• The Journal of Korean Institute of Communications and Information Sciences
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• v.38B no.6
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• pp.427-434
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• 2013

In this paper, the design and layout of a 2.5 Gbps arrayed VCSEL driver for optical transceiver having arrayed multi-channel of integrating module is confirmed. In this paper, a 4 channel 2.5 Gbps VCSEL (vertical cavity surface emitting laser) driver array with automatic optical power control is implemented using $0.18{\mu}m$ CMOS process technology that drives a $1550{\mu}m$ high speed VCSEL used in optical transceiver. To enhance the bandwidth of the optical transmitter, active feedback amplifier with negative capacitance compensation is exploited. We report a distinct improvement in bandwidth, voltage gain and operation stability at 2.5Gbps data rate in comparison with existing topology. The 4-CH chip consumes only 140 mW of DC power at a single 1.8V supply under the maximum modulation and bias currents, and occupies the die area of $850{\mu}m{\times}1,690{\mu}m$ excluding bonding pads.

• Journal of the Institute of Electronics Engineers of Korea SD
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• v.42 no.3 s.333
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• pp.25-34
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• 2005

In this paper, we analyzed and measured the electrical crosstalk characteristics of a triplex transceiver module for ethernet Passive optical networks(EPONS). And we improved the electrical crosstalk levels using Dummy ground lines with signal lines. The triplex transceiver module consists of a laser diode as a transmitter, a digital photodetector as a digital data receiver, and a analog photodetector as a community antenna television signal receiver. And there are integrated on silicon substrate. The digital receiver and analog receiver sensitivity have to meet -24 dBm at $BER=10^{-l2}$ and -7.7 dBm at 44 dB SNR. And the electrical crosstalk levels have to maintain less than -86 dB from DC to 3 GHz. From analysis and measurement results, the proposed silicon substrate structure that contains the Dummy ground line with $100\;{\mu}m$ space from signal lines and separates 4 mm among devices respectively, is satisfied the electrical crosstalk level compared to simple structure. This proposed structure can be easily implemented with design convenience and greatly reduced the silicon substrate size about $50\%$.

• Proceedings of the Materials Research Society of Korea Conference
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• 1998.08a
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• pp.99.2-99
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• 1998

• Journal of the Institute of Electronics Engineers of Korea SD
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• v.43 no.5 s.347
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• pp.48-53
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• 2006

This paper describes the electrical characteristics of monolithic optical transceiver circuitry being used in the fiber optic modules. It has been designed and fabricated, and compared with two chips version transceiver when operates at 155.52 Mbps data rates. To avoid noise and interference between transmitter and receiver on one chip, layout techniques such as special placement, power supply separation, guard ring, and protection wall were used in the design. To compare the two kind of fiber optic modules using each chip, single chip version has similar properties to two chip version in the electrical characteristics as noise and others.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.17 no.4
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• pp.8-12
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• 2003

Characteristics of optical transceiver module in radio frequency(RF) band were investigated with TO-can packaged Fabry-Perot laser diode(FP-LD). R-L-C parameters for equivalent circuit model of the LD were extracted with an impedance analyzer. With this model, impedance matching to the packaged LD could be performed by eliminating inductive components of the leads in the package by using lumped chip capacitors that have opposite reactance, while it shows resonance dip in low frequency band. The resonance dip could be removed using lumped elements for impedance matching by shifting the resonance frequency to the region out of interest.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.28 no.5A
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• pp.323-332
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• 2003

We have proposed and implemented a novel cost-effective optical subcarrier mutiplexing transceiver for base station without light sources in which optical signal can be transmitted bidirectionally over a single optical fiber. Modulated optical signal is retransmitted from the base station to the central office using a ring-type base station which consists of a circulator and an Mach-Zehnder modulator, where the optical source is supplied from the central office. In order to investigate the feasibility of the proposed base station without light sources, we have measured adjacent channel power ratio and carrier to noise ratio by transmitting the IS-95 CDMA signal and 14 tones carrier signal bidirectionally through the system.

• 한국정보통신설비학회:학술대회논문집
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• 2003.08a
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• pp.177-179
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• 2003

본 논문에서는 $0.35{\mu}m$ CMOS 공정을 이용하여 2.5 Gbps로 동작하는 광 송수신기를 설계하였다. 광 송수신기의 구성을 보자면, 전기 신호를 빛 신호로 전환하여 주는 레이저 다이오드(LD) 구동부와 레이저 다이오드에서 나오는 빛 신호를 수신하여 이를 다시 전기 신호로 바꿔주는 포토 다이오드(PD) 구동 부분으로 구성된다. LD 구동부는 LD의 문턱전류 이상을 공급하는 바이어스 부분과 신호레벨의 모듈레이션 전류를 공급하는 부분으로 구성된다. 디자인된 송신기는 바이어스 전류를 10 mA 정도 공급하여주며, 모듈레이션 전류를 15 mA 정도 공급한다. 수신기는 current decision 부분과 output buffer 부분으로 구성되어 PD로부터 나오는 전류를 다시 디지털 레벨의 전압신호로 바꾸어 주며 디자인된 수신기는 넓은 동작 영역을 가진다.

• Proceedings of the IEEK Conference
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• 2006.06a
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• pp.73-74
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• 2006

In this paper, we designed, constructed and evaluated the system for the FTTH suited to a residence and apartment using CWDM-PON techniques. These systems have capacity to service at 100Mbps rate to 384 users in the same breath. Also, the services include the internet, CATV, IPTV and wireless LAN. In the case of wire network, the data could be transmitted by UTP cable and optical fiber and case of wireless one, the data transmitted using WLAN. The distance between the cental office and the user is 20km and the data rate is 100Mbps maximum. Of course, the optical network used just one fiber optical core. For the basic material, we obtained the characteristics of optical transceiver module, Mux/Demux and transmission qualities depends on the environment.

• Journal of the Optical Society of Korea
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• v.12 no.1
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• pp.49-51
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• 2008

The wide-band spiral inductor to be monolithically integrated on the AlN substrate as a choking inductor for a compact 10 Gb/s optical transmitter applications is investigated. In order to reduce the parasitic capacitance limiting the choking bandwidth, the AlN substrate is partially etched away, which is analyzed by using an equivalent circuit model. The measured $S_{21}$ transmission response of the fabricated inductor is suppressed as low as -10 dB in the frequency range of 5 to 16 GHz.

• The Magazine of the IEIE
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• v.42 no.3
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• pp.65-70
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• 2015

최근 유무선 데이터 트래픽 증가에 따른 추가 설비 비용 등의 증대는 수익성이 정체된 통신 산업체에 부담을 가중시키고 있다. 폭증하는 신규 서비스 대응과 산업체의 수익성을 동시에 확보하기 위해서 기존 망자원의 효율화 증대 및 고성능화하기 위한 방안으로 Optical SDN 시스템 및 부품 기술경쟁이 심화되고 있다. 본고에서는 이러한 요구 사항을 해결하고 국내 광네트워크 산업의 재도약을 위한 광부품 기술개발로써, 미래부 주관 차세 대통신 네트워크 산업 원천기술개발 사업인 'Optical SDN 구현을 위한 Metro용 Port-agnostic 광송수신 기술 개발'에 대한 기술을 소개하고 과제의 주요 연구 목표 및 내용인 100G coherent 광송수신 기술, 핵심 요소 부품기술에 대하여 소개함으로써, 향후 과제에서 개발 진행 중인 기술과 연계된 국내 광부품 산업체들이 고려해야할 주요 글로벌 기술 이슈 사항들과 본 과제에서 중점적으로 수행중인 내용을 간략히 소개하고자 한다.