• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2012.10a
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• pp.439-441
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• 2012

A new wavelength tunable laser source based on a self-seeded F-P LD for a WDM-PON system has been proposed in this paper. The proposed laser source has a merit of the wavelength tunable range of approximately 20 nm with very simple setup. The measured minimum relative intensity noise(RIN) was approximately -124 dB/Hz and the possibility of 10 Gb/s external modulation was showed.

• Korean Journal of Optics and Photonics
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• v.22 no.3
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• pp.122-128
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• 2011

The AWG-filtering effect was investigated on a bidirectional 100-GHz-channel-spacing WDM-PON link using spectrum-sliced and RSOA-amplified light sources for downstream signals and a wavelength reuse technique for upstream signals. Signal performances of three different filtering AWGs, including Gaussian, trapezoidal, and rectangular types, were compared on link transmission with fiber nonlinear effects. As an extinction ratio of a downstream signal varied, the effect for both directional signals was analyzed and optimized. It was found that there was an optimal pass bandwidth of an AWG for the balance between relative intensity noise decrement and cross phase modulation noise increment as the bandwidth got wider.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.43 no.5 s.347
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• pp.35-44
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• 2006

Reflective semiconductor optical amplifiers(R-SOAs) were designed with high gain, wide optical bandwidth, high thermal reliability and wide modulation bandwidth in TO-can package for the transmitter of wavelength division multiplexed-passive optical network(WDM-PON) application. Double trench structure and current block layer were introduced in designing the active layer of R-SOA to enable high speed modulation. The injection power requirement and the viable temperature range of WDM-PON system are experimentally analysed in based on Amplified Spontaneous Emission(ASE)-injected R-SOAs. The effect of the different injection spectrum in the gain-saturated R-SOA was experimentally characterized based on the measurements of excessive intensity noise, Q factor, and BER. The proposed spectral pre-composition method reduces the bandwidth of injection source below the AWG bandwidth and thereby avoids spectrum distortion impeding the intensity noise reduction originated from the amplitude squeezing.

• Electronics and Telecommunications Trends
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• v.28 no.6
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• pp.63-74
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• 2013

모바일, 클라우드, 빅데이터 등 최근 IT 산업의 패러다임의 변화로 인해 매년 25% 이상 증가하는 트래픽 추세에 따라 광 가입자망의 전송 기술도 빠르게 진화하고 있다. 가입자 망의 영역 확장을 위해 분기 수, 전송 거리 확대를 위한 기술개발 및 표준화 노력 또한 끊임없이 이어지고 있다. 링크당 40Gbps 이상의 전송 속도를 요구하는 차세대 광 가입자망 기술 중의 하나인 OFDM 기반 PON은 멀티캐리어 방식으로 대용량, 장거리 전송이 가능하며, 서브캐리어 별로 서비스를 분리할 수 있고, 유연한 서브캐리어 관리를 통해 동적 대역 할당이 가능하므로 향후 유무선 융합 가입자 망에 적합한 기술로써, 기존 광 분배망의 구조 및 시설 교체없이 WDM(Wavelength Division Multiplexing)-PON(Passive Optical Network), T(Time)DM-PON 기술과 융합하여, 전송 용량을 확장할 수 있는 큰 장점을 가지고 있다. 본고에서는 OFDMA-PON 기술을 소개하고, EU, 미국 등 선진 연구 기관의 연구동향을 소개하고 향후 전망에 대해 논하고자 한다.

• Journal of the Institute of Electronics Engineers of Korea SD
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• v.38 no.6
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• pp.412-419
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• 2001

In accordance with the PON(passive optical network) could be setup, effective connections with light sources, optical detectors, and optical fibers are the best sensitive points to represent the efficiency of network. Therefore, in this paper we designed and fabricated optical transceiver connection chip that was consisted of channel waveguide, Y-branch, and CWDM on the 2" BK7 glass substrate. This chip can be used for 1.31/1.55${\mu}{\textrm}{m}$ CWDM network and 1.55${\mu}{\textrm}{m}$ region dense WDM network.work.

• Journal of the Korea Institute of Military Science and Technology
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• v.10 no.2
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• pp.90-99
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• 2007

We demonstrate an 80km-reach 64-channel DWDM-PON based on wavelength-locked F-P LDs by changing the position of the C-band BLS for upstream channels from the CO to the RN. It mitigates the necessity of the high power C-band BLS and its handling problems. It also reduces back scattering induced penalty. We obtained less than $10^{-6}$ PLRs in all 128channels through 80km SMF. We also demonstrate a 240km-reach DWDM-PON based on wavelength-locked F-P LDs by adding a bidirectional erbium-doped fiber amplifier(EDFA). We show packet-loss-free transmission in all 128channels at 125 Mb/s per channel over 240km SMF We report the detuning effect of arrayed waveguide gratings(AWGs) and crosstalk effect in the implemented system. We Propose an architecture of a next generation defense wire communication system with the demonstrated long-reach DWDM-PON.