The Phase Locking Technology Of Optical And The Application

Photonic information technology can generate and control the signal in the optical domain,and the phase locking technology of the optical is the critical technology. In order to realize photonic signal processing and control, the phase locking technology of optical is attracting more and more attentions of people. Traditional phase-locked loop technology, mode-locked cavity and injection locking technology are not all-optical method to realize optical phase locking, therefore it would be difficult to meet the future of ultra-high speed, large bandwidth communication system.In this paper, we use the all-optical method to realize optical phase locking:1. Analysis of the development of optical fiber communication and the technology of optical phase locking. Analysis of phase-locked loop technology, mode-locked cavity and injection locking technology. The theoretical analysis of the mode-locked cavity technology and semiconductor injection locking. In addition, the modulation characteristics of the Mach-Zehnder electro-optic modulator, principles of rational harmonic mode locking and the oscillation characteristics of the optoelectronic oscillator are discussed in detail.2. Optical fiber phase locking cavity model experiment is proposed. Rational harmonic mode locking is used to realize the phase locking. The activity mode-locked ring laser and F-P laser are achieved by changing the position of electro-optical modulator, respectively. The experiment is focused on researching the results of rational harmonic mode-locked between these two constructions. The pulse in the cavity would pass through the modulator twice, so it would be modulated twice with different degree. The mode-locked F-P fiber laser keeps the advantage which the output wavelength of conventional mode-locked laser is continuous and tunable,equalize the pulse amplitude and generate mode-locked pulse with higher frequency. In the experiment, the highest order obtained is up to 6.3. A coupled optoelectronic oscillator is proposed to achieve phase locking of the optical field. In this scheme, a F-P cavity fiber laser and an optical-electrical feedback branch are coupled together to construct an optoelectronic oscillator to complete an optoelectronic oscillator, part of optical signal outputs from the F-P cavity to implement feedback modulation, which contributes the thirdcavity. The dual-loop and three-cavity OEO are achieved by changing the position of electro-optical modulator, respectively. In the experiment demonstration, a 20-GHz single longitudinal mode microwave signal is successfully obtained.4. We propose and demonstrate using OEO to realize phase locking by injection locking semiconductor lasers. In our configuration, a DFB laser is placed in the fiber loop, which is able to lock one oscillation mode and generate a beat signal with optical carrier on a photo detector(PD). A single loop OEO system is demonstrated, which can generate microwave signal from 18 GHz-22 GHz.