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Journals and Conferences
The passive optical network (PON) is an optical fiber based network architecture, which can provide much higher bandwidth in the access network compared to traditional copper-based networks. Incorporating wavelength-division multiplex-ing (WDM) in a PON allows one to support much higher bandwidth compared to the standard PON, which operates in the "… (More)
We demonstrate a mitigation of fiber nonlinearity based on μ-law companding transform in coherent optical OFDM transmissions. High peak-to-average power ratio (PAPR) increases fiber nonlinear impairments caused by the Kerr effect in optical fiber. The μ-law companding modifies amplitude profile of OFDM signal with time domain signal processing, which… (More)
In P2P overlay network, peers are able to directly share and exchange information without the help of a server. This results in a prompt and secure sharing of network resources and data handling. However, flooding algorithm that is used in distributed P2P network generated query message excessively. Our objective in this paper is to proposes a presents a… (More)
SCTP (Stream Control Transmission Protocol) is a new IETF transport protocol over the IP network. Transport protocol is responsible for reliable delivery of a message form a host to another host. We proposed and implemented an efficient file transfer system using the SCTP multiple file transfer and modified STCP congestion control mechanism to guarantees a… (More)
Mode division multiplexed optical transmission enabled by all-fiber mode multiplexer is investigated. The proposed all-fiber mode multiplexer is composed of consecutive mode selective couplers. It multiplexes or demultiplexes LP01, LP11, LP21, and LP02 modes simultaneously. We demonstrate successful transmission of three spatial modes with 120 Gb/s PDM-QPSK… (More)
The impact of multi-rate transmission on 100- Gb/s QPSK based modulation format in a 10G/40G/100 Gb/s hybrid systems is investigated. The solutions for the suppression of nonlinear interactions from lower rate channels are also presented.
In this paper, after a brief introduction of related Korean industrial situation, 40G/100G optical transmission R&D efforts in ETRI are described.
Hybrid fiber amplifier (HFA) has the advantages of low noise figure and high output power. The transmission performance is better than conventional EDFA by >1.0 dB of Q-factor in 720 km SMF transmission.
Digital symbol synchronization of optical binary phase shift keying signals is experimentally demonstrated. Algorithm of timing error feedback is proposed for coherent intradyne reception. The feedback loop operates stable in the range of symbol rate, 9.7 approximately 10.3 GSymbol/s with 20 GSampling/s at relatively high bit error rate of approximately… (More)