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Experimental Research On Optical Frequency Comb Based OFDM Multiplexed Optical Fiber Transmission System

Posted on:2019-07-08Degree:MasterType:Thesis
Country:ChinaCandidate:Z J ZhangFull Text:PDF
GTID:2348330569487652Subject:Communication and Information System
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The rapid development of the mobile-end mobile phone traffic business and people's explosive demand for internet broadband applications have made the large-capacity long-distance optical backbone network transmission system increasingly a research hotpot in the field of optical fiber communications.Optical frequency combs inherently consist of many equal-distance spectral lines with constant mode spacing and ultra-low phase noise,which can be used as an ideal light source for DWDM high-capacity fiber-optical transmission.DWDM can Increase the transmission capacity of a single optical fiber and fully tap the optical fiber bandwidth.Coherent Optical Orthogonal Frequency Division Multiplexing(Cohere nt Optical OFDM)technology converts high-speed serial data streams into a series of low-speed,orthogonal data streams.Coherent Optical OFDM has advantanges such as high receiver sensitivity,high spectral efficiency,robust tolerance against fiber dispersion,low signal processing.Based on the in-depth understanding of the key technologies of CO-OFDM,this thesis studies the application of optical frequency combs in high-capacity fiber-optical transmission based on conventional electro-optic(EO)modulators and micro-ring resonators.1.This thesis describes the development and advantages of OFDM technology,and introduces the research status of Tb/s ultra-high capacity fiber-optical transmission based on optical frequency combs in the world.Then this thesis summaries some of the recent high speed optical transmission exploring chip-scale integratable frequency comb sources.2.We describe the principles and techniques of CO-OFDM system.In addition,We introduce the system's transmitter and receiver modules in detail.We theoretical analysis digital signal processing techniques such as phase noise compensation and frequency offset compensation by inserting pilot subcarriers.Experiments were conducted to test the relationship between OSNR and BER for a 100 km transmission of 68Gb/s 16 QAM OFDM,and the experimental penalty of the laboratory optical fiber transmission system compared with the theoretical curve was obtained.3.We introduce the structure and working principle of phase modulator and intensity modulator,theoretical analysis and experimental verification of multi-carrier generation based on sinusoidal RF signals driving a single PM and IM,respectively.We uses a single IM to generate multi-carrier,which transmit 233Gb/s 16 QAM OFDM for 100 km.After 100 km transmission,the lowest BER for each channel is below the 7% EFC decoding threshold.This implementation scheme is simple and has lower cost advantage.4.We introduced and explored the mechanism of generating optical frequency combs based on micro-ring resonators.We utilize kerr frequency combs to transmitted 36.0 Gb/s QAM-OFDM data over a distance of 100 km.O ur research confirmed the ability of Kerr frequency combs produced in chip-scale microring resonators to support high-bit-rate OFDM transmissions,demonstrating the potential of their applications,such as integrated transmitter devices for long-distance transmission and optical access networks.
Keywords/Search Tags:Optical fiber communication, WDM, CO-OFDM, digital coherent demodulation, optical frequency combs
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