The growing bandwidth demands of advanced driver assistance systems (ADAS) and infotainment technologies make Gigabit Ethernet over plastic optical fiber (POF) a natural choice for next-generation automotive data networks, especially in light of the recent approval of the IEEE 802.3bv standard for Gigabit Ethernet transmission over POF. POF-based transmission provides the advantages of low cost, light weight, easy termination, durability, and immunity to electromagnetic interference (EMI), while Gigabit Ethernet extends the current maximum data rate of 150 Mb/s provided by Media Oriented Systems Transport (MOST). Thus, we examine important design choices that impact the performance of POF-based automotive data links for data rates up to and beyond 1 Gb/s and different choices of modulation format, including NRZ and PAM-n. Because simulation is an efficient and cost-effective solution for studying the complex interplay of multiple design choices without requiring physical prototypes, we base our analysis on a comprehensive modeling framework for optical communication systems incorporating large-core step-index fiber and fiber-to-fiber connectors. We study anticipated system performance in terms of bandwidth and BER for different choices of link length and connector count, including the IEEE 802.3bv targets of 15 meters with four connectors and 40 meters with no connectors. In addition, we consider the impact of connector misalignments (both lateral and longitudinal) and source launch profile (measured in terms of its encircled angular flux, or EAF), which also directly affect link bandwidth.
While system-level simulation can allow designers to assess optical system performance via measures such as signal
waveforms, spectra, eye diagrams, and BER calculations, component-level modeling can provide a more accurate
description of coupling into and out of individual devices, as well as their detailed signal propagation characteristics. In
particular, the system-level simulation of interface components used in optical systems, including splitters, combiners,
grating couplers, waveguides, spot-size converters, and lens assemblies, can benefit from more detailed component-level
modeling. Depending upon the nature of the device and the scale of the problem, simulation of optical transmission
through these components can be carried out using either electromagnetic device-level simulation, such as the beampropagation
method, or ray-based approaches. In either case, system-level simulation can interface to such componentlevel
modeling via a suitable exchange of optical signal data. This paper presents the use of a mixed-level simulation
flow in which both electromagnetic device-level and ray-based tools are integrated with a system-level simulation
environment in order to model the use of various interface components in optical systems for a range of purposes,
including, for example, coupling to and from optical transmission media such as single- and multimode optical fiber.
This approach enables case studies on the impact of physical and geometric component variations on system
performance, and the sensitivity of system behavior to misalignment between components.
In this paper, we demonstrate a computer model for simulating a dual-rate burst mode receiver that can
readily distinguish bit rates of 1.25Gbit/s and 10.3Gbit/s and demodulate the data bursts with large power
variations of above 5dB. To our knowledge, this is the first such model to demodulate data bursts of
different bit rates without using any external control signal such as a reset signal or a bit rate select signal.
The model is based on a burst-mode bit rate discrimination circuit (B-BDC) and makes use of a unique
preamble sequence attached to each burst to separate out the data bursts with different bit rates. Here, the
model is implemented using a combination of the optical system simulation suite OptSimTM, and the
electrical simulation engine SPICE. The reaction time of the burst mode receiver model is about 7ns, which
corresponds to less than 8 preamble bits for the bit rate of 1.25Gbps. We believe, having an accurate and
robust simulation model for high speed burst mode transmission in GE-PON systems, is indispensable and
tremendously speeds up the ongoing research in the area, saving a lot of time and effort involved in
carrying out the laboratory experiments, while providing flexibility in the optimization of various system
parameters for better performance of the receiver as a whole. Furthermore, we also study the effects of
burst specifications like the length of preamble sequence, and other receiver design parameters on the
reaction time of the receiver.
Passive Optical Network (PON) based access architecture is the most favored choice for delivery of triple-play
services today. This paper reviews various PON technologies, requirements, challenges and trade-offs
involved in modeling and design optimizations of PON systems and
sub-systems, mainly from the physical
Designing broadband access networks involves selecting the topology that satisfies the network requirements, and comparing the performance of different what-if scenarios in order to achieve the optimal network layout. Modeling software tools are instrumental for each phase of the design cycle and help answering to complex questions such as what is the impact of single- and multi-mode fiber linear and nonlinear effects, what is maximum fiber length before eye closure, how many regenerators are needed and where they have to be placed. This paper shows through a series of examples how modeling tools can be used for single- and multi-mode broadband access network design and planning.