Digital signal processing for fiber-optic communication systems

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dc.contributor.advisor Zhao, Jian en
dc.contributor.advisor Townsend, Paul D. en
dc.contributor.advisor Manning, Robert en Ouyang, Xing 2017-09-15T10:13:49Z 2017-09-15T10:13:49Z 2017 2017
dc.identifier.citation Ouyang, X. 2017. Digital signal processing for fiber-optic communication systems. PhD Thesis, University College Cork. en
dc.identifier.endpage 221 en
dc.description.abstract As the available bandwidth of optical fibers has been almost fully exploited, Digital Signal Processing (DSP) comes to rescue and is a critical technology underpinning the next generation advanced fiber-optic systems. Literally, it contributes two principal enforcements with respect to information communication. One is the implementation of spectrally-efficient modulation schemes, and the other is the guarantee of the recovery of information from the spectrally-efficient optical signals after channel transmission. The dissertation is dedicated to DSP techniques for the advanced fiber-optic systems. It consists of two main research topics. The first topic is about Fast-orthogonal frequency-division multiplexing (OFDM) — a variant OFDM scheme whose subcarrier spacing is half of that of conventional OFDM. The second one is about Fresnel transform with the derivation of an interesting discrete Fresnel transform (DFnT), and the proposal of orthogonal chirp-division multiplexing (OCDM), which is fundamentally underlain by the Fresnel transform. In the first part, equalization and signal recovery problems result from the halved subcarrier spacing in both double-sideband (DSB) and single-sideband (SSB) modulated Fast-OFDM systems are studied, respectively. By exploiting the relation between the multiplexing kernels of Fast-OFDM systems and Fourier transform, equalization algorithms are proposed for respective Fast-OFDM systems for information recovery. Detailed analysis is also provided. With the proposed algorithms, the DSB Fast-OFDM was experimentally implemented by intensity-modulation and direct detection in the conventional 1.55-μm and the emerging 2-μm fiber-optic systems, and the SSB Fast-OFDM was first implemented in coherent fiber-optic system with a spectral efficiency of 6 bit/s/Hz at 36 Gbps, for the first time. In the second part, Fresnel transform from optical Fresnel diffraction is studied. The discrete Fresnel transform (DFnT) is derived, as an interesting transformation that would be potentially useful for DSP. Its properties are proved. One of the attractive properties, the convolution-preservation property states that the DFnT of a circular convolution of two sequences is equal to the DFnT of either one convolving with the other. One application of DFnT is practically utilized in the proposal of OCDM. In the OCDM system, a large number of orthogonal chirped waveforms are multiplexed for high-speed communication, achieving the maximum spectral efficiency of chirp spread spectrum systems, in the same way as OFDM attains the maximum spectral efficiency of frequency-division multiplexing. Owing to the unique time-frequency properties of chirped waveforms, OCDM outperforms OFDM and single-carrier systems, and is more resilient against the noise effect, especially, when time-domain and frequency-domain distortions are severe. Experiments were carried out to validate the feasibility and advantages of the proposed OCDM systems. en
dc.description.sponsorship Science Foundation Ireland (Grant 11/SIRG/I2124) en
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher University College Cork en
dc.rights © 2017, Xing Ouyang. en
dc.rights.uri en
dc.subject Fast-OFDM en
dc.subject Digital signal processing en
dc.subject Fiber-optic communication en
dc.subject Orthogonal chirp division multiplexing en
dc.subject Orthogonal frequency division multiplexing en
dc.subject Discrete cosine transform en
dc.subject Discrete fourier transform en
dc.subject Discrete fresnel transform en
dc.subject Fresnel integral transformation en
dc.subject Talbot effect en
dc.subject Dispersion compensation en
dc.subject Chirp spread spectrum en
dc.subject Nyquist signaling rate en
dc.subject Nyquist waveform en
dc.title Digital signal processing for fiber-optic communication systems en
dc.type Doctoral thesis en
dc.type.qualificationlevel Doctoral en
dc.type.qualificationname PHD (Engineering) en
dc.internal.availability Full text available en No embargo required en
dc.description.version Accepted Version
dc.contributor.funder Science Foundation Ireland en
dc.contributor.funder Seventh Framework Programme en
dc.description.status Not peer reviewed en Electrical and Electronic Engineering en Tyndall National Institute en
dc.check.type No Embargo Required
dc.check.reason No embargo required en
dc.check.opt-out Not applicable en
dc.thesis.opt-out false
dc.check.embargoformat Not applicable en
dc.internal.conferring Autumn 2017 en

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