Electronics and Telecommunications Research Institute

Sung-hoon Kwak

Hark Yoo

Kwang-Joon Kim

Kwang-Ok Kim

Sung-Chang Kim

Yong-tae Kim

Kyeong-Hwan Doo

Dong-soo Lee

Wang-Joo Lee

Bin-yeong Yoon

Man-soo Han

Mun-seob Lee

Geun-yong Kim

Jong-deog Kim

Bong-kyu Kim

Le Quan

Provided are an apparatus and method for efficiently and dynamically allocating a bandwidth on a Time Division Multiple Access-based Passive Optical Network (TDMA PON). The dynamic bandwidth allocation apparatus for uplink data transmission of a plurality of Optical Network Units (ONUs) including a plurality of class queues corresponding to Transmission Container (T-CONT) types, the plurality of ONUs connected to an Optical Line Terminal (OLT) on a Passive Optical Network (PON), includes: a class queue information storage unit storing information regarding a bandwidth allocation period and an allocatable bandwidth amount for each T-CONT type; an allocation check table unit checking the bandwidth allocation period for the T-CONT type received from the class queue information storage unit, and determining an allocatable bandwidth amount for the T-CONT type; and a bandwidth allocation unit allocating an uplink bandwidth to the T-CONT type with reference to the bandwidth allocation period and the allocatable bandwidth amount for the T-CONT type, and re-allocating to each ONU an uplink bandwidth remaining after allocating a total uplink bandwidths to all T-CONT types.

Apparatus and method for efficient bandwidth allocation on time division multiple access-based passive optical network (TDMA-PON)

Provided are a method and an apparatus for detecting the fault of an optical switch. The apparatus includes an optical monitoring signal generator, a coupler, a splitter, a plurality of optical detecting and output power transition sensing units, and a fault determiner. The optical monitoring signal generator generates optical monitoring signals having different wavelengths from optical signals including data to be transmitted. The coupler optically couples the optical monitoring signals to the optical signals including data to be transmitted and inputs the coupled optical signals to an optical switch. The splitter splits the optical monitoring signals from optical signals output from the optical switch. The plurality of optical detecting and output power transition sensing units detect output power transitions of the split optical monitoring signals. The fault determiner receives information on setting the optical switch from an external source, compares the information with the detected output power transitions of the split optical monitoring signals, and determines whether the optical switch malfunctions depending on whether the information coincides with the detected output power transitions of the split optical monitoring signals.

Method and apparatus for detecting optical switch fault by monitoring optical output transitions

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Daejeon-si, South Korea

Sung-hoon Kwak