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15 September 1993 Monolithic semiconductor active waveguide optical switch
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We have utilized a semiconductor optical amplifier (SOA) as an optical gain/absorption switch and have demonstrated an array of such switches in the form of a monolithic 4 X 4 optical crossbar switch. This device is completely nonblocking and can be operated in either a point-to-point or broadcast mode, simultaneously linking any combination of four input/output ports on one side with any combination of ports on the other. It is housed in a standard hybrid flatpack, with external control leads and eight connectorized optical fibers. The device consists of ridge waveguides, etched-facet turning mirrors, and etched T-branches laid out into an all- optical-path network. It is fabricated from a single GaAs quantum well/AlGaAs GRINSCH epitaxial structure on an N+ GaAs substrate. Because the paths are optical, they transmit signals in either direction -- i.e., the device can operate in a duplex (bidirectional) mode. We have demonstrated switching functionality, simultaneous routing of two digital FM video signals, and routing of pseudo-random NRZ data.
© (1993) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Chet L. Balestra, Richard J. Blackwell, Bartley C. Johnson, and L. G. Perrymore "Monolithic semiconductor active waveguide optical switch", Proc. SPIE 1953, Photonics for Space Environments, (15 September 1993);

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