Research On All-optical Wavelength Conversion Based On TLD And Key Techniques Of UDWDM-PON

At present,China's optical communication network has two problems.One is that the demand for transmission capacity is further improved and the switching in the network is a bottleneck to improve the transmission capacity,the other is that the high density population structure is brought by urbanization and the large-scale access in small area has become a problem to be solved urgently.Aiming at the problem of switching,all optical packet switching can solve the limitation of the rate and energy consumption in traditional optical-electric-optical packet switching.Based on tunable laser?TLD?,all-optical wavelength switching is the key technology.In view of the problem of access,the ultra dense wavelength division multiplexing-passive optical network?UDWDM-PON?technology can achieve large area access.All-optical wavelength conversion based on TLD and the key technology of UDWDM-PON are the main contents of this work.A novel TLD scheme based on the vernier effect is proposed,and the design and fabrication of the driving circuit of TLD are completed.The static and dynamic characteristics of the laser are studied.18 sets of wavelengths which satisfy the ITU gird standard are obtained.The tuning range is from 1535.2 to 1548.7nm and the tuning time is below 100ns.On this basis,all-optical wavelength conversion experiment is realized by using the cross-gain modulation?XGM?of semiconductor optical amplifier?SOA?.When the power is greater than-22dBm,the bit error rate of each wavelength is less than 10^-11.The key technology of UDWDM-PON is studied,and the method of full network wavelength synchronization is proposed to ensure the stability of channel interval.The generation,allocation and tracking of wavelength reference is the key technology of wavelength synchronization in the whole network.The supercontinuum is injected into the DFB laser to achieve the generation and assignment of wavelength reference,and the wavelength tracking is realized by automatic wavelength tracking technology.An automatic wavelength tracking experiment with active filter is carried out,and the automatic wavelength tracking time is about 100s.