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This presentation reviews recent progress and ongoing standards development for WDM LANs within the SAE International's Avionics Systems Division (ASD) — Technical Committee AS-3. The focus is on AS5659 standards documents that address specification of optical backbone network interfaces, access and aggregation techniques, network control and the optical physical layer for networks on-board aircraft.
Following the increasing availability of reliable optical components, issued from the telecom domain, RF-optical links based on commercial modules have achieved performances which are close enough to system requirements to be extensively considered. With accurate understanding and modeling of these components, it has been demonstrated that RF photonics can be implemented to transmit and process RF...
Recent R&D projects have placed SRICO at the forefront of Thin Film Lithium Niobate (TFLN™) technology to create advanced photonic, electro-optic devices and nonlinear optical devices. This talk will address the method of producing TFLN™ and results of novel devices fabricated using thin film lithium niobate. Key avionics and defense applications include phased array radar, free space optical...
Optical frequency combs (OFCs) from a variety of laser sources have found applications in many areas of scientific interest in the last decade such as optical arbitrary waveform generation, optical signal processing and coherent communication[1], and multi-heterodyne spectroscopy [2]. OFCs consist of a set of discrete optical components with an individual finite linewidth and a fixed phase relationship...
Multi-core fiber (MCF) optic shape sensing offers the possibility of providing in-flight shape measurements of highly flexible aerospace structures and control surfaces for such purposes as gust load alleviation, flutter suppression, general flight control and structural health monitoring. Photogrammetric measurements of surface mounted MCF shape sensing cable can be used to quantify the MCF installation...
Aircraft communications networks are rapidly progressing beyond simple point to point links with Wavelength Division Multiplexed passive optical networks (WDM-PON) emerging as a possible solution. The use of WDM-PONs on aircraft presents significant operational barriers, most notably with respect to operational temperature ranges such as −55 °C to +125 °C. It has previously been shown that a WDM-PON...
Optical Networking with Wavelength Division Multiplexing (WDM) has the potential to satisfy the future needs of both military and commercial communication systems due to the corresponding high bandwidth provision, low electromagnetic interference, and light weight. However, fiber optic components are susceptible to faults, particularly in hazardous working conditions. Therefore, there is a need to...
Fiber optic systems are often cited as a way to gain EMI immunity, reduce weight, and increase bandwidth. Avionics Full-Duplex Switched Ethernet (AFDX), specified in ARINC 664 Aircraft Data Network, Part 7, is a fiber optic avionics bus specification used on the Airbus A380, Boeing 787, and others. It was designed as an upgrade to the standard Ethernet protocol which added guaranteed determinism with...
With avionic platforms moving toward integrated optical networks, platforms are replacing electrical components with their optical counterparts. Replacing electronic components and copper wire with photonic chips and optical fibers provide large means of reducing the overall Size Weight and Power (SWaP), which is highly desirable for deployed avionic platforms [1–2]. In an optical LAN, optical fibers...
A system architecture based on millimeter-wave wireless over fiber sensor communication networks for avionic system sensing, control and communications is investigated here. The objectives are to study and define the optimal network structures and protocols for the proposed millimeter-wave WSCNs, and evaluate the system performance in terms of reliability, scalability, power consumption and cost....
In this paper, we show recent results in the use of stabilized optical frequency combs from mode-locked diode lasers operating in the telecommunication C-band for applications in coherent parallel signal processing architectures [1]. For selecting and modulating single components within the frequency comb, novel approaches that rely on the properties of injection locked oscillators will be used. These...
UWB radio can provide high speed wireless communications. An overview of the techniques developed recently for the generation, encoding and distribution of impulse UWB signals in the optical domain is provided.
RF frequency conversion is an important function for many high frequency communications systems. A nonlinear element such as an RF mixer is often used to convert signals from high to intermediate and baseband frequencies. The linearity and bandwidth of the RF mixer are important system parameters. Linearity is usually quantified by the level of intermodulation distortion products from a two-tone test...
Microwave photonic (MWP) links with a low noise figure and high dynamic range are required for antenna remoting, radio-over-fiber (RoF), and other advanced applications. MWP links have recently been demonstrated with noise figures approaching 3 dB, without any electrical preamplification, by using low-noise high-power laser sources in conjunction with efficient optical intensity modulators and high-power...
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