Optical ring network with optical subnets and method

Optical ring protection apparatus and methods

Optical ring transmission system using squelch method

Optical shared protection ring for multiple spans

Optical signal switching device for use in an optical...

Optical switch having an autorestoration feature for...

Optical telecommunication system with automatic channel...

Optical transmission apparatus

Optical transmission apparatus

Optical transmission equipment

Optical transmission equipment

Optical transmission system with bidirectional connection...

Optical transmission systems including optical protection...

Optical transmission systems, devices, and methods

Parallel high-speed communication links with redundant...

Passive optical network system and method for protecting the...

Photoelectric cross-connect system

Preventing signal loss in an optical communications network

Protected bidirectional WDM network

Protection in mixed optical WDM systems