• Title/Summary/Keyword: 40Gb/s

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A 40 Gb/s Clock and Data Recovery Module with Improved Phase-Locked Loop Circuits

  • Park, Hyun;Kim, Kang-Wook;Lim, Sang-Kyu;Ko, Je-Soo
    • ETRI Journal
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    • v.30 no.2
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    • pp.275-281
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    • 2008
  • A 40 Gb/s clock and data recovery (CDR) module for a fiber-optic receiver with improved phase-locked loop (PLL) circuits has been successfully implemented. The PLL of the CDR module employs an improved D-type flip-flop frequency acquisition circuit, which helps to stabilize the CDR performance, to obtain faster frequency acquisition, and to reduce the time of recovering the lock state in the event of losing the lock state. The measured RMS jitter of the clock signal recovered from 40 Gb/s pseudo-random binary sequence ($2^{31}-1$) data by the improved PLL clock recovery module is 210 fs. The CDR module also integrates a 40 Gb/s D-FF decision circuit, demonstrating that it can produce clean retimed data using the recovered clock.

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고속 인터페이스 기술과 표준화 동향

  • 정태식;주범순;정해원
    • The Magazine of the IEIE
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    • v.31 no.8
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    • pp.73-82
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    • 2004
  • SONET/SDH 전송망에서의 데이터 전송율은 10Gb/s급인 OC-192에서 40Gb/s급인 OC-768 로 발전하였으며, 이더넷 (Ethernet)에서의 데이터 전송율은 1998년 1기가비트 이더넷 기술이 표준화된데 이어 2002년에 10기가비트 이더넷기술의 표준화가 완료되었고 조만간 후속 기술로서 40Gb/s또는 100Gb/s급의 이더넷에 대한 논의가 대두될 것으로 예측된다.(중략)

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Fabrication of Transimpedance Amplifier Module and Post-Amplifier Module for 40 Gb/s Optical Communication Systems

  • Lee, Jong-Min;Min, Byoung-Gue;Kim, Seong-Il;Lee, Kyung-Ho;Kim, Hae-Cheon
    • ETRI Journal
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    • v.31 no.6
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    • pp.749-754
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    • 2009
  • The design and performance of an InGaAs/InP transimpedance amplifier and post amplifier for 40 Gb/s receiver applications are presented. We fabricated the 40 Gb/s transimpedance amplifier and post amplifier using InGaAs/InP heterojunction bipolar transistor (HBT) technology. The developed InGaAs/InP HBTs show a cut-off frequency ($f_T$) of 129 GHz and a maximum oscillation frequency ($f_{max}$) of 175 GHz. The developed transimpedance amplifier provides a bandwidth of 33.5 GHz and a gain of 40.1 $dB{\Omega}$. A 40 Gb/s data clean eye with 146 mV amplitude of the transimpedance amplifier module is achieved. The fabricated post amplifier demonstrates a very wide bandwidth of 36 GHz and a gain of 20.2 dB. The post-amplifier module was fabricated using a Teflon PCB substrate and shows a good eye opening and an output voltage swing above 520 mV.

Design and Implementation of a 40 Gb/s Clock Recovery Module Using a Phase-Locked Loop with the Clock-Hold Function (클락 유지 기능을 가지는 위상 고정 루프를 사용한 40 Gb/s 클락 복원 모듈 설계 및 구현)

  • Park Hyun;Woo Dong-Sik;Kim Jin-Jung;Lim Sang-Kyu;Kim Kang-Wook
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.17 no.2 s.105
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    • pp.171-177
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    • 2006
  • A low-cost, high-performance 40 Gb/s clock recovery module using a phase-locked loop(PLL) for a 40 Gb/s optical receiver with the clock-hold function has been designed and implemented. It consists of a clock extractor circuit, an RF mixer and a frequency discriminator for phase/frequency detection, a VC-DRO, a phase shifter, and a clock-hold circuit. The extracted 40 GHz clock is synchronized with a stable 10 GHz VC-DRO. The clock stability and jitter characteristics of the implemented PLL-based clock recovery module are significantly improved as compared with those of the conventional open-loop type clock recovery module with a DR filter. The measured peak-to-peak RMS jitter is about 230 fs. When an input signal is dropped, the 40 GHz clock is maintained continuously by the hold circuit.

16×2.5 Gb/s WDM transmission over 10,880 km using forward error correction (40 Gb/s (16×2.5 Gb/s WDM 신호의 10,880 km 전송실험)

  • 정윤철;전상배;정환석;윤천주;박근주
    • Korean Journal of Optics and Photonics
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    • v.13 no.2
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    • pp.113-116
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    • 2002
  • We demonstrate 16 ch.$\times$2.5 Gb/s WDM transmission over 10,880 km using a re-circulating loop and forward error correction (FEC) code. The performances of all 16 channels were measured to be lower than 10$^{-10}$ .

