriers have the same power and are QPSK modulated. The first step allows measuring the signal-to-noise ratio (SNR) of the channel, which will be used by the rate-adaptive modified version of the Levin-Campello algorithm presented in [15][16]. This modified Levin-Campello [15][16] aims to reach a bit allocation policy closer to the channel capacity for each sub-carrier.…”

“…The first step allows measuring the signal-to-noise ratio (SNR) of the channel, which will be used by the rate-adaptive modified version of the Levin-Campello algorithm presented in [15][16]. This modified Levin-Campello [15][16] aims to reach a bit allocation policy closer to the channel capacity for each sub-carrier. A similar approach, with a distinct optimization problem and results, is found in [17].…”

Wide Dynamic Range Reception of TDM-Based DCO-OFDM Signals Using Optical Domain Power Equalization and Symmetrical Clipping Techniques

“…These factors may negate the great cost-effectiveness provided by this shared system configuration similar to conventional TDM-PONs. The other is a TDM-based OFDM-PON, where DCO-OFDM burst signals are directly detected by a single OLT [12], [18]. Since TDM- based PON systems do not require any precise synchronization techniques between ONUs and upstream transmission can be provided by using a single wavelength, it is considered to be more cost-effective than OFDMA-PON.…”

“…In the field of optical communications, investigations in the application of OFDM started with the aim of dispersion tolerant transmission over multi-mode fibers [6], [7], high-speed signals [8], [9], or long haul links [10], [11] due to the particular benefits of OFDM's basic characteristics of high spectrum efficiency and low symbol rate. Recently, some other applications of OFDM that take advantage of its bandwidth elasticity have been proposed: asymmetric digital subscriber linelike flexible bandwidth assignment in access networks [12] and effective utilization of wavelength bandwidth in core networks [13]. These technical trends are expected to support the future access network requirements mentioned above.…”