Abstract
The SONET self-healing ring has recently emerged as a viable means of providing survivable interconnection among telephone central offices.1 In the event of a link or node failure, such a ring electronically reconfigures, generating a loop-back path that preserves ring integrity. In its conventional form, this scheme has the disadvantage of requiring duplicate high-speed electronic multiplexers at each node in its protection path; however, this disadvantage can be mitigated by employing an optical protection path containing lightwave amplifiers in place of the duplicated high-speed electronics.2 Here we demonstrate such an optical protection network comprising six amplifiers spanning >200 km, about the size range of interest for survivable interoffice rings in metropolitan areas.
© 1992 Optical Society of America
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