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22 March 1983 Use Of Wavelength Division Multiplexing (WDM) In Duplex Data Links For Field Applications
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A number of schemes for wavelength division multiplexing (WDM) have been reported in the literature in the past few years. However, most of them tend to be laboratory devices used in demonstrating the principle of operation. Recently a simple, low cost, and rugged wave-length multiplexer (X-MUX) based on the interference filter has been devised at Lockheed. These multiplexers have also been used as the central elements for duplexed data links in field applications and have performed exceedingly well. Typically, these X-MUXs have inser-tion loss of 2 dB and a crosstalk between channels of 33 dB at a channel separation of 22 nm. When used in 3-km duplex links, electrical crosstalk between 15 MHz video channels is less than -40 dB, and in 10 MBPS digital links (with contributions from system noise) BERs of less than 10-10 are realized. In this paper, the principle of operation, mechanical con-struction, and test results of the X-MUX will be reported. Detailed test results on full duplex links (up to 3 km link length) will be presented. Use of A-MUX, directional coup-lers, and optical switches for computer interconnects will be discussed. Finally, the use of integrated optic devices for such endeavors will be suggested.
© (1983) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
K. K. Chow, A. H. Fitch, and B. E. Kincaid "Use Of Wavelength Division Multiplexing (WDM) In Duplex Data Links For Field Applications", Proc. SPIE 0355, Fiber Optics: Short-Haul and Long-Haul Measurements and Applications I, (22 March 1983);

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