Journal ArticleDOI
Optimum Design for RF-to-Optical Up-Converter in Coherent Optical OFDM Systems
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In this paper, the authors derived closed-form expressions for the nonlinearity in the optical I/Q modulator, represented by two-tone intermodulation products as a function of the bias point and modulation index.Abstract:
In this letter, we conduct analysis on the optimum design for RF-to-optical up-converter in coherent optical OFDM systems using an optical I/Q modulator. We first derive closed-form expressions for the nonlinearity in the optical I/Q modulator, represented by two-tone intermodulation products as a function of the bias point and modulation index. Additionally, we perform a numerical simulation to identify Q-penalty and the excess modulation insertion loss under various transmitter conditions. We find that in contrast to the direct-detected system, the optimal modulator bias point for the coherent system is pi, where the Q-penalty and excess loss are minimizedread more
Citations
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Journal ArticleDOI
Coherent optical OFDM: theory and design.
TL;DR: The receiver-based digital signal processing to mitigate self-phase-modulation (SPM) and Gordon-Mollenauer phase noise, which is equivalent to the midspan phase conjugation is shown.
Journal ArticleDOI
Coherent Optical 25.8-Gb/s OFDM Transmission Over 4160-km SSMF
TL;DR: In this paper, the authors discuss coherent optical orthogonal frequency division multiplexing (CO-OFDM) as a suitable modulation technique for long-haul transmission systems and especially focus on phase noise compensation.
Journal ArticleDOI
107 Gb/s coherent optical OFDM transmission over 1000-km SSMF fiber using orthogonal band multiplexing
William Shieh,Qi Yang,Yiran Ma +2 more
TL;DR: The first experimental demonstration of 107 Gb/s QPSK-encoded CO-OFDM signal transmission over 1000 km standard-single- mode-fiber (SSMF) without optical dispersion compensation and without Raman amplification is presented.
Journal ArticleDOI
Coherent optical OFDM: has its time come? [Invited]
TL;DR: In this article, a 2×2 multiple-input-multiple-output (MIMO) OFDM representation for the single-mode fiber optical channel is presented and discussed.
Journal ArticleDOI
Theoretical and experimental study on PMD-supported transmission using polarization diversity in coherent optical OFDM systems.
TL;DR: It is shown that the optical fiber channel model can be treated as a special kind of multiple-input multiple- output (MIMO) model, namely, a two-input two-output (TITO) models which is intrinsically represented by a two -element Jones vector familiar to the optical communications community.
References
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Journal ArticleDOI
Coherent optical orthogonal frequency division multiplexing
William Shieh,C.R.N. Athaudage +1 more
TL;DR: In this article, a coherent optical orthogonal frequency division multiplexing (OFDM) was proposed to combat dispersion in optical media, and it was shown that optical-signal-to-noise ratio penalty at 10 Gbit/s is maintained below 2 dB for 3000 km transmission of standard-singlemode fiber without dispersion compensation.
Book
Multicarrier techniques for 4G mobile communications
Shinsuke Hara,Ramjee Prasad +1 more
TL;DR: In this article, the authors provide a comprehensive introduction to multicarrier techniques for 4G mobile communications with a special focus on the analytical aspects, explaining radio channel characteristics and phenomena and discussing the advantages and disadvantages of the OFDM scheme; featuring new multic-rier-related techniques, MC-CDMA, research on several 4G systems, and a look at several problems to be overcome with these systems.
Journal ArticleDOI
Intermodulation distortion and compression in an integrated electrooptic modulator.
Brian H. Kolner,David W. Dolfi +1 more
TL;DR: The intermodulation distortion and compression properties of an integrated optical modulator at microwave frequencies are characterized by measuring the third-order intercept and 1-dB compression points.
Journal ArticleDOI
Polarisation mode dispersion mitigation in coherent optical orthogonal frequency division multiplexed systems
TL;DR: In this paper, the authors proposed a coherent optical orthogonal frequency division multiplexing (CO-OFDM) to mitigate polarisation mode dispersion (PMD) in optical media.
Journal ArticleDOI
Method for measuring the rf modulation characteristics of Mach-Zehnder-type modulators
F. Auracher,R. Keil +1 more
TL;DR: In this article, the frequency spectrum of the light output from a Mach-Zehnder-type waveguide modulator was derived from the measurement of the spectrum and the rf modulation characteristics can be deduced.