Optical protection switches for trunk transmission systems

Two different types of optical matrix switches are presented for use as protection switches. One is an optoelectronic matrix switch using Si pin photodiodes. The first switch configuration offers two advantages for large matrix fabrication: high off-state output impedance and no electrical power requirement for establishing the off-state. The other is an optical-wavelength-division matrix switch, using an acoustooptic deflector, which requires minimal hardware for switching and realizes unlimited bandwidth. The switching speed, crosstalk, attainable matrix size, and optical source requirements are evaluated for both switches. Their protection system application schemes are clarified.<
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