• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2012.10a
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• pp.638-641
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• 2012

Optimal net residual dispersion (NRD) and effective launching power range of optical transmission links with random distribution of single mode fiber (SMF) length and residual dispersion per span (RDPS) required to flexibly design of optical links in dispersion management (DM) technique for compensating the distorted 960 Gbps optical signals due to interaction of group velocoty dispersion (GVD) and optical nonlinear effects are induced.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.34 no.6B
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• pp.568-574
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• 2009

320km optical transmission link for 128 channel DWDM (dense wavelength-division-multiplexing) signals is simulated and fabricated. An optical fiber amplifier for the link is composed of a distributed Raman amplifier and dual C/L-band EDFAs which are optimized for the performances of an optical amplifier obtained from the simulation. Gain and NF of the optimized EDFAs are above 19dB and below 7.5dB, respectively. The resultant OSNRs (optical signal to noise ratios) of the link are average 25dB on each band.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.8 no.7
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• pp.1576-1580
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• 2004

The recent trend of information communication is to focus on improving communication services in order to satisfy the customer's desire for various information. Optical transducers of Local Area Network use 850nm or 1310nm among wavelength ranges and LD as a light source. However, Vertical Cavity Surface Emitting Laser(VCSEL) which is very excellent to deal with data processing is used at long wavelength or Gbps. In this paper, after basic optical characteristics were introduced a optical transmission module was developed to be operated over GHz and its transmission characteristics were analyzed at 2.5GHz and 3GHz with pulse pattern generator.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2013.10a
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• pp.975-977
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• 2013

The optimal distribution pattern is induced in the optical link with an artificial distributions of single mode fiber (SMF) lengths and residual dispersion per span (RDPS). It is confirmed that the descending distribution of SMF length and ascending distribution of RDPS are most suitable to compensate for the distorted WDM signals, as the fiber span number is more increased. in the optical link with 10 ps/nm or -10 ps/nm the optimal net residual dispersion (NRD).

• Journal of Advanced Navigation Technology
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• v.19 no.2
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• pp.147-152
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• 2015

The compensation characteristics of WDM channels depending on residual dispersion per spans (RDPS) deviation in optical links with the randomly distributed RDPS for the adaptive configuration are investigated in this paper. Also, the link design rule related with RDPS deviations is proposed, from the viewpoint of the allowable net residual dispersion (NRD). It is confirmed that the effect of compensation for the distorted WDM channels is more increased as RDPS deviation is smaller. Also, it is confirmed that the decrease of the allowable NRD range for the exact eye opening penalty (EOP) is proportional to RDPS deviation. Therefore, the results of this research is expected to be the design reference for the flexible link configuration of long-haul optical transmission links.

• ETRI Journal
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• v.9 no.2
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• pp.14-23
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• 1987

본고에서는 한국전기통신공사의 출연금으로 연구개발된 565Mbit/s 광전송시스팀의 설계 및 특성을 다루었다. 565Mbit/s 광전송시스팀은 DS3 (44.736 Mbit/s) 및 DS4(139.264 Mbit/s) 신호 를 종속신호로 접속할 수 있으며 중계국에서 종속신호의 드롭 및 인서트가 가능하다. 절체 비율이 최대 11 : 1까지 가능하고, 상세한 시스팀 성능감시가 가능하다. 이때의 유지보수 구간은 국내의 여건을 고려하여 600km로 하였다. 설계 된 광송신 출력은 -3dBm이상,수신감도는 BER 10E-9에서 -37.8dBm, 시스팀 마진을 고려한 최대 중계거리는 27km이었다. 현재 이와같은 성능 및 특성은 범용 IC로 설계되고 구현되어 확인되었다. 그리고 565 Mbit/s 광전송시스팀은 시스팀의 신뢰성 제고 및 경제성을 위하여 주문형 반도체화를 추진하고 있으므로 주문형 반도체화가 끝나면 국내의 장거리 시외국간용이나 대용량 시내국간 중계에 대량으로 사용될 것이 예상된다.

• Proceedings of the Korean Institute of Communication Sciences Conference
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• 1995.10a
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• pp.919-922
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• 1995

• Information and Communications Magazine
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• v.13 no.12
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• pp.149-164
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• 1996

• Korean Journal of Optics and Photonics
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• v.7 no.1
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• pp.60-65
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• 1996

Degradation of the optical communication system due to the stimulated Brillouin scattering effect in the optical fiber is measured, and its suppression is demonstrated. In the externally modulated 2.5 Gb/s transmission experiment, bit error rate is increased due to the stimulated Brillouin scattering effect when the signal power (linewidth 3 MHz) incident into the dispersion shifted fiber is larger than 10 dBm. SBS effect is suppressed completely, up to 15 dBm of transmission power, by broadening the source linewidth to 200 MHz.

• The Journal of Engineering Research
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• v.2 no.1
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• pp.103-111
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• 1997

EDFA (Erbium Doped Fiber Amplifier) is widely used to compensate the loss in fiber optic transmission system. The characteristics of EDFA are investigated by analyzing the mechanism amplifying the optical power of an input with several factors to obtain the criteria for designing EDFA. When it is used in fiber optic transmission system, signal to noise characteristics in the receiver is deteriorated due to the spontaneous emission noise of EDFA. We investigate the operating conditions of EDFA to reduce BER (Bit Error Rate).