Schofield Technologies, Inc.

Nokia Siemens Networks Oy

Antti Pietilainen

Yinghua Ye

Olli-Pekka Pohjola

A solution for detecting and recovering from a failure in a protected single-fiber passive optical network. A detector is used to detect the degradation in power level of optical signals. Furthermore, the invention discloses a variable symmetric split ratio approach to improve the number of splits (e.g. the number of ONUs). A single-fiber passive optical network is disclosed that uses a plurality of passive nodes connected in the optical fiber between the interfaces, wherein in the passive nodes 2-by-2 splitters/combiners are used to couple optical power from and into the optical fiber at a predetermined split ratio.

Single-fiber protection in telecommunications networks

A method and communication system, are discussed, including a plurality of communication nodes connected by a data link, and a communication controller configured to allocate link-level addresses to the communication nodes. The communication nodes may be identified for communications over the data link. The communication controller is further configured to change from time to time the link-level addresses allocated to each communication node and to transmit the newly allocated link-level address to a respective communication node in an encrypted form.

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Espoo, Finland

Antti Pietilainen