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Research On All-Fiber Based Supercontinuum Source For All-Optical Sampling Application

Posted on:2018-08-27Degree:MasterType:Thesis
Country:ChinaCandidate:S N ZhuFull Text:PDF
GTID:2428330566951447Subject:Optical Engineering
Abstract/Summary:PDF Full Text Request
With the rapid capacity increase of fiber optical transmission system,and the wide application of wavelength division multiplexing(WDM)technique,traditional electrical sampling scheme for high-speed optical signal measurement and characterization cannot satisfy the requirement of current high-speed fiber optical transmission system.All-optical sampling technique is transparent for the optical signal bit-rate,thus,it has been received worldwide research attention.As a key module of the all-optical sampling system,optical sampling pulse determines the operation wavelength range and accuracy of optical signal measurements.To explore stable and reliable optical sampling source,which can be used for the measurement of multi-wavelength optical signals,is definitely important.So far,wavelength-tunable mode-locked fiber lasers have been commonly used as optical sampling source to achieve multi-wavelength signal characterization.The disadvantage of this scheme is that the operation wavelength of sampling pulse needs to be finely adjusted.In particular,the wavelength-tunable mode-locked pulse source has limited tuning range and small characterization range.This thesis is focus on the development of all-fiber supercontinuum source for all-optical sampling application.A supercontinuum with repetition rate of 114.213 MHz,and 10-dB spectral bandwidth over 500 nm is generated.The all-fiber supercontinuum is verified by linear optical sampling prototype.The research contents include:(1)According to the requirement of supercontinuum generation,a dissipative soliton passive mode-locked fiber laser is developed.The generation of dissipative soliton is experimentally and numerically investigated.The vector characteristics of the seed pulse are characterized.At the same time,a method to generate chirp-induced high-order soliton pulse shape is put forward.(2)We develop the all-fiber supercontinuum source including four modules of seed source,optical amplification,pulse compression,and supercontinuum generation.The stepwise optimization of supercontinuum source leads to a repetition rate of more than 100 MHz and a 10-dB bandwidth over 500 nm.In addition to satisfy the need of the optical sampling pulsed source,the supercontinuum also has ideal coherence and spectral flatness.(3)Based on the supercontinuum,the 400 Gbps PDM-16 QAM and multi-wavelength 4×128 Gbps PDM-QPSK optical signals are successfully characterized by linear optical sampling technique.We also explain the corresponding digital signal processing algorithms of PDM-16 QAM signal and obtain the constellation information after offline processing.
Keywords/Search Tags:All-optical Sampling, All-fiber Based Supercontinuum Laser, Dissipative soliton fiber laser, Digital signal processing
PDF Full Text Request
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