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We introduce a next-generation long-reach access optical network (35 dB loss budget +2 dB margin) delivering up to 40G/40G per passive 1:256 optical distribution network, supporting symmetrical 1 Gb/s rates per home user or up to 40 Gb/s for business users (e.g., enterprises, antenna sites). The proposed system is based on a novel spectrally efficient(More)
Flexibly optical transceivers (with reconfigurable rate and modulation format) may be efficiently realized using filter-bank based digital sub-banding. The new ASIC architecture achieves record low complexity and high performance. The processing is partitioned into two tiers. The filter-bank top tier is hard-coded in high-speed hardware, whereas the bottom(More)
We demonstrate a real-time FPGA realization of dual polarization filter banks – this high-speed 2x25 GBd low-complexity core establishes feasibility of energy-efficient (multipliers count ~halved) HW architecture for a digitally sub-banded 170 Gb/s DFT-S OFDM receiver. 1. Introduction Coherent optical transmission systems aim to provide spectrally efficient(More)
Subbanded digital signal processing (DSP) with underdecimated (Udeci) filter banks (FBs), is a recent DSP technique whereby the optical channel bandwidth is digitally sliced into multiple spectrally disjoint subbands (SBs) to be processed in parallel. In terms of DSP hardware (HW) architecture, digital subbanding amounts to an alternative mode of(More)
—We present yet another quasi-analytic model for an optically amplified receiver, comprising an optical preamplifier, an optical prefilter, a photodetector, and an electrical postfilter. Due to the square-law nonlinearity and its interaction with the linear pre-and postfilters, the understanding of this seemingly simple structure has been elusive, gradually(More)
In ultra-high-speed (>400Gb/s per wavelength), high-spectral efficiency coherent optical communication systems using multi-carrier spectral superchannels, the maximum reach is severely limited due to linear and, foremost, nonlinear impairments. Hence, the implementation of advanced digital signal processing (DSP) techniques in optical transceivers is(More)
We experimentally demonstrate a novel digital signal processing (DSP) structure for reduced guard-interval (RGI) OFDM coherent optical systems. The proposed concept is based on digitally slicing optical channel bandwidth into multiple spectrally disjoint sub-bands which are then processed in parallel. Each low bandwidth sub-band has a smaller delay-spread(More)
We demonstrate, to the best of our knowledge, the first real-time single-carrier frequency division multiple access transmitter designed to be used in photonic communication networks. It is capable of providing 10 Gbit/s net bitrate at 3.125 GHz slot bandwidth, providing data to nine quasi-Nyquist spectral groups. The transmitter is designed with respect to(More)
The state-of-the art for control of microring based devices is tuning just resonant phase. We introduce an extremum-seeking discrete-multitone adaptive controller, concurrently tuning both resonant phase and second coupling phase parameter optimizing microring critical coupling.