Design And Experimental Research Of Optical Arbitrary Waveform Generater Based On Fiber Bragg Grating

Optical arbitrary waveform generation (OAWG) is a technology that implements thepulse shaping by adjusting the tunable variables of the ultrashort pulse. It eliminates theelectronic bottlenecks at speed. O-AWG has good future prospects in applications in extensivefields, such as control of quantum dynamics, massively parallel readout, arbitrary microwavewaveform generation, dispersion compensation, pattern generation, format conversion in fibercommunication, etc. At present, extensive researches on the real high speed OAWG in theworldwide laboratories are undertaken.The main work in this thesis includes the following parts:(1) The principle of line-by-line pulse shaping OAWG and that of fiber Bragg grating (FBG)and fiber stretcher (FS) based on piezoelectric transducer (PZT) are demonstrated. An opticalarbitrary waveform generator based on two fiber Bragg grating arrays with independentphases control is designed. Based on this structure, we realize the generation of raised cosineroll-off pulse, Gaussian pulse, etc, the repetition frequency multiplication of the input Gaussianpulse by using Matlab. Then we analyze how the non-ideal adjusting of the FS in theamplitude controller and the phase controller affects the quality output waveform.(2) Taking the structure we proposed as an example, the applications of line-by-line pulseshaping OAWG in pattern generation and format conversion are studied. We realize thegeneration of NRZ-OOK pattern and NRZ-DPSK pattern, the format conversion fromNRZ-DPSK to MD-RZ and from RZ to NRZ using Matlab.(3) The amplitude control and phase control of the OAWG based on single FBG array areverified experimentally. The phase control experiment using FS based on PZT verified that bychanging the voltage applied to the PZT resulted in the phase shift of the light passed throughthe fiber twine around the PZT, namely it can realize the phase control of the spectrum. Theamplitude control experiment based on the FBG array verified that adjusting the polarizationcontrollers in the FBG array resulted in change of the power of the spectrum selected by theFBGs, namely it can realize the amplitude control.