Research On Optical Arbitrary Waveform Generation Based On Multi-wavelength SFRL And Measurement

Optical arbitrary waveform generator(OAWG), which is a mutifunctional ultrafast modulator, can generate ultrashort optical pulses with arbitrary waveform. OAWG breaks the electronic bottleneck for speed and has important application in many areas, such as laser technology, high speed optical communication and microwave photonics. In this thesis, a novel OWAG scheme based on multi-wavelength semiconductor fiber ring laser(SFRL) is proposed. The theoretical research and performance analysis of this scheme are also carried out.With the rapid development of optical arbitrary waveform generation technology, optical arbitrary waveform measurement(OAWM) with high accuracy is of great importance. Explore the precise device of OAWM, which has the merits of stability, practicality and excellent performance, is extremely urgent. In this paper, a new measurement scheme for optical arbitrary waveforms, using corss phase modulation(XPM) cross correlation frequency resolved optical gating(X-FROG) in a single mode fiber, is also proposed. The accureate measurement of both the amplitude and phase of optical arbitrary waveform are realized. In addition, the working performance of the proposed scheme is also deeply investigated. The main achievements and conclusions are listed as following:(1) The research signification of optical arbitrary waveform generation and measurement are clarified. The research status of optical arbitrary waveform generation and measurement technology are also summarized.(2) A novel optical arbitrary waveform generation scheme based on multi-wavelength SFRL is presented. The theoretical model of the proposed OAWG scheme is established using line-by-line shaping theory based on Fourier transform, combined with the transfer matrix theory and mode coupling theory in single mode fiber. In this model, the material gain spectrum distribution, the vertical distribution of carriers and light field, and amplified spontaneous emission(ASE) distribution in semiconductor optical amplifier(SOA) are taken into consideration.(3) The proposed OAWG scheme based on multi-wavelength SFRL is numerical simulated using the software of Matlab. In the simulation, the periodical Gaussion pulse, periodical triangular pulse, and periodical optical arbitrary waveform are generated. The impacts of intensity control, phase control, number of spectrum lines, line spacing, and injection current of SOA are simulated and invesgated.(4) A new scheme for optical arbitrary waveform measurement using XPM typed X-FROG in a single mode fiber is proposed. By using the stress birefringence and XPM effect in a single mode fiber, combining with principal component generalized projects(PCGP) algorithm based on matrix, the theory model of the scheme is established.(5) By using the software of Matlab, the proposed optical arbitrary waveform measurement scheme using XPM typed X-FROG in a single mode fiber is simulated and investigated. In the numerical simulation, the measurement of intensity and phase of optical arbitrary waveform are both realized. For instance, the impact of fiber length, shape of the gate pulse and optical arbitrary waveform and the complexity of the optical arbitrary waveform on the accuracy of retrieved amplitude and phase are investigated.