Characteristics for 40Gb/s EAM Optical Transmitter (40Gb/s EAM 광송신기 특성)

  • 방준학;이정찬;조현우;고제수
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2002.11a
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    • pp.817-820
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    • 2002
  • In this letter, we developed a 400Gb/s optical transmitter using an electroabsorption modulator and measured its characteristics. As a result, the extinction ratio, the output power and the wavelength are varied while DC bias voltage and temperature of an electroabsorption modulator are changed. Based upon these experimental results, a design of 400Gb/s optical transmitter can be optimized.

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A Cost-Effective 40-Gb/s ROSA Module Employing Compact TO-CAN Package

  • Kang, Sae-Kyoung;Lee, Joon Ki;Huh, Joon Young;Lee, Jyung Chan;Kim, Kwangjoon;Lee, Jonghyun
    • ETRI Journal
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    • v.35 no.1
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    • pp.1-6
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    • 2013
  • In this paper, we present an implemented serial 40-Gb/s receiver optical subassembly (ROSA) module by employing a proposed TO-CAN package and flexible printed circuit board (FPCB). The TO-CAN package employs an L-shaped metal support to provide a straight line signal path between the TO-CAN package and the FPCB. In addition, the FPCB incorporates a signal line with an open stub to alleviate signal distortion owing to an impedance mismatch generated from the soldering pad attached to the main circuit board. The receiver sensitivity of the ROSA module measures below -9 dBm for 40 Gb/s at an extinction ratio of 7 dB and a bit error rate of $10^{-12}$.

40 Gb/s Traveling-Wave Electroabsorption Modulator-Integrated DFB Lasers Fabricated Using Selective Area Growth

  • Kwon, Yong-Hwan;Choe, Joong-Seon;Sim, Jae-Sik;Kim, Sung-Bock;Yun, Ho-Gyeong;Choi, Kwang-Seong;Choi, Byung-Seok;Nam, Eun-Soo
    • ETRI Journal
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    • v.31 no.6
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    • pp.765-769
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    • 2009
  • In this paper, we present the fabrication of 40 Gb/s traveling-wave electroabsorption modulator-integrated laser (TW-EML) modules. A selective area growth method is first employed in 40 Gb/s EML fabrication to simultaneously provide active layers for lasers and modulators. The 3 dB bandwidth of a TW-EML module is measured to be 34 GHz, which is wider than that of a lumped EML module. The 40 Gb/s non-return-to-zero eye diagram shows clear openings with an average output power of +0.5 dBm.

The effect of fiber chromatic dispersion on 40-Gb/s optical transmission using very short pulses (매우 짬은 펄스를 사용한 400b1s 광전송의 성능과 광섬유의 색분산과의 상관관계)

  • 박상규
    • Proceedings of the Optical Society of Korea Conference
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    • 2001.02a
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    • pp.176-177
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    • 2001
  • 최근에 매우 짧은 펄스를 이용한 RZ 포맷의 고속 광전송이 소개되었다. 컴퓨터 시뮬레이션을 통하여 이 포맷이 40Gb/s 전송에 유효하다는 것이 보여졌으며, 또한 실험을 통하여 이 포맷이 광섬유에서의 SPM에 저항성을 갖는다는 것of 보여졌다. 이 후 몇 편의 논문을 통하여 160Gb/s,300km(3$\times$100km)전송, 40Gb/s, 720km(6$\times$120km)전송 등이 보고되었다. 이 새로운 포맷에서는 짧은 펄스를 사용하므로 광신호가 고유의 정보량이 요구하는 최소한의 것보다 넓은 대역폭을 차지하게 되며 이는 광섬유의 분산과 상호작용을 하여 광전송중 광섬유의 비선형성에 의한 신호의 왜곡을 줄이는 역할을 하게 된다. (중략)

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Transmission of 200-Gb/s 2-channel OTDM-PAM4 Signal Based on CSRZ Pulse Generated by Mach-Zehnder Modulator (마하 젠더 변조기로 생성된 CSRZ 펄스 기반의 200 Gb/s OTDM-PAM4 신호의 전송)

  • Sunghyun Bae
    • Korean Journal of Optics and Photonics
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    • v.34 no.4
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    • pp.151-156
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    • 2023
  • We propose to implement cost-effectively a high-speed short-haul interconnect by transmitting a 200-Gb/s/λ two-channel optical time-division-multiplexed signal generated by a carrier-suppressed optical pulse, which improves the robustness of the multiplexed signal to chromatic dispersion. The multiplexed 200-Gb/s signal is generated in the transmitter by combining two 100-Gb/s 4-level pulse-amplitude-modulated signals (generated using the optical pulse and two Mach-Zehnder modulators). After the signal is transmitted over a fiber, it is amplified by a semiconductor optical amplifier and detected by a photodiode. The amplified spontaneous emission noise is eliminated by an optical band-pass filter. The transmitted signal is reconstructed by a 2 × 2 multiple-input multiple-output equalizer, which compensates for crosstalk. Due to the use of the carrier-suppressed optical pulse, the 200-Gb/s signal can be transmitted over fiber with a chromatic dispersion of 40 ps/nm.