To explore the need for a graduate level engineering course in optical networking, a needs assessment consisting of (i) an investigation of 14 existing optical networking courses, (ii) an analysis of online surveys among the networking community and the ASU electrical engineering department, (iii) faculty interviews, and (iv) focus groups was conducted. Survey responses from a total of 61 respondents were received and analyzed. The results support the need for a graduate level course in optical networking. Our analyses indicate that a graduate course in optical networking should (i) focus on the basic mechanisms and current trends in optical networking, (ii) be based on a text book and instructor slides combined with collections of examples and problems. Regarding the optimal delivery method it was found that current students and faculty strongly prefer face-to-face delivery complemented by on-line readings and assignments, whereas working engineering professionals are more open to the idea of online courses.
Streaming of continuous media over wireless links is a notoriously difficult problem. This is due to the stringent Quality of Service requirements of continuous media and the unreliability of wireless links. We develop a streaming protocol for the real-time delivery of prerecorded continuous media from a central base station to multiple wireless clients within a wireless cell. Our protocol prefetches parts of the ongoing continuous media streams into prefetch buffers in the clients. Our protocol prefetches according to a Join-the-Shortest-Queue policy. By exploiting rate adaptation techniques of wireless data packet protocols, the Join-the-Shortest-Queue policy dynamically allocates more transmission capacity to streams with small prefetched reserves. Our protocol uses channel probing to handle the location-dependent, time-varying, and bursty errors of wireless links. We evaluate our prefetching protocol through extensive simulations with VBR MPEG encoded video traces. Our simulations indicate that for burst VBR video with an average rate of 64 kbit/sec and typical wireless communication conditions our prefetching protocol achieves client starvation probabilities on the order of 10-4 and a bandwidth efficiency of 90% with prefetch buffers of 128 kBytes.
In this paper, we report on a scalable and reliable switchless wavelength division multiplexing (WDM) network that is based on an arrayed-waveguide grating (AWG). All wavelengths are used for data transmission and signaling is done in-band. Each node at the network periphery is equipped with a single tunable transceiver for data and a broadband light source for control while the network itself is completely passive. Broadcasting is realized by spectrally slicing the broadband signal. The proposed random distributed medium access protocol is reservation based and schedules variably sized data packets on a first-come-first-served and first-fit basis without resulting collisions. The protocol supports both packet and circuit switching and allows for multicasting. The degree of concurrency is significantly increased by using multiple free spectral ranges (FSRs) of the AWG, spatially reusing wavelengths and transmitting data and control informations simultaneously by means of code division multiplexing. Our analytical results demonstrate that exploiting multiple FSRs of an AWG significantly improves the throughput-delay performance of the network.
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