Electronics and Telecommunications Research Institute

Korea Telecommunication Authority

Dong Choon Lee

Youn Seon Jang

Sang Jo Park

Ho Jae Lee

Jae Guen Kim

Ho Geon Kim

Phil Joo Moon

The present invention relates to a routing address encoder, a routing controller, and a routing switch, which decrease the number and the length of optical splitting and optical delay line at optical routing circuits in optical communication network. A routing address encoder in accordance with an embodiment of the present invention includes a pulse generator, an external modulator, an optical address generator, an address selection signal generator, an optical switch, and optical OR gate means. An optical routing circuit for decoding optical routing information received from optical communication network and routing optical signals on the basis of routing address is provided. An optical routing circuit includes an optical splitter, a routing controller, and a routing switch.

Optical self-routing scheme with low optical loss and compact size

A composite network protective/recovering device includes first to fourth input/output (I/O) modules. The first and third I/O modules are operational modules and the second and fourth I/O modules are protective modules. A first span connection group connects the first I/O operational module with the second I/O protective module. A second span connection group connects the third I/O operational module with the fourth I/O protective module to perform span switching. A first bidirectional line switching ring connects the first I/O operational module and the third I/O operational module to form a bidirectional ring which has two lines in each direction. A second bidirectional line switching ring is connected to the first to fourth I/O modules to form transmitting/receiving operational lines which include two lines in each direction and protective lines which include two lines in each direction. Cross-connection (DXC) module performs cross-connecting function between signals which are transferred through the I/O modules and classifies signals to be added or dropped.

Composite network protective/recovering device for synchronous digital

Growing community of inventors

Daejeon, South Korea

Dong Choon Lee