In order to set up a bidirectional connection path in an optical transmission system
composed of a number of Switched optical network nodes having a number of unidi …

The optical node comprises two working directional switches (22, 27) connected serially in a
primary ring line (2), respectively ahead of and after an extracting and/or inserting unit (11) …

In an optical transmission system including at least one ring network configured by plural
nodes, each node of the ring network is provided with the optical Switch having connec tion …

An optical communication network, an optical information transmission method and network
node devices for use in an optical communication network, in which optical signals are …

The control of the transmission of useful optical signals on different line paths of an optical
transmission device is accomplished via at least one of the following features: using Signal …

In the optical multi-branch communication System, a parent device (1) and a plurality of
daughter devices (2-1 to 2-n) having a redundant construction are connected to each other …

(57) ABSTRACT A bidirectional line switched ring network which enables high-speed
operation with improved reliability because of a reduced software processing load is …

An automatically switched optical network includes several areas of a transmission plane
and a control plane, and a method for data transmission in the network includes that when …

An optical network which can exhibit a protection function at the time of an abnormality in
communication and which is effective in an optical network (PON) comprised of a mix of …

In an optical network, a logical channel is established between two optical Switches in
response to a control message over multiple optical linkS. At least one optical transmission …