• Title/Summary/Keyword: Mach-Zehnder modulator

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Fabrication of Mach-Zehnder Interferometric Modulator Using Proton-Diffused Channel Waveguide (양자확산 LiNbO$_3$ 광도파로를 이용한 Mach-Zehnder 간섭계 구조의 광변조기 제작)

  • 김종성
    • Proceedings of the Optical Society of Korea Conference
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    • 1990.02a
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    • pp.264-268
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    • 1990
  • A guided-wave electro-optic Mach-Zehnder interferometric modulator was fabricated on X-cut LiNbO3 . The channel waveguides were formed by proton diffusion with self-aligned SiO2-cladding. A mach-Zehnder interferometric modulator with arm lengths of 7mm has been fabricated and tested at 0.6328${\mu}{\textrm}{m}$. Its modulation depth with V$\pi$ of only 3.5V was 85% and the 3dB bandwidth was 1.6KHz. For high speed operation, the electrode dimension should be reduced to have smaller R, L, and C.

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Study on the Design of Mach-Zehnder Type GaAs Waveguide Electro-Optic Modulator (Mach-Zehnder 형 GaAs 광도파로 변조기의 설계 연구)

  • 이종진;김현배;박정호;박진우
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.17 no.5
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    • pp.442-451
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    • 1992
  • Mach-Zehnder type GaAs elcetro-optic waveguide modulator has been designed in this paper.The modulator. Considered is based on the Mach-Zehnder interferometer configuration, consisting of two Y branch couping rib type waveguides formed in two epitaxial layers on GaAs substrate. The mode theory on waveguides and electo-optic effect of GaAs were utilized to determine the design parameters for the modulator proposed. Effective index method was applied to design the of waveguide supporting a single mode were calculated to achieve the optimized operation of the modulator. Considering interrelationships between many parameters.

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Development of 5Gbps Ti:LiNbO$_3$ Mach-Zehnder Interferometric Optical Modulator for High-speed Optical Communications (초고속 광통신용 5Gbps 급 Ti:LiNbO$_3$ Mach-Zehnder interferometric 광변조기 개발)

  • 김성구;윤형도;윤대원;유용택
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 1997.11a
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    • pp.477-479
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    • 1997
  • The preparation of mach-zehnder inteferometric optical modulator and the properties of electrode and modulation bandwidth for high speed optical communications were described. The results of fabricated optical modulator was that optical 3-dB bandwidth 4.7GHz, driving voltage 6V and fiber-waveguide-fiber insertion loss 4.5dB for TM mode respectively.

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Dispersion Tolerance for Optical Duobinary Transmitters based on a Mach-Zehnder Modulator and an Optical Filter (마크-젠더 변조기와 광 필터를 사용한 광 듀오바이너리 송신기의 분산 내성에 관한 연구)

  • Lee, Dong-Soo
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.11 no.4
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    • pp.141-145
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    • 2011
  • We theoretically investigated dispersion tolerance of an optical duobinary transmitter employed a Mach-Zehnder modulator and an optical filter. Compared to the optical transmitter based on a Mach-Zehnder modulator and an optical delay interferometer by optimizing the applied voltage for improving the dispersion tolerance, the demonstrated duobinary transmitter provides improved receiver sensitivity and higher dispersion tolerance while maintaining narrow spectral bandwidth.

A Frequency-Doubling Optoelectronic Oscillator using a Three-Arm Dual-Output Mach-Zehnder Modulator

  • Chong, Yuhua;Yang, Chun;Li, Xianghua;Ye, Quanyi
    • Journal of the Optical Society of Korea
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    • v.17 no.6
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    • pp.491-493
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    • 2013
  • This paper proposes a frequency-doubling optoelectronic oscillator employing a novel three-arm dual-output Mach-Zehnder modulator (MZM). One output of the MZM generates the fundamental-frequency signal which is recycled by the microwave optical fiber link for oscillation, and the other output can generate the frequency-doubled signal. Experiment was conducted using a commercial two-arm MZM, a phase modulator, and an optical fiber link of 89 meters in length. A 19-GHz frequency-doubled signal was successively obtained with fundamental signal suppression more than 36 dB.

