The design of a scalable optical local area network formultiprocessing systems is described. Each workstation has aparallel-fiber-ribbon optical link to a centralized complementarymetal-oxide silicon (CMOS) switch core, implemented on a singlecompact printed circuit board (PCB). When the Motorola Optobusfiber technology is used, each workstation has a data bandwidth of 6.4Gbits/s to the core. A centralized switch core interconnecting 32workstations supports a 204-Gbit/s aggregate data bandwidth. Theswitch core is based on a conventional broadcast-and-selectarchitecture, implemented with parallel CMOS integrated circuits(IC's). The switch core scales well; by incorporation of theCMOS optoelectronic IC's with optical input-output, the electricalcore can be reduced to a single-chip optoelectronic IC with terabitcapacities. A prototype of an optoelectronic switch core has been fabricated and is described. The appeal of the architectureincludes its reliance on commercially available parallel-fibertechnology, its reliance on the well-developed markets of local areanetworks and networks of workstations, and its smooth scalability from the electrical to optical domains as technology matures.
We present a cross-axial and a co-axial miniature Fabry-Perot pressure sensor fabricated at the tip of an optical fiber with a prewritten Bragg grating by using maskless photolithography process and UV curing polymer process. The optical fiber serves as an intrinsic mask for sensor fabrication as well as a waveguide for sensor interrogation. A polymer-metal composite thin diaphragm is employed as the pressure transducer. The overall sensor size is almost the same as that of a standard single mode optical fiber. Experimental study shows that the sensors exhibit good linearity over a pressure range of 1.9-9.4 psi, with sensitivities of 0.0094 m psi and 0.0011 mpsi for the cross-axial and co-axial sensors, respectively. The fiber Bragg grating is exploited for simultaneous temperature measurements or to compensate for temperature effects in pressure readings. The dynamic response of the sensors is also evaluated and discussed. These sensors are expected to impact many fronts that require miniature and inexpensive sensors for reliable static and transient pressure measurements of fluids.Index Terms-Fabry-Perot, lithography, pressure measurement, temperature dependence.
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