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Photonic switching systems can generally be divided into three categories: space-division(SD)121, TIME-DIVISION(TD)3, and wavelength-division(WD)4. However, for important goals, such as transmission and management of large amounts of video information, a combined system must be used for high degrees of multiplexity. This paper proposes a combined photonic TD and WD switching network for a photonic switching system. This paper compares the number of optical devices required for this proposed structure with conventional structures. And, finally, This paper shows how the proposed structure can further reduce the total number of optical devices required., This article is from 'OSA Proceedings of the International Topical Meeting on Photonic Switching Held in Salt Lake City, Utah on 6-8 March 1991. Volume 8,' AD-A253 026, p167 thru p170.

A wavelength conversion laser application to wavelength-division photonic cross-connect system is presented. We successfully achieved error-free operation in wavelength switching at a 125-Mbit/s data rate., This article is from 'OSA Proceedings of the International Topical Meeting on Photonic Switching Held in Salt Lake City, Utah on 6-8 March 1991. Volume 8,' AD-A253 026, p137 thru p139.

In this paper, we propose a multistage optical interconnection network using polarization switch arrays which is capable of realizing a multichannel reconfigurable optical interconnection network. The basic operation has been demonstrated with two-stage 4x4 network testbed using liquid crystal light valves (LCLVs). Furthermore, the feasible channel number as a function of the optical beam size and the routing algorithm for the 8x8 nonblocking crossconnect network are discussed. Finally, a concept of the extended 16xl6 Banyan network suitable for the integrated structure is presented., This article is from 'OSA Proceedings of the International Topical Meeting on Photonic Switching Held in Salt Lake City, Utah on 6-8 March 1991. Volume 8,' AD-A253 026, p67-71.

In a ultra-long system with cascaded erbium-doped fiber amplifiers(1) (EDFAs), in order to keep a signal-to-noise ratio (SNR) as high as possible, EDFA(2) having high output power and low noise is highly required as a post-amplifier or as an in-line-amplifier. Such an EDFA is also important for optical pre-amplifiers with large dynamic ranges. Although Way et al. reported a low noise figure (NF) in a saturation region under the condition of sufficiently high pump power(3), the relationship between lowering the NF and optimizing the gain of EDFA was not clear. In this paper, we report that an EDFA having both a high output power (+15dBm) and a low NF (6dB) can actually be realized using 1.48um pump LDs when the EDFA length is optimized to give a maximum gain for large signal power. In addition, we also show that there is a remarkable difference between forward and backward pump in terms of NF characteristics of EDFA in a deep saturation., This article is from 'OSA Proceedings of the Topical Meeting on Optical Amplifiers and their Applications Held in Snowmass Village, Colorado on 24-26 July 1991. Volume 13, AD-A252 974, p174 thru 177.

This paper describes the design methods and the experimental results of the timing tank mechanical filter. The composite longitudinal mode transducer was made into a sandwich structure by affixing a constant modules alloy plate to each electrode surface of the piezoelectric ceramic plate. The equivalent electrical circuit constants and the suppression of spurious responses due to the third order longitudinal mode of the transducer were analyzed. The dimensions of the experimental filter were 20L x 12W x 5H mm, the some sizes as a 14-pin dip IC. The center frequency of the filter is 200 kHz and it has low insertion loss of 0.5 to 0.7 dB and a bandwidth of 2.1 to 2.4 kHz 3 dB. The I/O phase differences at the center frequency was about 40 degrees. The inclination of the phase was as small as 0.07 to 0.08 deg/Hz and the phase linearity was excellent. The attenuation band has 30 dB or more attenuation over the wide range from 0 to 1.5 MHz to improve the signal to noise ratio of the equipment., This article is from the Proceedings of the Annual Symposium on Frequency Control (37th), 1-3 Jun 83, Marriott Hotel, Philadelphia, Pennsylvania, AD-A136 673, p376-386.