Variable and Flexible Optical Frequency Comb Source using Dual Mach Zehnder Modulator and Phase Modulator

  • Naveed, Abbas;Choi, Bong-Soo;Tran, ThanhTuan;Seo, Dongsun
    • Journal of IKEEE
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    • v.20 no.4
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    • pp.385-391
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    • 2016
  • We demonstrated experimentally a variable optical frequency comb source using a cascaded dual parallel Mach Zehnder modulator (DPMZM) and a phase modulator (PM). With this simple configuration and applying low drive voltages, we generated variable comb source composed of spectral lines 3, 5, 7, 9 and 11 with 10-GHz frequency spacing, also generated 2 and 3 spectral lines with 20 GHz frequency spacing. The generated comb source maintains high spectral coherence across the entire bandwidth with good spectral flatness (within 1-dB for 2, 3, 5, 7 comb lines, within 2-dB for 9-comb lines and within 3-dB for 11 comb lines). The flat and variable comb source is mainly achieved by manipulating 6 operating parameters of DPMZM, setting RF amplifier gain, connected at phase modulator and phase shifters. Hence the method is simple and offers great flexibility in achieving flat and variable comb spectrum, which is experimentally demonstrated. This brings advantages of power efficiency due to low driving voltages, simplicity and cost effectiveness to the system.

Fabrication of Y-cut LiNbO$_3$ Mach-Zehnder Interferometric Modulator using Proton Diffusion Process (양자확산 공정을 이용한 Y-cut LiNbO$_3$ 마하젠더 간섭계형 변조기 제작)

  • 이상윤
    • Proceedings of the Optical Society of Korea Conference
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    • 1991.06a
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    • pp.110-114
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    • 1991
  • A guided-wave electrooptic Mach-Zehnder interferometric modulator was fabricated on Y-cut acoustic grade LiNbO3 process. In order to reduce the electrode capacitance, serial capacitance electrode(SCE) structure was adopted. Extinction ratio more than 30dB was obtained with V$\pi$ of 4.69 volt at λ= 0.6328${\mu}{\textrm}{m}$. Frequency response was measured by using the swept frequency technique, and the bandwidth of the modulator was about 1GHz.

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Performance Analysis of DS-CDMA Signal through MZ Modulator in optical SCM Signal Transmission (광 SCM 전송방식에서 MZ 변조기를 통과한 DS-CDMA 신호의 성능분석)

  • 김회준;임명섭
    • Proceedings of the IEEK Conference
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    • 2001.06a
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    • pp.77-80
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    • 2001
  • In this paper, it is analyzed the statistical characteristics on the transmission performance of the optical SCM transmission in the CDMA RF signal relay system. Using Mach-Zehnder modulator, optical signal is regenerated into CDMA RF signal. Transfer function model of mach-Zehnder modulator is approximated to the third power of the input signal using Taylor series. BER results are analyzed under the multiple access interference and multi-path fading environment.

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A Novel Fiber Bragg Grating Sensing Interrogation Method Using Bidirectional Modulation of a Mach-Zehnder Electro-Optical Modulator (Mach-Zehnder 광변조기의 양방향 변조를 이용한 새로운 광섬유격자 센서 검출 방법)

  • Mao, Wankai;Pan, Jae-Kyung
    • Journal of the Institute of Electronics Engineers of Korea SD
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    • v.47 no.7
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    • pp.17-22
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    • 2010
  • We have proposed and experimentally demonstrated a novel fiber Bragg grating (FBG) sensing interrogation method using bidirectional modulation of a Mach-Zehnder electro-optical modulator (MZ-EOM). The proposed structure consists mainly of a broadband light source (BBS), FBG, MZ-EOM, chirped fiber Bragg grating (CFBG), and photodetector (PD). We have obtained the transfer functions of the proposed structure and calculated the time delay from the change in the free spectral range (FSR) for ten wavelengths over the frequency range of 505 MHz to 525 MHz. The results show that the time delay and the wavelength variation have a good linear relationship with a gradient of 12.9 ps/0.2 nm, which can be usefully applied to FBG strain or temperature sensors and other multiplexed sensor applications.

Performance Analysis of Optical Transmitters with the Non-ideal Mach-Zehnder Modulator

  • Lee, Dong-Soo
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.22 no.11
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    • pp.9-14
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    • 2008
  • This paper presents the performance analysis of 10[Gb/s] optical duobinary transmitters with the non-ideal Mach-Zehnder modulator which does not have exactly 50/50 splitting/combining ratios by computer simulations. For driving voltage ratios(=driving voltage/switching voltage) with smaller than 100[%], the transmission performance has been greatly affected by extension of LPF bandwidths. Nevertheless, the performance has been degraded when the driving voltage ratio is 100[%]. The smaller driving voltage ratios has, the more sensitivity improves by extension of LPF bandwidths under the asymmetry condition. But the driving voltage ratio with 80[%] has better bit error rate(BER) than those with 50[%] and 25[%].